A Compact Planar Multiband Antenna For WLAN: Design, Simulation and Results

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 in the 2.4 GHz (2400–2484 MHz)/5.2 GHz (5150–5350 MHz)/5.8 GHz (5725–5825 MHz) operating bands and the worldwide interoperability for microwave access (WiMAX) 2.5/3.5/5.5 GHz (2500–2690/3400–3690/5250–5850 MHz) 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). Various bands are 1.96 GHz, 3 GHz, 5GHz. The gain of the antenna at resonant frequencies is >4.6 dBi. The maximum directivity of the antenna is 8.5dBi and the VSWR is between 1 and 2. The bandwidth of the antenna is 200 MHz, 1100 MHz, 2030 GHz bands respectively. 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. Keywords—multiband antenna, monopole antenna, WLAN, U slot antenna, WiMAX , Triangular Patch, CPW Feed.