A high gain dual-polarized planar slot array for WLAN applications

In this paper we present a high gain dual-polarized planar etched slot array for use in wireless local area networks (WLAN). Two sets of four collinear slots are used as radiators for each polarization. Each set of four collinear slots is constructed as a centre-fed long slotline, with etched crossovers to split the slotline in four resonant and in-phase half-wavelength slots. A reflector etched on a separate substrate spaced a quarter-wavelength away from the slot array ensures uni-directional radiation. The final antenna achieved a gain of 14.5 dBi, a return loss better than 10 dB, and port isolation in excess of 30 dB over the 2.4 – 2.484 GHz WLAN frequency band.