High gain reconfigurable millimeter-wave dielectric resonator antenna

In this paper, a high-gain reconfigurable dielectric resonator antenna (DRA) at the millimeter wave (MMW) frequency band is presented. This antenna offers a gain enhancement 6dB over a conventional DRA and a reconfigurable radiation pattern in the entire azimuth plane. To produce these features, the proposed antenna uses a new reconfigurable frequency-selective surface (FSS) unit-cell. The reflection and transmission characteristics of the proposed FSS unit-cell structure are investigated. Results show that by controlling the state of diodes in each unit-cell, the transmission and reflection bands can be changed. Therefore, by changing state of the diodes, beam steering can be achieved in the entire azimuth plane.