The improvement technology of radiation pattern for GPS antenna

@article{Yeh2014TheIT,
  title={The improvement technology of radiation pattern for GPS antenna},
  author={Shih-Huang Yeh and Shao-Yu Huang and S. Fang},
  journal={2014 International Symposium on Antennas and Propagation Conference Proceedings},
  year={2014},
  pages={593-594}
}
This paper shows a radiation pattern improvement method for GPS antenna. By adding 2 wavetraps into a mobile device at a specific location, the upper hemisphere efficiency (UHE) with wavetraps is improved from 26% to 46%. This technology does not increase any antenna area and antenna clearance. It represents the technology is useful for mobile antenna, especially in GPS/GLONASS application.