Optimized isolation between internal antennas for a dual-network wireless device

Experimental and simulation studies for achieving optimized isolation between two internal UMTS and WLAN antennas for a dual-network wireless device are presented. Results indicate that the isolation of the two antennas is strongly affected by their relative position, and that isolation less than -30 dB is possible for the two antennas. It has also been observed that the isolation is strongly related to the excited surface current distributions in the system ground plane of the wireless device.