A Loop-Line Antenna with Enhanced Bandwidth of Circular Polarization

We investigate a circularly polarized (CP) transmission-line antenna composed of loop radiation elements, called a loop-line antenna. To enhance the CP wave bandwidth, an isolated loop radiation element is first analyzed using the method of moments. It is found that a CP wave bandwidth for a 3 dB ax...

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Bibliographic Details
Published in:International journal of antennas and propagation Vol. 2020; no. 2020; pp. 1 - 6
Main Authors: Hirose, Kazuhide, Nakano, Hisamatsu, Nakatsu, Motoshi
Format: Journal Article
Language:English
Published: Cairo, Egypt Hindawi Publishing Corporation 2020
Hindawi
John Wiley & Sons, Inc
Wiley
Subjects:
Antenna design
Antennas
Bandwidths
Broadband
Circular polarization
Method of moments
Transmission lines
Wire
ISSN:1687-5869, 1687-5877
Online Access:Get full text
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Summary:We investigate a circularly polarized (CP) transmission-line antenna composed of loop radiation elements, called a loop-line antenna. To enhance the CP wave bandwidth, an isolated loop radiation element is first analyzed using the method of moments. It is found that a CP wave bandwidth for a 3 dB axial-ratio criterion has a maximum value of 8%. On the basis of the analysis results, we design the loop-line antenna. It is found that the antenna shows a CP wave bandwidth of 6%, which is twice as wide as that of a conventional loop-line antenna. The analysis results are verified with experimental ones. In addition, a condition for wideband CP radiation is discussed and found to be a composite radiation element consisting of two CP loops.
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ISSN:1687-5869
1687-5877
DOI:10.1155/2020/5216132