A Novel Broadband Circularly Polarized Antenna Based on Off-Center-Fed Dipoles

Author

RongLin Li ; Lijun Pan ; YueHui Cui

Author_Institution

Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China

Volume

63

Issue

12

fYear

2015

Firstpage

5296

Lastpage

5304

Abstract

A novel broadband circularly polarized (CP) antenna is proposed. The operating principle of this CP antenna is different from those of conventional CP antennas. An off-center-fed dipole is introduced to achieve the 90° phase difference required for circular polarization. The new CP antenna consists of two off-center-fed dipoles. Combining such two new CP antennas leads to a bandwidth enhancement for circular polarization. A T-shaped microstrip probe is used to excite the broadband CP antenna, featuring a simple planar configuration. It is shown that the new broadband CP antenna achieves an axial ratio (AR) bandwidth of 55% (1.69-3.0 GHz) for AR <; 3 dB, an impedance bandwidth of 60% (1.7-3.14 GHz) for return loss (RL) > 15 dB, and an antenna gain of 6-9 dBi. The new mechanism for circular polarization is described and an experimental verification is presented.

Keywords

antenna feeds; broadband antennas; dipole antennas; electromagnetic wave polarisation; T-shaped microstrip probe; antenna gain; axial ratio bandwidth; bandwidth 1.69 GHz to 3.14 GHz; bandwidth enhancement; broadband CP antenna; broadband circularly-polarized antenna; impedance bandwidth; loss 15 dB; off-center-fed dipoles; planar configuration; return loss; Bandwidth; Broadband antennas; Broadband communication; Dipole antennas; Feeds; Impedance; Stripline; Broadband antenna; Circularly polarized antenna; broadband antenna; circularly polarized (CP) antenna; off-center-fed dipole; planar antenna;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2015.2491963

Filename

7299649