Compact and Broadband Circularly Polarized Microstrip Antenna with Ring-Slot on Ground Plane

Masataka YASUKAWA  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.8   pp.2179-2181
Publication Date: 2007/08/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.8.2179
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
microstrip antennas,  circular polarization,  broadband,  single feed,  ring-slot,  

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For a microstrip antenna (MSA) with a ring-shaped slot on formed on the ground plane, downsizing the microstrip patch and expanding the circularly polarized bandwidth have been achieved successfully. The dimensions of the patch are 6.8 mm7.4 mm and the minimum axial ratio (AR) of 0.6 dB is obtained at 6.1 GHz. In addition, its AR is less than 3 dB at the relative bandwidth of 3.5%. The bandwidth of the proposed MSA is twice that of conventional single-feeding circularly polarized MSAs; however, its size is only half that of conventional MSAs.