Wideband Circularly Polarized Horn Antenna with Twisted Ridges of Gielis Super-Formula Contour

Kwok Wa Leung; Chu-Tian Huang; Zheng Fang; Kai Lu; Nan Yang

doi:10.1109/TAP.2024.3489891

Author(s)

Kwok Wa Leung
Chu-Tian Huang
Zheng Fang
Kai Lu
Nan Yang

Related Research Unit(s)

Detail(s)

Original language	English
Pages (from-to)	1197-1202
Journal / Publication	IEEE Transactions on Antennas and Propagation
Volume	73
Issue number	2
Online published	7 Nov 2024
Publication status	Published - Feb 2025

Link(s)

DOI	DOI https://doi.org/10.1109/TAP.2024.3489891 Final Published version
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Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85208975088&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(51e54d40-5fa3-4a85-90ee-6c6f57d8594e).html

Abstract

This communication presents a wideband singly-fed circularly polarized (CP) twisted-ridge horn antenna. This horn antenna has a record-high CP operating bandwidth of 86.3%. The Gielis super formula is employed to design the twisted ridges, enhancing the axial ratio (AR) bandwidth. A new waveguide-coax launcher with a ridged back cover is incorporated to boost the impedance bandwidth. By using these new design techniques, the overlapped bandwidth of the CP horn antenna can be increased. For demonstration, a K-band CP twisted-ridge horn antenna is designed, fabricated, and experimentally evaluated. The measured 10-dB impedance bandwidth and 3-dB AR bandwidth are 90.6% (14.6-38.8 GHz) and 88.2% (15.4-39.7 GHz) respectively, giving a very wide overlapped bandwidth of 86.3% (15.4-38.8 GHz). It is found that the measured antenna gain generally increases with frequency in the operating passband.

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