JPH0983202A - Microwave waveguide device - Google Patents

Abstract

(57) Abstract: A microwave waveguide device including a microwave integrated circuit is downsized and reduced in price. A microwave integrated circuit (1) is mounted on the other surface of a metal block (7) via a metal plate (6). The printed circuit board 3 on which the intermediate frequency signal circuit, the low frequency signal circuit and the power supply circuit are mounted is further mounted on the metal block 7.
Therefore, the microwave circuit including the microwave integrated circuit 1 and the like and the low-frequency signal circuit mounted on the printed circuit board 3 are structurally integrated, and the size of the device is reduced, and the number of parts is reduced due to the integration. Price can be achieved. Further, the metal flat plate 6 and the metal block 7 signal-isolate the microwave signal terminal 1a, the intermediate frequency signal terminal 1b, and the low-frequency signal terminal 1c, which penetrate them, to reduce the characteristic deterioration due to signal interference. ing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave waveguide device including a hermetically sealed microwave integrated circuit, and more particularly to a microwave waveguide device suitable for miniaturization.

[0002]

2. Description of the Related Art A conventional microwave waveguide device of this type will be described with reference to the sectional view of FIG. The microwave waveguide device of FIG. 2 includes a microwave circuit that handles microwave signals or millimeter wave signals (hereinafter collectively referred to as microwaves), and a low-frequency signal circuit that handles low-frequency signals including direct current used for a power supply. Structurally separated, the two are electrically connected by a coaxial cable 28 and a signal line 29.

The microwave circuit comprises a microwave integrated circuit (MIC) 1, a metal flat plate 26, a metal block 27, and a printed board 31. The microwave integrated circuit 1 is a signal processing circuit hermetically sealed with a metal package or the like that uses a microwave signal and an intermediate frequency signal as input / output signals. The microwave integrated circuit 1 has a microwave signal terminal 1a through which a microwave signal passes, an intermediate frequency signal terminal 1b through which an intermediate frequency signal passes, and a low frequency signal terminal 1c through which a low frequency signal including a power source terminal through which direct current passes passes. Below)
Protruding from.

The metal flat plate 26 has the microwave integrated circuit 1 mounted on one surface thereof and one of the wide surfaces of the waveguide 22 formed on a part of the other surface thereof, and has a microwave signal terminal 1a and an intermediate frequency. The signal terminal 1b and the low frequency signal terminal 1c are penetrated from the one surface to the other surface. The metal block 27 has one surface joined to the other surface of the metal flat plate 26 by soldering or screwing,
The intermediate frequency signal terminal 1b and the low frequency signal terminal 1c of the microwave integrated circuit 1 are penetrated from the one surface to the other surface, and at the same time, the other three surfaces of the waveguide 2 are formed.
The microwave signal terminal 1 a is introduced on the inner surface of the waveguide 2. The printed circuit board 31 has the intermediate frequency signal terminal 1
b and a connection relay plate for connecting the low-frequency signal terminal 1c to the coaxial cable 28 and the signal line 29.

The low frequency signal circuit includes a printed circuit board 23 on which an electric component 25 used for a circuit for handling an intermediate frequency signal, a circuit for handling a low frequency signal and a power supply circuit is mounted, and a shield case 30 for shielding the printed circuit board 23. And a shield cover 24. This low frequency signal circuit is connected to the microwave circuit by the coaxial cable 28 and the signal line 29 as described above.

[0006]

In the above-described conventional microwave waveguide device, the microwave circuit and the low frequency signal circuit are structurally separated, and both are connected by a coaxial cable or a connecting line. However, the size of these connecting parts is almost the same as that of the microwave integrated circuit and the printed circuit board having the improved integration degree today, which is a major factor that hinders the miniaturization of the device.

Further, in this microwave waveguide device, since the microwave circuit and the low frequency signal circuit are structurally separated, many mechanical parts are required for the shield circuit and the waveguide, which is expensive. There was a flaw.

[0008]

SUMMARY OF THE INVENTION A microwave waveguide device according to the present invention is a micro-wave device which is hermetically sealed and has a microwave signal terminal, an intermediate frequency signal terminal and a low frequency signal terminal including a power supply terminal protruding from one surface. Wave integrated circuit,
The microwave integrated circuit is mounted on one surface, and one of the wide surfaces of the waveguide is formed on a part of the other surface, and the microwave signal terminal, the intermediate frequency signal terminal and the low frequency signal terminal are provided on the one surface. From the metal flat plate that penetrates to the other surface, one surface is joined to the other surface of the metal flat plate, and the intermediate frequency signal terminal and the low frequency signal terminal are penetrated from the one surface to the other surface and A metal block in which the other three surfaces of the waveguide including the microwave signal terminal are formed by recesses, and an intermediate frequency signal circuit, a low frequency signal circuit and a power supply circuit mounted on the other surface of the metal block are mounted. And a printed circuit board connecting the intermediate frequency signal terminal and the low frequency signal terminal to the circuits, the printed circuit board being the metal flat plate and the metal block. And a metal shield cover for shielding the printed circuit board over the well.

In the microwave waveguide device, the metal flat plate and the metal block perform signal isolation between the microwave signal terminal, the intermediate frequency signal terminal, and the low frequency signal terminal which penetrate the metal flat plate and the metal block. It can have a structure.

[0010]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a microwave waveguide device according to an embodiment of the present invention.

A microwave integrated circuit (MIC) 1 used in this microwave waveguide device is the same as the microwave integrated circuit 1 shown in FIG. 2, and has a microwave signal terminal 1a.
The intermediate frequency signal terminal 1b and the low frequency signal terminal 1c including the power supply terminal are projected from one surface (lower side in the figure).
The metal flat plate 6 has the microwave integrated circuit 1 mounted on one surface (upper part of the drawing) by screws, and the microwave signal terminal 1a, the intermediate frequency signal terminal 1b, and the low frequency signal terminal 1c from the one surface to the other surface. (Downward in the figure).
The metal flat plate 6 also forms one of the wide surfaces of the waveguide 2 on a part of the other surface. One surface of the metal block 7 (the surface facing upward in the figure) is joined to the other surface of the metal flat plate 6 by soldering or screwing. The intermediate frequency signal terminal 1b and the low frequency signal terminal 1c of the microwave integrated circuit 1 penetrate from one surface of the metal block 7 to the other surface (the surface facing downward in the drawing). Further, one surface of the metal block 7 has a recess with respect to the other surface of the metal flat plate 6, and the recess forms the other three surfaces of the waveguide 2 except the wide surface. The tip of the microwave signal terminal 1a is inserted into the inner surface of the waveguide 2 and operates as an antenna.

The printed circuit board 3 is mounted on the other surface of the metal block 7 by screwing. Printed circuit board 3
An electric component 5 that forms an intermediate frequency signal circuit, a low frequency signal circuit, and a power supply circuit is mounted on the board, and these electric parts 5 are connected to each other by a conductor (not shown). Further, the intermediate frequency signal terminal 1b and the low frequency signal terminal 1c are inserted into the printed circuit board 3 and these terminals are directly connected to the signal circuits. The printed circuit board 3 forming the signal circuits is a metal flat plate 6 and a metal block 7.
And a metallic shield cover 4 screwed to itself. The shield cover 4 covers the printed board 3 together with the metal flat plate 6 and the metal block 7 to shield the printed board 3.

As described above, in the microwave waveguide device of the present embodiment, the microwave circuit and the low-frequency signal circuit are structurally integrally formed, so that the device can be miniaturized and The cost can be reduced by saving the mechanical parts for the shield circuit and the waveguide circuit.

Here, the metal flat plate 6 and the metal block 7 signal-isolate the microwave signal terminal 1a, the intermediate frequency signal terminal 1b, and the low frequency signal terminal 1c which are penetrated by these metal bodies. . Also,
The intermediate frequency signal terminal 1b forms the center conductor of the coaxial line. With the configuration as described above, this microwave waveguide device can reduce mutual signal interference between the microwave signal, the intermediate frequency signal, and the low frequency signal, so that the microwave circuit and the low frequency signal circuit are structured. The characteristic is that there is no risk of deterioration in characteristics even if the device is formed integrally to reduce the size of the device.

[0015]

As described above, according to the present invention, a printed circuit board having an intermediate frequency signal circuit, a low frequency signal circuit and a power supply circuit mounted on the other surface of a metal block on which a microwave integrated circuit is mounted via a metal plate. Since the microwave circuit including the microwave integrated circuit and the low frequency signal circuit mounted on the printed circuit board are structurally integrated to reduce the size of the device and reduce the number of parts required for integration. There is an effect that the price can be reduced by the reduction.

Further, according to the present invention, the metal flat plate and the metal block signal-isolate the microwave signal terminal, the intermediate frequency signal terminal and the low frequency signal terminal which penetrate the metal flat plate and the metal block from each other. As a result, there is an effect of reducing the risk of characteristic deterioration due to signal interference that may occur due to the above integration.

[Brief description of drawings]

FIG. 1 is a sectional view of a microwave waveguide device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a microwave waveguide device according to the related art.

[Explanation of symbols]

 1 Microwave Integrated Circuit 1a Microwave Signal Terminal 1b Intermediate Frequency Signal Terminal 1c Low Frequency Signal Terminal 2 Waveguide 3 Printed Circuit Board 4 Shield Cover 5 Electrical Component 6 Metal Flat Plate 7 Metal Block

Claims (2)

[Claims] 1. A microwave integrated circuit which is hermetically sealed and has a microwave signal terminal, an intermediate frequency signal terminal, and a low frequency signal terminal including a power supply terminal protruding from one surface,
The microwave integrated circuit is mounted on one surface, and one of the wide surfaces of the waveguide is formed on a part of the other surface, and the microwave signal terminal, the intermediate frequency signal terminal and the low frequency signal terminal are provided on the one surface. From the metal flat plate that penetrates to the other surface, one surface is joined to the other surface of the metal flat plate, and the intermediate frequency signal terminal and the low frequency signal terminal are penetrated from the one surface to the other surface and A metal block in which the other three surfaces of the waveguide including the microwave signal terminal are formed by recesses, and an intermediate frequency signal circuit, a low frequency signal circuit and a power supply circuit mounted on the other surface of the metal block are mounted. And a printed circuit board connecting the intermediate frequency signal terminal and the low frequency signal terminal to the circuits, the printed circuit board being the metal flat plate and the metal block. Microwave waveguide apparatus characterized by covering also comprises a metal shield cover for shielding the printed circuit board. 2. The metal flat plate and the metal block are
2. The microwave waveguide device according to claim 1, wherein the microwave signal terminal, the intermediate frequency signal terminal, and the low frequency signal terminal penetrating therethrough are isolated from each other.