Title :
Four square loops antenna for circular polarisation and gain enhancement
Author :
Yang, Qingxiong ; Zhang, Xiaobing ; Bai, Xiaoqing ; Wang, Nan ; Wang, Yannan ; Li, Jie ; Zhao, Xingang
Author_Institution :
Nat. Key Lab. of Sci. & Technol. on Antennas & Microwaves, Xidian Univ., Xi´an, China
Abstract :
A four square loops antenna above a finite ground plane is investigated for circular polarisation and gain enhancement. By choosing proper perimeters of the two pairs of loops, the axial ratio (??3 dB) bandwidth can reach 16%. It is demonstrated that a new pair of loops added to the original dual-loop can increase the gain to 11.6 dBic. A broadband balun is incorporated for impedance matching. The antenna performance is confirmed by experimental results.
Keywords :
baluns; electromagnetic wave polarisation; impedance matching; loop antennas; axial ratio bandwidth; circular polarisation; finite ground plane; gain enhancement; impedance matching; square loop antenna;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2010.2980
