A Dual Circularly Polarized Waveguide Antenna With Bidirectional Radiations of the Same Sense

作者：Zhao Yang^*; Zhang Zhijun; Wei Kunpeng; Feng Zhenghe

来源：IEEE Transactions on Antennas and Propagation, 2014, 62(1): 480-484.

DOI：10.1109/TAP.2013.2287303

• Bidirectional
• circular polarization
• dual sense
• same sense

A dual circularly polarized waveguide antenna with bidirectional radiations of the same sense is proposed in this communication. Bidirectional circular polarization (Bi-CP) of the same sense was obtained by two identical rectangular metal slices installed on one lateral side of the waveguide with an intersection angle of 45 degrees. These two metal slices were horizontally perpendicular to each other and vertically spaced by a quarter guided wavelength. Arat-race coupler was employed to excite the two metal slices with the same amplitude, but with a 0 degrees or 180 degrees phase difference depending on the selection of two inputs. One sense of Bi-CP was realized when the two metal slices were fed in phase and the opposite sense of Bi-CP could be obtained when they were fed out of phase. A prototype for 2.4-GHz WLAN application was tested to verify our design. The measured common bandwidth for 10-dB return loss and 3-dB axial ratio at the two feed ports was 230 MHz (9.6%, 2.29-2.52 GHz) and 210 MHz (8.6%, 2.35-2.56 GHz), respectively. The measured isolation between the two feed ports was better than 30 dB over the whole operating band.

• 出版日期2014-1
• 单位清华大学