An integration of dual-band filtering antenna for WLAN application

A compact dual-band filtering antenna is proposed for WLAN(2.4G/5.2G) Application. It is a integrated design of a step impedance resonators dual-band bandpass filter and a patch antenna using aperture coupled feed techniques. The patch antenna can be viewed as a radiator but also the last resonator of the dual-band bandpass filter. Compared with traditional wireless communication system, the filtering antenna leaves out the 50 Ω transmission line instead of an aperture coupled structure, thus, no more additional space is needed, which makes the size more compact. Besides, the proposed filtering antenna provides a high band-edge gain selectivity.