Title :
A dual circularly polarized antenna with improved axial ratio bandwidth
Author :
Luo, Guo Qing ; Li, Peng ; Zheng, Zhi Chang ; Sun, Ling Ling
Author_Institution :
Key Lab. of RF Circuits & Syst. of Minist. of Educ., Hangzhou Dianzi Univ., Hangzhou, China
Abstract :
A dual circularly polarized antenna with improved axial ratio (AR) bandwidth is described in this paper. The proposed antenna is a substrate integrated waveguide (SIW) cavity backed crossed slot antenna with a parallel feed configuration. By employing a branch line coupler as the parallel feed, not only AR bandwidth of the proposed antenna is improved by about five times that of a single feed SIW cavity backed crossed slot antenna, but also its dual circularly polarized radiation can be easily switched by selecting one port between the input and the matched ports of the branch line coupler as the feed port.
Keywords :
antenna radiation patterns; multifrequency antennas; polarisation; slot antennas; substrate integrated waveguides; waveguide couplers; axial ratio bandwidth; branch line coupler; dual circularly polarized antenna; dual circularly polarized radiation; parallel feed configuration; slot antenna; substrate integrated waveguide cavity; Antenna feeds; Antenna measurements; Bandwidth; Microstrip antennas; Slot antennas;
Conference_Titel :
Microwave Conference Proceedings (CJMW), 2011 China-Japan Joint
Conference_Location :
Hangzhou
Print_ISBN :
978-1-4577-0625-7
Electronic_ISBN :
978-7-308-08555-7
