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A double-stage injection-locked oscillator for optically fed phased array antennas

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5 Author(s)
Berceli, T. ; Center for Microwave-Lightwave Eng., Drexel Univ., Philadelphia, PA, USA ; Jemison, W.D. ; Herczfeld, P.R. ; Daryoush, A.S.
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In an optically fed phased array antenna system, the microwave carrier signal is transmitted via a modulated lightwave to each active T/R (transmit/receive) module, where it must be converted back to the microwave domain. Currently, efficient optical-to-microwave conversion is extremely difficult, as the detected microwave signal is weak and noisy. A novel circuit, containing a high-gain/low-noise microwave injection-locked oscillator, has been developed to improve the interface between the optical and microwave components. The circuit utilizes two FETs and a dielectric resonator, which serves as a frequency-dependent feedback element. The circuit, designed to operate at about 8 GHz, provides significant amplitude and phase noise suppression. In addition, the circuit realization is compatible with MMIC technology

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:39 ,  Issue: 2 )