Summary
International Symposium on Antennas and Propagation
2008
Session Number:2B03
Session:
Number:2B03-2
A Circularly-Polarized Microstrip Antenna Fed by Composite Right/Left-handed Quadrature Power Splitter
Chao-Hsiung Tseng, Chih-Lin Chang,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
A circularly-polarized (CP) microstrip antenna (MSA) fed by composite right/left-handed (CRLH) quadrature power splitter (QPS) is developed and experimentally demonstrated in this paper. Instead of using the conventional branch-line coupler to provide dual feeding inputs, two adjacent edges of the square path are fed by two outputs of the CRLH QPS for CP performance improvement. The developed CRLH QPS has an 84.2% quadrature phase bandwidth within ±5° phase variation and an amplitude imbalance of 0.45 dB over the frequency range of 1.1-2.7 GHz. As the CRLH QPS is treated as a feeding circuitry, and then applied to implement the CP MSA, one can achieve a 67.8 % return loss bandwidth and a 12.8 % axial-ratio bandwidth.