Development of a V-band rotman lens using thin-film dielectric

This paper proposed a microstrip Rotman lens which is enables beam steering at mm-wave. The lens which has three beam ports and five array ports has two dummy ports at beam curve in order to reduce multi reflection from inside of the Lens, and side wall of the Lens was minimized. Also array curve is designed without a dummy port in order to reduce insertion loss. The lens which has magnitude deviation less than plusmn2 dB and phase aberration less than plusmn5deg over 58 GHz- 62 GHz has been employed as a feeder of five linear array antennas with spaced 0.6lambda (3 mm), showing beam steering angle of -7deg, 0deg, +7deg and HPBW of 15deg.