Analysis on locking characteristics of band-stop type of self-injection locked NRD guide Gunn oscillator at 60 GHz

The Q-factor of the band-stop type of self-injection locked NRD (nonradiative dielectric waveguide) guide Gunn oscillator, which consists of a Gunn diode circuit coupled with a high Q ceramic resonator, was calculated as a function of the frequency deviation between the oscillation frequency of the free-running Gunn oscillator and the resonant frequency of the ceramic resonator in the 60 GHz bands. Agreement between the calculated and measured results was reasonably satisfactory, and thus the validity of the analytical procedure was confirmed. And it was obvious that the band-stop type of self-injection locked NRD guide Gunn oscillator has a high Q-factor as well as a low phase noise compared with the reflection type of self-injection locked NRD guide Gunn oscillator.