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In order to measure signal which has 0.5-20 GHz bandwidth, TEM horn antenna is a good choose for the high requirement both in low and high frequency. In this paper, a planar TEM horn antenna is presented in the paper which is similar to Vivaldi antenna, but has better quality in low frequency and a 0.5-25 GHz bandwidth. The model is established with CST@ software and the parameters are optimized to decrease its size. In the end a better result is obtained.