A unidirectional ultra‐wideband circularly polarized spiral antenna array

This paper studies a unidirectional ultra‐wideband circularly polarized (CP) spiral antenna array. The ultra‐wideband high‐gain CP operation is realized by implementing four‐element sequentially rotated spiral array antennas fed with an ultra‐wideband feeding network. Tapered multisections power div...

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Bibliographic Details
Published in:Microwave and optical technology letters 2020-07, Vol.62 (7), p.2569-2575
Main Authors: Geng, Jingru, Liu, Xueguan, Liu, Changrong, Guo, Huiping
Format: Article
Language:English
Subjects:
absorbing material
Antenna arrays
Apertures
Bandwidths
Broadband
Circular polarization
Phase shifters
Power dividers
spiral antenna
Spiral antennas
Substrates
Ultrawideband
wideband array
wideband feeding network
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Summary:This paper studies a unidirectional ultra‐wideband circularly polarized (CP) spiral antenna array. The ultra‐wideband high‐gain CP operation is realized by implementing four‐element sequentially rotated spiral array antennas fed with an ultra‐wideband feeding network. Tapered multisections power dividers and broadband microstrip‐slot phase shifters are utilized to provide accurately equal power division and constant phase shifts of 90°. In order to further improve the CP operating bandwidth, foam of absorber is adopted between the radiating aperture and the feeding network substrate. The proposed CP array is designed, fabricated, and measured. Test results show that the impendence bandwidth of the proposed array covers 2.2 to 11.6 GHz (5.3:1) and 3 dB axial‐ratio bandwidth covers 2.3 to 13 GHz (5.65:1), demonstrating a stable CP array performance within an ultra‐wide working bandwidth.
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.32340