JP2001136008A - Microwave waveguide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a microwave waveguide device that the cost can be reduced by simplifying the structure so as to decrease number of components and a metallic cover maintains an electromagnetic shield for a waveguide section and a printed circuit board. SOLUTION: A microwave integrated circuit 1, from one side of which a microwave signal terminal 1a, an intermediate frequency signal terminal 1b and a low frequency signal terminal 1c including a power terminal are projected, is mounted on one side of a metallic plate 6. The printed circuit board 3 is closely adhered/connected to the other side of the metallic plate 6. The other side of the metallic plate 6 and supports 41-46 of a metallic cover 4 clamp the printed circuit board 4. Electric circuits 5 such as an intermediate frequency signal circuit, a low frequency signal circuit and a power supply circuit are mounted on the printed circuit board 4 and the printed circuit board 3 partitioned by the supports 41, 44, 45 and the metallic cover 4 configure a waveguide circuit. The metallic cover 4 maintains the electromagnetic shield for the electric circuit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a microwave waveguide device including a microwave integrated circuit (MIC), 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 a structural diagram of FIG. (A) is a transverse sectional view, (b) is a longitudinal sectional view. The illustrated microwave integrated circuit 1 has a microwave signal terminal 1a and a low frequency signal terminal including an intermediate frequency signal terminal 1b and a power supply terminal 1c protruding from one side. These terminals 1 a to 1 c are connected to the microwave integrated circuit 1 and other microwave circuits and electric circuits 5.
It becomes an electrical connection with D. One surface of the microwave integrated circuit 1 is attached to (mounted on) one surface of the metal plate 6.
The terminals 1 a to 1 c penetrate the metal plate 6 and protrude.

The other surface of the metal plate 6 is divided into a portion forming the waveguide 2E together with the metal cover 9B, and a portion which is in close contact with one surface of the printed board 3D and is electrically connected. The terminal 1a of the microwave integrated circuit 1 is inserted inside the waveguide 2E to form a coaxial-waveguide converter. The terminals 1b and 1c protrude through the printed circuit board 3D, and generally include a plurality of circuit components 5a mounted on the other surface of the printed circuit board 3D.
To form an electric circuit 5D such as an intermediate frequency signal circuit and a power supply circuit. The electric circuit 5D includes a metal cover 9A.
And is electromagnetically shielded from other circuits together with the metal plate 6 (or the entire conductor layer formed on one surface of the printed circuit board 3D).

A microwave waveguide device having substantially the same configuration as that of FIG. 6 is disclosed in Japanese Patent Application Laid-Open No. 9-83202.

[0005]

The conventional microwave waveguide device described above has a three-point structure consisting of a metal plate and a metal cover, and is structurally complicated, so that the cost of parts is increased and the number of assembling steps is reduced. There was a disadvantage that it became larger.

Further, in this microwave waveguide device, even if the metal cover (9A) covering the printed circuit board (3D) and the metal cover (9B) forming the waveguide (2D) are to be used as a common metal cover, Due to the variation in the thickness of the printed circuit board (3D), there is a gap between the metal plate (6) and the metal cover (9B) or a gap between the printed board (3D) and the metal cover (9A). There is a disadvantage that the electromagnetic shield of the circuit becomes incomplete.

Accordingly, an object of the present invention is to eliminate the above-mentioned disadvantages, reduce the number of parts by simplifying the structure, reduce the cost, and reduce the electromagnetic wave of the waveguide circuit and the electric circuit on the printed circuit board. An object of the present invention is to provide a microwave waveguide device capable of securing a shield.

[0008]

SUMMARY OF THE INVENTION A microwave waveguide device according to the present invention includes a microwave integrated circuit for projecting a microwave signal terminal and a low frequency signal terminal including an intermediate frequency signal terminal and a power supply terminal from one surface, A metal plate on which the microwave integrated circuit is mounted and on which the microwave signal terminal and the low-frequency signal terminal are penetrated on the other surface, one surface of which is in close contact with the other surface of the metal plate and the microwave signal terminal and A first printed circuit board that is conductively connected except for a penetrating portion of the low-frequency signal terminal, and a metal cover that sandwiches the first printed circuit board between the metal plate at a predetermined interval by a plurality of supports. A portion of the other surface of the first printed circuit board, through which only the microwave signal terminal of the microwave integrated circuit passes, is a predetermined support of the metal cover. It constitutes a waveguide between the other surface of the first printed circuit board except for the configuration of the waveguide, characterized in that for mounting the electrical circuit connected to said low-frequency signal terminal.

[0009] The first of the microwave waveguide devices may have a configuration in which a constituent part of the waveguide on the other surface of the first printed circuit board includes a full-surface conductor layer.

[0010] A second aspect of the microwave waveguide device is that the metal plate forming the waveguide is mounted on an electric circuit near one side of the first printed circuit board. A configuration in which the shape is changed to have a space can be adopted.

A third aspect of the microwave waveguide device is that the waveguide has an E-bend formed in the metal cover such that an opening is perpendicular to the metal plate, the metal plate and the E-bend. A configuration having a conductive through-hole formed in one printed circuit board can be adopted.

A fourth aspect of the microwave waveguide device is that the waveguide has an H-bend formed in the metal cover such that an opening is in a direction perpendicular to the metal plate. Can be.

A fifth aspect of the microwave waveguide device is that the waveguide is formed in a direction perpendicular to the metal plate from a portion of the microwave signal terminal projecting from an opening. Can be.

In a sixth aspect of the microwave waveguide device, the waveguide has an E-bend and a through-hole formed in the metal cover so that an opening is perpendicular to the metal plate. be able to.

A seventh aspect of the microwave waveguide device may be configured such that connection between microwave signal terminals of the different microwave integrated circuits is performed through a common waveguide.

An eighth aspect of the microwave waveguide device is that at least one printed circuit board maintained at a predetermined distance by a plurality of metal supports between the other surface of the first printed circuit board and the metal cover. The first printed circuit board including the microwave signal terminal penetrating therethrough, the second printed circuit board facing the other surface, the entire surface of the second printed circuit board having a conductive layer, and the metal support. A configuration that constitutes a wave tube can be employed.

A ninth aspect of the microwave waveguide device is that the printed circuit board, excluding the components of the waveguide, is connected directly or indirectly to the low-frequency signal terminal and an electromagnetic shield is provided for other circuits. A configuration in which the electric circuit described above is mounted can be adopted.

[0018]

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

FIG. 1 is a structural view of a microwave waveguide device according to a first embodiment of the present invention, wherein FIG.
(B) is a longitudinal sectional view. The microwave integrated circuit 1 used in the microwave waveguide device shown in FIG. 1 is the same as the microwave integrated circuit 1 shown in FIG. 6, and includes a microwave signal terminal 1a, an intermediate frequency signal terminal 1b, and a power supply terminal. The low-frequency signal terminal 1c including the low-frequency signal terminal 1c protrudes from one surface (below the drawing). The metal plate 6 has one surface of the microwave integrated circuit 1 attached (mounted) on one surface (the upper side in the figure), and the microwave signal terminal 1a, the intermediate frequency signal terminal 1b, and the low frequency signal terminal 1c are connected from the one surface to the other surface. (Below the figure). One surface of the printed board 3 is in close contact with the entire other surface of the metal plate 6 and is conductively connected. However, the terminals 1 a to 1 c penetrate the printed board 3 and protrude from the other surface of the printed board 3. The portion of the printed circuit board 3 through which the terminals 1a to 1c penetrate may have a through-hole structure such that the terminals 1a to 1c do not contact. Further, metal plating is performed on the side surface of the printed circuit board 3 in the thickness direction. In the following description of the embodiments, in order to facilitate understanding of the features of the embodiments, descriptions of the above-described components and the like will be omitted except when necessary.

The printed circuit board 3 includes a metal plate 6 and a metal cover 4.
And fix it. At this time, since the waveguide 2 needs to be formed between one surface of the metal cover 4 and the other surface of the printed circuit board 3, the plurality of supports 41 to 41 are provided so that only the fundamental mode passes through the waveguide 2. The one surface of the metal cover 4 and the other surface of the printed board 3 are fixed by a predetermined distance by 46. The supports 41 to 46 are preferably formed integrally with the upper surface of the metal cover 4. The support 41 serves as a partition between the printed circuit board 3 and the waveguide 2 and the low frequency signal circuit (electric circuit 5). A portion of the printed circuit board 3 corresponding to the waveguide 2 may have the entire other surface as a conductor, or may have no conductor layer at all. In the waveguide 2 having no conductor layer, the portion of the printed circuit board 3 forms a dielectric layer.
Therefore, in both cases, it is necessary to change the distance between the printed board 3 and one surface of the metal cover 4 so that only the fundamental mode passes through the waveguide 2. When the other surface of the portion corresponding to the waveguide 2 of the printed circuit board 3 has no conductor layer,
It is necessary to eliminate metal plating on the side surface of the printed circuit board 3 in the opening 22 of the waveguide 2.

In the microwave waveguide device shown in FIG. 1, one surface of the metal cover 4 or the other surface of the printed circuit board 3 as the entire conductor layer and the portion of the metal plate 6 surrounded by the supports 41, 44 and 45 are conductive. The wave tube 2 is constituted. The opening 22 of the waveguide 2 is in a direction parallel to the metal plate 6 (to the left in FIG. 2B).
Is formed. The waveguide 2 and the microwave signal terminal 1a form a coaxial-waveguide circuit. For example, when the microwave integrated circuit 1 is an oscillator, a microwave signal is transmitted from the microwave signal terminal 1a to the waveguide. 2 or a microwave signal is input from the waveguide 2 to the microwave signal terminal 1a when the receiver is a receiver.

On the other hand, the electric circuit 5 such as the intermediate frequency signal circuit, the low frequency signal circuit and the power supply circuit
And the supports 41 to 46 of the metal cover 4
Is formed on the other surface of the printed circuit board 3 in a portion formed so as to surround the printed circuit board 3. The electric circuit 5 including the circuit components 5a and the like is connected to the terminals 1b and 1c of the microwave integrated circuit by metal wires and the like, and the microwave waveguide device of FIG. 1 forms an integrated electric circuit. The connection of the power supply and the low-frequency signal between the electric circuit 5 of this microwave waveguide device and other circuits is made through a through capacitor or a coaxial line (not shown) provided on the metal cover 4. Further, since the electric circuit 5 on the printed circuit board 3 is sandwiched between the metal cover 4 and the metal plate 6, it is electromagnetically shielded from other circuits.

FIG. 2 is a longitudinal sectional view of a microwave waveguide device according to a second embodiment of the present invention.

The microwave waveguide device shown in FIG. 2 has a configuration based on almost the same design concept as the microwave waveguide device shown in FIG. Therefore, the microwave integrated circuit 1,
The waveguide 2 and the metal cover 4 are the same as the microwave waveguide device of FIG. However, the microwave waveguide device shown in FIG. 2 requires a printed circuit board 3 of 3A in order to increase the size of an electric circuit that can be mounted on the printed circuit board.
In addition, the shape of the metal plate 6 is changed to 6A. That is, in this microwave waveguide device, the waveguide 2 is configured together with the printed board 3A so that the electric circuit 5A including the electric components and the mechanical components can be mounted on one surface of the printed board 3A forming the waveguide 2. The shape of the metal plate 6A is changed so as to have a rectangular parallelepiped space 62 in which the circuit component 5b for the electric circuit 5A can be mounted near the component of the waveguide 2.
That is, in addition to the circuit component 5a, the circuit component 5b is mounted in the space 62 defined by the metal plate 6A of the printed board 3A,
The scale of the electric circuit 5 in FIG. 1 is expanded to an electric circuit 5A. The printed circuit board 3A has the electric circuit 5A mounted on one surface near the waveguide 2 in addition to the electric circuit 5A formed on the other surface. It is desirable to provide a conductor layer. Circuit parts 5
The electric circuit 5A including the portion b also includes the space 62 of the metal plate 6A.
Are electromagnetically shielded from other circuits by the printed circuit board 3A and the portion forming the same.

FIG. 3 is a longitudinal sectional view of a microwave waveguide device according to a third embodiment of the present invention.

The microwave waveguide device shown in FIG. 3 also has a configuration based on almost the same design concept as the microwave waveguide device shown in FIG. However, in the microwave waveguide device of FIG. 3, the opening 22A of the waveguide 2A (2) is oriented in a direction perpendicular to the metal plate 6B (6) (upward in the figure), and the other waveguides are formed. The connection with the device is diversified. In this microwave waveguide device, an E-bend 21 (or an E-corner) may be provided in a portion of the metal cover 4A at the waveguide 2A, and guided to the printed board 3B and the metal plate 6B in the bending direction of the waveguide 2A. The waveguide is formed by penetrating a waveguide having the same size as the diameter of the waveguide 2A. Printed circuit board 3
A conductor layer must be provided on the waveguide wall portion of B.
The waveguide wall portion of the metal plate 6B has a conductor layer as a matter of course.

In the waveguide 2A, an H-bend (H corner) is formed on the metal cover 4A so that the opening 22A is at right angles to the metal plate 6 (6B) (forward or backward in the drawing). May be formed). in this case,
There is no need to provide a through hole for a waveguide in the printed board 3B and the metal plate 6B, and the printed board 3 and the metal plate 6 of FIG. 1 are used. Then, as shown in FIG. 2, an electric circuit can be mounted on one surface of the printed circuit board 3B (3).

Further, the opening 22A of the waveguide 2A is made to extend in a direction perpendicular to the metal plate 6B (forward or backward in the drawing) from the protruding portion of the microwave signal terminal 1a of the microwave integrated circuit 1. May be formed. Also in this case, it is not necessary to provide a through hole for a waveguide in the printed board 3B and the metal plate 6B, and the printed board 3 and the metal plate 6 of FIG. 1 are used. The metal cover 4A
Requires a separate support and a support for partitioning the electrical circuit 5 corresponding to the support 41 in order to constitute the waveguide. In this microwave waveguide device, it is of course possible to mount an electric circuit 5A including an electric component and a mechanical component on one surface of a printed circuit board 3B forming the waveguide 2 similar to FIG. is there.

As described above, the various types of microwave waveguide devices described with reference to FIG.
Since the direction of 2A is changed in various ways, there is an effect that the connecting method of a plurality of microwave integrated circuits and microwave waveguide devices is diversified.

FIG. 4 is a longitudinal sectional view of a microwave waveguide device according to a fourth embodiment of the present invention, with a part thereof not shown.

In the microwave waveguide device shown in FIG. 4, the above-mentioned microwave integrated circuit 1 and the microwave integrated circuit 11 having two microwave signal terminals 11a and 11e are connected via a commonly used waveguide 2B. Connected. The microwave integrated circuit 11 connected to the electric circuit 5B
The intermediate frequency signal terminal 1b and the low frequency signal terminal 1c are collectively shown as a low frequency signal terminal 11d. If the microwave integrated circuit 1 is a receiver, the microwave integrated circuit 11
Are often microwave low noise amplifiers. In this case, the microwave integrated circuit 11 receives the microwave signal input from the opening 22B of the waveguide 2C formed by the metal plate 6C or the like at the microwave signal terminal 11e, and converts the amplified microwave signal into the microwave. Output from the signal terminal 11a. This microwave signal is input from the microwave signal terminal 1a to the microwave integrated circuit 1 as a receiver via the waveguide 2B shared by the microwave integrated circuit 1 and the microwave integrated circuit 11.

When the microwave integrated circuit 1 is an oscillator and the microwave integrated circuit 11 is a modulation transmitter, the microwave signal output from the microwave signal terminal 1a is integrated by the microwave integrated circuit 2B via the shared waveguide 2B. The signal is input to the microwave signal terminal 11a of the circuit 11. The microwave signal modulated and amplified by the microwave integrated circuit 11 is supplied to an antenna or the like via the microwave signal terminal 11e and the opening 22B.

Here, the microwave integrated circuit 1 and the microwave integrated circuit 11 are, as shown in FIG.
As in the case where only one is mounted, it is only necessary to increase the area of each of the metal plates 6C, the printed circuit board 3C, the metal covers 4B to which the support members 47, 48, etc. are added one by one. Although FIG. 4 shows a case where only two microwave integrated circuits are used, the metal plate 6 may be used even when a large number of microwave integrated circuits are used, such as when a large number of amplifiers are cascaded.
C, the printed circuit board 3C and the metal cover 4B need only be provided one by one. When the scale of the electric circuit 5B is increased, the metal plate 6C may be changed to the same shape as that of FIG. Furthermore, this cascade connection configuration can also be applied to the microwave waveguide device in which the opening of the waveguide 2A described with reference to FIG. 3 is perpendicular to the metal plate 6B.

FIG. 5 is a structural view of a microwave waveguide device according to a fifth embodiment of the present invention, wherein FIG.
(B) is a longitudinal sectional view.

The basic structure of the microwave waveguide device shown in FIG. 5 is the same as that of the microwave waveguide device shown in FIG. 1, but the printed circuit board 3 and the A printed circuit board 7 is added between the printed circuit board 7 and the metal cover 4. The support 41 of the metal cover 4 is provided between the printed board 3 and the printed board 7 which are in close contact with the metal plate 6.
The same shape as the supports 41 to 46 at the positions
Metal blocks 81 to 86 having dimensions are provided. When the conductor layer is formed on the other surface of the printed circuit board 3 and the entire surface of the printed circuit board 7,
One surface of the printed circuit board 7, metal blocks 81, 84 and 8
The portion surrounded by 5 constitutes the waveguide 2C. The waveguide 2D is electrically connected to the microwave signal terminal 1a. In the metal blocks 81 to 86, it is necessary to set the distance between the other surface of the printed circuit board 3 and the one surface of the printed circuit board 7 opposite to the above-mentioned predetermined dimension so as to prevent transmission of higher-order modes to the waveguide 2D. Similarly, when a conductor layer is not formed on the other surface of the printed circuit board 3, transmission of higher-order modes to the waveguide 2D is prevented.

The electric circuit 5C is mounted on both sides of the printed circuit board 7 in addition to the circuits (represented by the circuit components 5a) on the other side of the printed circuit board 3 except for the waveguide 2 (2D in this figure) in FIG. (Represented by circuit components 5c to 5e).
The electric circuit 5C on the other surface of the printed circuit board 7 separated by the support 41 is connected by a feedthrough capacitor, a coaxial line, or the like (not shown) provided on the support 41. The electric circuit 5C on the printed circuit boards 3 and 7 is electromagnetically shielded from external circuits by the metal plate 6, the metal cover 7, and the metal block 82.

The microwave waveguide device shown in FIG. 5 has a multilayer printed circuit board similar to the printed circuit board 7 and a plurality of metal blocks similar to the metal blocks 81 to 86 for keeping a predetermined distance between the printed boards. It is possible to increase the scale of the electric circuit 5C while keeping the constant, and the effect of miniaturization is improved. When the printed board 7 is a multilayer board, the number of printed boards can be reduced.

[0038]

As described above, the present invention relates to a microwave integrated circuit for projecting a microwave signal terminal and a low frequency signal terminal including an intermediate frequency signal terminal and a power supply terminal from one side, and the microwave integrated circuit on one side. A metal plate on which a circuit is mounted and the microwave signal terminal and the low-frequency signal terminal are penetrated on the other surface, and one surface of which is in close contact with the other surface of the metal plate and the microwave signal terminal and the low-frequency signal terminal A first printed circuit board that is conductively connected except for a penetrating portion, and a metal cover that sandwiches the first printed circuit board between the metal plate at a predetermined interval by a plurality of supports; A portion of the other surface of the first printed circuit board, through which only a microwave signal terminal of the integrated circuit passes, constitutes a waveguide between the metal cover and a predetermined support of the metal cover. The first except for the structure of the waveguide
Since the other surface of the printed circuit board mounts the electric circuit connected to the low-frequency signal terminal, not only the cost can be reduced by reducing the number of components due to the simplification of the structure, but also the waveguide section and the printed circuit board mounting. The effect of holding the electromagnetic shield for the electric circuit is great.

[Brief description of the drawings]

1A and 1B are structural views of a microwave waveguide device according to a first embodiment of the present invention, wherein FIG. 1A is a cross-sectional view and FIG.

FIG. 2 is a longitudinal sectional view of a microwave waveguide device according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a microwave waveguide device according to a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a microwave waveguide device according to a fourth embodiment of the present invention, with a part thereof not shown.

5A and 5B are structural views of a microwave waveguide device according to a fifth embodiment of the present invention, wherein FIG. 5A is a cross-sectional view and FIG.

6A and 6B are structural views of a microwave waveguide device according to a conventional technique, wherein FIG. 6A is a transverse sectional view and FIG. 6B is a longitudinal sectional view.

[Explanation of symbols]

 1,11 Microwave integrated circuit (MIC) 1a, 11a, 11e Microwave signal terminal 1b Intermediate frequency signal terminal 1c, 11d Low frequency signal terminal 2,2A ~ 2D Waveguide 22,22A, 22B Opening 3,3A ~ 3C, 7 Printed circuit board 4,4A, 4B Metal cover 41-46 Support 5,5A-5C Electric circuit 5a-5e Circuit component 6,6A-6C Metal plate 81-86 Metal block

Claims (10)

[Claims] 1. A microwave integrated circuit for projecting a microwave signal terminal and a low frequency signal terminal including an intermediate frequency signal terminal and a power supply terminal from one surface, and the microwave integrated circuit mounted on one surface and the microwave integrated circuit mounted on the other surface. A metal plate that penetrates the microwave signal terminal and the low-frequency signal terminal is electrically connected to one side of the metal plate except for a penetrating portion of the microwave signal terminal and the low-frequency signal terminal. A first printed circuit board, and a metal cover that sandwiches the first printed circuit board between the metal plate at a predetermined interval by a plurality of supports, wherein only a microwave signal terminal of the microwave integrated circuit is provided. A portion of the other surface of the first printed circuit board to be penetrated forms a waveguide between the metal cover and a predetermined support of the metal cover, and before a component of the waveguide is removed. Other surfaces of the first printed circuit board, said microwave waveguide and wherein the mounting the electrical circuit connected to the low-frequency signal terminal. 2. The microwave waveguide device according to claim 1, wherein the component part of the waveguide on the other surface of the first printed circuit board includes a full-surface conductor layer. 3. The shape of the metal plate constituting the waveguide is changed so as to have a space for mounting an electric circuit on one surface of the first printed circuit board in the vicinity of the component of the waveguide. The microwave waveguide device according to claim 1 or 2, wherein: 4. An E-shaped waveguide formed in the metal cover such that an opening is perpendicular to the metal plate.
2. A bend and a conductive through hole formed in the metal plate and the first printed circuit board.
Or the microwave waveguide device according to claim 2. 5. An H-bend is formed in the metal cover so that the waveguide has an opening perpendicular to the metal plate. The microwave waveguide device according to claim 3. 6. The waveguide according to claim 1, wherein the waveguide is formed in a direction perpendicular to the metal plate from a portion of the microwave signal terminal protruding from an opening. The microwave waveguide device according to claim 3. 7. The metal cover according to claim 1, wherein the waveguide has an E-bend and a through hole formed in the metal cover so that an opening is perpendicular to the metal plate. Or the microwave waveguide device according to claim 3. 8. The connection between microwave signal terminals of the microwave integrated circuit, which are different from each other, is made through a common waveguide.
The microwave waveguide device according to any one of the above. 9. The microwave signal, wherein at least one printed circuit board is provided between the other surface of the first printed circuit board and the metal cover at a predetermined interval with a plurality of metal supports, and the microwave signal passes through the printed circuit board. The waveguide is constituted by the other surface of the first printed circuit board including the terminal, one surface of the second printed circuit board facing the other surface having the entire conductor layer, and the metal support. The microwave waveguide device according to claim 1, 2 or 3, wherein: 10. The printed circuit board, excluding a component part of the waveguide, is mounted with an electric circuit connected directly or indirectly to the low-frequency signal terminal and electromagnetically shielded from other circuits. The microwave waveguide device according to claim 1, characterized in that: