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Research on Multibeam Pattern Synthesis of Time Modulated Array Based on Convex Optimization Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-03-04 Jiawen Hu; Xikuan Dong; Jing Tan; Yachao Jiang; Hailin Li
An efficient multibeam pattern synthesis method for time modulated array (TMA) is proposed in this paper. The aim of this method is to generate a beam pattern on the specified sideband of TMA. The pattern synthesis problem is divided into two stages. In the first stage, the sequential convex optimization method is used to suppress the sidelobe of the center frequency and reduce the amplitude dynamic
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A PSO-CVX Algorithm of Sum and Difference Beam Patterns for Time-Modulated Antenna Array Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-03-03 Xikuan Dong; Hailin Li; Jing Tan; Jiawen Hu; Yachao Jiang
An integrated optimization of sum and difference beam for time-modulated linear antenna array is studied in this paper. The goal of sum and difference beam synthesis is to generate sum beam in the main band and difference beams in the first-order sideband with low side-lobe level through timing switches. The turn-on times of antenna array are achieved by solving a quadratic constraint linear programming;
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Three-Dimensional MIMO Channel Model with High-Mobility Wireless Communication Systems Using Leaky Coaxial Cable in Rectangular Tunnel Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-02-23 Kai Zhang; Fangqi Zhang; Guoxin Zheng; Lei Cang
With the rapid development of high-mobility wireless communication systems, e.g., high-speed train (HST) and metro wireless communication systems, more and more attention has been paid to the wireless communication technology in tunnel-like scenarios. In this paper, we propose a three-dimensional (3D) nonstationary multiple-input multiple-output (MIMO) channel model with high-mobility wireless communication
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Mutual Coupling Reduction Using Improved Dual-Layer Mushroom and E-Shaped Stub Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-02-19 Chunxia Cheng; Liyan Luo
The improved dual-layer mushroom (IDLM) and back-to-back E-shaped stubs for mutual coupling reduction between microstrip patch antennas are presented in this paper. The IDLM unit consists of one upper layer complementary split-ring resonator lattice and four lower layer lattices, whose centers are connected to the ground by a pin. The decoupling structure can prevent the surface current from one antenna
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A Compact Quasi-Yagi Antenna with High Gain by Employing the Bent Arms and Split-Ring Resonators Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-02-19 Wen-Ying Zhou; Zhong-Lei Mei; Mai Lu
A compact quasi-Yagi antenna with bent arms and split-ring resonators (SRRs) is proposed. Compared with traditional quasi-Yagi antennas employing straight arms, the resonant frequency of the proposed antenna could be always consistent with its center frequency, and there is no obvious frequency shift under the process of its miniaturization. The SRRs are adopted in the proposed compact antenna for
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Realization of Multimode OAM Beams with Almost the Same Divergence Angles Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-02-18 Yunfan Zhang; Xianling Liang; Weihao Qi; Hongliang Wu; Qian Chen; Junping Geng; Wei Wang
This paper proposes a new method of realizing multimode OAM beams with almost the same divergence angles. The theoretical relationship between the divergence angle of the OAM beam and its radiation source is presented, and the radiation source distributions for various mode OAM beams with the same divergence angle range are discussed. In order to verify this method, an eight-mode OAM antenna constructed
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Optimization of Modified Yagi-Uda Nanoantenna Arrays Using Adaptive Fuzzy GAPSO Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-02-17 Pitther N. Santos; Victor Dmitriev; Karlo Q. da Costa
This paper presents an optimization of the radiation and absorption characteristics of modified Yagi-Uda (YU) nanoantenna arrays. Four geometries of antennas are considered: conventional YU fed by voltage source and transmission line, and YU with a loop element fed by voltage source and transmission line. The numerical electromagnetic simulations of these nanoantennas were made by the method of moments
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A Framework for Human Activity Recognition Based on WiFi CSI Signal Enhancement Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-02-16 Jieming Yang; Yanming Liu; Zhiying Liu; Yun Wu; Tianyang Li; Yuehua Yang
With the advancement of wireless technologies and sensing methodologies, many studies have shown that wireless signals can sense human behaviors. Human activity recognition using channel state information (CSI) in commercial WiFi devices plays an important role in many applications. In this paper, a framework for human activity recognition was constructed based on WiFi CSI signal enhancement. Firstly
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Approximate Crank–Nicolson Algorithm with Higher-Order PML Implementation for Plasma Simulation in Open Region Problems Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-02-10 Liqiang Niu; Yongjun Xie; Jie Gao; Peiyu Wu; Haolin Jiang
By incorporating the higher-order concept with the perfectly matched later (PML) scheme, unconditionally stable approximate Crank–Nicolson algorithm is proposed for plasma simulation in open region problems. More precisely, the proposed implementation is based on the CN Direct-Splitting (CNDS) procedure for the finite-difference time-domain (FDTD) unmagnetized plasma simulation. The unmagnetized plasma
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Research on Transmission Capacity Characteristics of the Cluster Flight Spacecraft Network Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-02-09 Li Su; Jian Wu; Jinrong Mo
In order to analyze the transmission capacity performance of the cluster flight spacecraft network, there are two different types of outage performance theory which are derived in this paper. First of all, by applying the mean value theorem of integrals, the expression of the outage probability of decode-and-forward relaying is derived. Subsequently, according to the Macdonald random variable form
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Linear Array Synthesis for Wireless Power Transmission Based on Brain Storm Optimization Algorithm Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-02-04 Guang Xu Liu; Qin Qin; Qing He Zhang
Based on the brain storm optimization algorithm, this paper proposed a new method to optimize the beam collection efficiency of the linear antenna array. In the process of optimization, constraints such as aperture size and minimum antenna spacing are considered. In this paper, the optimization with different antenna apertures, different antenna angles, and different array numbers are studied. A series
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An Efficient Semianalytical Modal Analysis of Rectangular Waveguides Containing Metamaterials with Graded Inhomogeneity Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-02-02 Qianru Weng; Qian Lin; Haifeng Wu
Rectangular waveguides containing inhomogeneous metamaterials with graded refractive-index profiles have potential applications in bending waveguides and radiation-enhanced antennas, and accurate eigenvalue solutions are prerequisite. Commonly used commercial electromagnetic solvers such as HFSS, COMSOL, and CST could not efficiently calculate the eigenvalues of waveguides containing graded refractive-index
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Virtual Reconstruction-Based Robust Adaptive Beamforming for Distributed Digital Subarray Antennas Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-01-31 Jian Lu; Jian Yang; Bo Hou; Fengchao Zhu; Zhiyong Yu; Guangbin Liu
For the distributed digital subarray antennas (DDSA), the conventional beamforming may give rise to grating lobes, high sidelobes, and other problems. In this paper, the gaps between the subarrays are filled with virtual array elements, and then the DDSA can form a virtual contiguous array. More concretely, based on the direction-of-arrival (DOA) estimation of the signal sources, the interference components
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MTM- and SIW-Inspired Bowtie Antenna Loaded with AMC for 5G mm-Wave Applications Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-01-30 Ayman A. Althuwayb
This paper investigates a feasible configuration of slotted bowtie antenna based on MTM and SIW properties for 5G millimeter-wave applications. To realize the proposed slotted bowtie antenna in a compact dimension with high performances, the MTM and SIW concepts are implemented by applying the trapezoidal slots on the top surface of the antenna and metallic via holes through the substrate layer connecting
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Study of the Propagation Characteristics of Terahertz Waves in a Collisional and Inhomogeneous Dusty Plasma with a Ceramic Substrate and Oblique Angle of Incidence Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-01-29 Qingwen Rao; Guanjun Xu; Pengfei Wang; Zhengqi Zheng
In this paper, the propagation properties of a terahertz (THz) wave in a collisional and inhomogeneous dusty plasma with a ceramic substrate and oblique angle of incidence are studied using the scattering matrix method. The influence of the various corresponding parameters, such as the frequency of the THz wave, angle of incidence, electron density, radius and density of the dust particles, and the
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Multiview ISAR Imaging for Complex Targets Based on Improved SBR Scattering Model Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-01-25 Tiantian Feng; Lixin Guo
A novel multiview inverse synthetic aperture radar (ISAR) imaging method is proposed to simulate high-resolution and identifiable ISAR image of complex targets by handling large-angle and wide-bandwidth scattering data. The scattering data are simulated with the shooting and bouncing ray (SBR) method. The bidirectional ray-tracing algorithm is developed to reduce the computation time. Simulation results
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Right/Left-Handed Leaky Rectangular Waveguide with Broadside Radiation Property Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-01-21 Xingying Huo; Zheng Li
When a leaky rectangular waveguide is used to realize the coverage of radio wave in the small confined spaces, there will be a shadow region, which influences the coverage performance. In this paper, the traditional leaky rectangular waveguide is improved according to the principle of the equivalent circuit, by cutting interdigital slots in the upper wall and adding uniserial metal vias between the
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Research on 2.4 GHz Wireless Channel Propagation Characteristics in a Steel Ship Cabin Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-01-19 Wanli Tu; Hong Xu; Yiqun Xu; Qiubo Ye; Mingxian Shen
Wireless sensor network (WSN) has become a popular technology and has a good potential application in naval architecture and marine engineering field. Analysis of transmission ability of wireless signal in steel ship environment is important for network deployment including base station and node installation, which would directly impact network performance and has become a hot research field. This
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Three Configurations of Compact Planar Multistub Microstrip Antennas for mmW Mobile Applications Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-01-16 Asma Lak; Zahra Adelpour; Homayoon Oraizi; Naser Parhizgar
Three configurations of compact planar multistub antennas are proposed in the frequency range of 27–29.5 GHz as candidates for the 5G standard frequency band. Each antenna consists of the same feeding part configuration but different structures for the dipole, director, and reflector parts. The feeding part is based on the substrate integrated waveguide (SIW) technology which results in compact size
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A Compact, Bistatic Antenna System with Very High Interport Isolation for 2.4 GHz In-Band Full Duplex Applications Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-01-16 Haq Nawaz; Nosherwan Shoaib; Ahmad Umar Niazi; Shabbir Majeed Chaudhry
This paper presents a compact, dual polarized bistatic (two closely spaced transmit and receive radiators) patch antenna with excellent interport isolation performance. The presented antenna system employs differential receive mode operation for the cancellation of self-interference (SI) to achieve very high interport isolation for 2.4 GHz in-band full duplex (IBFD) applications. The presented antenna
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Thinned Virtual Array for Cramer Rao Bound Optimization in MIMO Radar Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-01-15 Xia Li; Buhong Wang
By transmitting multiple independent waveforms at the transmit side and processing echoes of spatial targets at the receive side, Multiple Input Multiple Output (MIMO) radar enjoys virtual array aperture expansion and more degree of freedom (DOF), both of which favors the application of direction finding or estimation of direction of arrival (DOA). The expanded virtual aperture provides higher angular
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On-Chip Antenna Design Using the Concepts of Metamaterial and SIW Principles Applicable to Terahertz Integrated Circuits Operating over 0.6–0.622 THz Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-12-08 Ayman A. Althuwayb
This research work presents the investigation of realizing an on-chip antenna based on the metamaterial concept, which is working over the terahertz (THz) band for applications in integrated circuits. The proposed on-chip antenna is constructed of five stacked layers of polyimide and aluminum as top and bottom substrates, radiation patches, ground plane, and feed line. The four square-shaped radiation
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Analytical Nonstationary 3D MIMO Channel Model for Vehicle-to-Vehicle Communication on Slope Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-01-13 Kaizhen Liu; Zaixue Wei; Sibo Chen
Vehicle-to-vehicle communication plays a strong role in modern wireless communication systems, appropriate channel models are of great importance in future research, and propagation environment with slope is one special kind. In this study, a novel three-dimensional nonstationary multiple-input multiple-output channel model for the sub-6 GHz band is proposed. This model is a regular-shaped multicluster
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Lowering the Sidelobe Level of a Two-Way Pattern in Shared Aperture Radar Arrays Int. J. Antennas Propag. (IF 1.207) Pub Date : 2021-01-06 John N. Sahalos
A study of lowering the peak SLL of shared aperture radar arrays is presented. A two-weight amplitude distribution for the elements of transmit and receive arrays is used. Imposing certain conditions, the relation of the number of elements of the arrays was found. One condition imposes the appearance of a minor lobe position of transmit or receive array pattern at a certain null of receive or transmit
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Development of a Pin Diode-Based Beam-Switching Single-Layer Reflectarray Antenna Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-12-29 Muhammad Inam Abbasi; Muhammad Yusof Ismail; Muhammad Ramlee Kamarudin
This paper presents a practical demonstration for the design and development of a switchable planar reflectarray using PIN diodes in the X-band frequency range. Waveguide scattering parameter measurements for the unit cells and far-field measurements of the periodic reflectarrays have been carried out to verify the predicted results. Reflectarray unit cell measurements demonstrated a frequency tunability
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Radio Propagation Measurements in the Indoor Stairwell Environment at 3.5 and 28 GHz for 5G Wireless Networks Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-12-28 Ahmed Al-Saman; Marshed Mohamed; Michael Cheffena
To cover the high demand for wireless data services for different applications in the wireless networks, different frequency bands below 6 GHz and in millimeter-wave (mm-Wave) above 24 GHz are proposed for the fifth generation (5G) of communication. The communication network is supposed to handle, among others, indoor traffic in normal situations as well as during emergencies. The stairway is one of
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Diffuse Scattering Directive Model Parameterization Method for Construction Materials at mmWave Frequencies Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-12-23 Ming-Hao Ren; Xi Liao; Jihua Zhou; Yang Wang; Yu Shao; Shasha Liao; Jie Zhang
The determination for diffuse scattering model parameters is of critical importance to improve the accuracy of prediction and analysis for millimeter-wave radio propagation. In this paper, a reliable parameterization method with a simplified tuning procedure for a diffuse scattering model is proposed and validated based on measurements and ray-tracing simulations. Typical construction materials are
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A Low-Profile Antenna Based on Single-Layer Metasurface for Ku-Band Applications Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-12-16 Yadgar I. Abdulkarim; Halgurd N. Awl; Fahmi F. Muhammadsharif; Muharrem Karaaslan; Rashad H. Mahmud; Sattar O. Hasan; Ömer Işık; Heng Luo; Shengxiang Huang
Improvement in the antenna gain is usually achieved at the expense of bandwidth and vice versa. This is where the realization of this enhancement can be made through compromising the antenna profile. In this work, we propose a new design of incorporating periodic metasurface array to enhance the bandwidth and gain while keeping the antenna to a low-profile scheme. The proposed antenna was simulated
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Novel Low-Cost Integrated Multiband Antenna Design Customized for Smartwatch Applications with SAR Evaluation Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-12-15 Brahim Fady; Abdelwahed Tribak; Jaouad Terhzaz; Fatima Riouch
This paper presents a novel low-cost integrated multiband antenna design customized for smartwatch applications and wearable devices. The design consists in using a broadband planar patch antenna with circular microstrip lines and a miniaturized feeding-point with a structure of 30 × 30 × 1.6 mm3, and it is easy to deploy inside the smartwatch and cost-effective for the wearable device industry. The
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A Compact Triple Band EBG Using Interdigital Coplanar Waveguide Structure for Antenna Gain Enhancement Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-12-11 Prapoch Jirasakulporn; Pongsathorn Chomtong; Kamorn Bandudej; Prayoot Akkaraekthalin
A new triple band EBG unit cell with compact size has been designed, fabricated, and tested. The proposed EBG unit cell is based on a square mushroom-like EBG (M-EBG) structure with an interdigital coplanar waveguide (ICPW). With this technique, the size of the proposed ICPW-EBG structure has been reduced from λ/2 to λ/4 compared with the conventional M-EBG unit cell dimension, which is 18 × 18 mm2
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Design of a 324 MHz 200 kW CW Waveguide-to-Coaxial Adaptor for Radio Frequency Quadrupole Microwave System Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-12-10 Xinsheng Yan; Lianmin Zhao; Bojiang Ding; Weiye Xu; Hua Jia; Zege Wu; Fukun Liu
A 324 MHz 200 kW waveguide-to-coaxial adaptor has been designed and fabricated for a microwave coupler in a radio frequency quadrupole system. Optimization of the adaptor is performed by the numerical study and experimental test. High-power measurements show that the reflection coefficient of the adaptor is less than −30 dB at the RFQ operating frequency, and there is no breakdown in the 228 kW pulse
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Design and Analysis of a Five-Band Polarization-Insensitive Metamaterial Absorber Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-12-08 Han Wu; Shijun Ji; Ji Zhao; Chengxin Jiang; Handa Dai
A five-band metamaterial absorber (MMA) is presented. The proposed absorber consists of a three-layer structure of the top metal resonator, intermediate dielectric layer, and bottom metal plane. The top structure takes the centroid as the center and spreads out in a three-pronged shape with an average of 360°, and the ends bifurcate again. The calculation was carried out by the professional software
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Measurement and Statistical Analysis of Distinguishable Multipaths in Underground Tunnels Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-12-07 Junchang Sun; Shuai Ma; Hui Zhou; Chun Du; Shiyin Li
Compared with the line-of-sight (LOS) condition, the multipath effect is more serious in the non-line-of-sight (NLOS) condition. Therefore, the LOS and NLOS identification is necessary for the multipath analysis of signal propagation. The commonly used method is the support vector machine (SVM) method with high computational complexity. To tackle this problem, this paper adopts the SVM classifier based
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Bandwidth Enhancement on Half-Mode Substrate Integrated Waveguide Antenna Using Cavity-Backed Triangular Slot Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-12-03 Dian Widi Astuti; Muhamad Asvial; Fitri Yuli Zulkifli; Eko Tjipto Rahardjo
This paper proposes bandwidth enhancement of a cavity-backed slot antenna using a triangular slot on a half-mode substrate integrated waveguide structure antenna. The bandwidth enhancement was achieved by combining the fixed TE101 and the downward shifting TE102 modes, resulting in hybrid modes. The design evolution of the slot antenna from a half nonresonating rectangular slot to a triangular slot
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Performance Analysis of Conventional Beamforming Algorithm for Angle-of-Arrival Estimation under Measurement Uncertainty Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-12-02 Eun-Kyung Lee; Joon-Ho Lee
The performance of the conventional beamforming for angle-of-arrival (AOA) estimation algorithm under measurement uncertainty is analyzed. Gaussian random variables are used for modeling measurement noises. Analytic expression of the mean square error (MSE) is obtained via Taylor series expansion. In traditional performance analysis, estimation accuracy in terms of the MSEs is usually obtained from
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Design of a Broadband Radome-Enclosed Dual-Polarization Antenna Array Covering Sub-6 GHz Band with Differential Feeding Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-12-01 Zhirong An; Mang He
A differentially fed dual-polarized antenna with low cross-polarization is proposed for sub-6 GHz applications. The main patch is fed through two pairs of symmetrical ports, and annular-ring slits are etched around the feedings. The broadband 180° phase shifter provides a stable differential feeding structure, and a 1 mm thick radome with a parasitic patch printed on its inner surface is utilized to
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Dual-Band 2 × 2 MIMO Antenna with Compact Size and High Isolation Based on Half-Mode SIW Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-11-27 Abubaker Ahmed Elobied; Xue-Xia Yang; Ningjie Xie; Steven Gao
This paper presents a close-spaced dual-band 2 × 2 multiple-input multiple-output (MIMO) antenna with high isolation based on half-mode substrate integrated waveguide (HMSIW). The dual-band operation of the antenna element is achieved by loading a rectangular patch outside the radiating aperture of an HMSIW cavity. The HMSIW cavity is excited by a coaxial probe, whereas the rectangular patch is energized
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Parametric Analysis of Negative and Positive Refractive Index Lens Antenna by ANSYS HFSS Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-11-25 Phan Van Hung; Nguyen Quoc Dinh; Yoshihide Yamada; Naobumi Michishita; Mohammad Tariqul Islam
Lens antennas with multibeam, high gain, and low sidelobe level are potential candidates for base station antennas in 5G mobile communication. In this paper, the authors perform simulation and parametric analysis of a lens antenna with positive and negative refractive indexes (NRI) using the modern electromagnetic field simulation software ANSYS HFSS. The simulation results of structures and theoretical
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Optimization of Wireless Communication Coverage in Underground Tunnels Based on Zone Division Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-11-23 Yu Huo; Qingsong Hu; Yanjing Sun; Xiwang Guo; Liang Qi; Xiaohu Zhao; Enjie Ding
In order to reduce the path loss of the wireless communication signal in the underground tunnel, a scheme for configuring the antenna polarization of wireless systems based on a zone-division method is proposed. A multimodal method is used to estimate the effect of antenna polarization on the wireless propagation. When the optimal polarization of the antenna leading to low path loss is different in
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A Conceptual Investigation of a Large Radio Telescope Support Point Number Effect on Its Pointing Accuracy Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-11-23 Song Xue; Kaitong Ma; Congsi Wang; Peiyuan Lian; Yan Wang; Yuefei Yan; Qian Xu; Yuanpeng Zheng; Na Wang
The purpose of this paper is to investigate a large radio telescope support point number effect on its pointing accuracy and provide a useful guideline for the large radio telescope design engineer. In a large radio telescope system, the azimuth track is used to support the whole telescope structure and the mounting error as well as the telescope wheel-track contact in a long term can cause unevenness
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Ship Velocity Estimation in Airborne Along-Track Interferometric SAR Imagery Based on the Fractional Fourier Transform Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-11-16 Chao Chen; Yan Li; Kuihua Huang; Yonghong Long; Linlin Zhang; Kewei Ouyang
Synthetic aperture radar (SAR) was originally exploited to image stationary scenes. However, it is important to derive target information of velocity for many applications. The fractional Fourier transform (FrFT) is a generalization of the classical Fourier transform and is well-known as a useful tool to estimate the chirp rate of linear frequency-modulated (LFM) signals. Motion compensation is critical
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Antenna Optimization Design Based on Deep Gaussian Process Model Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-11-12 Xin-Yu Zhang; Yu-Bo Tian; Xie Zheng
When using Gaussian process (GP) machine learning as a surrogate model combined with the global optimization method for rapid optimization design of electromagnetic problems, a large number of covariance calculations are required, resulting in a calculation volume which is cube of the number of samples and low efficiency. In order to solve this problem, this study constructs a deep GP (DGP) model by
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Terahertz Sensor Study Based on Spoof Surface Plasmon Polaritons Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-11-12 Ruiqi Zhao; Guizhen Lu; Hongcheng Yin; Jingjing Liang; Dongdong Zeng; Huaibao Xiao
The spoof surface plasmon polaritons (SSPPs) structure can be used as a sensor in THz region for the biosensing. The accuracy of resonance and amplitude for sensor is very important for biosensing. The momentum matching of SSPPs determines the resonance position and the gap distance determines the amplitude. For the biomolecular sensing, the sample is positioned between the prism base and the SSPPs
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A Balun Bandpass Filter to Facilitate the Design of Dual-Polarized Dipole Antenna Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-11-05 He Huang
A dipole antenna based on a balun bandpass filter (BPF) is developed in this paper. The balun BPF employs two U-shaped resonators settled on the left side of the open-circuited transmission line and two L-shaped stubs to produce signals with equal amplitude and inverse phase. In this way, the volume of the balun BPF is reduced by half, and the distance between two output ports is dramatically decreased
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Research on the Impact of Marine Environment on ICPT Transmission Efficiency Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-10-30 Da Li; Wei Gao; Xusheng Wu; Jianxin Gao; Shenqin Yang
ICPT is one of the most influential solutions in the field of wireless power transmission, but it is also very susceptible to the working environment. The complicated marine environment has a great influence on the performance of ICPT. In the deep-sea high-pressure environment, due to the piezomagnetic effect, the magnetic core in the coupling structure will suddenly change the permeability, and the
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Human Body Model for Channel Characterization Based on Ray-Tracing Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-10-27 Lei Xiong; Haiyang Miao; Zhiyi Yao
The propagation channel around human body will fluctuate due to the body effects, so it is essential to investigate the body channel. As an important method of channel modeling, ray-tracing (RT) is affected by the human body model. In this paper, a realistic human body is modeled with the idea of greedy algorithm. Based on the RT simulation and measurement results of path loss (PL), we derive the approximate
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Ultrawideband Harmonic Suppression in Microstrip Patch Antenna Using Novel Defected Ground Structures Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-10-14 Jun Fan; Jiangchuan Lin; Feng Qin; Jinliang Cai; Mingxu Kan
Suppressing higher-order modes up to sixth harmonics of the fundamental working frequency in a single-layer microstrip line-fed patch antenna has been successfully demonstrated. Higher-order modes of the antenna are suppressed by simultaneously employing a circular head open stub connected to the feed line and a novel defected ground structure (DGS) beneath the feed line. The filtering property of
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Miniature Dual-Band Substrate Integrated Waveguide Slotted Antenna Array for Millimeter-Wave 5G Applications Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-10-12 Fei-Peng Lai; Lu-Wu Chang; Yen-Sheng Chen
A compact substrate integrated waveguide (SIW) antenna array that operates at 28 GHz and 38 GHz is proposed for fifth generation (5G) applications. The proposed array consists of four SIW cavities fabricated on one single layer of substrate. Each cavity implements a rhombic slot and a triangular-split-ring slot, resonating on TE101 and TE102 modes at 28 GHz and 38 GHz, respectively. In comparison with
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Synthesis of Uniformly Excited Concentric Ring Arrays by the Strategy of Partial Density Tapering and the Algorithm of Differential Evolution Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-10-10 Xin-Kuan Wang; Gui-Bao Wang; Jianke Jia; Chao-Jun Huang
A new strategy of density tapering called the partial density tapering (PDT) accompanied with the algorithm of differential evolution (DE) is proposed to suppress the peak sidelobe level (PSL) of uniform excited concentric ring arrays (UECRA) with isotropic elements. Through performing the PDT, a sound starting solution for DE can be generated. Then, the ring filling factor (RFF) is introduced so that
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A Second-Iteration Square Koch Fractal Slot Antenna for UHF Downlink Telemetry Applications in CubeSat Small Satellites Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-10-09 Jorge Simon; Jorge Flores-Troncoso; Jose Luis Alvarez-Flores; Leonel Soriano-Equigua; Marco Cardenas-Juarez; Armando Arce; Edgar Briones; Jorge Sosa-Pedroza
This article presents the design, fabrication, and measurement of a square Koch fractal slot antenna for UHF band using both the FR4-G10 and Cuclad 250 substrates. Conveniently, this 56.56 cm full-length antenna possesses a geometry that allows it to be incorporated into the standardized 10 cm × 10 cm faces of the CubeSats. Furthermore, it is shown that both selected substrates exhibit an acceptable
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Single-Fed Broadband CP Bidirectional Antenna with Double-Layer Diagonally Aligned Plates for Universal UHF-RFID Applications Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-10-08 Sitthichai Dentri; Khanet Pookkapund; Bancha Luadang; Prayoot Akkaraekthalin; Chuwong Phongcharoenpanich
This research proposes a single-fed broadband circularly polarized (CP) bidirectional antenna operable in 840–960 MHz frequency band for readers of universal UHF-RFID applications. The proposed antenna is comprised of upper-layer conductor, lower-layer conductor, and wall patches. The upper-layer conductor consists of two diagonally aligned rectangular copper plates with a feeding gap at the center
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Micro-Doppler-Based Space Target Recognition with a One-Dimensional Parallel Network Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-10-05 Lixun Han; Cunqian Feng
Space target identification is key to missile defense. Micromotion, as an inherent attribute of the target, can be used as the theoretical basis for target recognition. Meanwhile, time-varying micro-Doppler (m-D) frequency shifts induce frequency modulations on the target echo, which can be referred to as the m-D effect. m-D features are widely used in space target recognition as it can reflect the
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Periodic Microstrip Leaky Wave Antenna with Double-Sided Shorting Pins and Pairs of Slots Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-09-30 Yahuan Chen; Kuang Wang; Yuanxin Li; Yunliang Long
A backward to forward scanning periodic microstrip leaky wave antenna (MLWA) is presented. The proposed antenna consists of a long rectangular patch with alternating shorting pin on each side, which connects the antenna patch and the ground plane to form periodic shorting circuits. There are two pairs of slots alternately spaced on the long patch to suppress the open stop band (OSB). The OSB problem
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Experiment on Direction of Arrival Estimation of Atmospheric Spark Discharge Plasma Using Combined Time-Domain Antenna Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-09-27 Jiangzehui Yan; Luping Xu; Weihao Tie; Dan Jiang
Apart from interfering in the communication system of an aircraft, electromagnetic pulses (EMPs) radiated from spark discharge plasma, which is generated during high-speed flight, can also be utilized in passive detection. In order to validate this idea, an experiment on direction of arrival (DOA) estimation of a spark discharge plasma target using its radiated EMPs is carried out in this paper. A
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Imaging Algorithm for Sea-Surface Ship Targets Based on Block Sparsity Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-09-22 Zhang Lin; Jiang Yicheng
In this study, a phased array radar was used to accurately image stationary and moving ship targets on the vast sea surface. To solve the challenge in real-time processing of the massive amount of data generated by phased array synthetic-aperture radar imaging, this study leveraged the block sparse characteristics of ships on the sea surface and adopted the joint block orthogonal matching pursuit algorithm
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A Novel 5G LTE Antenna Design for Portable Devices Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-09-21 Wei-Chiang Jhang; Jwo-Shiun Sun
This paper presents the low profile, planar, and small-size antenna design for WWAN, LTE, and 5G (5th generation wireless systems) for use in portable communication equipment. The antenna occupies only 65 × 13 × 0.4 mm3, and the antenna is combined with a 200 × 260 mm2 copper plate to simulated system ground plane. In the low band, a direct-fed right-side arm and a coupled-fed arm implemented can excite
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Metasurface-Based Cylindrical Lenses and Their Antenna Gain Enhancement Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-09-21 Yuping Shang; Wenjun Zhou; Cheng Liao
Electromagnetic metasurface lenses with the characteristic of being conformal to a cylindrical geometry are presented in this study. Based on the formulated principle of the cylindrical metasurface lens operating with transmission or reflection mode, the transmission or reflection phase gradient varying along the circumferential direction of a cylinder is implemented. A focused beam is observed at
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A Compact High-Gain Coplanar Waveguide-Fed Antenna for Military RADAR Applications Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-08-20 Zaheer Ahmed Dayo; Qunsheng Cao; Yi Wang; Sandeep Pirbhulal; Ali Hassan Sodhro
This paper presents a new design of a compact, high-gain coplanar waveguide-fed antenna and proposes a multielement approach to attain enhanced characteristics. The proposed method overcomes the simulation and geometrical complexity and achieves optimal performance features. The antenna prototype is carefully designed, and simulation results have been analyzed. The proposed antenna was fabricated on
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Space-Time Correlation for Three-Dimensional MIMO Channel Model Using Leaky Coaxial Cables in Rectangular Tunnel Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-08-20 Kai Zhang; Fangqi Zhang; Guoxin Zheng
The rapid development of high-speed train and Metro communications has provided new challenges for the application of MIMO technologies. Therefore, we propose a three-dimensional (3D) multiple-input multiple-output (MIMO) channel model using leaky coaxial cable (LCX) in a rectangular tunnel. The channel model is based on geometry-based single-bounce (GBSB) channel model and the electric field distribution
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Maximum Likelihood Angle-Range Estimation for Monostatic FDA-MIMO Radar with Extended Range Ambiguity Using Subarrays Int. J. Antennas Propag. (IF 1.207) Pub Date : 2020-09-08 Kaikai Yang; Sheng Hong; Qi Zhu; Yanheng Ye
In this paper, we consider the joint angle-range estimation in monostatic FDA-MIMO radar. The transmit subarrays are first utilized to expand the range ambiguity, and the maximum likelihood estimation (MLE) algorithm is first proposed to improve the estimation performance. The range ambiguity is a serious problem in monostatic FDA-MIMO radar, which can reduce the detection range of targets. To extend