Small Inverted-U Loop Antenna for Gps Application

Y.-C. Lin Department of Mechanical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan, R.O.C.; Research Center for Biomedical Devices, Taipei Medical University, Taipei 11031, Taiwan, R.O.C.

W.-S. Chen Department of Electronic Engineering, Southern Taiwan University, Tainan 710, Taiwan, R.O.C.

B.-Y. Lee Department of Electronic Engineering, Southern Taiwan University, Tainan 710, Taiwan, R.O.C.

S.-Y. Lin Department of Electronic Engineering, Cheng Shiu University, Kaohsiung County 833, Taiwan, R.O.C.

H.-W. Wu Department of Electronic Engineering, Cheng Shiu University, Kaohsiung County 833, Taiwan, R.O.C.

Abstract

This paper proposes a small and thin circularly polarized (CP) inverted-U loop antenna for GPS applications. The proposed antenna having 9 mm in height is suitable to be placed in the edge of laptop computer's upper case. The operating frequency band centered at 1570 MHz is resonated by the inverted-U strip, which length is about 1/2 wavelength of 1570 MHz in dielectric (ε_r = 4.4). When the proposed antenna is mounted on the system ground of 49 * 90 (handset phones), 60 * 130 (PDA), and 170 * 220 (laptop computers) mm², the CP radiation is achieved by two traveling wave modes. The correspondences of both simulated and measured results are shown in this paper. In addition, the field test result shows that the proposed antenna assembled on 170*220 mm² system ground provides acceptable GPS data transmission.

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Small Inverted-U Loop Antenna for Gps Application

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Small Inverted-U Loop Antenna for Gps Application

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