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Design and Fabrication of Microstrip Patch Antenna with T-shaped Slits for GPS  

Lee Eun-Jin (Depr. of Telecommunication Eng., Cheju Nat'l Univ.)
Lee Kwoun-Ig (Depr. of Telecommunication Eng., Cheju Nat'l Univ.)
Kim Heung-Soo (Faculty of Telecommunication and Computer Eng., Cheju Nat'l Univ.)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.5, 2006 , pp. 169-175 More about this Journal
Abstract
In this paper, a microstrip patch antenna with the T-shaped slits is designed and fabricated for GPS. The resonant frequency of the microstrip patch antenna with the slits is lower than that of a microstrip patch antenna without the slits so it can be reduced the size of patch. In order to calculate resonant frequency of the microstrip patch antenna with the slits, the resonant frequency formulas are derived from the surface current distribution on microstrip patch antenna. Using the Ensemble 6.0 simulation tool, the accuracy of approximate equations is verified. The microstrip patch antenna with the slits is designed by using these equations. The size of the designed antenna with T-shaped slits can be reduced to 29% compared with that without the slits. The microstrip patch antenna with slits have a very narrow bandwidth. In order to improve the narrow bandwidth of microstrip patch antennas with the slits, a microstrip patch antenna with rectangular slot is proposed. As the result of the measurements, the resonant frequency of the proposed microstrip patch antenna with the T-shaped slits is 1.575GHz and the bandwidth is about 50MHz.
Keywords
GPS; T-shaped Slits; Slot;
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