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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2008-12-23
Broadband Aperture-Coupled Microstrip Antennas with Low Cross Polarization and Back Radiation
By
Chai-Hui Lai,

    Dr. Chai-Hui Lai

    Department of Electrical Engineering

    National Changhua University of Education

    Taiwan R.O.C.

    Homepage

Tuan-Yung Han,

    Dr. Tuan-Yung Han

    Department of Computer and Communication Engineering

    Chienkuo Technology University

    Taiwan

    Homepage

Tsair-Rong Chen

    Professor Tsair-Rong Chen

    Department of Electrical Engineering

    National Changhua University of Education

    Taiwan R.O.C.

    Homepage

Progress In Electromagnetics Research Letters, Vol. 5, 187-197, 2008
doi:10.2528/PIERL08111805 | Google Scholar

Abstract
The paper presents the performances of microstrip patch antennas excited by the aperture-coupling feed that is composed of a T-shaped microstrip feed line and an annular-ring slot. Because the annular-ring slot is designed at a full-wavelength resonant mode, a broad impedance bandwidth can be obtained by combing the resonant modes of the coupling slot and radiating patch; moreover, a low cross polarization is also observed, especially around the direction with maximum gain. For reducing the considerable back radiation induced by the resonant coupling aperture, additional slots are introduced and embedded along the perimeter of the annular-ring slot. Experimental results show that the reformed coupling slot can improve the front-to-back ratio of the aperture-coupled microstrip antenna by more than 5 dB. Simulation analyses are also performed to support the measured results.
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Citation
Chai-Hui Lai, Tuan-Yung Han, and Tsair-Rong Chen, "Broadband Aperture-Coupled Microstrip Antennas with Low Cross Polarization and Back Radiation," Progress In Electromagnetics Research Letters, Vol. 5, 187-197, 2008.
doi:10.2528/PIERL08111805
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