Improved design of Vivaldi antenna with loading resistance for wideband applications

With the development of high-speed integrated circuit, the Ultra Wideband (UWB) communication system has been developed toward the direction of miniaturization, integration, which will necessarily promote UWB antenna also be developed toward the direction of miniaturization, integration, etc. This paper proposes an improved structure of Vivaldi antenna, which loads resistance at the bottom of exponential type antenna to improve Voltage Standing Wave Ratio (VSWR) at low frequency, and which opens three symmetrical unequal rectangular slots in the antenna radiation part to increase the gain. The improved Vivaldi antenna size is 150 mm * 150 mm, and the working frequency is 0.8-3.8 GHz (measured VSWR<;2).The experimental results show that the antenna has good directional radiation characteristics within the scope of bandwidth.