Hexa band asymmetrical U-slot microstrip patch antenna for wireless applications

A single-layer single-patch six-band U-slot patch antenna, with linear polarization, is proposed to satisfy the impedance bandwidth of WiMAX, WLAN, point to point communication, radar, C- band satellite communication applications. This antenna is made by cutting four asymmetrical U-slots in the patch with DGS and coaxial feed. In the proposed design the impedance bandwidths (|S11|<;-10dB) of 1.4%, 5.3%, 1.3%, 3.4%, 4.5% and 7.3% are achieved at central frequencies 3.27 GHz, 3.4 GHz, 3.9 GHz,4.9 GHz, 5.3 GHz and 6.1GHz, with gains of 9dBi, 7.9dBi, 7.5dBi, 6.8dBi, 7.7dBi and 6dBi, respectively. In the proposed antenna design the asymmetry of the U-slot arm provides one more degree of freedom. Proposed antenna is also simple and low cost in fabrication.