Multiband L5-Capable GPS Antenna

Y. Lee, S. Ganguly, R. Mittra

Abstract:	We present a novel multiband antenna design for GPS applications at three (L1 - 1575.42MHz, L2 - 1227.60MHz and L5 - 1176.45MHz) different frequencies using the aperture coupled stacked patch configuration. The multi-frequency operation is quite demanding in various GPS applications, for instance, L1 and L2 data is required for differential GPS applications and the future GPS will be using additional L5 band. For such applications, it is desirable to use a single antenna for multi-frequency. The designed antenna is capable of operating at three different bands with improved performances in terms of bandwidth, axial ratio, cross-pol rejection level and multipath rejection characteristic. To mitigate the multipath interference, we use a novel structure, in which multiple conducting plates combined with conducting cylinders in between, that suppresses the diffraction from the ground plane edges and effectively suppress the back lobe without increasing the diameter of the ground plane. Finite Element (FEM) electromagnetic modeling has been performed for designing the antenna. The designed antenna has been fabricated and tested.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	1861 - 1869
Cite this article:	Lee, Y., Ganguly, S., Mittra, R., "Multiband L5-Capable GPS Antenna," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 1861-1869.
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