Title :
Slot-coupled circularly polarized square patch antenna for electronic toll collection system
Author :
Zhang, Shunbo ; Zhuang, Yuan ; Zhu, Shouzheng
Author_Institution :
Dept of EE., East China Normal Univ., Shanghai
Abstract :
A right-hand circularly polarized (RHCP) square patch microstrip antenna for the on board unit (OBU) of electronic toll collection (ETC) system is designed, according to the national standard of GB/T 20851.1-2007. Wide bandwidth is achieved by choosing two suitable coupling slots in the ground plane of the stripline structure. The simulated return loss, radiation patterns, and the influence of via holes in the substrate are presented. The measured results show that a wide 2:1 VSWR bandwidth of 1.2 GHz (or about 21% with center frequency at 5.8 GHz) is obtained, and a RHCP gain of 6.6 dB is reached.
Keywords :
coupled circuits; microstrip antennas; substrates; GB/T 20851.1-2007; bandwidth 1.2 GHz; coupling slots; electronic toll collection system; frequency 5.8 GHz; on board unit; radiation patterns; right-hand circularly polarized; slot-coupled circularly polarized square patch antenna; square patch microstrip antenna; stripline structure; substrate; wide bandwidth; Bandwidth; Coupling circuits; Frequency; Microstrip antennas; Mutual coupling; Patch antennas; Polarization; Power dividers; Slot antennas; Stripline; ETC; RHCP; broadband; via holes;
Conference_Titel :
Microwave and Millimeter Wave Technology, 2008. ICMMT 2008. International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-1879-4
Electronic_ISBN :
978-1-4244-1880-0
DOI :
10.1109/ICMMT.2008.4540649
