A Novel Pattern-Reconfigurable Oscillating Active Integrated Antenna

A new topology to reconfigure the radiation pattern in feedback-type oscillating active integrated antenna (AIA) is proposed and demonstrated in this letter. The proposed active antenna consists of an array of two patch elements as a passive radiator integrated with an active device to form a feedback-type oscillating active antenna. Three states (main beam at θ = 0°, +30°, and -30°) of the broadside radiation pattern are obtained. Oscillations are stable in all the states. The proposed structure is fabricated and tested; measured results verify the antenna operation in all three states of the radiation pattern. The proposed structure is suitable for power-combining application at millimeter-wave frequencies.