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A compact CPW‐fed triple band‐notched antenna for ultra‐wide bandwidth (UWB) application is presented. By introducing an stepped impedance resonator‐defected ground structure (SIR‐DGS) and fork‐shaped stubs, three sharp notches are achieved at frequencies of 3.5, 5.68 and 7.48 GHz. The proposed antenna working from 2.8 to 11.3 GHz with a voltage standing wave ratio of <2 is demonstrated, except for the selected notched bands. The main advantage of the antenna is that the frequency of the notched band can be tuned easily in a wide frequency range. A good agreement between the measurement and the simulation was achieved. The measurements confirm that the technique introduces negligible antenna radiation pattern distortion, except at the triple‐notched frequencies. [ABSTRACT FROM AUTHOR]