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PIER PIER B PIER C PIER M PIER Letters
2008-09-13
A Circularly Polarized Quasi-Loop Antenna
By
Chien-Jen Wang,

    Prof. Chien-Jen Wang

    Department of Electrical Engineering

    National University of Tainan

    Taiwan

    Homepage

Chia-Hsien Lin

    Dr. Chia-Hsien Lin

    Center for Frontier Medical Engineering

    Chiba University

    Japan

    Homepage

Progress In Electromagnetics Research, Vol. 84, 333-348, 2008
doi:10.2528/PIER08081002
Abstract
This paper presents a circularly polarized (CP) GPS/DCS loop-like antenna with a microstrip feed. The proposed antenna comprised of a quasi-C antenna, an inverted-L sleeve strip connected with the ground plane and an L-shaped slit embedded in the ground plane. The C-like antenna generates a resonant mode with a poor impedance matching condition. The inverted-L grounded strip and the embedded L-slit are not only capable of modifying two orthogonal electric fields with equal amplitude and phase difference of 90 degree for radiating circular polarization at 1.575 GHz, but the impedance characteristics is also improved and the operating frequency is reduced. Both simulated and measured results are provided to validate the impedance and CP performance of the proposed antenna. For the optimized antenna case, the measured bandwidth with an axial ratio (AR) of less than 3 dB is larger than 19% and the measured impedance bandwidth of reflection coefficient S11 < −10 dB is about 30.1%.
Citation
Chien-Jen Wang, and Chia-Hsien Lin, "A Circularly Polarized Quasi-Loop Antenna," Progress In Electromagnetics Research, Vol. 84, 333-348, 2008.
doi:10.2528/PIER08081002
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