A parametric study of microstrip-fed Vivaldi antenna

This paper summarizes the effects of antenna design parameters on its performance. 3D electromagnetic simulation software CST was used to simulate various sizes of three major design parameters. By analyzing several antenna basic parametric results including return loss (S-parameter), voltage standing wave ratio (VSWR), reference impedance and far field gain, a parametric study is presented. It is found that substrate parameters play an important role in antenna performance. In particular, both the resonant frequency and the radiation efficiency can be regulated by flare length and slot width. Then the microstrip-fed Vivaldi antenna was fabricated using FR4 epoxy board with dielectric constant of 4.34 and thickness of 1.6mm. The antenna meets 50Ohm impedance matching and radiation coverage frequency bandwidth is from 800MHz to 1.8GHz.

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