Novel Co-planar Waveguide (CPW)-Fed Small Antenna with Circular Polarization

Jaehyurk CHOI  Sungjoon LIM  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.7   pp.2141-2144
Publication Date: 2011/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2141
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
circularly-polarized (CP) antenna,  small antenna,  co-planar waveguide (CPW),  

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A planar circularly-polarized (CP) small antenna is proposed. To obtain a low profile configuration, a co-planar waveguide (CPW) structure is employed. Circular polarization is achieved using a curved stub that generates current distribution in a direction orthogonal to the current distribution from the patch. Using meander lines and a series gap capacitance, a 70% size reduction is achieved compared to a half-wavelength resonant antenna. To the best of the authors' knowledge, the proposed antenna is the smallest CP antenna using CPW technology. The measured 3 dB axial ratio bandwidth is 8.3% from 3.83 GHz to 4.16 GHz, and a 1.6 dBic gain and 89% efficiency are achieved.