Beam Steering Capabilities of a Fully Dielectric Antenna Array

In this paper, the beam steering capabilities of a fully dielectric antenna array made out of Rexolite are investigated. The antenna array, which is designed for W-band frequencies, consists of four dielectric rod antennas fed by a special power divider, which is based on a multimode interference phenomenon. In order to achieve different beam steering angles, different lengths of the dielectric waveguides, feeding the rod antennas are used. Two different beam steering configurations are designed, providing a beam direction of 15° and 8° at 95 GHz. The measured antenna patterns are in good agreement to the simulations with side lobe levels between -6.2 to -10.5 dB.