Development of a High-Efficiency Circularly Polarized Ka-Band Satcom Antenna Utilizing Ridge-loaded U-shaped Radiator

This paper presents a low-profile, high-gain cavitybacked slot array antenna, based on Ridge Gap Waveguide (RGW) technology, to operate within the Ka frequency band. The antenna array consists of two layers. The upper layer incorporates an array of U-shaped slots, positioned over a cavity loaded wit...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2024, Vol.In Press, p.1-5
Main Authors: Roosefid, Raha, Moghaddam, Sadegh Mansouri, Nystrom, Lukas, Yang, Jian, Zaman, Ashraf Uz
Format: Article
Language:English
Subjects:
Antenna arrays
Antenna measurements
Antenna radiation patterns
Antennas
Bandwidth
Broadband antennas
Circular Polarization
Couplings
Gain
High Efficiency
High Gain
Ka-Band Antenna
Reflector antennas
Ridge Gap Waveguide Technology
Satellite Communication
Slot antennas
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Summary:This paper presents a low-profile, high-gain cavitybacked slot array antenna, based on Ridge Gap Waveguide (RGW) technology, to operate within the Ka frequency band. The antenna array consists of two layers. The upper layer incorporates an array of U-shaped slots, positioned over a cavity loaded with a metal ridge section, while the lower layer is a ridge gap waveguide corporate distribution network, feeding each of the cavity-backed slots separately with equal phase and amplitude. The proposed array antenna radiates circularly polarized waves (axial ratio below 3 dB) over a bandwidth of 8.6% ranging from 27.5 to 30 GHz. At the centre frequency of 28.75 GHz, the peak gain at the broadside direction is 27 dBi and the first relative sidelobe level is below −13 dB. The total size of the proposed 8×8-element array antenna is 6.7λ0×6.5λ0×1.4λ0
ISSN:1536-1225
1548-5757
1548-5757
DOI:10.1109/LAWP.2024.3506452