A New Observation in Decoupling and Sequential Rotation Array Configurations Using Loop Radiation Elements

Kazuhide Hirose (), Koki Nishino and Hisamatsu Nakano
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Kazuhide Hirose: Shibaura Institute of Technology, College of Engineering, Tokyo 135-8584, Japan
Koki Nishino: Shibaura Institute of Technology, College of Engineering, Tokyo 135-8584, Japan
Hisamatsu Nakano: Graduate School of Science and Engineering, Hosei University, Tokyo 184-8584, Japan

J, 2025, vol. 8, issue 1, 1-10

Abstract: Using the method of moments, we analyze three array antennas for low cross-polarized radiation. Each antenna comprises two dual-loop elements connected to a feedline horizontal to the ground plane. First, a feedline end is excited with an unbalanced source as a reference antenna. Next, the feedline center is excited with a balanced source, after the transformation of a decoupling array configuration. It is found that the antenna exhibits a cross-polarized radiation lower by 12 dB than the reference antenna. Last, the decoupling antenna is modified to have an unbalanced source without a complicated balun circuit design. It is pointed out that the modified antenna is an array of four loop elements, sequentially rotated by 90º.

Keywords: array antenna; circular polarization; cross polarization; loop antenna (search for similar items in EconPapers)
JEL-codes: I1 I10 I12 I13 I14 I18 I19 (search for similar items in EconPapers)
Date: 2025
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