RU213299U1 - Ultra wideband dielectric washer - Google Patents

Abstract

The utility model relates to the field of microwave technology, namely to the elements of the microwave coaxial path, and can be applied in various devices, the designs of which use round coaxial waveguides (CHF). The technical result is to provide a higher stability of the electrical characteristics of the KKV, in which the proposed dielectric washer will be used. Annular grooves are made in the ultra-wideband dielectric washer with a through central hole and longitudinal holes, and the supporting elements of the side surface are formed using arcuate through longitudinal holes. The value of the relative permittivity of the washer material is chosen to be less than 3.2, and the central hole is made threadless with the possibility of providing a press fit of the CVC inner conductor. 1 w.p. f-ly, 4 ill.

Description

Technical field

The utility model relates to the field of microwave technology, namely to the elements of the microwave coaxial path, and can be applied in various devices, the designs of which use round coaxial waveguides (CHF).

State of the art

An insulator is known (US patent No. 6816040, IPC H01P 3/06, publ. 09.11.2004) of a coaxial transmission line, made of a hollow washer of electrically insulating material, having sets of rotationally symmetrical external cavities around the perimeter of the washer, and the washer has a central hole for the conductor and sets of rotationally symmetrical internal cavities, wherein the internal cavities are located between the central conductor hole and the outer cavities, with the center of gravity of the internal voids located on the midline between pairs of adjacent outer cavities.

The disadvantage of this device is the low consistency, which is a consequence of the lack of grooves in the design, which also leads to a limitation of the frequency range of the air CCM.

The closest technical solution to the claimed utility model is an insulator (CN patent no. on the washer wall there are a plurality of radially extending support elements distributed at intervals along the circumferential direction.

The disadvantage of this insulator is the low stability of the electrical characteristics (in particular, S-parameters) of the devices in which it will be used. The low stability of the electrical characteristics, in turn, is caused by the low mechanical stability of the known device when mating with the inner conductor, and is due to the presence of a thread in its central hole and on the mating surface of the central conductor.

The technical result of the proposed utility model is to ensure a higher stability of the electrical characteristics of the KKV, in which it will be used, while expanding the range of its operating frequencies towards the microwave.

The technical result is achieved due to the fact that in an ultra-wideband dielectric washer with through longitudinal holes, one of which is central, and the others are equidistant from its axis, on both sides of the bases of which annular grooves are made, and the supporting elements of the side surface from the side of the bases of which are formed using arcuate through longitudinal holes, and which is made of a polymeric dielectric material, according to the proposed solution, the value of the relative dielectric constant of the material is less than 3.2, and the central hole is made threadless with the possibility of providing a press fit of the inner conductor.

In a particular case, Ultem Pei 1000 or Rexolite 1422 is used as a polymeric dielectric material in an ultra-wideband dielectric washer (hereinafter referred to as the washer).

The utility model is illustrated by drawings, where

in fig. 1 is a top view of the washer;

in fig. 2 - section of the washer A-A;

in fig. 3 - longitudinal axial section of the coaxial transition with the inventive washer, where a press fit for the inner conductor is used;

in fig. 4 shows the results of measuring the frequency dependence of the amplitude of the reflection coefficient S11 and the gain S12 of the coaxial junction.

In the inventive washer (Fig. 1) with a through central hole 1 and longitudinal holes 2, annular grooves 3 are made, and the supporting elements 4 of the side surface are formed using arcuate through longitudinal holes 5.

In the coaxial transition (Fig. 3), the coaxial retention of the outer conductor 6, formed by the inner cylindrical surfaces of the body and ring 7, relative to the inner conductor 8, is ensured by a press fit of the latter in the washer 9.

In FIG. 4 shows the results of measuring the frequency dependence of the amplitude of the reflection coefficients S11 and transmission S12 of the coaxial junction, in the design of which the inventive dielectric washer is used, where it is demonstrated that in the range from 0 to 67 GHz the reflection coefficient does not exceed the value of minus 25 dB, the value of the transmission coefficient is not more than minus 0.2 dB, without resonances of higher modes.

Implementation of the utility model

The upper cut-off frequency (critical) of the air-filled KKV operation is determined by the frequency at which the first highest mode of oscillation in the air space between the external 6 and internal 8 conductors of the KKV is possible, respectively.

The theoretical value of this critical frequency (in the perpendicular section of the CCF) is determined by the formula

- скорость распространения электромагнитных волн в вакууме;where

- speed of propagation of electromagnetic waves in vacuum;

- диаметр внешнего проводника ККВ;

- diameter of the outer conductor of the KKV;

- диаметр внутреннего проводника ККВ;

- diameter of the inner conductor of the KKV;

- эффективная диэлектрическая проницаемость пространства между проводниками в сечении ККВ.

- effective permittivity of the space between the conductors in the cross section of the KKV.

The table below shows the values of the cutoff operating frequencies for an air CCM with a wave impedance of 50 ohms and standard conductor cross-sectional dimensions, regulated by the IEEE Std 287-2007 standard.

Table - The values of the boundary operating frequencies for air CCM according to the regulations of the IEEE Std 287-2007 standard Cross-sectional diameters of KKV, mm Theoretical value of the upper limiting frequency, GHz Regulated value of the upper operating frequency, GHz The difference between the theoretical and regulated values of the upper operating frequency, GHz outer conductor inner conductor 7 3.04 19.4 eighteen 1.4 3.5 1.52 38.8 33 5.8 2.92 1.27 46 40 6 2.4 1.04 56.5 fifty 6.5 1.85 0.804 73.3 65 8.3 one 0.434 135.7 110 25.7

The table shows that with an increase in the operating frequency, the difference (not used frequency range) between the value of the theoretically possible frequency of operation of the air CCM and its regulated value increases.

This is due to the fact that in practice purely air CCIs are used extremely rarely, and instead CCIs with partial or complete dielectric filling are widely used, since it is structurally necessary to keep the inner conductor 8 coaxially centered relative to the outer 6, for which dielectric washers 9 are used. And this , in turn, leads to a significant decrease in the critical frequency.

в ККВ с частичным диэлектрическим заполнением (при фиксированных значениях размеров сечения его проводников 6 и 8) является уменьшение значения эффективной диэлектрической проницаемости

на отрезке ККВ, занимаемым шайбой 9.It can be seen from the formula that the only possible way to approximate the operating frequency to the theoretical

in a KKV with partial dielectric filling (for fixed values of the cross-sectional dimensions of its conductors 6 and 8) is a decrease in the value of the effective permittivity

on the KKV segment occupied by washer 9.

определяется значениями относительных диэлектрических проницаемостей воздуха и используемого материала шайбы, а также её геометрическими параметрами.In air CCI with partial dielectric filling, the value

is determined by the values of the relative permittivity of air and the washer material used, as well as its geometrical parameters.

шайбы 9.In the first approximation - the smaller the dielectric material, the lower the value of the effective permittivity

washers 9.

Therefore, in its design, it is necessary to use a polymeric dielectric material with the lowest value of the relative permittivity, as well as to use as little of it as possible, while ensuring acceptable electrodynamic (in particular, matching with CCI), mechanical and technological (such as repeatability in the manufacture , ease and convenience of assembly) characteristics.

A suitable washer material should be Ultem Pei 1000 or Rexolite 1422, which has a relative dielectric constant of less than 3.2, which is the lowest among similar dielectrics.

и выполнения в ней центрального отверстия безрезьбовым, при обеспечении более высокой стабильности электрических характеристик ККВ позволяет расширить диапазон рабочих частот ККВ сечением 1,85/0,804 мм, относительно значения 65 ГГц регламентируемого стандартом IEEE Std 287-2007 на 2 ГГц.Thus, the design of the proposed dielectric washer, by reducing the effective dielectric constant

and making the central hole in it threadless, while ensuring higher stability of the electrical characteristics of the CCM, it allows to expand the operating frequency range of the CCM with a cross section of 1.85 / 0.804 mm, relative to the value of 65 GHz regulated by the IEEE Std 287-2007 standard to 2 GHz.

Claims (2)

1. An ultra-wideband dielectric washer with through longitudinal holes, one of which is central, and the others are equidistant from its axis, on both sides of the bases of which annular grooves are made, and the supporting elements of the side surface on the side of the bases of which are formed using arcuate through longitudinal holes, and which made of a polymeric dielectric material, characterized in that the value of the relative dielectric constant of the material is less than 3.2, and the central hole is made without thread with the possibility of providing a press fit of the inner conductor. 2. An ultra-wideband dielectric washer according to claim 1, characterized in that Ultem Pei 1000 or Rexolite 1422 is used as a polymeric dielectric material.

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