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Axial ratio correction for GNSS antennas in asymetrically coupled environments

: Narbudowicz, A.; Ammann, M.J.; Heberling, D.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Antennas and Propagation Society:
IEEE Antennas and Propagation Society International Symposium 2017. Proceedings : July 9-14, 2017, Manchester Grand Hyatt, San Diego, California, USA
Piscataway, NJ: IEEE, 2017
ISBN: 978-1-5386-3284-0
ISBN: 978-1-5386-3283-3
ISBN: 978-1-5386-0898-2
International Symposium on Antennas and Propagation <2017, San Diego/Calif.>
Fraunhofer FHR ()

The paper demonstrates a technique to correct the axial ratio of dual-fed circularly-polarized antennas in the presence of strong coupling with surrounding components or asymmetrically reduced ground plane. It demonstrated - based on a standard GPS L1 patch antenna - that for certain situations a phase shift of up to 135° may be beneficial compared to the routinely used 90°, allowing for AR improvement from 7.8 dB (for 90°) to 2.1 dB (135°).