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PIER PIER B PIER C PIER M PIER Letters
2011-10-19
A Coplanar-Strip Dipole Antenna for Broadband Circular Polarization Operation
By
Ching-Long Tsai

    Dr. Ching-Long Tsai

    Department of Electronic Engineering

    Ming-Chuan University

    Taiwan

    Homepage

Progress In Electromagnetics Research, Vol. 121, 141-157, 2011
doi:10.2528/PIER11082407
Abstract
A coplanar-strip dipole antenna with two enhanced features is presented for broadband circular polarization (CP) operation. The first feature of the proposed antenna is the replacement of a conventional thin dipole by a wide strip, resulting in two degenerated orthogonal modes to make CP operation possible. The second one is the use of two coplanar strips instead of two non-coplanar ones, thereby giving rise to the advantages of easy implement, good impedance matching, and wide axial ratio (AR) bandwidth. Two examples are given, one for the lower band around 1.8 GHz and the other for the ultra-wideband (UWB). For the lower band, the measured -10 dB return loss (RL) bandwidth is 119% (0.74 to 2.93 GHz), and the measured 3 dB AR bandwidth is 50% (1.45 to 2.41 GHz). As for UWB, the measured RL is below -10 dB between 2.1 to 10.1 GHz, and the measured AR is below 5 dB between 4.1 to 7.75 GHz.
Citation
Ching-Long Tsai, "A Coplanar-Strip Dipole Antenna for Broadband Circular Polarization Operation," Progress In Electromagnetics Research, Vol. 121, 141-157, 2011.
doi:10.2528/PIER11082407
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