Cavity-Backed Circularly Polarized Self-Phased Four-Loop Antenna for Gain Enhancement

Author

Yang, Qian ; Zhang, Xiaomiao ; Wang, Nan ; Bai, Xue ; Li, Jinyang ; Zhao, Xudong

Author_Institution

Nat. Key Lab. of Sci. & Technol. on Antennas & Microwaves, Xidian Univ., Xi´´an, China

Volume

59

Issue

2

fYear

2011

Firstpage

685

Lastpage

688

Abstract

A cavity-backed loop antenna is presented for radiating circular polarization (CP) waves and gain enhancement. The antenna is double-side printed on a substrate. It consists of two pairs of orthogonal dual square loops fed in parallel. It satisfied self-phase shift to radiate CP waves, as the smaller loop has a 90° phase ahead of the larger loop. With two more loops than dual-loop antenna, the gain can be increased to 13.5 dBic, while the size changes little. A coplanar balun is incorporated for impedance matching and simple feeding. The experimental and simulated results are in good agreement.

Keywords

antenna feeds; baluns; electromagnetic wave polarisation; impedance matching; loop antennas; microstrip antennas; antenna feeding; cavity-backed circularly polarized self-phased four-loop antenna; circular polarization wave; coplanar balun; double-side printed antenna; dual-loop antenna; gain enhancement; impedance matching; orthogonal dual square loop; self-phase shift; Cavity-backed; circular polarization; high gain; loop antenna; self-phase;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2010.2096395

Filename

5654575