Wideband Circularly Polarized Phased Array Antenna System for Wide Axial Ratio Scanning

• Published in: IEEE transactions on antennas and propagation Vol. 70; no. 2; pp. 1523 - 1528
• Main Authors: Kim, Jeong-Wook, Chae, Soo-Chang, Jo, Hye-Won, Yeo, Tae-Dong, Yu, Jong-Won
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.02.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna arrays; Antennas; Axial ratio control scheme; Bandwidths; Broadband; Broadband antennas; Circular polarization; circularly polarized (CP) phased array antenna system; Gain; Phased arrays; Photovoltaic cells; Satellite antennas; Satellite communication; Satellite communications; Scanning; wide axial ratio scanning; Wideband; wideband axial ratio
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2021.3078509

This communication proposes the wideband circularly polarized (CP) phased array antenna system for wide axial ratio scanning. For mobile satellite communication, the low-profile CP antenna with a wide axial ratio scanning region in wide frequency bandwidth is necessary, but the antenna with the required axial ratio performance is rarely reported. In this communication, the proposed CP phased array antenna system with an axial ratio control scheme has a wide axial ratio scanning region in the wide frequency bandwidth. In the proposed axial ratio control scheme, the amplitude and phase of the received signals are controlled to compensate for the difference between dual polarizations. The proposed antenna system is designed at 5.8 GHz and has a fractional frequency bandwidth of 20%. In a simulation, the axial ratio is under 1 dB at the elevation scanning region from −60° to 60° at every 360° azimuth angle in the operating frequency bandwidth. For validation, the <inline-formula> <tex-math notation="LaTeX">1\times 8 </tex-math></inline-formula> CP phased array antenna system was implemented. The measured axial ratio is under 2 dB at the elevation scanning region from −57° to 57° in the operating frequency bandwidth.