Antenna system for GPS radiation pattern control on portable radios

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 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.