SIW-Fed Vivaldi Array for mm-Wave Applications

Abstract

This paper presents a 1×8 SIW fed Vivaldi antenna array with the size of 56mm×46mm, which provides high gain of more than 15 dBi at the mm-wave frequencies from 32.5 GHz to 39.5 GHz. A single SIW-fed Vivaldi element is first proposed, which has a bandwidth of 26.5–40 GHz with an average gain of ~6.5 dBi. This antenna element is then utilized to construct a 1 × 8 linear array matched to a 50Ω impedance by a T-junction SIW power divider. The characteristics of proposed antenna array are thoroughly investigated. The wide bandwidth and high gain along with the excellent performance of the proposed 1 × 8 antenna array makes it an excellent candidate for future mm-wave applications.