A Sparsely Six-arm Spiral Phased array antenna for W-band applications

In this paper, a sparsely phased array antenna based on six-arm spiral arrangement is proposed for W-band applications. The proposed antenna element consists of a double-layered stacked patch fed by coaxial probe. In order to reduce the element number of the antenna array while maintaining wide scanning angle and low sidelobe, a six-arm array configuration is developed as a substitution of the conventional rectangular array. A prototype of the six-arm spiral array is simulated at 94GHz band. The simulation results exhibit a maximum gain of 28.5dBi with a scanning angle of 30°. By using the six-arm spiral array design, the proposed antenna can achieve 30 degree scanning range with gain loss less than 1.6dB.