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Electronics
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Novel Microwave/Millimeter-Wave Devices and Antennas
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Novel Microwave/Millimeter-Wave Devices and Antennas

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Microwave and Wireless Communications".

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 14838

Special Issue Editors

Dr. Bian Wu

E-Mail Website
Guest Editor
School of Electronic Engineering, Xidian University, Xi'an 710055, China
Interests: microwave/millimeter wave devices and antennas; artificial electromagnetic materials and devices
Special Issues, Collections and Topics in MDPI journals
Dr. Feng Wei

E-Mail Website
Guest Editor
School of Electronic Engineering, Xidian University, Xi'an 710055, China
Interests: RF/microwave circuits and systems; RFID; low profile reflection array and transmission array design
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

It is our pleasure to invite you to submit papers to this Special Issue of Electronics (MDPI) devoted to the novel microwave/millimeter-wave devices and antennas. As a key component of modern wireless communication systems, microwave/millimeter-wave devices and antennas such as antennas, filters (duplex/multiplexers), couplers, power dividers, as well as metamaterials have always been a research hotspot in the field of communication circuit technology. High frequency, miniaturization, multi-band/multi-mode, low cost, and easy system integration with active devices have become the main research directions. So far, microwave/millimeter-wave technologies have been widely used in the fields of radar, communication, navigation, and medical treatment systems. At the same time, in response to the diversified application requirements of different wireless communication application fields, new passive devices of various structures have been reported, such as artificial dielectric materials, substrate-integrated waveguides (SIW), etc. The purpose of this Special Issue is to comprehensively collect the latest papers dedicated to the theory and application of novel microwave/millimeter-wave devices and antennas. Therefore, we invite qualified scientists in this field to submit their valuable contributions to this Special Issue. Original research works, as well as tutorials and review papers, are welcome. Topics include, but are not limited to the following:

  • 5G/6G wireless or mobile systems;
  • Antenna theory and antenna array techniques
  • RF/microwave/mm-wave components/circuits;
  • Metamaterials/metasurface/smart surface;
  • Artificial dielectric materials, substrate-integrated waveguides (SIW);
  • Artificial Intelligence for RF/wireless/antennas;
  • RF/mm-wave system applications.

Dr. Bian Wu
Dr. Feng Wei
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Electronics is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Antenna/array
  • Filters/multiplexer
  • Microwave/millimeter-wave
  • Coupler/power divider
  • Metamaterial/metasurface

Published Papers (7 papers)

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Research

12 pages, 5095 KiB  
Article
Dual-Polarized Stacked Patch Antenna for Wireless Communication Application and Microwave Power Transfer
by Liangbing Liao, Zhiyi Li, Yuzhu Tang and Xing Chen
Electronics 2021, 10(23), 2988; https://doi.org/10.3390/electronics10232988 - 1 Dec 2021
Cited by 1 | Viewed by 2327
Abstract
In this paper, a dual-polarized stacked patch antenna for wireless communication and microwave power transfer is proposed. The stacked antenna consists of four rectangular apertures that are etched on the ground plane and four identical cross-placed coupling strips that are set on the [...] Read more.
In this paper, a dual-polarized stacked patch antenna for wireless communication and microwave power transfer is proposed. The stacked antenna consists of four rectangular apertures that are etched on the ground plane and four identical cross-placed coupling strips that are set on the upper layer of the ground plane, which are used to excite the top-layer patches. The presented stacked patch antenna was designed as a completely symmetric structure except for the feeding network, resulting in a simple structure and the same radiation patterns for the two polarized ports. The proposed antenna operates at around 5.8 GHz, and the simulation and measured results show that it has a gain of 8.5 dBi and an isolation of 25 dB. The measured antenna efficiency of the two polarized ports at 5.85 GHz was 89.2% and 88.6%, respectively. Finally, a rectifying circuit was designed, and the maximum measured conversion efficiency of the two polarized rectenna was 63.5% and 62.7%, respectively. Full article
(This article belongs to the Special Issue Novel Microwave/Millimeter-Wave Devices and Antennas)
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14 pages, 6073 KiB  
Article
A Novel Simulation Method for Analyzing Diode Electrical Characteristics Based on Neural Networks
by Tao Liu, Le Xu, Yao He, Han Wu, Yong Yang, Nankai Wu, Xiaoning Yang, Xiaowei Shi and Feng Wei
Electronics 2021, 10(19), 2337; https://doi.org/10.3390/electronics10192337 - 23 Sep 2021
Cited by 4 | Viewed by 1649
Abstract
Based on the equivalent circuit model and physical model, a new method for analyzing diode electrical characteristics based on a neural network model is proposed in this paper. Although the equivalent circuit model is widely used, it cannot effectively reflect the working state [...] Read more.
Based on the equivalent circuit model and physical model, a new method for analyzing diode electrical characteristics based on a neural network model is proposed in this paper. Although the equivalent circuit model is widely used, it cannot effectively reflect the working state of diode circuits under the conditions of large injection and high frequency. The analysis method based on physical models developed in recent years can effectively resolve the above shortcomings, but it faces the problem of a low simulation efficiency. Therefore, the physical model method based on neural network acceleration is used to improve the traditional, equivalent circuit model. The results obtained from the equivalent circuit model and the physical model are analyzed using the finite-difference time-domain method. The diode model based on a neural network is fitted with training data obtained from the results of the physical model, then it is summarized into a voltage–current equation and used to improve the traditional, equivalent circuit method. In this way, the improved equivalent circuit method can be used to analyze the working state of a diode circuit under large injection and high frequency conditions. The effectiveness of the proposed model is verified by some examples. Full article
(This article belongs to the Special Issue Novel Microwave/Millimeter-Wave Devices and Antennas)
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13 pages, 4478 KiB  
Article
A Balanced Filtering Directional Coupler with Wide Common-Mode Suppression Based on Slotline Structure
by Luyan Qiao, Rui Li, Ying Han, Feng Wei, Yong Yang, Xiaoning Yang and Nankai Wu
Electronics 2021, 10(18), 2254; https://doi.org/10.3390/electronics10182254 - 14 Sep 2021
Cited by 3 | Viewed by 2269
Abstract
In this paper, a balanced-to-balanced filtering directional coupler (FDC) that can realize a 3 dB coupling degree directional coupler with high isolation and directivity is proposed. The design of the proposed FDC is primarily based on microstrip/slotline transition structures, resonance structures, and odd–even [...] Read more.
In this paper, a balanced-to-balanced filtering directional coupler (FDC) that can realize a 3 dB coupling degree directional coupler with high isolation and directivity is proposed. The design of the proposed FDC is primarily based on microstrip/slotline transition structures, resonance structures, and odd–even mode phase velocity compensation structures. A U-type microstrip feed line integrated with a stepped-impedance slotline resonator is adopted at the input and output ports, which makes the differential-mode (DM) responses independent of the common-mode (CM) ones, and brings superior DM transmission and CM suppression. In addition, by loading the microstrip stub-loaded resonators (SLRs), a DM passband with sharp filtering performance is realized, and transmission zeros (TZs) can be added into the design, which makes it more selective. Moreover, phase compensating slotlines are added into the coupling structure to enhance the isolation. In order to verify the feasibility of the proposed design method, an FDC prototype circuit was made and tested. The simulation results are in good agreement with the measured results. The designed coupler’s DM operating band covers 2.65 GHz to 3 GHz (FBW = 12.4%), and the insertion and return losses are 4.6 dB and 20 dB, respectively. The isolation degree is better than 15 dB, and the CM suppression is more than 55 dB. The total coupler size is about 67.7 mm × 63.8 mm. The designed balanced-to-balanced FDC can be widely used in S-band wireless communication systems. Full article
(This article belongs to the Special Issue Novel Microwave/Millimeter-Wave Devices and Antennas)
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Graphical abstract

10 pages, 30086 KiB  
Article
Array Pattern Synthesis Using a Hybrid Differential Evolution and Analytic Algorithm
by Rui Li, Le Xu, Xiaoqun Chen, Yong Yang, Xiaoning Yang, Jianxiao Wang, Yuanming Cai and Feng Wei
Electronics 2021, 10(18), 2227; https://doi.org/10.3390/electronics10182227 - 11 Sep 2021
Cited by 3 | Viewed by 1802
Abstract
In this paper, a hybrid differential evolution and weight total least squares method (HDE-WTLSM) is proposed for antenna array pattern synthesis. A variable diagonal weight matrix is introduced in total least squares method. Then, the weight matrix is optimized by differential evolution (DE) [...] Read more.
In this paper, a hybrid differential evolution and weight total least squares method (HDE-WTLSM) is proposed for antenna array pattern synthesis. A variable diagonal weight matrix is introduced in total least squares method. Then, the weight matrix is optimized by differential evolution (DE) algorithm to control the differences of the desired level and the obtained level in different directions. This algorithm combines the advantages of evolutionary algorithm and numerical algorithm, so it has a wider application range and faster convergence speed. To compare HDE-WTLSM with DE algorithm and typical numerical algorithms, these methods are applied to a linear antenna array and a conformal truncated conical array. Using our method, lower sidelobe levels and deeper nulls are obtained. The simulation results verify the validity and efficiently of HDE-WTLSM. Full article
(This article belongs to the Special Issue Novel Microwave/Millimeter-Wave Devices and Antennas)
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12 pages, 13248 KiB  
Article
Wideband and High-Gain Wearable Antenna Array with Specific Absorption Rate Suppression
by Haoran Zu, Bian Wu, Peibin Yang, Wenhua Li and Jinjin Liu
Electronics 2021, 10(17), 2056; https://doi.org/10.3390/electronics10172056 - 26 Aug 2021
Cited by 13 | Viewed by 1988
Abstract
In this paper, a wideband and high-gain antenna array with specific absorption rate suppression is presented. By adopting the wideband monopole antenna array and the uniplanar compact electromagnetic band gap (UC-EBG) structure, the proposed wearable antenna array can realize a high gain of [...] Read more.
In this paper, a wideband and high-gain antenna array with specific absorption rate suppression is presented. By adopting the wideband monopole antenna array and the uniplanar compact electromagnetic band gap (UC-EBG) structure, the proposed wearable antenna array can realize a high gain of 11.8–13.6 dBi within the operating band of 4.5–6.5 GHz. The sidelobe level of the proposed wearable antenna array is less than −12 dB, and the cross polarization in the main radiation direction is less than −35 dB. Benefiting from the UC-EBG design, the specific absorption rate is suppressed effectively, guaranteeing the safety of the proposed antenna array to the human body. The proposed antenna array is processed and tested, and the measurement results show good agreement with the simulation results. Full article
(This article belongs to the Special Issue Novel Microwave/Millimeter-Wave Devices and Antennas)
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15 pages, 88423 KiB  
Article
Wideband Frequency Invariant Array Synthesis Based on Matrix Singular Value Decomposition
by Le Xu, Rui Li, Xiaoqun Chen, Feng Wei and Xiaowei Shi
Electronics 2021, 10(16), 2039; https://doi.org/10.3390/electronics10162039 - 23 Aug 2021
Cited by 2 | Viewed by 1846
Abstract
In this paper, an analytic method for frequency invariant (FI) array synthesis is proposed based on matrix singular value decomposition. By grouping the elements of FI array into a few subarrays, the FI pattern in the whole frequency band is realized. Using this [...] Read more.
In this paper, an analytic method for frequency invariant (FI) array synthesis is proposed based on matrix singular value decomposition. By grouping the elements of FI array into a few subarrays, the FI pattern in the whole frequency band is realized. Using this algorithm, the number of sub arrays is reduced. Simulation results show that the proposed algorithm can synthesize the 64-element broadband FI array in 0.52 s. For the 18-element linear array, the half power beam width (HPBW) changes less than 0.6 degrees in the bandwidth. Moreover, the range of HPBW variation decreases rapidly along with the increase in the number of elements. Furthermore, the effectiveness of the algorithm is verified by synthesizing FI array with low side lobe level (SLL), beam scanning, and notch requirements. The examples in this paper show that the proposed algorithm can achieve better pattern characteristics with fewer elements. Finally, a broadband antenna with 2:1 bandwidth is improved, and two FI arrays of 23 elements and 64 elements are formed by using the antenna. The active pattern of the array element is introduced into the proposed algorithm, and two FI arrays synthesized by the algorithm are simulated by full wave software. Full article
(This article belongs to the Special Issue Novel Microwave/Millimeter-Wave Devices and Antennas)
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7 pages, 3250 KiB  
Article
Spoof Surface Plasmon Polaritons Developed from SIW Using Ring Slots and Vias
by Longfei Tan, Kaida Xu, Yiqun Liu, Yingjiang Guo and Jianlei Cui
Electronics 2021, 10(16), 1978; https://doi.org/10.3390/electronics10161978 - 17 Aug 2021
Cited by 5 | Viewed by 1853
Abstract
A new type of spoof surface plasmon polaritons (SSPPs) developed from conventional substrate integrated waveguide (SIW) using ring slots and vias is proposed in this paper. The asymptotic frequency and lower cutoff frequency of the SSPP structure can be easily tuned by changing [...] Read more.
A new type of spoof surface plasmon polaritons (SSPPs) developed from conventional substrate integrated waveguide (SIW) using ring slots and vias is proposed in this paper. The asymptotic frequency and lower cutoff frequency of the SSPP structure can be easily tuned by changing the width of SIW walls and radius of the ring slot, respectively. A trapezoidal microstrip line and a small ring slot are used for the efficient mode conversion to smoothly transit from microstrip line to the proposed SSPP structure. The presented SSPPs have a flat bandpass filtering response with adjustable center frequency and bandwidth. In order to better verify the transmission and cutoff characteristics, two bandpass filters using the proposed SSPPs with relative bandwidths of 61.7% and 76.4%, respectively, are fabricated and measured. Good agreement between the simulations and measurements verifies the proposed design idea. Full article
(This article belongs to the Special Issue Novel Microwave/Millimeter-Wave Devices and Antennas)
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