Abstract
A full metal housing antenna for tablet to cover the GPS and WLAN b/g/a bands (1565-1585, 2412-2484 and 4920-5825 MHz) is presented.The cavity is created by the enclosed volume of PCB and metal housing of the tablet. The cavity is properly excited by a flat exciting element with dimensions of only 36×4 mm 2 positioned at an open slot between PCB and metal housing at the tablet's top surface. Among many excited cavity mode resonances, the ones close to the target frequency bands were selected and properly adjusted by adding grounding vias and shorting strip based on the E field distributions. This unique cavity mode excited antenna has measured -6 dB return loss bandwidth of 1 500-1 600 MHz, 2 380-2 500 MHz, 4 580-5 960 MHz and the average efficiencies for all the three bands are over 50%. Therefore, it overcomes the efficiency degradation issue that traditional IFA or monopole antennas are facing at the full metal housing environment.
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