A miniaturized tapered slot antenna is presented in this paper. A Vivaldi antenna with a novel feeding balun is selected as the basic design and resistive loading is used at the end of it to make a compact structure. The proposed antenna is fabricated with the size of 155mm (length)*120mm (width)*0.6m-m (thickness). The measured results, which are in agreement with the simulated theory by HFSS, show that the bandwidth is 0.36～4GHz (S11<-10dB), while the gain varies between -6.2 and 7.5dB. It is indicated that the antenna can be used for wideband applications which have strict request for the size.
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