An Ultra-Wideband Antipodal Vivaldi Antenna at 0.8–30.5 GHz

This paper presents a novel ultra-wideband antipodal Vivaldi antenna that operates across a frequency range of 0.8 to 30.5 GHz. The proposed antenna features an elliptical director, two radiating arms designed in inclined “Z” shapes, and serrated slots. Adding the elliptical director enhances the antenna’s directivity and gain at higher frequency. Symmetrical “Z”-shaped slots on both sides of the radiating arms and serrated slots at the bottom edge are implemented to improve impedance matching at lower frequency. Simulation results indicate that the S<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> of the antenna is below −10 dB in the frequency band of 0.8 to 30.5 GHz, with a maximum gain of 15.5 dBi. Furthermore, the radiation patterns display excellent symmetry and directivity within the operating frequency band, highlighting the antenna’s superior radiation performance.