Broadband, wide beam circularly polarized antenna with a novel matching structure for satellite communications

作者：Sun Ling^*; Sun Baohua; Wu He; Yuan Jiangpeng; Tang Wending

来源：Progress in Electromagnetics Research C, 2015, 59: 159-166.

DOI：10.2528/PIERC15101101

• 3-dB beamwidth
• Beam widths
• Circularly polarized antennas
• Feeding networks
• Impedance bandwidths
• Power divider
• Rectangular patch
• Satellite communications

A wide beam, circularly polarized (CP) antenna is presented for satellite communications. The antenna consists of two crossed bent dipoles, two baluns and two pairs of rectangular patches and a feeding network. The two dipoles are fed by the two baluns, respectively. The arms of the dipoles are bent to save the horizontal space and to broaden the beamwidth. The rectangular patches which are connected to the arms of the dipoles form the matching structure of the proposed antenna. The impedance bandwidth of the antenna is broadened by adjusting the length of the rectangular patches. A broadband 90°power divider is used to feed the proposed antenna and to realize circular polarization. The antenna has a -10-dB impedance bandwidths of 77% (1.73–3.89 GHz). The proposed antenna exhibits a measured 2-dB AR bandwidth of 76.3%, from 1.71 GHz to 3.8 GHz. The 3-dB beamwidth is greater than 88°over the whole working band. Results show that the proposed antenna is suitable for the application of satellite communications.

• 出版日期2015
• 单位西安电子科技大学