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Angle and polarization-independent miniaturized UWB FSS design Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2021-01-08 Yanning Yuan; Yuchen Zhao; Xiaoli Xi
A single-layer ultra-wideband (UWB) stop-band frequency selective surface (FSS) has several advantages in wireless systems, including a simple design, low debugging complexity, and an appropriate thickness. This study proposes a miniaturized UWB stop-band FSS design. The proposed FSS structure consists of a square-loop and metalized vias that are arranged on a single layer substrate; it has an excellent
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Backfire suppressed low profile aperture coupled stacked patch antenna backed by a high impedance surface (HIS) reflector for UHF RFID reader applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2021-01-07 Sangkil Kim
In this paper, a backfire suppressed aperture coupled circularly polarized (CP) stacked patch antenna for universal ultra-high frequency (UHF) radio frequency identification applications is presented. Cross-polarized backfire radiation patterns were successfully suppressed by a planar high impedance surface (HIS) reflector. The size of the fabricated antenna is 250 × 250 × 26.9 mm3 (0.71λ0 × 0.71λ0
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Four-element MIMO antenna for X-band applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2021-01-07 Ali Eslami; Javad Nourinia; Changiz Ghobadi; Majid Shokri
This study presents a new design of a four-element multiple-input multiple-output (MIMO) antenna, which is suitable for X-band applications. The circular polarization (CP) operation in this work is attained by using Tai Chi-shaped patches and L-shaped feeds. The proposed four-element MIMO antenna achieves two resonant frequencies, the first one at around 7.75 GHz and the second one with CP radiation
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Toroidal dipole excitation in cylindrically arranged dogbone metallic inclusions Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2021-01-07 V. P. Sarin; P. V. Vinesh; M. Manoj; C. K. Aanandan; P. Mohanan; K. Vasudevan
A significant excitation of toroidal moments in cylindrically arranged dogbone metallic inclusions is validated and presented in this paper. The antiparallel poloidal currents excited on the front and back faces of the proposed cylindrical dogbone inclusions create strong magnetic field confinement at the center generating intense toroidal moments on the structure. The significant excitation of toroidal
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Design and analysis of 4 × 4 MIMO antenna with DGS for WLAN applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-12-22 K. Malaisamy; M. Santhi; S. Robinson
In this paper, a low profile 4 × 4 multiple input and multiple output (MIMO) antenna is proposed and designed for wireless local area network (WLAN) application using a square split-ring resonator. Initially, a single square-patch antenna is designed with square-shaped split-ring slot. Subsequently, the two-element MIMO antenna is designed and it is extended to four-element MIMO antenna. Finally, the
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Wide-band gain enhancement of a pyramidal horn antenna with a 3D-printed epsilon-positive and epsilon-near-zero metamaterial lens Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-12-18 Nesem Keskin; Sinan Aksimsek; Nurhan Turker Tokan
In this article, we present a simple, low-cost solution for the gain enhancement of a conventional pyramidal horn antenna using additive manufacturing. A flat, metamaterial lens consisting of three-layer metallic grid wire is implemented at the aperture of the horn. The lens is separated into two regions; namely epsilon-positive and epsilon-near-zero (ENZ) regions. The structure of the ENZ region is
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Design of elliptical-shaped reconfigurable patch antenna with shunt capacitive RF-MEMS switch for satellite applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-12-17 Bokkisam Venkata Sai Sailaja; Ketavath Kumar Naik
In this paper, non-uniform meandered line shunt capacitive RF-MEMS switch is presented at an elliptical patch etched with a split-ring resonator (SRR) for satellite communication applications. The non-uniform meander line shunt capacitive is a fixed-fixed type of RF-MEMS switch that is introduced in this model antenna. The proposed antenna design is resonated at 10.46 GHz with the return loss of −37
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5G beamforming techniques for the coverage of intended directions in modern wireless communication: in-depth review Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-12-15 Leevanshi Rao; Mohit Pant; Leeladhar Malviya; Ajay Parmar; Sandhya Vijay Charhate
The growing need of the compact and portable antennas with high speed and low latency wireless communication is the present and future demand of the voice over Internet protocol, on-demand bandwidth, and multimedia applications. Fifth-generation (5G) covers certain low-frequency bands under 6 GHz spectrum, and most of the high-frequency bands under 60 GHz. 5G is the part of the millimeter wave spectrum
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AMC-based antenna sensor for breast tumors detection Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-12-09 Praveen Kumar Rao; Ashish Ranjan Yadav; Rajan Mishra
The artificial magnetic conductor (AMC) formed by meta-materials is used in the micro-strip antenna design for microwave sensor applications. The AMC structures with two uniplanar layers, which include modified square split-ring resonator cells, are repeated and formed into a 5 × 3 array. The antenna's operational bandwidth result is significant, and it is in the range of 2.8–10 GHz with a maximum
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A compact UWB antenna with triple band notch reconfigurability Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-12-07 Lei Li; Jingchang Nan; Jing Liu; Chengjian Tao
A compact ultrawideband (UWB) antenna with reconfigurable triple band notch characteristics is proposed in this paper. The antenna consists of a coplanar waveguide-fed top-cut circular-shaped radiator with two etched C-shaped slots, a pair of split-ring resonators (SRRs) on the backside and four p-type intrinsic n-type (PIN) diodes integrated in the slots and SRRs. By controlling the current distribution
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Modified Koch curve broadband fractal antenna for spectrum sensing in cognitive radio Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-12-03 Monika Aggarwal; Amar Partap Singh Pharwaha
This paper presents the design and development of broadband modified Koch curve microstrip patch antenna with multiband characteristics for spectrum sensing in cognitive radio applications. The proposed spectrum sensing antenna is designed specifically for its efficient operation in the spectrum (1.683–3.05, 4.246–9.714, and 11.25–18 GHz) specified for L, S, C, X, Ku with broadband characteristics
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Radiation characteristics of microstrip antenna on frequency selective surface absorbing layer Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-12-03 Ashish Raj; Nisha Gupta
The radiation characteristics of the microstrip antenna (MSA) on the frequency selective surface (FSS) based absorbing layer is presented in this paper. It is observed that an absorbing layer placed between the MSA configuration and the ground plane helps in controlling the radiation characteristics of the antenna. It not only reduces the back lobe but also reduces the beamwidth and gain of the antenna
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A compact polarization reconfigurable stacked microstrip antenna for WiMAX application Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-11-27 Murari Shaw; Niranjan Mandal; Malay Gangopadhyay
In this paper, a stacked microstrip patch antenna with polarization reconfigurable property has been proposed for worldwide interoperability for microwave access (WiMAX) application. The proposed antenna has two substrate layers: upper and lower layers with two radiating patches connected with the coaxial probe. Without the upper layer the lower square-shaped substrate layer having regular hexagonal
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Compact wideband folded strip monopole antenna for brain stroke detection Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-11-27 Payal Bhardwaj; Ritesh Kumar Badhai
This paper introduces the CPW fed monopole antenna operating at multiple frequencies covering Ultra High Frequency (UHF) bands, suitable for biomedical applications. The planar antenna structure comprises an open loop and a dual folded monopole of optimized length. The antenna exhibits ultra-wideband frequency of operation ranges from 740 MHz to 4.02 GHz covering the frequency bands suitable for head
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Study of effective permittivity for a multilayer substrate dipole antenna Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-11-27 Julien Moussa H. Barakat; Fabien Ndagijimana
The design of integrated systems requires the knowledge of the values of the effective permittivity of the substrate. Designing antenna using computer-aided design tools is a long process that necessitates doing iterative steps to find the correct dimensions that meet specific requirements at a certain operating frequency. The objective of this work is to propose an analytic model to reduce the time
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A miniaturized flexible frequency selective surface for dual band response Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-11-26 Durai Kanchana; Sankararajan Radha; Balakrishnapillai Suseela Sreeja; Esakkimuthu Manikandan
In this paper, a novel miniaturized and flexible dual band frequency selective surface (FSS) is presented. This FSS provides effective shielding in X-band and Ku- band, with a frequency response of 9.4 and 16.7 GHz, respectively. The proposed FSS provides 924 MHz bandwidth at X-band and 1.34 GHz bandwidth at Ku-band with an insertion loss of 20 dB. Moreover, the proposed design is polarization-independent
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A superstrate loaded aperture coupled dual-band circularly polarized dielectric resonator antenna for X-band communications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-11-26 Sounik Kiran Kumar Dash; Qingsha S. Cheng; Taimoor Khan
A superstrate loaded cylindrical dielectric resonator antenna is developed and demonstrated for dual-band circular polarization. The proposed antenna employs a microstrip-fed rotated cross-shaped slot coupling technique for exciting the dielectric resonator (DR). The design is developed in a straight forward way. Firstly, the DR is coupled with a conventional plus-shaped slot and operates in linear
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Investigation of organic corn husk-based flat microwave absorber Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-11-23 Soumya Sundar Pattanayak; Shahedul Haque Laskar; Swagatadeb Sahoo
Design and development of cheap and eco-friendly microwave absorber are one of the challenging and interesting topics for the scientific community nowadays. This paper proposes the design and fabrication of corn husk-based low cost, light-weight, and flexible microwave absorber treated as a promising eco-friendly microwave absorber. In this work, an extensive study on microwave absorption efficiency
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A new path loss model based on the volumetric occupancy rate for the pine forests at 5G frequency band Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-11-20 Abdullah Genc
In this paper, a new empirical path loss model based on frequency, distance, and volumetric occupancy rate is generated at the 3.5 and 4.2 GHz in the scope of 5G frequency bands. This study aims to determine the effect of the volumetric occupancy rate on path loss depending on the foliage density of the trees in the pine forest area. Using 4.2 GHz and the effect of the volumetric occupancy rate contributes
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Determining the input reflection coefficient of integrated antennas using over-the-air measurements under near-field conditions Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-11-19 A.J. van den Biggelaar; D.P.P. Daverveld; A.C.F. Reniers; A.B. Smolders; U. Johannsen
One of the current trends in the integrated circuit (IC) development is the integration of antennas on-chip or in the package of the IC. This poses challenges in the production testing process of the packaged IC, as the antenna functionality has to be included and at least one of the signal ports cannot be accessed at a conducted manner. In order to measure the reflection coefficient of an integrated
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Low-loss and tunable millimeter-wave filters using spherical dielectric resonators Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-11-19 Utpal Dey; Julio Gonzalez Marin; Jan Hesselbarth
Millimeter-wave band-pass filters using spherical dielectric resonators are presented. The dielectric spheres are sandwiched between metal plates and are excited by a simple microstrip line structure on a thin-film circuit board. As such, these filters could also be implemented in the back-end-of-line layers of an integrated circuit. A single resonator, based on a diameter 0.6 mm alumina ceramic sphere
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Compact stack EBG structure for enhanced isolation between stack patch antenna array elements for MIMO application Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-11-18 Mahesh B. Kadu; Neela Rayavarapu
In this research article, a compact wideband stack patch antenna array integrated with compact stack electromagnetic band gap (EBG) structure for multiple input multiple output (MIMO) application is proposed. The wide resonance bandwidth is achieved at 2.45 GHz band by stack arrangement of compact meander line slot driven and parasitic patch elements. The isolation bandwidth is matched with resonance
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Dual-/tri-band bandpass filters with fully independent and controllable passband based on multipath-embedded resonators Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-09-30 Yang Xiong; Wei Zhang; Yue-Peng Zhong; Li-Tian Wang
In this paper, dual-band and tri-band bandpass filters (BPFs) with fully independent and controllable passbands based on multipath-embedded resonators are presented. The dual-band BPF consists of two double open-ended stub-loaded terminal-shorted resonators (DOESL-TSRs) with a common via-hole connected along the symmetric plane of the filter. Based on DOESL-TSRs, a triple open-ended stub-loaded terminal-shorted
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Planar suspended line technique based UWB-MIMO antenna having dual-band notching characteristics Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-11-09 Kirti Vyas; Rajendra Prasad Yadav
This communication reports significant isolation improvement utilizing planar suspended line (PSL) technique in ultra wideband (UWB) antenna for Multiple Input Multiple Output (MIMO) application. The antenna exhibits dual-band notched characteristic in Wireless Local Area Network (WLAN) band covering 5.45–5.85 GHz range; and in 7.15–7.95 GHz range for X-band downlink operations in satellite communication
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Synthesis technique of a low-profile multiple sub-beam phased array antenna for high-throughput satellite applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-11-06 Elham Sharifi Moghaddam; Arash Ahmadi
Sub-beam concept is very useful for size reduction of multiple beam phased array antenna (PAA) systems that are applied for high-throughput communication satellites. In this paper, the synthesis procedure for a PAA with multiple sub-beams in two dimensions of the coverage domain is proposed and analyzed. In the design procedure, the interleaved sub-arraying technique has been applied to eliminate the
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A novel design of ultra-wide stop-band single-layer frequency selective surface using square-loop and cross Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-11-04 Amit Birwal; Sanjeev Singh; Binod Kumar Kanaujia
In this paper, a novel design of ultra-wide stop-band single-side single-layer frequency selective surface (FSS) is presented. The unit cell of the proposed FSS is designed using the combination of conventional square loop and cross (CSLC). To enhance the bandwidth of this structure, an additional cross is inserted in all the four quadrants of CSLC. The stop-band transmission bandwidth assuming −10
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Vivaldi antennas: a historical review and current state of art Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-10-21 Anindita Bhattacharjee; Abhirup Bhawal; Anirban Karmakar; Anuradha Saha; Diptendu Bhattacharya
The progressions in the field of wireless technology can be highly attributed to the development of antennas, which can access high data rates, provide significant gain and uniform radiation characteristics. One such antenna called the Vivaldi antenna has attracted the utmost attention of the researchers owing to its high gain, wide bandwidth, low cross-polarization, and stable radiation characteristics
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A compact band-notched antenna with high isolation for UWB MIMO applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-10-20 Issmat Shah Masoodi; Insha Ishteyaq; Khalid Muzaffar; M. Idrees Magray
A compact antenna module with a single band notch at wireless local area network (WLAN) (5.725–5.825 GHz) for ultra-wideband (UWB) multiple input multiple output (MIMO) applications is proposed. Proposed antenna which acquires size of 0.299 λ × 0.413 λ × 0.005 λ mm3 at 3.1 GHz consists of two symmetrical radiators placed side by side on global merchandise link (GML) 1000 substrate (εr = 3.2, tan δ
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Dual-band B-shaped antenna array for satellite applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-10-19 Muhammad Mateen Hassan; Muzhair Hussain; Adnan Ahmed Khan; Imran Rashid; Farooq Ahmed Bhatti
The paper presents a 1 × 2 B-shaped antenna array for dual-band operation at 4 and 8 GHz. The antenna design consists of a rectangular patch with two annular-strip lines fabricated on the top layer and finite ground plane on the bottom layer. The array is formed by designing an optimum T-shaped microstrip line for impedance matching. The dimensions of the antenna array are 78 × 36 × 1.6 mm3. Full-wave
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Graphene-based microwave coaxial antenna for microwave ablation: thermal analysis Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-10-19 Burak Uzman; Adem Yilmaz; Hulusi Acikgoz; Raj Mittra
In this study, the problem of backward heating in microwave ablation technique is examined and an electromagnetic solution based on the use of high impedance graphene material is presented for its mitigation. In this context, a one-atom-thick graphene layer is added on the coaxial double slot antenna. In addition to the electromagnetic behavior, thermal effects caused by the graphene-covered antenna
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Employing higher order modes in a broadband SIW sensor for permittivity measurement of medium loss materials Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-10-14 Kianoosh Kazemi; Gholamreza Moradi; Ayaz Ghorbani
In this paper, a novel SIW microwave sensor is designed to accurately determine the broadband complex permittivity of medium loss and dispersive liquids using a number of higher order modes in 11–20 GHz. To achieve a higher accuracy in characterization, the sensor is equipped with some methods such as Photonic Band Gap method, slow-wave via, and a new feedline, which enhances the quality factor for
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A fully-textile wideband AMC-backed antenna for wristband WiMAX and medical applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-10-14 Mohamed El Atrash; Mahmoud A. Abdalla; Hadia M. Elhennawy
Proposed is a wideband, low profile, fully flexible, and all-textile-based slotted triangular antenna loaded with a 2 × 2 textile-inspired artificial magnetic conductor to be worn on the wrist. The integrated antenna design is designed to cover the frequency band from 3.1 to 6.5 GHz. The integrated design has two main resonances, where the first one is at 3.5 GHz, which can serve the WiMAX communication
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Machine learning-based broadband GaN HEMT behavioral model applied to class-J power amplifier design Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-10-14 Jialin Cai; Justin King; Shichang Chen; Meilin Wu; Jiangtao Su; Jianhua Wang
A novel, broadband, nonlinear behavioral model, based on support vector regression (SVR) is presented in this paper. The proposed model, distinct from existing SVR-based models, incorporates frequency information into its formalism, allowing the model to perform accurate prediction across a wide frequency band. The basic theory of the proposed model, along with model implementation and the model extraction
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Compact quintuple notched-band UWB BPF with high selectivity and wide bandwidth Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-10-12 Lei Bai; Yiqi Zhuang; Zhibin Zeng
In this paper, a compact quintuple notched-band ultra-wideband bandpass filter with high selectivity and wide bandwidth is proposed. The filter adopts an approximate closed-loop C-shaped stepped impedance resonator to generate triple notched bands, and uses Hilbert fractal curve slit and L-shaped resonator to create single notched band, respectively. Multiple notched-band are centered at 5.29, 6.61
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Compact multimode-resonator multiplexer with wide upper-stopband and high isolation Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-09-30 Kaijun Song; Mou Luo; Cuilin Zhong; Yuxuan Chen; Yedi Zhou; Fei Xia
A miniaturized high-isolation quadplexer with wide upper-stopband based on open and short stub-loaded multimode-resonator is proposed in this paper. Based on the theory of multimode-resonator and stepped impedance resonator (SIR), the compact quadplexer is designed by using multimode-resonator and SIR. In order to further miniaturize the size of the circuit, the multimode resonator is employed as the
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A multi-slotted antenna for LTE/5G Sub-6 GHz wireless communication applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-09-29 Rezaul Azim; AKM Moinul H. Meaze; Adnan Affandi; Md Mottahir Alam; Rumi Aktar; Md S. Mia; Touhidul Alam; Md Samsuzzaman; Mohammad T. Islam
This paper presents a low-profile multi-slotted patch antenna for long term evolution (LTE) and fifth-generation (5G) communication applications. The studied antenna comprised of a stepped patch and a ground plane. To attain the required operating band, three slots have been inserted within the patch. The insertion of the slots enhances the capacitive effect and helps the prototype antenna to achieve
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A miniaturized tri-band bandpass microstrip filter using multiple resonators with sharp skirts Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-09-24 Chenhao Wang; Xiaoli Xi; Yuchen Zhao; Xiaomin Shi
In this paper, a miniaturized tri-band bandpass microstrip filter using stub loaded rectangular ring resonator (SLRRR),shorted stub loaded stepped impedance resonators (SSLSIR), and stepped impedance resonators (SIR) with sharp skirts is presented. Two SSLSIRs are embedded paralleled inside SLRRR to generate a quasi-elliptic response at second and third passband. The odd-even fundamental resonant mode
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Bandwidth enhancement of compact patch antennas by loading inverted “L” and “T” strips Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-09-15 Abdelheq Boukarkar; Rachdi Satouh
We propose simple designs of compact patch antennas with bandwidth enhancement. Firstly, an inverted “L” strip is loaded onto the corner of one radiating patch edge to create an additional resonant mode which can be combined with that one of the conventional patch to enhance the operating bandwidth. Secondly, the “L” strip is replaced by inverted “T” strip to improve further the bandwidth by creating
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Experimental verification of super-compact ultra-wideband (UWB) polarization and incident angle-independent metamaterial absorber Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-09-15 Manpreet Kaur; Hari Shankar Singh
In this paper, a super-compact ultra-wideband (UWB) metamaterial absorber (MMA) is presented. The absorber design consists of an inverted L-shaped structure and a diagonal rectangular-shaped structure. The capacitive coupling between these two structures not only provides UWB nature but also provides a super-compact absorber design. The dimension of the unit cell arrangement is 5 × 5 mm2 and printed
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A compact double-band planar printed slot antenna for sub-6 GHz 5G wireless applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-09-14 Insha Ishteyaq; Issmat Shah Masoodi; Khalid Muzaffar
A planar rectangular slot antenna with dual-band operation and realized higher peak gain is proposed, designed, and fabricated for sub-6 GHz 5G applications. The antenna possesses a rectangular radiating slot with the inverted stub on its upper edge excited simultaneously by a micro-strip feed line having a double folded T-shaped structure. The fabricated design is of compact size with the radiating
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Binomial stub loaded compact Vivaldi antenna for superwideband applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-09-09 Abhik Gorai; Rowdra Ghatak
A compact antipodal Vivaldi antenna with superwideband characteristics is presented in this paper. For improved matching of input impedance at lower frequency region, techniques like binomial tapering of outer edges, binomial slit loaded outer edge, and protruded binomial tapered stub loading have been adopted. The antenna operates in a wide frequency range from 2 to 20 GHz. Experimental results show
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Compact dual-/tri-/quad-band bandpass filters with independently frequency-tunable and switchable passbands Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-09-09 Zhao Li; Litian Wang; Ming He; Xiaqing Li; Zhelong Liang; Zhipeng Wang
This paper presents the design of frequency-tunable dual-band, tri-band and quad-band bandpass filters (BPFs). The proposed three BPFs can be independently tuned and individually switched by varying the capacitances of the varactors. In the designed tunable dual-band BPF (TD-BPF), common input/output feed lines are utilized for two tunable dual-mode resonators (TDRs). Further, three TDRs and four TDRs
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Experimental evaluation of real-time sigma-delta radio over fiber system for fronthaul applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-09-09 Muhammad Usman Hadi; Hyun Jung; Pier Andrea Traverso; Giovanni Tartarini
Sigma-delta radio over fiber (ΣΔ-RoF) is an expedient technology for next-generation networks including 5G cloud/centralized radio access networks (C-RAN). In this article, we demonstrate a realistic experimental scenario for ΣΔ-RoF link targeting C-RAN fronthaul applications, by using baseband second-order 1-bit sigma-delta modulation (ΣΔ-M). The experimental set-up validates the LTE 20 MHz signals
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A millimeter-wave fundamental and subharmonic hybrid CMOS mixer for dual-band applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-09-09 Fang Zhu; Guo Qing Luo
This paper proposes and presents a millimeter-wave (MMW) fundamental and subharmonic hybrid mixer in a 65-nm CMOS technology. Based on a hybrid structure with two switching quads and a quasi-diplexer, the proposed circuit can function either as a fundamental mixer (FM) or a subharmonic mixer (SHM) for dual-band applications. An application of the MMW hybrid mixer in a concurrent dual-band receiver
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Rollable metamaterial screen for magnetic resonance coupling-based high-efficiency wireless power transfer Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-09-09 Woosol Lee; Yong-Kyu Yoon
This paper presents a rollable metamaterial screen for high-efficiency wireless power transfer (WPT) system based on magnetic resonance coupling, which operates at 4.5 MHz. The rollable metamaterial screen with a fully expanded area of 750 mm × 750 mm is located in the middle between transmitter and receiver coils and focuses the magnetic field and, by such a way, significantly improves power transfer
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Analysis of high-order sub-harmonically injection-locked oscillators Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-06-25 Silvia Hernández; Mabel Pontón; Sergio Sancho; Almudena Suárez
High-order sub-harmonically injection-locked oscillators have recently been proposed for low phase-noise frequency generation, with carrier-selection capabilities. Though excellent experimental behavior has been demonstrated, the analysis/simulation of these circuits is demanding, due to the high ratio between the oscillation frequency and the frequency of the input source. This work provides an analysis
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Distortion mitigation for 100 and 250 MHz discrete supply modulation of a three-stage K-band MMIC PA Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-07-01 Maxwell Robert Duffy; Gregor Lasser; Zoya Popović
This paper presents a high-efficiency linear GaN K-band transmitter for broadband high peak-average power ratio (PAPR) signals. A GaN MMIC 18.5–24 GHz three-stage power amplifier with over 4 W peak output power, 20 dB saturated gain, and 40% peak PAE is supply-modulated with a four-level discrete dynamic supply GaN MMIC. For 100 MHz signals with ${\rm PAPR}\gt 10\, {\rm dB}$ , we demonstrate an average
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OFDM waveform for distributed radar sensing in automotive scenarios Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-07-01 Steffen Schieler; Christian Schneider; Carsten Andrich; Michael Döbereiner; Jian Luo; Andreas Schwind; Reiner S. Thomä; Giovanni Del Galdo
In this paper, an orthogonal frequency-division multiplexing (OFDM) waveform radar sensing approach is demonstrated based on field measurements at C-band. We demonstrate a concept that is based on the exploitation of typical wireless communication transmissions to perform passive, distributed radar sensing. Our concept is based on an OFDM radar that operates in the modulation symbol domain and can
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Techniques for the generation of multiple additional transmission zeros in H-plane waveguide filters Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-06-24 Daniel Miek; Patrick Boe; Fynn Kamrath; Michael Höft
In this paper, different techniques for the generation of additional transmission zeros (TZs) in planar waveguide filters are investigated. In the classical theory, TZs are generated only by destructive interference of non-adjacent cavities, limiting the available number of TZs to the filter order itself. However, more approaches for the generation of TZs are known, including bypass-coupling in oversized
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Design of a miniature dual-band bandpass filter with interlocked stepped-impedance resonators for 5G new radio access technology Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-07-30 Wei-Lun Hsu; Pei-Yu Lyu; Sheng-Fuh Chang
A miniature dual-band bandpass filter with interlocked stepped-impedance resonators (SIRs) is presented in this paper, which was designed for the student design competition held in European Microwave Week 2019. This bandpass filter is required to have two concurrent passbands, namely, the first passband at 900–1000 MHz and the second passband at 1427–1518 MHz bands, which cover six designated bands
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Compact CPW-fed super wideband planar elliptical antenna Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-09-01 Umair Rafique; Sami ud Din; Hisham Khalil
A compact co-planar waveguide (CPW) fed planar elliptical antenna has been designed and presented for super wideband (SWB) characteristics. The designed antenna has an overall size of 30 × 30 × 1.57 mm3, and it consists of an elliptical patch radiator fed using a modified 50 Ω CPW-fed tapered microstrip feed line. By using a semi-ring shaped structure with a tapered feed line, an impedance bandwidth
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Dynamic behavioral modeling of RF power amplifiers based on decomposed piecewise machine learning technique Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-08-28 Jialin Cai; Justin B. King; Chao Yu; Baicao Pan; Lingling Sun; Jun Liu
Multi-device radio frequency power amplifiers (PAs) often exhibit strongly non-linear behavior in combination with long-term memory effects, leading to an extremely challenging model development cycle. This paper presents a new, dynamic, behavioral modeling technique, based on a combination of the real-valued decomposed piecewise method and concepts from the field of machine learning. The underlying
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Analysis and design of inclined fractal defected ground-based circularly polarized antenna for CA-band applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-08-27 Sonal Gupta; Shilpee Patil; Chhaya Dalela; Binod Kumar Kanaujia
Design of single-feed circularly polarized (CP) microstrip antenna is proposed in this article. The design employs the concept of E-shape patch with inclined fractal defected ground structure (IFDGS), which can improve the impedance bandwidth, gain, and axial ratio (AR) bandwidth. The excellent enhanced impedance bandwidth, axial ratio bandwidth, and gain are achieved by an inclined E-shaped fractal
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Periodic printed semi-annular substrate loaded TM01–TE11 mode converter Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-08-26 Ashish Chittora; Swati Varun Yadav
A mode converter design using the concept of periodic substrates loading in a circular waveguide, to convert TM01 mode to TE11 mode is presented in this paper. The detailed design principle, simulation, and measurement results are included in this study. Simulation results show that the purity of output fundamental TE11 mode of the converter approaches 99.2% for an operating frequency of 3.2 GHz. The
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A 31 GHz body-biased configurable power amplifier in 28 nm FD-SOI CMOS for 5 G applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-08-25 Florent Torres; Eric Kerhervé; Andreia Cathelin; Magali De Matos
This paper presents a 31 GHz integrated power amplifier (PA) in 28 nm Fully Depleted Silicon-On-Insulator Complementary Metal Oxide Semiconductor (FD-SOI CMOS) technology and targeting SoC implementation for 5 G applications. Fine-grain wide range power control with more than 10 dB tuning range is enabled by body biasing feature while the design improves voltage standing wave ratio (VSWR) robustness
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Switchable design of a frequency reconfigurable broadband whip antenna in high frequency Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-08-24 Hengfeng Wang; Chao Liu
In this paper, the antenna reconfigurable technology is used to redesign a whip antenna in different sub-bands of high frequency (HF). According to the electrical characteristics of the antenna, on the one hand, two different radiation whip heights are designed to solve the problem of pattern up-warping in the high-frequency band; on the other hand, a common upper loading network and several different
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A planar triple-band monopole antenna loaded with an arc-shaped defected ground plane for WLAN/WiMAX applications Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-08-20 Shiquan Wang; Fanmin Kong; Kang Li; Liuge Du
In this paper, a new printed triple-band planar antenna combing two different modified monopoles and an arc-shaped defected ground plane is proposed and studied. The used two simple monopoles consist of a rectangular ring and a rectangular patch attached a straight metal strip. And a compact arc-shaped defected ground structure is proposed and used to excite higher resonance frequency and improve the
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High selectivity wideband 180° phase shifters with the functionality of vertical transition Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-08-19 Yu Zhu; Kaijun Song; Yong Fan
In this paper, a high selectivity wideband 180° phase shifter (PS) with the functionality of vertical transition is presented. The whole circuit is realized based on the hybrid microstrip/slotline (SL) structure. By introducing the short-circuited microstrip stepped-impedance resonators, two transmission zeros are created to improve the selectivity of the PS. With the SL in the center ground layer
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A simple method to simultaneously increase the gain and bandwidth of wearable antennas for application in medical/communications systems Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-08-13 Farzad Khajeh-Khalili; Ali Shahriari; Fatemeh Haghshenas
In this paper, a simple and efficient method to increase the gain and bandwidth of the wearable antennas used in several medical/communications systems is presented. To increase the gain and bandwidth simultaneously, the triple transmission lines (TTLs) method has been used. With this method, the frequency ranges of 1.7–2.5 and 5.4–5.95 GHz are covered with dual-band responses. Also, the simulated
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Quasi-elliptic dual-band bandpass filters based on series-cascaded multi-resonant cells Int. J. Microw. Wirel. Technol. (IF 0.939) Pub Date : 2020-06-22 Andrea Ashley; Dakotah J. Simpson; Dimitra Psychogiou
This paper reports on quasi-elliptic dual-band bandpass filters (BPFs) that were designed for the Filter Student Design Competition of the 2019 European Microwave Week. The proposed lumped-element (LE) BPF concept is based on two dual-band transversal cells and one multi-resonant cell that allow the realization of symmetric and asymmetric dual-band transfer functions shaped by six poles and five transmission