Decoupling of Closely Spaced Square Patch Antennas Using Short-Circuited λ/2 Microstrip Line

This letter proposes a new decoupling approach to the closely spaced square patch antennas without extra space or additional layer by employing and placing the short-circuited half-wavelength ( λ /2) microstrip line between adjacent antennas. The decoupling mechanism of a cascaded, series resonant,...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2024-02, Vol.23 (2), p.1-5
Main Authors: Liu, Qianwen, Zhu, Lei, Lu, Wen-Jun
Format: Article
Language:English
Subjects:
Closely-spaced
Correlation coefficients
Couplings
Decoupling
Equivalent circuits
Integrated circuit modeling
Microstrip
Microstrip antennas
Microstrip transmission lines
patch antenna
Patch antennas
RLC circuits
short-circuited microstrip line
transmission zero
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Summary:This letter proposes a new decoupling approach to the closely spaced square patch antennas without extra space or additional layer by employing and placing the short-circuited half-wavelength ( λ /2) microstrip line between adjacent antennas. The decoupling mechanism of a cascaded, series resonant, half-wavelength resonator is intuitively revealed by a simple equivalent circuit model. As numerically simulated and experimentally validated, the isolation at the center frequency can be remarkably enhanced from 7.5 dB to 21.3 dB over the entire passband with a close edge-to-edge spacing of 0.034 λ 0 and center-to-center spacing of 0.329 λ 0 . As a result, the simulated and measured in-band envelope correlation coefficients (ECCs) achieve as low as 0.0016 and 0.01, respectively.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2023.3335118