A λ/2 loop antenna for GPS application in mini-laptop

The proposed antenna design was suit for GPS ( Global Positioning System ) application in mini-laptop terminal. It was consisted of six elements, including system ground plane, antenna ground plane, clearance area, U-shaped loop strip, shored point, and a 50 ΩRF feeding cable. Due to extending by cable, the proposed antenna can be regarded as an extended antenna. The resonant mechanism was excited by the U-shaped loop strip which total current length is about λ/2 at 1.575 GHz to meet the requirements of the GPS reception. For total thickness, the proposed design has very low profile, less than 10 mm. For related antenna performance, the impedance bandwidth can be reached up to 120 MHz@10 dB which can provide a highly tolerance for assembly and the polarized behavior is also tending toward RHCP which is helpful for GPS signal reception. In addition, the proposed design has a good immunity to resist the detuning by nearby metal devices such as I/O connectors, speaker, and CCD etc. Detailed analysis and explanation will be presented.