Internal PIFAs for UMTS/WLAN/WiMAX multi-network operation for a USB dongle

Two kinds of internal planar inverted-F antennas (PIFAs) suitable for application in a USB dongle for UMTS/WLAN/WiMAX multi-network operation are presented. The first one is a hybrid PIFA consisting of a metal-plate portion and a printed portion, while the second one is a printed PIFA. Both the hybrid and printed PIFAs are suitable to be mounted at the top no-ground region of the USB dongle as internal antennas and can generate two wide bandwidths at about 2.3 and 5.5 GHz to cover the UMTS (1920-2170 MHz), WLAN (2400248415150-535015725-5825 MHz) and WiMAX (2500-269015150-5850 MHz) bands for seamless wireless network access. Detailed designs of the two PIFAs are described, and results of their impedance and radiation characteristics are presented and discussed. (c) 2006 Wiley Periodicals, Inc.