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A flexible dual-mode dual-port wearable antenna with low-profile and wideband Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-20 Guo-Ping Gao, Zhuo-Qi Yu, Jing-Hang Dong, Bin Hu
A low-profile wideband dual-mode (on-/off-body mode) dual-port wearable antenna with flexible substrate is presented for the 5 GHz wireless body area network (WBAN) communications. Using polydimethylsiloxane (PDMS) and felt as substrate, the proposed antenna has a compact structure and is easy to manufacture. In particular, the on-body mode is realized by the circular patch loaded with a concentric
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Research on temperature uniformity optimization of microwave heating Debye media based on MDADT Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-20 Biao Yang, Qingyun Xiao, Cheng Cheng, Sentao Su
In the microwave heating process, the uneven temperature distribution is not conducive to improving the quality characteristics of the media. This article proposes a model-dependent average dwell time (MDADT) switching control method for the uneven temperature distribution of the Debye medium during microwave heating. First, a mathematical model of microwave heating switching control is established
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Glasses frame-based wearable antenna design for ultrahigh frequency radio frequency identification and Internet of Things applications using characteristic mode analysis Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-20 Maria Hanif, Muhammad Farhan, Abubakar Sharif, Kashif Nisar Paracha, Umer Ijaz
A novel ultra-high frequency (UHF) radio frequency identification (RFID) passive tag antenna based on a glasses frame is proposed for Internet of Things (IoT) applications. The glasses frame structure is exploited using characteristic mode analysis (CMA) to explore different modes for both 900 MHz and 2.4 GHz frequency bands. The proposed design consists of a glasses metallic frame and a loop for conjugate
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Compact dual-band eight-element MIMO antenna for 5G operations in mobile handsets Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-19 Jianlin Huang, Jing Cai, Xiaojing Shi, Bo Chen, Gui Liu
A compact dual-band eight-element antenna working in 3.5 GHz (3.4–3.6 GHz) and 4.9 GHz (4.8–5 GHz) for 5G operations is proposed. Each antenna element consists of a modified rectangular strip monopole. The size of a single antenna element is 10.3 × 7 mm2. By cutting various slots and adding compensatory strips, the presented antenna demonstrates a good performance in both the lower and higher frequency
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Parallel body-shaping of electrically large objects described by NURBS surfaces Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-16 Reza Vahdani, Seyedeh Mahsa Saraee, Vahid Mohtashami
This article presents a systematic procedure to shape the body of an electrically large object in order to achieve a desired radiation/scattering pattern. In particular, the object surface is described by non-uniform rational B-splines (NURBS) and physical optics (PO) is used for electromagnetic field calculations. The NURBS control points and weights are considered as degrees of freedom for an evolutionary
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Interconnect reliability investigation for a high power GaN MMIC PA based on APDL Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-16 Qian Lin, Peng-fei Zhao, Hai-Feng Wu, Si-wei Chen
Based on the finite element analysis and the automatic modeling, the interconnect reliability for GaN monolithic microwave integrated circuit (MMIC) power amplifier (PA) with different transistor sizes, currents, and temperatures have been predicted effectively in this article. The modeling and computation are completed automatically based on the ANSYS Parametric Design Language (APDL) to study the
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Non-invasive breast tumor detection with antipodal Vivaldi antenna using monostatic approach Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-15 Athul O. Asok, Gokul Nath S. J., Sukomal Dey
This work presents a flat-gain antipodal Vivaldi antenna (AVA) for ultra-wideband (UWB) microwave imaging applications. The proposed antenna demonstrates measured and simulated impedance bandwidth from 2.3 GHz to 20 GHz with a flat gain over the band, with minimum gain variation of 2.9 dBi. The antenna is tested initially for its practical utility by measuring its specific absorption rate (SAR) value
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Three-dimensional modified dipole structure with reduced resonant frequency Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-15 MD. Ataur Safi Rahaman Laskar, Khan Masood Parvez
A highly frequency reduction technique for three-dimensional dipole antennas has been presented using linear spiral, modified linear spiral wire-based structure and wheel on either end of dipole arm. The dipole with wheel on either end of dipole arm reduced the resonant frequency by 65.53% compared with the reference frequency at 3.83 GHz. The electrical properties of ka esteem is 0.59, which are less
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Twin nonlinearity generator-based analog predistorter for small-cell power amplifiers Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-15 Gaoming Xu, Li Huang, Taijun Liu, Xiupu Zhang
In this article, a simple analog predistorter (APD), named twin nonlinearity generator based APD (TNG-APD) using the pseudomorphic high electron mobility transistor (pHEMT), is proposed for linearizing small-cell radio frequency power amplifiers (RFPAs) in the fifth-generation mobile communication system (5G). The TNG-APD is composed of two cascaded common-source field effect transistors (FETs) and
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Coplanar waveguide fed ultra-wideband multiple-input multiple-output slot antenna with connected ground and high isolation for internet of things and wireless body area network applications Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-14 Chengzhu Du, Ruohui Wang, Jie Zhang
This paper proposes two flexible ultra-wideband (UWB) multiple-input multiple-output (MIMO) slot antennas with connected ground and high isolation. Two MIMO antennas consist of two parallel slot antenna elements with coplanar waveguide feeds and ground. The antennas are etched on the liquid crystal polymer substrate and have the consistent sizes of 30 × 56 × 0.1 mm3. The first UWB-MIMO antenna can
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Increasing broadband radiation of sub-6 GHz base station antenna based on sector dipole mode optimization Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-13 Sheng-Lin Rao, Qiang-Ming Cai, Runren Zhang, Tang Chen, Mulin Liu, Tao Liu, Xin Cao, Yuying Zhu, Yuyu Zhu, Bo Pu, Jun Fan
A broadband radiation dual-polarized antenna is proposed for the application of 5G sub-6 GHz base stations. The radiator of the antenna is consisted of a pair of crisscrossed sector dipoles, and is fed by microstrip stubs. By etching rectangular slots on the patches, the resonant modes of the antenna can increase to eight. Therefore, the broadband characteristic can be realized by effectively exciting
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Compact frequency reconfigurable MIMO antenna pair with high isolation for 5G mobile applications Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-13 Xing Zhao, Yang Ye, Junyin Wang
This article presents a design of compact frequency reconfigurable dual-port antenna pair with high isolation for 5G mobile devices. Two feeding ports are located side by side and share a common radiator within a small area of 11.5 mm × 6 mm in the proposed antenna pair. The feeding ports achieve a self-decoupling characteristic without any additional decoupling structure based on a synthesis of common
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Design of diplexer with direct synthesis method for ground penetrating radar Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-11 Xinyue Dai, Qian Yang, Wenjing Xu, Cheng Guo, Anxue Zhang
This paper proposes a direct synthesis method for diplexer with wide fractional bandwidth (115.4%) of the second passband and a narrow isolation bandwidth (190 MHz) between the two passbands in the frequency domain and almost no tailings of the output signals in the time domain. This diplexer is designed for pulsed ground penetrating radar (GPR), which takes both the time domain and frequency domain
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Microstrip coils for MR-imaging with induced RF heating for hyperthermia Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-11 Saranraj Narasimman, Sakthisudhan Karuppanan
A highly compact design of a surface MRI coil antenna that can be used for detecting tumour tissues and recovering the tissues from radio therapy has been presented in this practical study. It is a reconfigured MRI array with minimised dimensions by 78.5% compared to that of a reported MRI coil. The design parameters have been validated effectively. Two resonant modes were provided by the MRI coil
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Miniaturized dual-band ridged substrate integrated waveguide cavity resonator and band-pass filters Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-11 Run Cao, Jing-Ya Deng, Rui-Min Shang, Wei Lin, Zhijiao Chen
A novel dual-mode ridged substrate integrated waveguide (RSIW) cavity resonator with miniaturized dimension and independently controllable resonant frequencies is proposed. The ridge patch is designed on the upper surface of the bottom substrate, connected with five shorting vias and etched with four slots. Attributed to the ridge structure, the resonant frequencies of the TE110 and TE120 cavity modes
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Broadband absorber based on multilayer frequency selective surface Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-11 Zhang Wei, Li Jiayu, Li Maojun, Yao Xu, Wan Yuhang
This study proposes a unitized arc-shaped frequency selective surface for achieving broadband absorption. The design is three-layered with the unit cell of each layer being a combination of four identical arcs. The structure possesses a broad absorbing bandwidth along with high absorption. Its absorbing capability is more than 90% in the range of 3.87–10.49 GHz and exceeds 95% in the range of 5.65–10
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Optimized coil turns of receiving ferrite core antenna for wireless magnetic inductive communication Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-11 Jie Feng, Changrong Liu
Turns of coil antenna with ferrite core is the most critical parameter when designing receiving coil antennas for wireless magnetic inductive communication. According to the adjustment of turns, the self-inductance, self-resistance, and mutual inductance of the coil will change respectively. Parallel resonance is often used in receiving coils to obtain a considerable induced voltage which supplies
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Multiuser neural network detectors for large scale MIMO OFDM over Rayleigh Winner-II channel Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-09 Shefin Shoukath, P. A. Haris
Large scale (LS) MIMO orthogonal frequency division multiplexing (OFDM) technique satisfies the demands on performance and the service quality preferred in wireless communication system. Since numerous antenna terminals have been incorporated in the base station, multiuser detection is crucial for retrieving the data appropriately. Thus, the complexities of the detectors increase rapidly in large scale
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Direct synthesis for sequential networks with an arbitrary number of outputs Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-05 Stefano Maddio, Giuseppe Pelosi, Monica Righini, Stefano Selleri
A general approach for the synthesis of the optimal sequential network for use in sequentially rotated antenna (SRA) arrays with an arbitrary number of elements is presented. The performance of this class of antennas are strictly bound to the capacity of the feeding network to produce the nominal power distribution and phase progression. Despite the very high interest in the scientific community on
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Circularly polarized Fabry–Perot antenna with well RCS reduction property Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-05 Peng Xie, Guangming Wang
A circularly polarized (CP) Fabry–Perot (FP) resonator antenna with well radar cross section (RCS) reduction property is presented in this article. Wideband and well in-band RCS reduction for both x- and y-polarized waves are obtained by the proposed antenna. A polarization conversion metasurface (PCM) is designed to make the antenna realize circularly polarized radiation and RCS reduction simultaneously
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A circular-polarized and high-gain microwave correlation imaging antenna based on rotating elements Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-04 Liang Li, Shi-Yu Wang, Jianzhong Chen, Chengwei Zhang, Jing Tang, Tao Su
In this article, a circular-polarized microwave correlation imaging antenna which is based on rotating elements is presented. The proposed reflect array consists of the circular-polarized patches, the filling substrates, and the grounded metal plates. It is known that the key to microwave correlation imaging is the construction of a two-dimensional random radiation field in space. Reflect array antennas
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A circularly polarized pyramidal horn antenna based on substrate integrated waveguide Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-04 Heng Du, Weihua Wang
A circularly polarized pyramidal horn antenna based on substrate integrated waveguide (SIW) technology is proposed and developed for Ku-band applications. The proposed horn antenna is excited by the upper and lower SICL differential feed networks placed vertically to each other, so that two orthogonal waveguide modes with the equal amplitude are generated at the horn aperture. A 90° coupling network
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Concomitance of radio frequency energy harvesting and wearable devices: A review of rectenna designs Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-04 Abida Shaheen Rao, Abdul Aziz, Khaled Aljaloud, Muhammad Ali Qureshi, Aoun Muhammad, Abubakar Rafique, Rifaqat Hussain
Passing through the transformation of wood to coal then to oil and gas, we find ourselves fortunate to witness the next major transformation, which will lead us to the “New Energy Era.” Due to advancements in the field of electronics, energy harvesting has attracted great attraction from researchers and scientists to enhance portability and reliability with reduction in battery wastes. Moreover, wearable
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Compact broadband circularly polarized slot antenna with artificial magnetic conductor reflector Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-02 Liping Han, Kun Chai, Guorui Han, Xinwei Chen, Wenmei Zhang
A compact broadband circularly polarized slot antenna for Sub-6G applications is proposed in this article. It is composed of a broadband slot antenna exited by a Γ-shaped microstrip feedline and an artificial magnetic conductor (AMC) reflector with a wide in-phase reflection phase bandwidth. A unidirectional circularly polarized radiation is achieved by using the AMC reflector consisting of 6 × 6 modified
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Fully shielded and self-packaged compact quarter-mode substrate integrated coaxial line bandpass filter for X and K-band Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-02 Idury Satya Krishna, Soumava Mukherjee
In this work, a dual-mode substrate integrated coaxial line (SICL) bandpass filter supporting single-band and dual-band operation for widely spaced passbands located in X and K - band is proposed. Firstly, a cavity conceived with shorted half-wavelength SICL line is investigated. For enhanced miniaturization, a new SICL cavity is developed from the short-circuited half-wavelength SICL line which is
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Attenuation-tunable balanced bandpass filter based on graphene nanoplates Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-02 Liang Li, Yingxin Cheng, Jianzhong Chen, Rui Hou, Tao Su
In this letter, a unique type of balanced bandpass filter (BPF) with high selectivity and tunable attenuation is proposed through the comprehensive design of a microstrip balanced BPF and graphene nanoplates. In order to achieve the passband response in differential-mode (DM) excitation and produce a wide and deep stopband in common-mode (CM) excitation, the balanced couple of lines are used in balanced
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An efficient synthesis method for large unequally spaced sparse linear arrays based on surrogate models of subarrays Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-02 Weikang Chen, Zhenyi Niu, Yizheng Ruan, Shiyu Shen, Changqing Gu
The synthesis of large arrays with optimization of element locations including mutual coupling effects is always known as a computationally cost task. In this article, an efficient synthesis method for large unequally spaced sparse linear arrays in the presence of coupling effects based on artificial neural network (ANN) surrogate models of subarrays is presented. High-quality ANN surrogate models
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Research on high-efficiency optimization algorithm applied to near-field effect error correction Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-02 Jia Zhang, Mengxia Yu, Ke He
In order to achieve a more efficient and accurate correction of near-field error in the semiphysical radio frequency simulation system, the precise control parameters of the three antenna elements need to be obtained. This article is based on the method of moments electromagnetic simulation, and propose corresponding improvement ideas for the problems of limited optimization accuracy and low calculation
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A micromachined ultra-wide stopband lowpass filter based on stepped impedance resonator loaded T-shaped structure Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-02 Ruihua Liang, Cheng Guo, Qian Yang, Guanghua Shi, Zhen Wang, Anxue Zhang
This article presents an additively manufactured micro-coaxial lowpass filter with ultra-wide stopband suppression. To achieve a wide stopband response, two-stage stepped impedance resonator loaded T-shaped structures are used to substitute the low impedance transmission lines in the lowpass filter prototype to generate extra transmission zeros in the stopband. Shunt open-ended stubs are introduced
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Active and passive mixed millimeter wave imaging target recognition method based on multi-feature fusion Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-02 He Zhang, Hua Zong, Jinghui Qiu
Due to millimeter-wave (MMW) has a strong ability to penetrate clothing, MMW holographic imaging technology can conduct a non-contact inspection of the human body's surface. Therefore, it is of great significance to study the security inspection equipment and target recognition technology based on millimeter wave imaging. In this paper, an active and passive hybrid millimeter wave imaging target recognition
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Simultaneous flattening of amplitude and group delay responses in narrowband bandpass filters using a novel systematic design method Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-11-01 Ahmad Reza Eskandari, Ali Kheirdoost
In this article, a novel systematic method for compensation of the simultaneous amplitude and group delay (GD) flatness in the narrowband bandpass filters is proposed. The proposed technique can be used systematically in any type of filters with the possibility of resonator quality factor adjustment. This technique is presented using an RLC resonator equalizer in two steps. First, the compensation
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A compact radio frequency identification tag antenna with loaded coupling rings for two-side anti-metal design Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-29 Chenchen Niu, Jiade Yuan, Zhizhang (David) Chen, Zhimeng Xu
A compact ultra-high frequency radio frequency identification tag antenna loaded with a pair of rectangular coupling rings for two-side anti-metal performance is proposed. It evolves from a planar inverted-F antenna and has the same upper and lower structures. A pair of coupling rings is symmetrically loaded on the inner sides of the upper and lower substrates, and the tag's maximum power transmission
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A 2D substrate integrated waveguide monopulse slot antenna array with dual-mode comparator Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-28 Zhichao Sun, Shaobin Liu, Wenhui He, Tong An, Zhiyong Hu, Yuning Yang, Xinyuan Zheng
A double-layer 2D substrate integrated waveguide monopulse slot antenna array is proposed. By adopting the dual-mode monopulse comparators (DMCs), the isolations between ports are significantly improved. The antenna generates “sum” and “difference” patterns in the orthogonal axis with a pair of DMCs. The DMC for azimuth plane tracking and the radiating 4 × 4 slots are located on the top layer, and
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Design of a microwave power transmission demonstration system for space solar power station Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-28 Ying Wang, Gao Wei, Shiwei Dong, Yazhou Dong, Xiaojun Li
A microwave power transmission (MPT) demonstration system was assembled to comprehensively emulate the operating mode of MPT in space solar power station (SSPS). Based on solid power amplifier and phased antenna array, this system comprised three main parts, that is, microwave power transmitting subsystem, microwave power rectenna subsystem, and power beam steering subsystem. It was employed to validate
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Optimal design of CMOS mixer: A research review Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-28 Huan Zhang, Sida Tang, Mengye Cai, Yanfeng Jiang
A mixer is an indispensable device in the RF transceiver system. Along with the rapid development of mobile communication technology, the demand on the RF mixer for compatibility with multiple communication standards and functional diversity is increasing. As a result, the mixer with wider bandwidth, lower noise, higher linearity, and less power consumption is urgently needed. In the article, the basic
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A 3 dB SISL coupler design by multi-objective evolutionary algorithm based on decomposition Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-28 Yongliang Zhang, Yu Yi, Linping Feng, Guangfei Qi, Xianfang Zhang, Xiaoping Zhang, Chen Yang
In this article, a 3 dB substrate integrated suspended line (SISL) coupler design by multi-objective evolutionary algorithm based on decomposition (MOEA/D) is proposed. SISL technology can provide electromagnetic shielding performance and realize the low loss, lightweight, and self-packaging. The highly time-consuming problem of adopting traditional electromagnetic (EM) simulation software to assist
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Narrow transverse-size compact vertically polarized end-fire antenna using dual-hat composite elements Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-27 Li Guo
A narrow transverse-size compact end-fire antenna with vertical polarization (VP) is presented in this paper. The antenna working in the 433 MHz band is constructed based on a dual-hat composite element, which consists of a rectangular and a pentagon top hat. This is operated in terms of capacitive coupling and inductive loading. Two dual-hat composite elements are, respectively, applied as the driven
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A new method with integration of matching and decoupling for MIMO antenna applications Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-27 Shun Li, Qing-Xin Chu
A novel design concept of multiple-input and multiple-output (MIMO) antenna with aiming to improve matching and port isolation at the same time is proposed. As the only additional component, a cross resonator is connected between the two patch antennas. The equivalent circuit model and calculation formula of resonant frequency of cross resonator in differential mode (DM) and common mode (CM) state
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Coupled-line rat-race couplers with smooth in-phase and out-of-phase performances Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-27 Yiwen Wei, Yongle Wu, Weimin Wang, Yuhao Yang, Yifan Zhang, Yuanan Liu
In this paper, a novel rat-race coupler with smooth in-phase and out-of-phase performance is proposed. The structure is based on two sections of strong coupling coupled-lines. A weak coupling coupled-line is connected between the two sections on the upper line in series, and another is connected between the two sections on the lower line in shunt. In the working band, it has strong coupling, good impedance
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A hemispherical near-field focusing antenna for non-metallic delamination detection Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-26 Xiaoqing Yang, Shanshan Long, Piqiang Su, Yi Xie, Xiaoyu Zhai, Hexin Dong, Meng Li, Xueliang Wang
This paper proposes a novel hemispherical near-field focusing radial line slot array (RLSA) antenna to detect delamination within non-metallic composites. By adjusting the positions and dimensions of the antenna slots, the near-field focusing antenna produced a radiation pattern with a narrow beamwidth and a low side lobe level of the normal component of the electric field. Since the electromagnetic
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Design of a hexagonal slot rectenna for RF energy harvesting in Wi-Fi/WLAN applications Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-26 Abhishek Dhar, Prabina Pattanayak, Akhilesh Kumar, Devendra Singh Gurjar, Brijesh Kumar
This work proposes a single port hexagonal slotted rectenna operating at 2.45 GHz Wi-Fi bands, using a hexagonally slotted shape of microstrip radiator surface followed by a voltage rectifier circuit using Schottky diode. A symmetrically extended ground plane and rectangular slots help in obtaining the desired resonance characteristics with improved antenna bandwidth. Three different antenna designs
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A diamond NV centers-based magnetic field sensor using a high-Q waveguide bandpass filter Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-26 Weiming Ma, Zhaokai Wang, Yang Gao, Lei Li, Guanxiang Du, Haizhong Guo
In diamond nitrogen-vacancy (NV) magnetic field sensors, microwave delivery and irradiation with efficient, uniform, and wide dynamic range are necessary to achieve more accurate measurement and higher sensitivity. Here, we report on the development of a triple-mode broadband waveguide bandpass filter (BPF), which uses a high-Q metallic cavity to transfer the microwave and excite the diamond NV spin
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Design of a four-way out-of-phase wideband filtering power divider with high selectively response Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-26 Dawei Wang, Wenlei Wang, Qian Tan, Hua Yang, Yi Cao, Wanchun Tang, Jiquan Yang
This paper proposes a four-way out-of-phase wideband filtering power divider (OWFPD). By introducing a multiport out-of-phase topology, and a pair of multimode U-shape slotline resonators, satisfactory wideband out-of-phase filtering power division responses can be easily achieved. Owing to the different standing wave distribution of the slotline, adjacent out ports can exhibit out-of-phase characteristic
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A review of microwave electronically scanned array: Concepts and applications Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-26 Si-Cheng Sun, Yi-Jiu Zhao, Yan-Ze Zheng, Nai-Xin Zhou, Yong-Ling Ban
As the application of microwave to radar and 5G communication goes wider, the array beam scanning capability has become an important and popular issue in modern society. Appropriate implementation of beam scanning methods suitable for diverse conditions could provide better performance and help to save costs for a system. Moreover, electronically scanned array has the characteristics of fast beam switching
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Design and fabrication of flexible and frequency reconfigurable antenna loaded with copper, distilled water and seawater metamaterial superstrate for IoT applications Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-26 Sunil P. Lavadiya, Shobhit K. Patel, Kawsar Ahmed, Sofyan A. Taya, Sudipta Das, Vasu Babu K.
The manuscript represents a novel superstrate metamaterial loaded microstrip patch antenna to achieve multiband frequency reconfigurability. The performance is observed for the frequency band of 4 to 8 GHz. Metamaterial property is enabled by engraving triangular-shaped split-ring resonators in the substrate. Frequency tunability is achieved based on the switching mechanism of three PIN diodes. Different
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Ku/E dual-band shared-aperture antenna array for phased array applications Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-25 Si-Cheng Sun, Yi-Jiu Zhao, Yan-Ze Zheng, Nai-Xin Zhou, Yong-Ling Ban, Wei Zhu, Li-Feng Guo
This article presents a dual-band shared-aperture antenna array for a phased array system operating in the Ku/E-bands with a large frequency ratio. A regular array arrangement is used to arrange single-layer coupled microstrip patch elements that operate in the Ku-band. E-band elements using slot-coupled microstrip patch antennas are arranged in a sparse concentric circular array configuration. In
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A differential fed wideband base station antenna with director and U-shaped slot Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-25 Jin Wen Guo, Qing-Xin Chu
In this article, a wideband base station antenna is designed. A new resonant mode is introduced into the antenna. Finally, four U-shaped slots are added to the dipole of the antenna, and the antenna's third resonant mode is close to the first two resonant modes, which makes the antenna achieve wideband performance. The antenna is fabricated, and its performance is measured. The results show that the
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Wideband high-gain planar end-fire antenna based on spoof surface plasmon polaritons and loaded with I-shaped resonators Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-25 Zheng Liang, Shi-Shan Qi, Wen Wu
A wideband high-gain millimeter-wave planar end-fire antenna based on spoof surface plasmon polaritons (SSPPs) is proposed. A symmetric SSPP transmission line is used to adjust the phase of the wave on the outer edges. By loading metal strips with I-shaped resonators, a transmission line which exhibits a SSPP-like behavior is formed. It is used to extend the lower limit of the working bandwidth from
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Continuous wideband dual-channel-based high-efficiency rectifier for wireless charging systems Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-24 Kaijun Song, Shan Deng, Qian Li, Yong Fan
A microwave continuous wideband rectifier using dual-channel structure with high power conversion efficiency for wireless charging system is proposed in this paper. The Schottky diode HSMS-286 E is adopted to realize the high-power conversion efficiency. The wide bandwidth is achieved by using the multipath combining circuit, which can be applied to design high-efficiency rectifier with arbitrary bandwidth
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A single cavity wideband passband filter with a notched band Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-22 Yong-Liang Zhang, Tian-Xiang Yang, Jie Liu, Zhi-Xi Chen, Zhi-Chong Zhang
This paper presents a wideband cavity filter with a notched band. The wideband bandpass characteristics are obtained by a cylindrical cavity with two symmetrical conductive posts. The notch with the center frequency of 2 GHz is obtained by loading two symmetrical notched elements, and the notched elements consist of a stepped impedance structure. In addition, the two symmetrical notched elements are
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A comprehensive survey of massive-MIMO based on 5G antennas Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-22 Suverna Senger, Praveen Kumar Malik
The rapid increase in the innovation of fifth-generation (5th G) technology is a critical indicator of an explosion in technologies that satisfy everyday needs, and antennas for 5G with reduced delay, minimal path loss, and a continuous pattern of radiation will be essential. The upcoming 5G Massive multiple inputs, multiple outputs (MIMO) antenna will improve the performance of future-generation wireless
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Compact antenna integrated with a Greinacher voltage multiplier for ambient energy harvesting applications Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-22 Hafiz Subbyal, Waqas Ali, Sun Liguo
Radio frequency (RF) energy harvesting from freely available electromagnetic fields is a promising alternative for powering smart electronic devices. This article presents a compact and efficient rectenna for RF energy harvesting at an Industrial, Scientific, and Medical (ISM) band of 2.4 GHz. A compact microstrip antenna with opened-end slots and a full ground plane is designed. Moreover, a Greinacher
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An EH2-mode microstrip leaky-wave antenna with single beam radiation and backward-to-forward scanning Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-22 Runze Liu, Henghui Wang, Kuiwen Xu, Sheng Sun
In this work, a leaky-wave antenna (LWA) based on the second higher-order-mode (EH2-mode) microstrip line is proposed for achieving the backward-to-forward beam scanning and single main beam radiation. The original microstrip EH2-mode LWA inherently radiates two symmetric beams in the transversal plane. By loading a series of longitudinal slots, the dual-beam radiation of the antenna is converted into
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A single-layer high-isolation multiple-input-multiple-output antenna for millimeter wave applications Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-22 Sheng Xie, Yuyuan Fan, Yu Luo, Kaixue Ma
This paper presents a method for simultaneously improving the matching and the isolation of multiple-input-multiple-output (MIMO) antenna arrays. A two-element array with substrate integrated waveguide (SIW) structure and vias are designed to improve impedance matching and isolation without using traditional matching networks. The SIW structure consists of metal vias surrounding around three sides
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Parameter extraction for small-signal model of GaN HEMTs on SiC substrates based on modified firefly algorithm Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-22 Yuan Liu, Fengrui Cao, Xiaoming Xiong, Junkai Huang, Wanling Deng
In this article, an improved firefly algorithm is proposed to extract the parameters of the small signal model of GaN HEMTs on SiC substrates. First, the initial values of the parameters are extracted directly by pinch-off, un-biased cold S-parameters and hot S-parameters. Second, an improved firefly algorithm is proposed to optimize parameters. Finally, in order to verify this method, the performances
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A compact, high isolation building block for 8 × 8 multi-input multi-output antenna array suitable for 5G smartphone applications Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-22 Surendra Kumar Gupta, Amit Bage, Pinku Ranjan
In this article, compact inverted F-antennas (IFAs) operating in the 3.5 GHz band is proposed for future 5G smartphone applications. The conventional IFA is modified to make the structure compact and efficient. The additional IFAs are aligned in face-to-face configuration to reduce the coupling between them up to some extent. Furthermore, a novel decoupling element is incorporated between antenna pairs
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Design of broadband electromagnetically coupled planar antenna and array for 60 GHz millimeter wave applications Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-21 Saswati Ghosh, Debarati Sen
The millimeter wave frequency range is found suitable for 5G communications. The design of suitable antenna/array is required for this purpose. This article presents a broadband electromagnetically coupled modified microstrip patch antenna for millimeter wave communications at 60 GHz. The antenna structure is designed and optimized with the help of commercial electromagnetic simulation software. For
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A broadband loose coupling coupler with discrete structure and hybrid binary particle swarm genetic optimization algorithm Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-21 Zeren Song, Hongliang Tian, Tao Zuo, Jiaxin Kuang
In this paper, a 30 dB broadband microstrip directional coupler is designed by using a discrete coding type coupling structure with a co-simulation technique. Combined with the proposed hybrid binary particle swarm genetic optimization algorithm (HBPSGOA) and the carefully designed fitness function, the discrete coding type structure can provide satisfactory flexibility and excellent performance. For
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High selectivity balanced bandpass filter using improved parallel-coupled line with intrinsic deep common-mode suppression Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-21 Baoping Ren, Bo Zhao, Xuehui Guan
In this article, a balanced bandpass filter (BPF) is developed by using the improved parallel-coupled line (IPCL) and the parallel-coupled-line-loaded resonators (PCLLRs). The proposed IPCL, which is realized by loading the short-circuited or open-circuited parallel-coupled line section to the traditional one, behaves the bandpass response or bandstop property. Thus, feeding structure of balanced BPF
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A metasurface enabled dual band antenna exhibiting dual polarizations with reduced beam squint and cross polarization Int. J. RF Microw. Comput.-Aided Eng. (IF 1.7) Pub Date : 2022-10-20 Shyam Sundar Jash, Rowdra Ghatak
A compact, dual-band metasurface-based microstrip patch antenna with both linear and circular polarization (CP) for multiband communication is reported in this work. The ingredients in the antenna design consist of a combination of metasurface and metamaterial inspired structures that are demonstrated as an effective technique to correct the beam squint problem and reduce the cross-polarized radiation