SU317994A1 - RESONATOR FOR MEASURING THE DIELECTRIC PERMITTIVITY OF SHEET PATTERNS DIELECTRIC UHF - Google Patents

Description

The invention relates to the field of radio-measuring equipment at ultra-high frequencies (UHF), and specifically to volume-based measuring resonators.

Cavities are known for measuring the dielectric constant of ultrashort dielectric samples on microwave, containing porous short of both ends of the coaxial.

However, the known devices make it possible to determine only the integral value of the dielectric product. The bridges of the entire sample require a strictly defined form and size of the Test 1x samples for accuracy of measurements.

The purpose of the invention is to improve the accuracy of the .muir and u and page.

For this, the length of said resonator is made close to an odd number of half-waves of operating oscillations, and a cross section is made in the middle of the resonator to accommodate the dielectric sample under study.

FIG. 1 shows the proposed device; in fig. 2 - the same, with conical odds, my resonators.

Test. Sample 1 is placed without excess gaps into the cut between the halves of the resonator 2, and the resonant frequency of such a system is determined, which corresponds to an odd number of half-waves

system

Then, without changing the distance between

0 catch of our resonator is removed test

the sample / and the second, which is closest to the first, is measured again; the resonance value is often

The numbers correspond to an odd number of halfs in the system.

Dielectric insulator with impedance

0steyu S in the resonant system is approximate

but increases by a factor of S by a factor of n

l scattering, loading open con, s half of the resonator, and causes a shift

onance frequency.

Know the total electrical length of the reson

clear /, resonance frequency / i in the presence of arr

3a dielectric resonance frequency / a at y

Alenny specimen

We will test the dielectric constant

the sample is determined by the ratio

.M)

/,/.(24}

about

where C is the speed of light in a vacuum. A more accurate measurement of the value of 2 can be obtained by calibrating the device with reference dielectric samples with

Our values of dielectric and permeability.

The recommended field of use of the invention is the frequency range of 1-10 GHz, the range of values of dielectric constant with a sample thickness of 0.1 - 1 mm.

The degree of measurement localization depends on the dimensions of the cross section of the resonators at the site of the sample, and the accuracy of the measurement of the dielectric constant depends on the accuracy of measurement of the resonant frequency l, therefore, on the quality factor of the resonators.

To improve the measurement accuracy, a conic shape of resonators with small cross-sectional sizes at the open ends and

large short-circuited ends of the halves of the resonators (see f. g. 2).

Subject invention

A resonator for measuring the dielectric constant and the D1Electrical Electric microwave samples contained a coaxial segment, closed at both ends of the microwave, characterized in that, in order to increase TOIHHOCTH measurements, the length of the resonator was made close to an odd number of semi-water working oscillations, - and a cross section is made in the middle of the resonator to accommodate the dielectric sample under study.