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Broadband Circularly Polarized Beam-Steering Antenna Array

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5 Author(s)
Changrong Liu ; Instn. of Appl. Phys., Univ. of Electron. Sci. & Technol. of China, Chengdu, China ; Shaoqiu Xiao ; Yong-Xin Guo ; Yan-Ying Bai
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A wideband circular polarized (CP) switched-beam patch antenna array is presented in this communication. The switched-beam system consists of four two-section branch-line couplers, two wideband 45 phase shifters and 1 × 4 proximity-coupled L-probe feeding CP microstrip patch antenna array. With such an arrangement, the proposed array can obtain a wide axial ratio (AR) bandwidth than that of conventional switched-beam CP antenna array. Measured results showed this array has an impedance bandwidth over a frequency range of 4.04-5.78 GHz (~36%) for |S11| <; -10 dB and AR bandwidth from 4.3 to 5.75 GHz (~29%) for AR <; 3dB when the main beam of array is scanned to different four directions.

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:61 ,  Issue: 3 )