Compact Circularly Polarized Microstrip Antennas Using EM Coupled Loop Resonators

Junho CHOI
Seongmin PYO
Sang-Min HAN
Young-Sik KIM

IEICE TRANSACTIONS on Communications   Vol.E93-B    No.10    pp.2658-2661
Publication Date: 2010/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.2658
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Advanced Technologies in Antennas and Propagation in Conjunction with Main Topics of ISAP2009)
Category: Antennas
microstrip antenna,  circular polarization,  coupled feed,  ring resonator,  

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In this letter, compact loop resonator type circular polarization (CP) antennas with a square ring and an X-shaped meander loop are presented. Both antennas are fed to a microstrip line with electromagnetic coupling. By adjusting the gap and length of a coupled microstrip line, the magnitude and phase conditions of two orthogonal modes for CP can be determined. The proposed antennas show good axial ratios and also good agreements between experimented and simulated results.