Minimally Invasive Shorting Technique to Suppress Cross Polarization in Triangular Patch Antennas Using Characteristic Mode Analysis

In this letter, we propose a strategic mechanism to reduce cross polarization (XP) in triangular microstrip antennas. Developed from characteristic mode analysis, it identifies the orthogonal degenerate mode {\rm TM}_{01} as the cross-polarized counterpart of the dominant mode {\rm TM}_{10} and us...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2024-12, Vol.23 (12), p.4723-4727
Main Authors: Samanta, Susamay, Reddy, P Soni, Mandal, Kaushik
Format: Article
Language:English
Subjects:
Antenna radiation patterns
Characteristic mode analysis (CMA)
Cross polarization
cross polarization (XP)
Frequency shift
Metals
Microstrip
Microstrip antennas
microstrip patch antenna
modal near field
Patch antennas
polarization purity
Probes
Resonant frequency
triangular microstrip antenna (TMSA)
Vectors
Citations: Items that this one cites
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Summary:In this letter, we propose a strategic mechanism to reduce cross polarization (XP) in triangular microstrip antennas. Developed from characteristic mode analysis, it identifies the orthogonal degenerate mode {\rm TM}_{01} as the cross-polarized counterpart of the dominant mode {\rm TM}_{10} and uses a pair of partially shorting pins to suppress it effectively. Unlike conventional methods, it is minimally invasive to the antenna cavity, causing minimal resonance frequency shift with no back radiation, and has no significant effect on the desired polarization of radiation. The design achieves low XP levels of −40 dB, −20 dB, and −33 dB in the E-, diagonal, and H-planes, respectively, with a broadside gain of 6.7 dBi.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2024.3467195