JPS6320901A - High frequency circuit containing device - Google Patents

Abstract

PURPOSE:To reduce the disturbance in the impedance of a conversion section by providing a projection to a connecting part of a containing case so as to constitute the titled device in a way that a part corresponding to an outer conductor of a coaxial line enters into a board for a plane line thereby prolonging the coaxial line. CONSTITUTION:The containing case 1 consists of the projection 2, the center conductor 3 and a dielectric 4 to support it. Then the case 1 has a characteristic impedance satisfying equation as a coaxial line. For example, with a characteristic impedance Z=50ohms, a specific dielectric constant epsilons=9, and an outer diameter (a) of the coaxial line =4mm given, then the diameter (b) (of the center conductor)=0.33mm is obtained. In using a 'Teflon(R)' glass board whose thickness is.e.g., 0.8mm, the projected length of the projection 2 is selected to be a half of the thickness of the board.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a case that houses an electric circuit, and particularly to a relay terminal structure between a case internal circuit and an external circuit in a high wave region.

[Conventional technology]

Conventionally, this storage case was made of metal, and one relay terminal consisted of a terminal with the same potential as the ground of the internal electric circuit and a T terminal that was electrically insulated from the case.
This part is a coaxial line and has passband characteristics from low frequency range to high frequency range, so it is used for amplifiers and oscillators of microwave communication satellites. It was used as a storage case.

[Problem that the invention seeks to solve]

The above-described conventional electric circuit storage case is connected to an external planar line 7 in a configuration as shown in FIG. At the line and connection point of the planar circuit 7, there is no outer conductor part of the coaxial line due to the thickness of the dielectric of the planar circuit 7, and the characteristic impedance is degraded, causing reflection and attenuation of high frequencies, which prevents faithful signal transmission. The drawback was that it couldn't be done. In addition, 1 is a metal storage case, 3 is a center conductor, 4 is a dielectric, 5 is a plane line, and 6
is a dielectric, 8 is a back conductor, and 9 is a conductor.

[Means for solving problems]

An unexploded electric circuit storage device has a metal conductor case, a part of the metal conductor has a hole, the edge of the hole protrudes outside the case, a conductor in the center of the hole, and a dielectric material to hold the center conductor. The gap is filled, and the diameter of the hole, the center conductor, and the dielectric have a certain characteristic impedance.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view of the relay part of the present embodiment.

The storage case 1 is bottomed with a dielectric 4 for holding the protrusion 2 and the center conductor 3, and this part is a coaxial line and has a characteristic impedance that satisfies the following formula.

For example, characteristic impedance z=soo, relative permittivity gs=
9. Outline of coaxial line! ” 4 wg, the center conductor diameter b = Q, 33 m. Also, the protruding length of the protruding portion 2 is, if a Teflon glass substrate with a thickness of 0.8 scale is used, this length will be half the thickness of the substrate. Make it.

〔Effect of the invention〕

The above-described method is inventive in that a protrusion is attached to the connection part of the storage case so that the part corresponding to the outer conductor of the coaxial line enters the plane line board, which lengthens the coaxial line part and causes impedance disturbance in the converter. The power reduction at 1QGHz was reduced from 0.5dB to 0.2dB, and the reflection coefficient was also improved by 15%.

The storage case provided with the relay terminal metal of the present invention is HIC.

It is used to house amplifiers made with ICs, and because there is little loss when connecting these amplifiers to external circuits, they are used in receiving systems for satellite communications where sensitivity characteristics are important.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention. FIG. 2 is a sectional view of a conventional example. 1...Metal storage case, 2...Protrusion, 3...Center conductor, 4...Dielectric, 5
...... Planar line, 6... Dielectric of planar line, 7... Line conductor of planar circuit, 8-...
Back conductor of planar circuit, 9... Connection conductor, a...
...Outer diameter dimension of the relay coaxial section, b...--Center conductor diameter dimension of the relay coaxial section. War 1 dormitory 2t21

Claims (1)

[Claims] A metal conductor case and a part of this metal conductor have a hole, the edge of this hole protrudes outward, a conductor is placed in the center of the hole, and the gap is filled with a dielectric material to hold this conductor, and the diameter of the hole is , a high frequency circuit storage device characterized by having a specific characteristic impedance due to the dimensions of the center conductor and the dielectric material.