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

fYear

2007

fDate

11-14 Dec. 2007

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/APMC.2007.4554762

Filename

4554762