Studies on dual-band multi-slot antennas

Abstract

A new technique is proposed to increase the bandwidth (BW) of slot antenna operated at 2.4GHz and 5 GHz, over the industrial-scientific-medical (ISM) bands and the Hiperlan2 bands. By splitting two side slots of the Z-like slot antenna into two or three fingers, several additional resonances can be created. By properly arranging the geometry of the feeding structure in the multi-slot region, the double-slot and triple-slot antennas have respectively 2.0 and 3.2 times wider bandwidth than the single Z-slot antenna. According to the results, the proposed triple-slot antenna can provide two separated impedance bandwidths of 672Hz (about 28.3% centered at 2.4GHz band) and 2752MHz (about 53.5% centered at 5.2GHz band), making it easily cover the required bandwidths for WLAN operation in the 2.4 GHz band and 5.2/5.8 GHz bands.