The Q-band low noise reference oscillator based on bipolar transistor designed for the pulse ESR spectrometer

The construction of the low noise Q-band reference oscillator based on the voltage controlled bipolar GaAs transistor for the transmitter of pulse microwave (MW) bridge designed for the pulse electron spin resonance (ESR) spectrometer has been presented. The application of the reference MW oscillator, which consists of a quartz crystal oscillator, frequency synthesizer and a low-noise GaAs bipolar transistor, instead of klystron or Gunn oscillator, results in the improvement of the phase and frequency noise of the pulse ESR spectrometer, which makes it well suited for the dating and diagnostics of the biomaterials by pulse ESR methods.