Based on IEEE 802.11 standard, frequencies of WLAN are: 2.4–2.474 GHz, 5.15–5.35 GHz, 5.475–5.725 GHz, and 5.725–5.825 GHz. Based on WiMAX Forum standard, two major band on certification profile for Fixed WiMAX (band 3.5 GHz and 5.8 GHz) and Mobile WiMAX comprises four frequencies, band 2.3 GHz, 2.5 GHz, 3.3 GHz and 3.5 GHz. At this research, design and implementation of triple-band antenna for WiMAX/WLAN was done. The frequencies of antenna are 2.4 GHz, 3.3 GHz and 5.8 GHz. The design process comprises two steps, simulation and fabrication. A kind of antenna is a microstrip antenna with triangular patch and slotted ground plane. It uses epoxy-FR4 with 1.6 mm of thickness as substrate material. Based on the simulation result by HFSS Ansoft v.11, its get slotted triangular antenna that can works at WLAN and WiMAX frequencies, i.e. 2.4 GHz (2252–2530 MHz), 3.3 GHz (3208–3520 MHz) and 5.8 GHz (5718–5869 MHz). Gains of antenna are 7.88 dB (2.4 GHz), 6.177 dB (3.3 GHz) and 6.89 dB (5.8 GHz). Meanwhile on measurement of antenna as a result of fabrication only one band that is get, 5628–5880 MHz and gain is 6.536 dB. That's caused by there is a dimension of antenna that is very small (0.005 mm) and cannot be reached by the vendor.
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