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SUMMARYAn ultrasmall active integrated antenna 2.5 cm square was fabricated by combining an MMIC oscillator and planar slot antennas. The design of array antennas by simulation and analysis of their injection locking characteristics are presented. Beam steering and the effect of packaging are considered in the measurement, and the effect of the metal reflector plate behind the array antenna is studied. A small active integrated antenna is placed at the focal point of a parabolic antenna. Its operation as a receiving integrated antenna with a self-oscillating mixer for communication satellite is confirmed.

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One of the radar functions for the active integrated antenna array for beam steering utilizing harmonic injection into an MIMIC oscillator is described in this paper. The fabricated 2 X 2 active integrated antenna array was locked by an external signal at frequency one half with respect to the fundamental operating frequency of the MIMIC oscillator. Its beam steering operation was also confirmed by changing the frequency of the injection signal. A 10 degree beam variation was observed within the injection locking range of 3.90MHz. From these results, the fundamental data for realization of the millimeter-wave radar systems using the MMIC with low-cost and simple structure were obtained.