SU1231474A1 - Cell for measuring dielectric characteristics of materials - Google Patents

Abstract

This invention relates to a microwave microwave measurement technique. The invention improves the accuracy of measurements on samples of ultralow volume. The device contains a rectangular waveguide pass-through resonator (DPRS) 1, designed for oscillations of type H 101, limited at the ends by diaphragms 2. DPRD 1 is equipped with communication holes 3 with a waveguide path, an opening 4 in the narrow wall of DPR 1, through which the sample holder is inserted , made in the form of a thin metal rod (MS) 5, perpendicular to a narrow wall. One end of MC 5 is electrically connected with a plug 6 that completely closes opening 4. At the other end of MC 5, a cup (C) 7 of a low-loss dielectric is fixed. At the bottom of H 7, there is a hole 8 with a diameter of 3/4 of the cross section of the sample 9. The height of H 7 is no more than 1/10 of the height of the sample 9. 1 Il. (L to with f sj,

Description

one

1231474

The invention relates to microwave microwave measurement technology and can be used to measure the dielectric characteristics of materials, including at ultra-small dimensions.

The aim of the invention is to improve the accuracy of measurements of dielectric characteristics of materials on samples of ultralow volume.

The drawing shows a cell design for measuring the dielectric characteristics of materials.

The cell contains a rectangular waveguide pass-through resonator 1, designed for an H 101 oscillation type, bounded at the ends with diaphragms 2 provided with communication holes 3 with a waveguide path, hole 4 in the narrow wall of a rectangular waveguide pass-through resonator 1, through which the sample holder is inserted made in the form of a thin metal rod 5, perpendicular to a narrow wall, one end of which is electrically connected with a plug 6, completely covering the opening 4 in the wall, and a cup 7 of d electrician with small losses in the bottom of which holds additional hole 8 with a diameter constituting 75% yushim sectional area of the sample 9 is not in contact with the bottom of the cup 7, the height of which is not more than 10% of the height of the sample 9.

The cell for measuring the dielectric characteristics of the materials operates as follows.

At the beginning, in the rectangular waveguide pass-through resonator 1 there is a holder without a sample 9. The resonant frequency and the quality factor of the system, the rectangular waveguide-pass-holder resonator, are measured. Then sample 9 is inserted into it, placed in the cup 7 at the end of a thin metal rod 5. Measure the resonant frequency. according to the formula

p - Li ° ±. t,

+ 1

 V ..r 2 vr we find the dielectric permeability of the material of the sample 9, and by measuring the quality factor by the formula

 Y.l (1 4V e Q

one

- 4y. f tg & sample material 9,

- Q-J

VNII1Sh

Order 2562/51

Random polygons pr-tie, g

where r

five

0

five

f v

V e tp, 5 Q Qo A

the resonant frequency of the system is a rectangular waveguide pass-through holder-holder;

the resonant frequency of the system is a rectangular waveguide feed-through resonator-holder — sample 9; the volume of the rectangular waveguide bore cavity 1; sample volume 9; dielectric constant of sample material

the dielectric loss tangent of the sample material;

the system Q-factor of the rectangular waveguide pass-through resonator-holder - image 9; Q-system rectangular waveguide pass-through resonator-holder.

Claims (1)

Formula isobteni A cell for measuring the dielectric characteristics of materials, comprising a rectangular waveguide pass-through resonator equipped with a hole in the side wall in which A sample holder is introduced, characterized in that, in order to improve the measurement accuracy of the characteristics of materials on a sample of ultralow volume, the opening is made. in the narrow wall of the rectangular waveguide through-pass cavity, and the sample holder is made in the form of a TOHKOJ-O metal rod perpendicular to the narrow wall, one the end of which is in electrical contact with an inserted plug placed in the hole, and at the other end the sample holder is fixed, made in the form of a dielectric cup with low losses, in the bottom of which an additional hole is made, while the cross-sectional area of the additional hole is not less than 3/4 of the sample area, and the height of the cup is not more than 1/10 of the height of the sample. Irazh 728 Subscription Uzhgorod, st. Project, 4