In this paper, we present a new ultra-wide-band TEM horn antenna by using smoothing gradient structure and loading technology, which increases back-flow channel of low-frequency current. We make a contribution for this paper with three aspects. 1) Improve standing wave characteristic; 2) antenna reflection voltage optimization and 3) radiation characteristic optimization. Additionally, we add an absorption resistance at the end of antenna. This new ultra-wide-band horn antenna improves the low frequency characteristic of antenna and strengthens the directional radiation ability. Finally, we make practical experiments to prove the performance of our new antenna and make comparisons to other new antenna design methods. Results show that when coefficient of voltage standing wave is less than 2, the impedance bandwidth of new antenna is 11:1. The new method has strong radiation ability and good qualitative radiation characteristics, which can meet the requirements of radar system.
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