Microwave dielectric spectra of ferroelectric triglycine sulfate are measured in the littlestudied frequency range from 90 to 150 GHz, and the suppression of low-frequency dielectric anomaly by microwaves at these frequencies is investigated. It is shown that suppression occurs only in the range of non-Debye dielectric dispersion. An additional dispersion mechanism based on the activation-diffusion model of orientational polarization and transit-time effects for quasi-free carriers is proposed to explain the microwave impact.
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An automatic device is described for measuring the frequency response and Q factor of electrodynamic systems in the frequency band from 38 to 78 GHz. An IBM PC/XT computer with an auxiliary interface and a digital to analog converter (DAC) module allow continuously to vary the master oscillator frequency or the geometric dimensions of the investigated system and to obtain the results in graphic form.The development and perfection of SHF devices requires the modernization of old and the design of new electrodynamic systems. They can be frequently analyzed in the laboratory using standard equipment and an IBM PC/XT personal computer to obtain and quickly process the obtained results without resorting to expensive automatic measuring systems [1].An automatic setup for the investigation of various electrodynamic systems in the frequency range from 38 to 78 GHz is shown in Fig. 1.Millimeter-wave power is supplied by a G4-141/142 oscillator O whose output signal was applied to the investigated electrodynamic system through a decoupling attenuator and waveguide feeder. After passing the system, the signal is detected by detector D, amplified by amplifier A, and applied to the external PC controller C2 and simultaneously to an oscilloscope OS (for monitoring and adjustment) as a voltage representing the transfer constant variations.Two deferent investigation techniques were used depending on the electrodynamic system configuration. Variablegeometry systems (such as open two-reflector resonators and their modifications) can be investigated by varying the distance between reflectors [2]. One reflector is permanently fixed to the optical bench and the other reflector is i:-ounted on stand provided with a micrometer drive. This reflector is moved along the optical bench with the aid of step motor ST1 controlled by the PC.By inserting a test sample (absorbing or scattering electromagnetic waves) into the resonant volume of the investigated system by means of the step motor SM2, it is possible to study the field distribution of the excitation wave mode and, by analyzing the transfer constant, to calculate the Q factor from the resonance curve width. With a minimum SM1 step of 5 ~m and a distance between the mirrors of 50 mm, oscillation can recorded with a Q factor of up to 10 4. The minimum step of SM2 is 330 ~m is sufficient to provide a good ;mid distribution pattern. The measurement error is 20-25% and depends mainly on the test object dimensions.Fixed-geometry electrodynamic systems are investigated with the automatic test set operating as a variable frequency oscillator using the auxiliary controller C2 and the digital-to-analog converter DAC.To enable frequency tuning, the G4-141/142 oscillator is provided with one digital and two analog inputs. Using the digital input and changing the oscillator frequency in 10-MHz steps it is possible to measure Q factors of up to 5-10 3. A control voltage AU = 1 V at the analog input allows the oscillator frequency to be varied over a Af = 3 GHz interval. This makes it possible to me...
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