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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 × 20 × 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 &lt; −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.

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