Yu. A. Dryagin

A method to measure dielectric parameters in 5–0.5 millimeter wavelength band

The method to measure parameters of dielectric plates by placing them into the Fabry-Perot resonator is modified to provide, relative accuracies: for the resonance frequency of the plate 10−6; for the refractive index and the plate thickness 10−4–10−5; for the loss tangent 5%. Tje values of loss tangent which can be measured are from 10−6 to 10−1. The device calibration is performed by a gas frequency standard in 5–0,5 mm wavelength band.

A notch filter for 140 GHz microwave radiation

The construction of a notch-filter for 140 GHz with very low passband insertion loss is described. It is based on a single-mode rectangular waveguide and cylindrical cavities matched to it. The typical transmission characteristic is also presented.

Submillimeter-wave receiver with a balanced monolithic mixer

We describe the design of a superheterodyne receiver with a balanced monolithic integrated mixer and describe the technique and results of parameter measurements of the receiver and mixer over the frequency range 287–365 GHz. In the middle of this range, the double-band noise temperature of the receiver is 1500±50 K, while the double-band noise temperature and conversion loss of the mixer are 1250±50 K and 10±0.5 dB, respectively. Comparison with mixers and receivers of other types is performed.

System for measuring collective scattering spectra for thermonuclear plasma diagnostics

The design and arrangement of a detection system for measuring spectra, using a 140 GHz gyrotron as the probe-radiation source, developed for investigating collective Thomson scattering in plasma are discussed. The measurement procedure and examples of the results obtained are presented.

Improving the Efficiency of Single-Sideband Millimeter-Wave Reception by Returning the Signal Converted into Image

We describe the technique, apparatus, and the results of studies of the possibility of millimeter-wave single-sideband reception with minimum loss, associated with conversion into image. The single-sideband noise temperature of the receivers is improved by a factor of 1.4-1.9 in the N and Y bands.

Clear-air millimeter-wave scattering

Clear-air millimeter-wave backscattering is observed experimentally by means of a high-power gyrotron generator and a superheterodyne receiver.

A bench for precision measurement of rejection-filter frequency characteristics in the 2-mm wave band

The circuit and parameters of a measuring bench for precision measurement of the amplitude-frequency responses of four-pole networks in the 140-GHz band are discussed. Owing to the use of a sensitive superheterodyne receiver and radiation sources stabilized in frequency by a quartz frequency standard, the measuring bench provides a dynamic range no less than 120 dB and accuracy of frequency reading better than 1 MHz.