Title :
A novel broadband omni-directional circularly polarized antenna for mobile communications
Author :
Quan, XuLin ; Li, RongLin ; Tentzeris, Manos M.
Author_Institution :
Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China
Abstract :
This paper presents a new broadband omni-directional circularly polarized (CP) antenna for mobile communications operating nearby 2 GHz. The new omni-directional CP antenna consists of four broadband CP rectangular loops which are bent to form a hollow cylinder. A conducting cylinder is introduced inside the hollow cylinder to improve the CP performance. A broadband balun is developed to feed the CP antenna. This antenna has a compact cylindrical configuration with a diameter of 0.4λ. The simulation shows that this antenna has a bandwidth of 30.8% (1.7 GHz-2.32 GHz) for return loss (RL) ≥10 dB and 36.1% (1.75 GHz-2.52 GHz) for average axial ratio (AR) ≤3 dB. Good agreement between simulated and measured results is achieved.
Keywords :
UHF antennas; baluns; broadband antennas; mobile communication; omnidirectional antennas; polarisation; bandwidth 1.7 GHz to 2.32 GHz; broadband CP rectangular loops; broadband balun; broadband omnidirectional antenna; circularly polarized antenna; conducting cylinder; hollow cylinder; mobile communications; Antenna measurements; Bandwidth; Broadband antennas; Broadband communication; Impedance matching; broadband antenna; circularly polarized antenna; mobile communications; omni-directional antenna;
Conference_Titel :
Antennas and Propagation (APSURSI), 2011 IEEE International Symposium on
Conference_Location :
Spokane, WA
Print_ISBN :
978-1-4244-9562-7
DOI :
10.1109/APS.2011.5996839
