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Article

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

by
Kazuhide Hirose
1,*,
Koki Nishino
1 and
Hisamatsu Nakano
2
1
Shibaura Institute of Technology, College of Engineering, Tokyo 135-8584, Japan
2
Graduate School of Science and Engineering, Hosei University, Tokyo 184-8584, Japan
*
Author to whom correspondence should be addressed.
J 2025, 8(1), 9; https://doi.org/10.3390/j8010009
Submission received: 25 December 2024 / Revised: 10 February 2025 / Accepted: 20 February 2025 / Published: 1 March 2025
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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 array antenna; circular polarization; cross polarization; loop antenna

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MDPI and ACS Style

Hirose, K.; Nishino, K.; Nakano, H. A New Observation in Decoupling and Sequential Rotation Array Configurations Using Loop Radiation Elements. J 2025, 8, 9. https://doi.org/10.3390/j8010009

AMA Style

Hirose K, Nishino K, Nakano H. A New Observation in Decoupling and Sequential Rotation Array Configurations Using Loop Radiation Elements. J. 2025; 8(1):9. https://doi.org/10.3390/j8010009

Chicago/Turabian Style

Hirose, Kazuhide, Koki Nishino, and Hisamatsu Nakano. 2025. "A New Observation in Decoupling and Sequential Rotation Array Configurations Using Loop Radiation Elements" J 8, no. 1: 9. https://doi.org/10.3390/j8010009

APA Style

Hirose, K., Nishino, K., & Nakano, H. (2025). A New Observation in Decoupling and Sequential Rotation Array Configurations Using Loop Radiation Elements. J, 8(1), 9. https://doi.org/10.3390/j8010009

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