A VHF/UHF Low Profile Miniaturized Vertically Polarized Antenna for Airborne Communications

被引：0
|
作者：
Wang Y.-P. [1 ]
Ban Y.-L. [1 ]
Sun Q. [1 ]
Hu J. [1 ]
机构：
[1] School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Sichuan, Chengdu
来源：
Tien Tzu Hsueh Pao/Acta Electronica Sinica | 2023年 / 51卷 / 10期
基金：
中国国家自然科学基金;
关键词：
cylindrical cavity; low profile; miniaturization; omnidirectional antenna; vertical polarization;
D O I：
10.12263/DZXB.20220221
中图分类号：
学科分类号：
摘要：
In the field of airborne communications, there is an urgent need for a low-profile miniaturized antenna with vertically polarized omnidirectional radiation patterns, especially in VHF and UHF bands. To satisfy this requirement, a cylindrical cavity antenna with a low profile and electrically small size is proposed in this paper. By introducing two short-circuited columns and a conductive column into the cylindrical cavity to excite the TM01 and TM02 modes, respectively, good vertical polarization omnidirectional radiation patterns can be obtained. A tapered sleeve is introduced to improve the input impedance and effectively reduce the resonant frequencies of the TM01 and TM02 modes so that the resonant frequencies of the two modes can work in the target frequency band. Besides, a broadband matching network with four states is designed to further improve the impedance matching of the proposed antenna. The size of the proposed cylindrical cavity antenna is π ×(0.11λmax)2 × 0.045λmax (λmax is the free space wavelength at the lowest frequency). There is good agreement between the simulated and measured results. The measured results show that the proposed cylindrical cavity antenna achieves 47.3% (105~170 MHz) and 52.3% (207~355 MHz) impedance bandwidth in the low-frequency band and high-frequency band (| S11 | < -10 dB), respectively, and a stable vertical polarization omnidirectional radiation pattern is demonstrated in the wide frequency band. © 2023 Chinese Institute of Electronics. All rights reserved.
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页码：2754 / 2764
页数：10
相关论文
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