Title :
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
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;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2010.2096395
