volume | PIER Journals

2011-08-31

Compact Circularly Polarized Printed Antenna Using Magnetic Coupling-Fed and Capacitively-Loaded Structure

Ya-Fang Wang,

Dr. Ya-Fang Wang

Xidian University

China

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Bao-Hua Sun,

Dr. Bao-Hua Sun

Xidian University

China

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Xin Li,

Dr. Xin Li

National Key Laboratory of Antennas and Microwave Technology

Xidian University

China

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Zi-Xiong Yuan

Dr. Zi-Xiong Yuan

Xidian University

China

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Progress In Electromagnetics Research Letters, Vol. 26, 97-104, 2011

doi:10.2528/PIERL11070307

Abstract

A compact circularly polarized (CP) printed antenna for global positioning system (GPS) is proposed. The antenna adopts a two-layered stacked structure, in which a diagonally positioned rectangular patch is used as the driven part and capacitively loaded patch-based crossed dipoles are used as the main radiators. Good impedance matching is obtained conveniently by using magnetic-coupling feeding technique, and antenna size reduction is realized by using capacitively-loaded structure (50% size reduction in comparison with the conventional half-wave dipole antennas). A prototype of the antenna with the size of 46 mm × 46 mm is fabricated and tested. Good agreement is achieved between the simulated and measured results, which shows that the impedance bandwidth defined by 10 dB return loss is 34.8 MHz. In addition, the 3 dB-axial-ratio bandwidth is 8 MHz, and the antenna gain is about 7 dB.

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Ya-Fang Wang, Bao-Hua Sun, Xin Li, and Zi-Xiong Yuan, "Compact Circularly Polarized Printed Antenna Using Magnetic Coupling-Fed and Capacitively-Loaded Structure," Progress In Electromagnetics Research Letters, Vol. 26, 97-104, 2011.
doi:10.2528/PIERL11070307

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