Multiband L5 Capable GPS Antenna with Reduced Backlobes

Yoonjae Lee, Mike Kirchner and Suman Ganguly

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 demanding in various GPS applications such as differential GPS applications as well as the future system. 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. This structure effectively suppresses the backlobes of the antenna pattern without increasing the diameter of the ground plane. The designed antenna has been fabricated and tested. We present some numerical results and measured performances of the designed antenna.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	1523 - 1530
Cite this article:	Lee, Yoonjae, Kirchner, Mike, Ganguly, Suman, "Multiband L5 Capable GPS Antenna with Reduced Backlobes," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 1523-1530.
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