Triple Band Microstrip Patch Antenna Useful for Wi-Fi and WiMAX

In this paper, a compact microstrip patch antenna is designed having a partial ground plane with symmetrical parasitical elements, an extended microstrip line and an I-shaped patch having a rectangular slot. The size of the proposed antenna is 15 x 20 x 1.6 mm(3) having a substrate of FR4 material having a relative permittivity of 4.3 and a loss tangent of 0.025. The combined effect of an extended microstrip line and a rectangular slot in I-shaped patch produces bandwidth enhancement in the design. Simulated results show that the impedance bandwidths (S11 < -10 dB) of the proposed antenna are 2.34-2.46 GHz, 4.61-5.92 GHz and 9-9.9 GHz. The peak gain of the proposed antenna is 3.0209 dB which is coming in the high-frequency band. Although the gain of the antenna is very low in the low-frequency band as the size is very small, the gain in the middle frequency band is 2.17 dB. The antenna is most suitable for Wi-Fi (2.4 GHz), WiMAX (5.8 GHz) and X band (9-10 GHz). Measured results show good agreement with the simulated result of the proposed antenna.