Single Ridged Waveguide Based Resonant Slotted Antenna Array for Millimeter Wave Radar Application

Abstract

A new single ridged waveguide based resonant slotted antenna array for millimeter wave radar application is proposed. The single ridged waveguide is formed by PCB substrate with upper copper foil at the bottom and aluminum structure at the top. Resonant slots are placed along the centerline of the single ridged waveguide's broad wall to obtain a stable and symmetric radiation pattern. By changing the depths at both sides of the ridge, electric neutral plane shifts from the centerline and the current can excite the resonant slot leading to radiation. A protype is designed, and the impedance bandwidth is from 75.94 GHz to 81.21GHz (6.7%). The sidelobes level is lower than 25dB within the entire bandwidth. Horizontal beam angle is ±62°. and vertical beam deviation angle is ±2°. Moreover, the proposed antenna is easy fabrication, high efficiency (95%) and low cost.