Printed square quadirifilar helix antenna (QHA) for XM Satellite Radio receiver

In this paper, a new printed square quadrifilar helix antenna (QHA) with circular polarization (CP) applied for XM Satellite Radio is proposed. To improve the radiation efficiency of QHA, the optimum matching method considering both the reflection coefficients at each feeding port and the mutual coupling coefficients between each antenna is used. The measured results show that the proposed antenna has a 3-dB beam-width of more than 150° and a front-to-back ratio of more than 15 dB. Also, the proposed antenna shows the peak gain of about 0 dBic and the axial ratio less than 2 dB in a targeted frequency band. The center frequency is designed at 2.335GHz.