13 November 1998 Tunable narrowband microwave radiation source based on a frequency-locked superlattice oscillator
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We report on the generation of tunable ultra-narrowband microwave radiation using a frequency locked superlattice oscillator fabricated in a planar design. As active device, a wide-miniband GaAs/AlAs superlattice was used, showing, at room temperature, self-sustained current oscillation giving rise to microwave generation at a natural frequency near 5 GHz and ultraharmonics up to the 7th order; the linewidth of the harmonics was near 1 MHz. We observed a drastic reduction of the linewidths to less than 10 Hz by frequency locking the oscillator (approximately 100 (mu) W) with a weak narrowband driving field (approximately 0.1 (mu) W). The oscillator was tunable within a locking range of 1 percent of the natural frequency. Besides harmonic also subharmonic locking was observed.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Klaus Hofbeck, Ekkehard Schomburg, Karl F. Renk, D. G. Pavel'ev, Yu Koschurinov, B. Melzer, Sergei I. Ivanov, Petr S. Kop'ev, "Tunable narrowband microwave radiation source based on a frequency-locked superlattice oscillator", Proc. SPIE 3465, Millimeter and Submillimeter Waves IV, (13 November 1998); doi: 10.1117/12.331191; https://doi.org/10.1117/12.331191



Microwave radiation

Linear filtering



Spectrum analysis

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