Title :
Microstrip-Fed Circularly Polarized Square-Ring Patch Antenna for GPS Applications
Author :
Chen, Hua-Ming ; Wang, Yang-Kai ; Lin, Yi-Fang ; Lin, Che-Yen ; Pan, Shan-Cheng
Author_Institution :
Inst. of Photonics & Commun., Nat. Kaohsiung Univ. of Appl. Sci., Kaohsiung
fDate :
4/1/2009 12:00:00 AM
Abstract :
A novel coupling technique for circularly polarized square-ring patch antenna is developed and discussed. The circular polarization (CP) radiation of the square-ring patch antenna is achieved by a simple microstrip feed line through the coupling of a square patch on the same plane of the antenna. Proper positioning of the coupling square patch excites two orthogonal resonant modes with 90deg phase difference, and a pure circular polarization is obtained. The dielectric material is a square block of ceramic with a permittivity of 58 and that reduces the size of the antenna. The prototype has been designed, fabricated and found to have an impedance bandwidth of 1.1% and a 3-dB axial-ratio bandwidth of about 0.03% at GPS frequency of 1573 MHz. The characteristics of the proposed antenna have been studied by simulation software HFSS and experiments. The measured and simulated results are in good agreement.
Keywords :
Global Positioning System; UHF antennas; antenna feeds; antenna radiation patterns; microstrip antennas; microstrip lines; GPS applications; ceramic square block; circular polarization radiation; coupling technique; dielectric material; frequency 1573 MHz; microstrip feed line; microstrip-fed circularly polarized square-ring patch antenna; simulation software HFSS; Antenna feeds; Bandwidth; Ceramics; Dielectric materials; Global Positioning System; Microstrip antennas; Patch antennas; Permittivity; Polarization; Resonance; Ceramic dielectric material; circular polarization (CP); global position system (GPS); square-ring patch antenna;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2009.2015855
