Design and Analysis of Effect of Parasitic Patch on Fractal Antenna

With the rapid development of wireless communication systems, the multiple separated frequency bands antenna has become one of the most important circuit elements and attracted much interest. In order to satisfy the IEEE 802.11 WLAN standards and the worldwide interoperability for microwave access (WiMAX) bands, various antennas for wide band operation have been studied for communication and radar systems. The design achieves a good input impedance match and linear phase of S11 throughout the pass band (1.5–7 GHz and-10 dB criterion for impedance bandwidth).). The use of fractal pattern in this paper provides a simple and efficient method for obtaining the compactness. The gain of antenna is enhanced by using parasitic patch. Various bands are 1.66GHz, 3.606 GHz, 7.515 GHz, 9.738 GHz, 11.133 GHz, 12.10GHz and 12.88 GHz. The maximum directivity of the antenna is 11.02 dBi and the VSWR is between 1 and 2. This antenna is suitable for applications in ICMS, DECT, UMTS, Bluetooth and WLAN systems. Because of linear phase and good impedance match, with some further optimization and manufacturing aspect, this antenna can serve in UWB and wireless USB applications.