Title :
A Novel Design on Broadband Circularly Polarized Microstrip Antenna
Author :
Li, Zhu ; Guang-ming, Wang ; Xiang-Jun, Gao
Author_Institution :
Missile Inst., Air Force Eng. Univ., Xi´´an
Abstract :
A square array of air columns is embedded in a dielectric substrate to form the PBG structure and the band-gap of such PBG structure is analyzed at first. Then a broadband circularly polarized antenna based on the PBG structure is introduced. Through selecting appropriate lattice period and air column radius, the surface wave can be suppress effectively and the circularly polarized characteristic can be improved when the resonant frequency (f=12.5 GHz) of antenna fell in the band-gap of PBG structure. After calculating and testing, the 20.6% (VSWR<2) bandwidth and 27.4% 3-dB axial ratio bandwidth are achieved respectively. Such circularly polarized antenna can be used extensively in communications field.
Keywords :
broadband antennas; electromagnetic wave polarisation; microstrip antennas; photonic band gap; PBG structure; broadband circularly polarized antenna; dielectric substrate; microstrip antenna; photonic bandgap structure; resonant frequency; surface wave; Bandwidth; Broadband antennas; Dielectric substrates; Lattices; Microstrip antenna arrays; Microstrip antennas; Photonic band gap; Polarization; Resonant frequency; Surface waves; PBG; broadband; circularly polarized; microstrip antenna;
Conference_Titel :
Microwave Conference, 2007. APMC 2007. Asia-Pacific
Conference_Location :
Bangkok
Print_ISBN :
978-1-4244-0748-4
Electronic_ISBN :
978-1-4244-0749-1
DOI :
10.1109/APMC.2007.4554762
