A COMPACT OMNIDIRECTIONAL DUAL-POLARIZED ANTENNA FOR 2.4-GHz WLAN APPLICATIONS WITH HIGHLY ISOLATED ORTHOGONAL SLOTS

An omnidirectional dual-polarized slot antenna with high port isolation for 2.4-GHz wireless local area network (WLAN) applications is proposed in this paper. The omnidirectional radiation patterns of the vertical polarization (VP) and horizontal polarization (HP) are achieved by individually cutting two orthogonal slots onto the metal walls of a cuboid antenna. The overall volume of the compact antenna is only 60 × 10 × 10mm3 (0.488λ0 × 0.081λ0 × 0.081λ0). A prototype of the designed antenna is manufactured and tested. Both simulated and measured results show that the −10 dB impedance bandwidths of dual polarizations cover the desired band of 2.4– 2.484GHz and the port isolation, in the operating frequency, is less than −35 dB. Stable measured gains are greater than 2.75 and 1.35 dBi for the VP and HP, respectively.