A Vivaldi antenna with adjustable in-band notched characteristic

This paper presents a compact Stepped-impedance resonators (SIR) Vivaldi antenna for in-band notch adjustable characteristics. The main purpose of this design is the presentation of three parameter such as notch frequency adjustable, multi-band notch, stable gain. To avoid potential interferences, The proposed antenna has the capability to operate over the bandwidth 1.67–7GHz at return loss < −10 dB, except the bandwidth of 3GHz for RL(Radio location). A adjustable notched band of 5.15–5.825GHz for rejection of 802.11a radio signals can also be obtained by adjusting the geometry of the Stepped-impedance resonators (SIR). The antenna is successfully designed and simulated, it showing broadband matched impedance, stable gain and radiation pattern over a operating bandwidth.