An Improved Design and Implementation of a Broadband Circularly Polarized Antenna

Author

Chien-Hsing Lee ; Yu-Han Chang

Author_Institution

Dept. of Syst. & Naval Mechatron. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan

Volume

62

Issue

6

fYear

2014

fDate

Jun-14

Firstpage

3343

Lastpage

3348

Abstract

This communication presents an improved design and implementation of a broadband circularly polarized antenna that features a size reduction, good axial-ratio bandwidth and good return loss bandwidth. The circuit comprises one Schiffman phase shifter that is used to obtain a wideband phase difference of 90°, and a pair of orthogonally positioned linearly polarized slot antennas with equal radiation strength that are used to accomplish a circular polarization by combining the horizontally and vertically polarized waves with a Wilkinson power divider. Measured results show that the 3 dB axial-ratio bandwidth of the proposed antenna can reach 81.5% (1.6-3.8 GHz), and the 10 dB return loss bandwidth is 100% (1.48-4.47 GHz).

Keywords

UHF antennas; antenna radiation patterns; broadband antennas; power dividers; slot antennas; Schiffman phase shifter; Wilkinson power divider; axial-ratio bandwidth; broadband circularly polarized antenna design; equal radiation strength; frequency 1.48 GHz to 4.47 GHz; horizontal polarized waves; loss 10 dB; orthogonally positioned linearly polarized slot antennas; return loss bandwidth; size reduction; vertical polarized waves; Antenna measurements; Bandwidth; Broadband antennas; Loss measurement; Phase shifters; Slot antennas; Broadband circularly polarized antenna; Wilkinson power divider; phase shifter; slot antenna;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2014.2309962

Filename

6756953