Low-profile Dual-polarized Filtering Antenna with Improved Gain and Impedance Bandwidth using Characteristic Mode Analysis

Authors

  • Zong-Zhuo Wang National Key Laboratory of Antennas and Microwave Technology Xidian University, Xi’an, 710071, China
  • Neng-Wu Liu National Key Laboratory of Antennas and Microwave Technology Xidian University, Xi’an, 710071, China
  • Liang Fang Aviation Key Lab of Science and Technology on High Performance Electromagnetic Windows AVIC Research Institute for Special Structures of Aeronautical Composites, Ji’nan, Shandong, 250023, China

DOI:

https://doi.org/10.13052/2023.ACES.J.381003

Keywords:

Characteristic mode analysis (CMA), filtering response, high-gain, low-profile, non-filtering scheme

Abstract

A low-profile dual-polarized filtering microstrip patch antenna (MPA) with improved gain and bandwidth is realized without requirement of filtering circuit. Herein, the characteristic mode analysis (CMA) method is adopted to analyze the antenna performances. Initially, the resonant modes of the MPA are deeply analyzed, which indicates that its resonant frequencies of CM1 and CM3 could be moved close to each other by loading slots and shorting pins, thus broadening the impedance bandwidth. Then, the influence of the slots on radiation patterns of the antenna is further studied. The results demonstrate that the non-broadside radiation beam of its CM1 could be reshaped as the broadside beam, and the sidelobe level of its CM3 could be reduced by cutting the slots, leading to the improved gain. After that, the effect of the pins on the gain-response is investigated, It shows that the gain nulls of the MPA could be controlled at both lower and upper bands, especially for the non-filtering scheme. Finally, the proposed dual-polarized antenna is fabricated and tested. The results prove that its impedance bandwidth reaches to about 7.4% with a low-profile of about 0.038 free-space wavelength. Besides, a stable enhanced gain of around 10 dBi is achieved over the operating band.

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Author Biographies

Zong-Zhuo Wang, National Key Laboratory of Antennas and Microwave Technology Xidian University, Xi’an, 710071, China

Zong-Zhuo Wang was born in Liaocheng, China. He is currently pursuing the M.E degree from Xidian University, Xi’an, China. His current research interests include low-profile antennas, filtering antennas, and multifunctional antennas.

Neng-Wu Liu, National Key Laboratory of Antennas and Microwave Technology Xidian University, Xi’an, 710071, China

Neng-Wu Liu was born in Changde, China. Since 2018, he has been an associate professor with Xidian University. His current research interests include the designs of antenna theory, low-profile antennas, multimode antennas, wideband antennas, patch antennas, filtering antennas, and phased arrays.

Liang Fang, Aviation Key Lab of Science and Technology on High Performance Electromagnetic Windows AVIC Research Institute for Special Structures of Aeronautical Composites, Ji’nan, Shandong, 250023, China

Liang Fang was born in 1986, and he is a senior engineer at the AVIC Research Institute for Special Structures of Aeronautical Composites. His current research focuses on radio propagation and comprehensive design of electromagnetic windows.

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Published

2023-10-31

How to Cite

[1]
Z.-Z. Wang, N.-W. Liu, and L. Fang, “Low-profile Dual-polarized Filtering Antenna with Improved Gain and Impedance Bandwidth using Characteristic Mode Analysis”, ACES Journal, vol. 38, no. 10, pp. 767–773, Oct. 2023.

Issue

2023: Vol 38 Iss 10

Section

Mode-inspired antennas/circuits for 5G/6G applications

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