Design of wideband and multiband antenna using dual patch for wireless devices

The microstrip antenna using dual patch is proposed for WLAN and WiMax application. The proposed Antenna comprising of Fr4 substrate with C shaped slot connected to simple feed network. Micro-strip line is used as a feeding source. The relative permittivity of Fr4 substrate is 4. 44 respectively. By using position and dimensions of the slots the frequencies of dual band can be independently controlled. For the proposed antenna, the return loss is achieved -11. 20dB. The micro-strip antennas are used for cognitive radio applications. The design are analysed and simulation using “Ansoft HFSS” is employed to optimize the antenna properties, which shows the features of good radiation pattern, gain, small size structure operating in wide frequency band for which both return loss and directivity is examined.