Antenna system improvement to control GPS radiation pattern on portable radios

The technique to improve performance of specific GPS antennas on portable handsets by means of controlling the radiation pattern is presented in this paper. Location-based applications for handheld wireless communication devices may represent a significant revenue stream for cellular operators and may therefore add value to global positioning system (GPS) enabled handsets. Location-enabled features may also be desirable or even required, for instance, in professional and public safety radios. In order for location-based applications to provide the required quality-of-service (QoS), as it may be defined from case to case depending on the type of application, it is critical to implement GPS systems capable of operating reliably in the envisioned use scenarios.