Application of Symmetry in Innovative Microwave/Millimeter-Wave/THz Antenna, Circuit and Radar System

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

Deadline for manuscript submissions: closed (30 June 2024) | Viewed by 5587

Special Issue Editors


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Guest Editor
Institute of Electromagnetics and Acoustics, Xiamen University, Xiamen 361005, China
Interests: 5G large-scale millimeter-wave MIMO antennas; millimeter-wave-filtering antennas/chip antennas; multi-band co-aperture base-station antenna arrays; satellite circularly polarized array antennas; RF multi-device collaborative integration design
School of Integrated Circuits, Guangdong University of Technology, Guangzhou 510006, China
Interests: RF integrated circuits; antenna-in-package; active integrated antennas; wireless power transfer; RF front-end circuits; time-modulated metamaterials

Special Issue Information

Dear Colleagues,

Next-generation communication technologies such as 5G, B5G and 6G are among the most important technologies for the future. Advanced antenna and RF front-end systems are key technologies that can meet the demanding requirements for next-generation communications. This Special Issue aims to highlight the application of symmetry in innovative microwave/millimeter-wave/THz antenna, circuit and radar systems. Authors are kindly invited to submit their contributions to this Special Issue on topics including, but not limited to, the following:

  1. Sub-6GHz/mmWave technology for 5G antennas;
  2. Sub-THz technology for 6G antennas;
  3. Active or passive circuits such as filters, power dividers, duplexers, amplifiers, etc.;
  4. Symmetrical metasurfaces or metamaterials applied in innovative antenna designs;
  5. Radar system simulation and waveform design;
  6. LEO satellite antenna arrays/phased arrays.

Dr. Yao Zhang
Dr. Zhixia Du
Guest Editors

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Keywords

  • antenna
  • circuit
  • radar system
  • symmetrical metamaterials
  • satellite phased array

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Published Papers (3 papers)

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Research

11 pages, 11218 KiB  
Article
The Aesthetics and Pragmatics of Symmetry in High-Gain and Wideband Circularly Polarized Antenna Design
by Chunping Liao, Wenyong Liu and Xianjing Lin
Symmetry 2024, 16(8), 1016; https://doi.org/10.3390/sym16081016 - 9 Aug 2024
Viewed by 969
Abstract
In this study, a high-gain broadband circularly polarized crossed dipole antenna is designed. This antenna utilizes two pairs of cross dipoles and a pair of phase delay lines to form circularly polarized radiation. Open-circuit stubs are symmetrically loaded on the four arms of [...] Read more.
In this study, a high-gain broadband circularly polarized crossed dipole antenna is designed. This antenna utilizes two pairs of cross dipoles and a pair of phase delay lines to form circularly polarized radiation. Open-circuit stubs are symmetrically loaded on the four arms of these dipole pairs to introduce new circularly polarized resonating frequencies. Additionally, a symmetrically positioned rectangular ring patch is introduced directly beneath the cross dipoles to generate the third circularly polarized resonating frequency, thereby enhancing the axial ratio bandwidth of the antenna symmetrically. Furthermore, metal posts are symmetrically loaded at the four right angles of the rectangular ring patch to augment the antenna gain, maintaining the overall symmetrical balance crucial for optimal circularly polarized radiation performance. This symmetric design ensures that the antenna achieves a 3dB axial ratio bandwidth of 29.2% (1.9–2.55 GHz) and sustains a gain of 7.5 dB within the passband, showcasing excellent circularly polarized radiation attributes. Full article
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12 pages, 3387 KiB  
Article
A Novel Radar Cross-Section Calculation Method Based on the Combination of the Spectral Element Method and the Integral Method
by Hongyu Zhao, Jingying Chen, Mingwei Zhuang, Xiaofan Yang and Jianliang Zhuo
Symmetry 2024, 16(5), 542; https://doi.org/10.3390/sym16050542 - 1 May 2024
Cited by 1 | Viewed by 1583
Abstract
This article proposes a novel method for calculating radar cross-sections (RCSs) that combines the spectral element method and the integral method, allowing for RCS calculations at any position in a free space or a half-space. This approach replaces the field source with an [...] Read more.
This article proposes a novel method for calculating radar cross-sections (RCSs) that combines the spectral element method and the integral method, allowing for RCS calculations at any position in a free space or a half-space. This approach replaces the field source with an incident field using the scattered field equation of the spectral element method, enabling the arbitrary placement of the field source without being limited by the computational domain. By applying the superposition theorem and the volume equivalence principle, the scattered field of the objects at any position is obtained through integral equations, eliminating limitations on the computation points imposed by the computational domain. Based on Green’s function’s important role throughout the calculation process and its symmetry properties, the RCS calculation of symmetric models will be more advantageous. Finally, several examples, including symmetry models, are provided to validate both the feasibility and accuracy of this proposed method. Full article
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12 pages, 4098 KiB  
Article
Computational Design of an In-Line Coaxial-to-Circular Waveguide Adapter with More Than an Octave Bandwidth
by Erdenesukh Altanzaya, Jiwon Heo, Songyuan Xu, Chan-Soo Lee, Bierng-Chearl Ahn, Sung-Soo Kim and Seong-Gon Choi
Symmetry 2024, 16(3), 304; https://doi.org/10.3390/sym16030304 - 5 Mar 2024
Cited by 2 | Viewed by 2344
Abstract
This paper presents a computer-simulation-based design of an in-line, coaxial-to-circular waveguide adapter for converting the coaxial transverse electromagnetic (TEM) mode to the circular waveguide TE11 mode over more than a one-octave bandwidth. The proposed adapter consists of a coaxial-to-rectangular waveguide transformer employing [...] Read more.
This paper presents a computer-simulation-based design of an in-line, coaxial-to-circular waveguide adapter for converting the coaxial transverse electromagnetic (TEM) mode to the circular waveguide TE11 mode over more than a one-octave bandwidth. The proposed adapter consists of a coaxial-to-rectangular waveguide transformer employing a stepped-ridge converter and a rectangular-to-circular waveguide transformer employing a curved transition. The proposed adapter has been optimized using a commercial simulation tool. The dimensions of the designed adapter are given so that it can be verified by anyone who is interested. The designed adapter operates from 8.00 GHz to 22.95 GHz (2.87:1 bandwidth) with a reflection coefficient of less than −20 dB and a higher-order mode level of less than −25.0 dB. Full article
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