“…In references [11,12,13,14], many Vivaldi antennas have improved their gain, bandwidth, compact profile, and other characteristics by loading periodic slots, dielectric lens, patch in between two fares of the antenna. Of course, micro-strip antennas are also choices due to low-profile, low cost, and easy-to-integrate properties [15,16,17]. However, the only broadband characteristics cannot meet the increasingly high channel capacity requirements of modern communication systems.…”