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Two different antipodal Vivaldi antennas design with better performances are proposed. The one is a small antipodal Vivaldi antenna for a 4.1-20 GHz frequency range, and its dimension is only 34 × 50 mm 2 . Another proposed high gain antenna can achieve the maximum gain of 15.2 dBi within its operating band. Measured results of the manufactured antipodal Vivaldi antennas are in good agreement with the simulated ones. Besides the |S11|, far field radiation pattern, current distribution, phase, gain, and group delay which are important parameters of impulse distortion in ultra-wide band antenna are well analyzed. All results show that the proposed antipodal Vivaldi antennas have better performances and they are well suited for ultra-wide band communications.

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