A New Quad-Band CPW-Fed Stacked Antenna for Wireless LAN Applications

A novel quad-band coplanar waveguide (CPW)-fed stacked antenna suitable for wireless LAN applications is presented. The antenna uses two orthogonal-shaped slot antennas printed on similar groundless substrates stacked at the top of each other. Each antenna is known to be suitable for dual-band operation, so the stacked configuration gives rise to the satisfactory operation of the antenna in four distinct frequency bands. The specifications of the antenna's operating frequency bands, i.e. the center frequencies and their respected band widths have been selected such that most high speed wireless LAN systems especially those with WiMAX protocol can be supported by the antenna. Ansof's HFSS software was employed for designing the antenna. The CST Microwave Studio was then used for verifying the results and optimizing the structure for the desired frequency bands.