A design of miniaturized Vivaldi antenna for UWB applications

In this letter, a stripline fed Vivaldi antenna with more than 7:1 bandwidth is presented. With tapered slot edges and resonant cavity, the presented antenna has the capacity to extend the low-end bandwidth limitation and improve the radiation characteristics in the lower frequencies. In addition, rectangular patches are stuck on the antenna in the flare edge to enhance the antenna's radiation. The simulated results show that good radiation patterns with gain 1.6 to 9.9 dBi in the end-fire direction could be achieved in the whole working band, which covers 1.32GHz to 9.88GHz (S
₁₁
≤ -10dB). Due to its good radiation performance of the proposed antenna, it can be used for ultra-wideband systems which work in S and C bands.