Gain Enhancement Technique of Vivaldi Antenna

This paper proposes a gain enhancement technique for Vivaldi antenna design, which is used for the X-band. A conventional Vivaldi antenna is composed of an exponentially open slot line and a micro strip line impedance transformation structure and a slot line widening deformation structure at the coupling point. The gain enhancement technology is to load resistor at the end of the coupling gap to improve the bandwidth, and set a quarter wavelength linear gradient gap between the gaps in the metal area on both sides of the antenna to improve the gain. The proposed antenna has a peak gain of 10.5 dB and a bandwidth of 6.5 GHz, which ranges from 5 GHz to 11.5 GHz and meets the X-band standards. The design with enhanced gain, high radiation efficiency, great radiation pattern and compact size is simulated. The results verify the feasibility of the design.