JPH064625Y2 - Case structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A housing structure for mounting a signal system circuit section, a bias system circuit section, and a coaxial waveguide conversion section of a radio device in an ultra-high frequency band,
A circuit section in which a signal system circuit mounting recess is provided on one surface and a bias system circuit mounting recess is provided on the other surface, and a coaxial conversion section housing fitting section is formed in which a longitudinal end portion in which the bias system circuit mounting recess is formed is cut out. A casing and a coaxial conversion unit casing provided with a coaxial conversion unit mounting recess fitted to the coaxial conversion unit casing fitting unit, and the coaxial conversion unit casing fitting portion of the circuit unit casing has a coaxial conversion unit casing Screw it so that one of the openings is on the outside,
By mounting the signal system circuit on the upper part of the circuit unit housing and the bias system circuit on the lower part, the coaxial waveguide conversion unit and the signal system circuit and the bias system circuit are independent, so the characteristics due to mutual interference due to radio wave leakage. It has a structure that can prevent obstacles and does not require precision finishing of the housing, reducing the processing man-hours.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a housing structure for mounting a signal system circuit section, a bias system circuit section, and a coaxial waveguide conversion section of a wireless device.

In recent years, with the recent advances in wireless communication, the frequencies used in these communication devices are becoming higher and higher (microwaves with short wavelengths, millimeter waves, etc.). Therefore, in order to prevent radio wave leakage between the signal system circuit, the bias system circuit, the coaxial waveguide conversion circuit, and the like that compose these devices, each circuit has a shielded housing structure. In the housing structure, if the contact part is not finished accurately, a gap will be created, and radio waves may leak from this gap.To eliminate the gap at this contact part, a lot of man-hours are required for finishing, so precise finishing is required. There is a demand for the appearance of a housing structure that can eliminate radio wave leakage with an unnecessary structure.

[Conventional technology]

FIG. 2 is a diagram for explaining a conventional housing structure, FIG. 2 (a) is a front view showing a cross section, FIG. 2 (b) is a side view, and FIG. 2 (c) is an exploded perspective view.

In the figure, a signal system circuit mounting recess 11 and a coaxial conversion unit mounting recess 12 are formed by notching the signal system circuit mounting recess 11 and the rear end of the signal system circuit mounting recess 11 and are provided with a plurality of screw holes on the back surface.
13 High frequency housing 1 provided and bias system circuit holes 21, 21 '
And a bias circuit unit housing 2 provided with a plurality of holes (eight holes are shown in the drawing) 22.

Then, the signal system circuit mounting recess 11 of the high frequency unit housing 1 is formed.
The signal system microwave circuit board 5 is mounted on the circuit board, and the low frequency circuit board 5'of the bias system circuit is mounted on the back surface of the signal system circuit mounting recess 11. Both circuit boards 5 and 5'are insulated by glass. The coaxial waveguide conversion unit and the signal system circuit unit are connected by the coaxial converter 10.

Further, a glass-insulated output terminal 6'for taking out an output from the microwave circuit board 5 is attached and connected to the side wall of the high-frequency housing 1 opposite to the side where the coaxial converter mounting recess 12 is formed.

Then, the bias system circuit unit holes 2 and 21 'of the bias system circuit unit housing 2 are aligned with the bias system low frequency circuit board 5'of the high frequency unit housing 1 and screwed with the tightening screw 7. After that, a signal system circuit cover 3 and a bias system circuit cover 4 are attached.

[Problems to be solved by the invention]

In the above-mentioned conventional housing structure, since the high-frequency housing and the bias system circuit housing that are divided into two parts are screwed together, the contact surfaces of these screwed housings are smooth common surfaces. There is a risk that a gap will be created, and if a gap is created, radio waves will leak between the bias system circuit section and the coaxial conversion section mounting recess, that is, the waveguide section, and the characteristics will be adversely affected by mutual interference resulting from this radio wave leak. Therefore, in order to eliminate this gap, the contact surfaces of the individual housings must be precisely finished, which requires a lot of man-hours.

[Means for solving problems]

The present invention provides a housing structure that solves the above problems and eliminates radio wave leakage with a structure that does not require precision processing.

That is, the housing structure for mounting the signal system circuit section, the bias system circuit section and the coaxial waveguide conversion section is provided with the signal system circuit mounting recess on one surface and the bias system circuit mounting recess on the other surface. A circuit unit housing provided with a coaxial conversion unit housing fitting portion in which a longitudinal end portion in which a system mounting recess is formed is cut out;
The coaxial conversion unit housing is provided with a coaxial conversion unit mounting recess fitted to the coaxial conversion unit housing fitting unit, and one of the opening surfaces of the coaxial conversion unit mounting recess of the coaxial conversion unit housing is outside. In addition, it is solved by being screwed to the coaxial conversion portion housing fitting portion of the circuit portion housing.

[Action]

In this way, because it is composed of the circuit unit housing and the coaxial conversion unit housing, there is no contact surface between the circuits, so the housing does not require precise finishing accuracy, the processing man-hour is reduced, and the radio wave leakage is eliminated. It is possible to prevent adverse effects on the characteristics.

〔Example〕

FIG. 1 is a view for explaining an embodiment of the present invention, and FIG.
Is a front view showing a cross section, (b) is a side view, (c) is an exploded perspective view, and the same portions as those in FIG. 2 are denoted by the same reference numerals.

In the figure, a signal system circuit mounting recess 81 and a bias system circuit mounting recess 82, 8 are formed on the back surface of the signal system circuit mounting recess 81 made of metal such as brass.
2'is bored, and the coaxial conversion portion housing fitting portion 83 is formed by notching the longitudinal end portions in which the bias system circuit mounting concave portions 82, 82 'are formed.
And a plurality of screw holes 85 are provided at positions corresponding to the holes 92 formed in the coaxial conversion unit housing 9 at the contact portion of the coaxial conversion unit housing 9 of the coaxial conversion unit housing fitting portion 83. Circuit housing 8
And a coaxial conversion section housing 9 provided with a plurality of (four in the drawing are shown) holes 92.

Then, as shown in FIG. 1 (a), the coaxial conversion unit housing 9 is
An independent waveguide portion is formed by screwing with the tightening screw 7 such that one of the opening surfaces of the coaxial conversion portion mounting recess 91 is on the outside.

In this way, the signal system circuit mounting recess 81 of the circuit housing 8 is formed.
A plurality of (three in the drawing) microwave substrates 5 are mounted on each of them, and the low frequencies of the bias system are respectively provided in the bias system circuit mounting recesses 82 and 82 ′ formed on the back surface of the signal system circuit mounting recess 81. The circuit board 5'is mounted, both circuit boards 5 and 5'are connected by the terminals 6 insulated with glass, and further, at the boundary portion 84 between the signal system circuit mounting recess 81 and the coaxial conversion unit housing fitting portion 83. ,
Attach the coaxial converter 10.

Further, the coaxial conversion portion housing fitting portion formed on the circuit portion housing 8
An output terminal 6'insulated by glass for extracting the output of the microwave circuit board 5 is attached and connected to the recess 81 on the opposite side of the circuit 83 where the signal system circuit is mounted, and the signal system circuit cover 3 and the bias system circuit cover are connected. Since it is hermetically sealed at 4, each circuit section becomes an independent form, and it is possible to eliminate radio wave leakage.

In this embodiment, the case is described by using brass, but not limited to brass, other conductive metals such as copper may be used.

[Effect of device]

As is clear from the above description, according to the present invention, the housing structure is composed of the circuit unit housing and the coaxial conversion unit housing, so that the number of processing steps of the housing can be reduced and the cost can be expected to be reduced, and the electric wave leakage can be eliminated. It is extremely effective in improving reliability.

[Brief description of drawings]

FIG. 1 is a view for explaining an embodiment of the present invention, and FIG.
Is a front view showing a cross section, (b) is a side view, (c) is an exploded perspective view, FIG. 2 is a view for explaining a conventional housing structure, and (a) is a front view showing a cross section, (b) is a side view and (c) is an exploded perspective view. In the figure, 1 is a high frequency unit housing, 2 is a bias system circuit unit housing, 3 is a signal system circuit unit cover, 4 is a bias system circuit unit cover,
5 is a microwave circuit board, 5'is a low frequency circuit board, 6,
6'is a terminal insulated with glass, 7 is a tightening screw, 8 is a circuit unit housing, 9 is a coaxial conversion unit housing, 10 is a coaxial converter, 11,
81 is a signal system circuit mounting recess, 12 and 91 are coaxial conversion unit mounting recesses, 13 and 85 are screw holes, 21 and 21 'are bias system circuit unit holes,
Reference numerals 22 and 92 are holes, 82 and 82 'are bias system circuit mounting recesses, 83 is a coaxial conversion portion housing fitting portion, 84 is a boundary portion, and 85 is a screw hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Shown 60-163775 (JP, U) Shown 59-81084 (JP, U) Shown 59-26676 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A housing structure for mounting a signal system circuit section, a bias system circuit section, and a coaxial waveguide conversion section, a signal system circuit mounting recess (81) on one surface, and a bias system circuit mounting on the other surface. Recesses (82, 82 ') are provided, and the bias system mounting recesses (82, 8') are provided.
2 ') forming a circuit section housing (8) provided with a coaxial conversion section housing fitting section (83) notched in the longitudinal direction end, and a coaxial fitting into the coaxial conversion section housing fitting section (83) The coaxial conversion unit housing (9) provided with the conversion unit mounting recess (91) is configured so that one of the opening surfaces of the coaxial conversion unit mounting recess (91) of the coaxial conversion unit housing (9) is on the outside. A housing structure characterized by being screwed into a coaxial conversion portion housing fitting portion (83) of the circuit portion housing (8).