In this paper, a novel compact tri-band monopole antenna for WLAN/WiMAX applications is proposed. By using a horizontal H-shaped strip and an L-shaped open end stub, and a deformation inverted T-shaped strip through a matching line attached to the 50-Ω feed-line, tri-band has impedance bandwidths for S11≤ -10 dB are 2.4-2.7 GHz, 3.4-3.72 GHz, 5.06-5.85 GHz, covering 2.4/5.2/5/5.8 GHz for WLAN and 2.5/3.5/5.5 for WiMAX applications can be acquired. Experimental results show that the proposed tri-band antenna has nearly omnidirectional radiation characteristics across all the operation bands. Furthermore, the antenna with compact size of 30 × 20 × 0.8 mm3 has simple structures.
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