A Gunn Diode Based Self-Oscillating Active Integrated Array Antenna With a Concept for Beamwidth Controllability

This paper presents a self-oscillating active integrated array antenna (AIAA) constructed with two radiating patches. The proposed AIAA has two patch antennas to act as radiators, and a Gunn diode as an active source. Besides, a simple biasing network using shorted stubs and a slit is designed for the Gunn diode without requiring any external circuitry. The performances of the antenna are examined experimentally. The measured results show an effective isotropic radiated power (EIRP) of +5.8dBm with a transmitted power of −5.6dBm at 9.54 GHz. The measured cross-polarization suppression is more than 20 dB. Moreover, a concept of beamwidth controllability employing the proposed array antenna is discussed and confirmed by simulation.