Quasioptical millimeter wave solid-state generator

Subject and purpose. Open resonant system as the oscillating circuit of the solid-state oscillators and characteristics of the quasi-optical oscillators properly are the object of investigations. Purpose of article is review of works being fulfilled at the solid-state department over period 1979 and to the present day. The intent of the paper is to give the indication prerequisites of the creation of high-stabilized millimeter wave sources and way of this problem solution. Method and methodology. Theoretical and experimental methods of study of main parameters of open resonators with resonant and nonresonant inhomogeneities such as spectrum, field topology of open resonators are the waveguide model of resonator, decomposition method, generalized scattering matrix method, and experimental technique of the power, frequency, and spectrum measurements. Results. Results of study and development of quasi-optical solid-state oscillator are: the level of frequency noise is no more than –115…120 dB/Hz; power of generation at first harmonic is up to 130…150 mW at frequency of 40…50 GHz; at second harmonic – up to 10 mW at 60…90 GHz; generation power is no more than 3 mW at frequency of 150 GHz ; long-term frequency instability is 3×10–8 at active control temperature DТ ~ 0.1 °С. Conclusion. In the paper it is analyzed an application area of solid-state oscillators. They are local oscillators in receiving units and radiometers, refractometry, dielectro-metry, and fields where high stability and low level of frequency noise are needed. The promising lines are inquired, they are search of new physical properties for nonlinear element creating at Terahertz frequency band.