Symmetric/Asymmetric Analysis and Design of Microwave Circuits/Antennas

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: 31 May 2025 | Viewed by 414

Special Issue Editor


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Guest Editor
Key Laboratory of Near-Range RF Sensing ICs & Microsystems, Nanjing University of Science and Technology, Nanjing 210094, China
Interests: antenna theory and design; microwave/millimeter wave devices and circuits; frequency selective structures and LTCC-based millimeter-wave circuits

Special Issue Information

Dear Colleagues,

This Special Issue, entitled “Symmetric/Asymmetric Analysis and Design of Microwave Circuits/Antennas”, aims to explore the significance of symmetric/asymmetric analysis methods and design concepts in advanced multi-function integrated microwave circuits/antennas. Specifically, it delves into novel circuits/antennas integrated with the functionalities of frequency selectivity, power division, phase shifting, balance–unbalance transform, electromagnetic radiation/reception, etc. The contributions will focus on the novel approaches, theoretical frameworks, and practical implementations highlighting the efficiency and advantages of function integrated circuits/antennas in either the symmetric or asymmetric network form. This collection aspires to foster a deeper understanding of function integration concepts, which contribute to high integration, compact size, and low loss circuit/antenna designs in a modern communication system.

Therefore, seeing the potential of symmetric/asymmetric concepts in microwave/millimeter-wave circuit/antenna designs, we would like to present the current advances in this topical field through this Special Issue. Original research articles and reviews are welcome. Research areas related to the topic may include, but are not limited to, the following:

  • Analysis on symmetric/asymmetric microwave network;
  • Broadband, multi-band antenna and circuit;
  • Filtering antenna, power divider, phase shifter;
  • Low RCS antenna;
  • Microwave and millimeter-wave filter;
  • Metamaterials, artificial materials, and frequency selective structures;
  • MIMO, multi-mode, and multi-port antennas;
  • Mutual coupling and decoupling technique;
  • Reconfigurable antennas with multiple functionalities;
  • Reflectionless antenna and filter;
  • Other topics.

Prof. Dr. Jianpeng Wang
Guest Editor

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Keywords

  • antenna
  • function integration
  • microwave component
  • filter
  • power divider
  • phase shifter
  • balun
  • frequency selective surface

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Published Papers (1 paper)

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Research

16 pages, 4503 KiB  
Article
A Design Approach for Asymmetric Coupled Line In-Phase Power Dividers with Arbitrary Terminal Real Impedances and Arbitrary Power Division Ratio
by Yan Zhang, Bin Xia and Junfa Mao
Symmetry 2025, 17(4), 562; https://doi.org/10.3390/sym17040562 - 8 Apr 2025
Viewed by 224
Abstract
In this paper, we first introduced asymmetric coupled lines (ACLs) into both the transmission path and isolation path in traditional in-phase Gysel power dividers and proposed the single-resistor asymmetric coupled line in-phase Gysel power dividers (ACPDs). Utilizing the decoupled branch-line model of ACLs, [...] Read more.
In this paper, we first introduced asymmetric coupled lines (ACLs) into both the transmission path and isolation path in traditional in-phase Gysel power dividers and proposed the single-resistor asymmetric coupled line in-phase Gysel power dividers (ACPDs). Utilizing the decoupled branch-line model of ACLs, a generalized design approach for ACPDs with arbitrary terminal real impedances and arbitrary power division ratio was innovatively proposed. Design formulas relating terminal real impedances, power division ratio, and image impedances of ACLs, for simultaneously satisfying the perfect port isolation and match conditions, are presented. ACPDs achieved a large in-phase power division ratio of 100:1 (20 dB) and offered significant advantages, including impedance transformation, high design freedom, and miniaturization. To automatically determine accurate initial values of geometric parameters for ACLs, a solution software based on MATLAB-HFSS co-simulation and multi-layer perception neural networks was developed, significantly reducing subsequent optimization iterations. To verify the proposed analysis theory and design approach, three ACPDs with different power division ratios of 1:1 (3 dB), 10:1 (10 dB), and 100:1 (20 dB) were implemented. Comparisons of the measured and simulated results showed great accordance, and the three ACPDs achieved good frequency bandwidth, high isolation, excellent port match, and compact size. Full article
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