JPS5950601A - Discontinuous matching circuit - Google Patents

Abstract

PURPOSE:To keep simply and accurately the size of a choke groove, by inserting a dielectric to the choke groove so as to constitute the discontinuous matching circuit for decreasing the size of the choke groove. CONSTITUTION:A rotary section 1 and a fixed section 2 are separated mechanically completely to constitute the discontinuous matching circuit electrically continuously. An inlet of the choke groove 7 of the discontinuous section 3 is taken as (d), an end as (f) and a middle point as (e). Further, the length of the choke groove 7 is taken as (l), about 1/epsilon<1/2>.lambdaa/4 (where; epsilon is a specific dielectric constant of a dielectric 8 and lambdaa is the wavelength of propagated radio wave). The dielectric 8 is inserted to the choke groove 7 constituted with a gap between the fixed section 2 and the rotary section 1 to realize accurately the size of the choke groove 7. Then, the size of the choke groove 7 of the discontinuous matching circuit is decreased, and the size of the choke groove 7 is kept simply and accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to discontinuous matching for matching rotating discontinuous circuits.

A conventional device of this type was shown in Figure 1. In the figure, (]) is the rotating part of the circuit, (2) is the fixed part of the circuit, (3) is the discontinuous part of the circuit, and (4) is the entrance of the radio wave (5).
) is a radio wave exit, and (6) is a discontinuous matching circuit. Second
The figure shows a detailed cross section of the discontinuous matching circuit (6). (7) is a choke groove.

The purpose of this heel device is to connect the rotating object connected to the rotating part (1) and the fixed object connected to the fixed part (2) mechanically discontinuously but electrically continuously. I have to.

As is clear from FIGS. 1 and 2, the rotating part (1) and the fixed part (2) are completely separated mechanically, but
It is electrically continuous. This will be explained next. FIG. 2 is a detailed sectional view of the discontinuous matching circuit, and as shown in this figure, the choke groove (7) has an entrance (a), a terminal end (C), and an intermediate point (b).

Also, let the length of the choke groove be L, and L is approximately λa/4 (λ
a: wavelength of propagating radio waves). By the way, point (c) is now electrically completely short-circuited, so the intermediate point (b) is λa /
The choke groove entrance point (a) is further separated by λa/4, resulting in an electrical short circuit. That is, electrically, at the frequency of wavelength λa, the rotating part (1) and the fixed part (2) are not discontinuous at (a) but are completely connected. Therefore, the radio wave of wavelength λa input from the entrance (4) is outputted from the exit (5) as it is.

Since conventional discontinuous matching circuits are configured as described above, the dimensions of the choke groove are determined only uniquely, and there is a drawback that it is impossible to provide a choke groove if there are restrictions on the dimensions. there were. Furthermore, there is a drawback that a mechanical ingenuity is required to realize the choke groove in the cavity between the fixed part and the rotating part.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by inserting a dielectric material into the choke groove, the choke groove dimension can be shortened, and the choke groove dimension can be easily and accurately determined. The purpose is to provide a discontinuous matching circuit that can be maintained.

An embodiment of the present invention will be described below with reference to the drawings. 8th
The figure is a detailed cross-sectional view of the discontinuous matching circuit, similar to FIG. 2, but in this figure, (8) is a dielectric inserted into the choke groove. The other configurations are the same as in FIG. 2.

As shown in FIG. 3, the entrance of the choke groove is denoted by (d), the end by (f), and the middle point by (e). Also, Chiyo one (8
) is chosen as the dielectric constant λa; the wavelength of the propagating radio wave).

By the way, in the dielectric (8), an electrical short occurs at a point (d) where the wavelength of the propagating radio wave is far away. This means that electrically, at the frequency of wavelength λa, the rotating part (1) and the fixed part (
2) is not discontinuous but completely connected in (d). By inserting the dielectric (8) in this manner, the same effect can be achieved with a size of 1/δ of the choke groove (7) when no dielectric is inserted.

Further, according to the present invention, the dielectric material (8) is inserted into the choke groove (7), which was conventionally realized by the gap between the rotating part (1) and the fixed part (2), so that the dimensions of the choke groove are is more accurate and easier to implement.

In the above embodiments, the choke grooves are U-shaped, but S-shaped choke grooves (7) as shown in FIG. 4 may also be used.

As described above, according to the present invention, a dielectric material is inserted into the choke groove to form a discontinuous matching circuit, so that the choke groove dimension can be shortened and the choke groove dimension can be maintained easily and accurately. It has the effect of

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional discontinuous matching circuit, FIG. 2 is a detailed cross-sectional view of a conventional discontinuous matching circuit, and FIG. 8 is a detailed cross-sectional diagram of a discontinuous matching circuit according to an embodiment of the present invention. FIG. 4 is a detailed cross-sectional view of an S-shaped choke groove showing another embodiment of the present invention. (1)・・・・・・Rotating part, (2)・・・・・・
...Fixed part, (3)...Discontinuous part, (
4)・・・・・・・・・Entrance, (5)・・・・・・・・・
・Outlet, (6)...Discontinuous matching circuit, (
7)・・・・・・Choke groove, (8)・・・・・・
...Dielectric material Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Makoto Kuzuno - Figure 1

Claims (1)

[Claims] A discontinuous matching circuit in which mechanically separated discontinuous circuits are electrically matched by choke grooves, characterized in that a dielectric material is inserted into the choke grooves.