A low-profile, decade bandwidth, tightly-coupled Vivaldi phased array

摘要

For the conventional tightly-coupled Vivaldi antenna array, the high profile limits its application on compact system. In this paper, a novel low profile tightly-coupled Vivaldi phased array is presented. It can reduce the height by 60% while maintaining the same operating frequency band and wide scan performance. Twin flared notches and U-shaped polls are the main methods to achieve the low profile structure. A single layer dielectric radome is also employed for better impedance match. The antenna unit is fed directly by a 50Ω stripline. Simulation results show that the low profile antenna array achieves a 10:1 bandwidth (1.8-18 GHz) and scans up to 30°.