JP2001284839A - High frequency device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency device capable of reducing the weight, simplifying the manufacturing, and reducing the costs. SOLUTION: In this high frequency device to be used in a high frequency band, a case body is constituted of an inside part 23 and an outside part 22, and the inside part is constituted of a conductor, and the outside part is constituted of materials whose relative density is smaller than that of the inner side part so that the case body can be made light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-frequency device used in a high-frequency band.

[0002]

2. Description of the Related Art With the development of information technology in recent years, high-frequency devices such as directional couplers, power dividers, and filters have been used in various fields.

FIG. 4 shows an example of a conventional high-frequency device.
5 shows a directional coupler. Directional coupler 1
Is arranged so as to face the housing 2, the first dielectric substrate 3 and the second dielectric substrate 4 provided in the housing 2, the lid 5 of the housing 2, and the end surface of the housing 2. And a pair of first coaxial connecting portions 6 and 7 connected to each other, and second coaxial connecting portions 8 and 9 connected in parallel to one side surface of the housing 2 to form a triplate structure. ing.

The housing 2 is made of metal and has a rectangular parallelepiped recess 10.
Is formed, and has a thickness capable of supporting the first and second coaxial connection portions 6, 7, 8, 9 and is usually manufactured by cutting or die casting. A main line 11 and a sub line 12 made of copper foil are provided on the upper surface of the first dielectric substrate 3, and the main line 11 is connected to the first coaxial connection portions 6, 7.
And the sub-line 12 is connected to the second coaxial connection portions 8 and 9.
It is formed so as to connect between them. The lid 5 is made of metal, has a shape in which a convex portion 13 is formed on a thin plate, and is usually manufactured by cutting. The protrusion 13 can be fitted into the recess 10, and the protrusion length of the protrusion 13 is adjusted so that the protrusion 13 comes into contact with the second dielectric substrate 4 in a state fitted into the recess 10. Have been.

To assemble the directional coupler 1, the first coaxial connection portions 6 and 7 and the second coaxial connection portions 8 and 9 are connected to the housing 2, respectively, and the main line 11 and the sub line The first dielectric substrate 3 is placed flat in the concave portion 10 with the 12 facing upward, and the second dielectric substrate 4 is
It polymerizes on the dielectric substrate 3. Thereafter, the convex portion 13 is fitted into the concave portion 10 and the required number of the lids 5 (8 in FIG. 5).
It is joined to the housing 2 by screws 14 of the present embodiment. The protrusion 13 abuts on the second dielectric substrate 4, and the first dielectric substrate 3 and the second dielectric substrate 4 are sandwiched between the housing 2 and the lid 5.

[0006]

However, in the above-mentioned conventional high-frequency device, the housing must be made of metal in order to secure the grounding and shielding performance, and the housing must be made so as to support the coaxial connection. It was necessary to ensure sufficient body thickness. Therefore, there is a problem that it is difficult to reduce the weight of the housing.

Further, since the casing and the lid are manufactured by cutting or die-casting, the manufacturing is troublesome, and it has been difficult to reduce the manufacturing cost.

Further, in the case of the directional coupler, in order to fulfill its original function, the convex portion of the lid is brought into contact with the second dielectric substrate with the lid attached to the housing, and the lid is connected to the second dielectric substrate. The lid has to be closely attached to the housing so that no gap is formed between the housings. For this reason, processing of the housing and the lid needs to be performed with extremely high precision, which is very troublesome.

Further, there is a problem that it is difficult to reduce the defective rate of the product and to improve the grounding and shielding performance due to the difficulty in processing the casing and the lid as described above.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a high-frequency device capable of reducing the weight, simplifying the production, and reducing the cost.

[0011]

The present invention relates to a high-frequency device used in a high-frequency band, wherein a housing comprises an inner portion and an outer portion, the inner portion is a conductor, and the outer portion is the inner portion. It is characterized by being made of a material having a smaller specific gravity than the portion.

In a preferred embodiment, the outer casing made of resin, the inner casing made of metal fittable to the outer casing, a circuit element provided in the inner casing, and the inner casing are provided. A metal lid capable of sealing the body is provided, and the circuit element is configured to be shielded by the inner housing and the lid.

[0013] Preferably, a metal connecting portion connected to the circuit element is supported by the outer casing, and the connecting portion is formed so as to be able to contact the inner casing. Is made of a plate material that can be manufactured by pressing,
Further, the lid is provided in two layers, an air layer is formed between the lids, and the outer surfaces of the outer casing and the lid are plated.

In such a configuration, an inner housing is fitted to the outer housing in a state where the connection portion is fixed, a circuit element is disposed in the inner housing, and a lid is attached to the inner housing. Join airtight.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a directional coupler which is one of high-frequency devices. The directional coupler 21 includes an outer housing 22 and an inner housing 2 that can be fitted to the outer housing 22.
3 and a first dielectric substrate 2 provided in the inner casing 23.
4, the second dielectric substrate 25 and the inner lid 26, the outer lid 27,
A pair of first coaxial connection portions 28 and 29 and second coaxial connection portions 30 and 31 connected to the outer casing 22 are provided to form a triplate structure.

The outer casing 22 is made of a material having a specific gravity smaller than that of the inner casing 23, for example, a synthetic resin, has a box shape with an open upper part, and has the first coaxial connecting portions 28,2.
9 and the second coaxial connecting portions 30 and 31 are thick enough to be supported. Since the outer casing 22 is lightweight, the weight of the directional coupler 21 itself can be reduced. Also,
A first outer hole 32 is provided at each end of the outer casing 22,
The first outer holes 32 and 33 are opposed to each other. In addition, second outer holes 34 and 35 are formed at both ends of one side surface of the outer casing 22, respectively. The outer casing 22 is provided with the first and second outer holes 32,
Only the attachment portions 33, 34, and 35 may be made of metal, and the first and second coaxial connection portions 28, 29, 30, and 31 may be structured to increase the attachment strength.

The inner casing 23 is made of a conductive metal,
A fitting portion 36 capable of fitting to the outer casing 22 and the fitting portion 3
6 and an outer flange 37 formed at the upper end. Preferably, the inner casing 23 is manufactured by pressing a metal plate. Therefore, the manufacture of the inner housing 23 is easy, and the manufacturing cost can be reduced. The fitting portion 36 has the first outer holes 32 and 3.
3, first inner holes 38 and 39 are formed, and second inner holes 4 corresponding to the second outer holes 34 and 35, respectively.
0, 41 are drilled.

On the upper surface of the first dielectric substrate 24, a main line 42 and a sub line 43 made of copper foil are formed.
Forms a straight line, connects the first coaxial connecting portions 28 and 29, the sub-line 43 is formed in a U-shape, and the second
The coaxial connection parts 30 and 31 are connected.
The inner lid 26 and the outer lid 27 are both made of metal and have a thin plate shape, the inner lid 26 has a planar shape capable of being fitted into the fitting portion 36, and the outer lid 27 has the outer flange portion. 37 has a planar shape that can be polymerized. Therefore, the inner lid 26
Since it is not necessary to perform a complicated cutting process or die casting when manufacturing the outer lid 27 and the manufacturing is easy,
Manufacturing costs can be reduced.

The procedure for assembling the directional coupler 21 will be described with reference to FIG.

The fitting portion 36 of the inner casing 23 is fitted to the outer casing 22, and the first dielectric substrate 24 is placed in the posture in which the main line 42 and the sub-line 43 face upward.
Place flat inside. The first coaxial connecting portions 28 and 29 are airtightly connected to the first outer holes 32 and 33 and the first inner holes 38 and 39, respectively, and the second coaxial connecting portions 30 and 31 are respectively connected to the second outer holes 34. , 35 and the second inner holes 40, 41 in an airtight manner. Since the outer casing 22 has a sufficient thickness and strength, the first coaxial connecting parts 28 and 29 and the second coaxial connecting parts 30 and 31 are firmly supported by the outer casing 22 and The first coaxial connection portions 28 and 29 and the second coaxial connection portions 30 and 31 are in contact with the inner housing 23. Therefore, it is possible to take the ground of the inner casing 23 and the like via the first coaxial connection portions 28 and 29 and the second coaxial connection portions 30 and 31.

Thereafter, the second dielectric substrate 25 is superimposed on the first dielectric substrate 24, and the inner lid 26 is fitted in the inner casing 23 in a horizontal posture.
The inner lid 26 is polymerized on the upper surface 5. The inner lid 26 is fixed to the bottom surface of the inner housing 23 by a required number of screws (not shown), and the first dielectric substrate 24 and the second dielectric substrate 2 are fixed.
5 has a tri-plate structure by being sandwiched between the inner lid 26 and the bottom surface of the inner casing 23.

Further, when the outer lid 27 is superimposed on the outer flange portion 37 and is air-tightly joined to the outer flange portion 37 and the outer housing 22 by a required number (eight in FIG. 2) of screws 44, The first dielectric substrate 24 and the second dielectric substrate 25 are further shielded by the outer lid 27.
Therefore, the first dielectric substrate 24 and the second dielectric substrate 25 are doubly shielded by the inner lid 26 and the outer lid 27, so that the shielding performance is significantly improved. Also,
Since the inner lid 26 and the outer lid 27 are both thin plate-shaped, and the air layer 45 is formed between them, the weight can be reduced accordingly.

Although the directional coupler has been described in the above embodiment, the present invention provides a lightning arrester, an attenuator,
Other high frequency devices, such as power dividers and filters, can be implemented.

Further, the second dielectric substrate 25 and the inner lid 26 may be integrated. In this case, the number of parts is reduced, and the assembling work can be further simplified.

Further, the outer casing 22 and the outer lid 27
May be subjected to plating treatment such as resin plating, and in this case, more excellent shielding properties can be obtained.

[0027]

According to the present invention described above, the casing is composed of an inner part and an outer part, and the outer casing is made of a material having a lower specific gravity than the inner casing, so that the weight of the casing is reduced. be able to.

Further, since the inner housing, the lid and the connecting portion are each made of metal, the lid seals the inner housing, and the connecting portion can come into contact with the inner housing. Shield performance can be improved.

Further, when the inner casing is made of a press-processable plate material, it is not necessary to perform laborious cutting and die casting, so that the production is simplified and the production cost can be reduced. Become.

Further, when the lids are provided in two layers and an air layer is formed between the lids, various excellent effects such as further reduction in weight and further improvement in shielding performance can be achieved. Is obtained.

[Brief description of the drawings]

FIG. 1 is a side view and a partial sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view and a partial cross-sectional view illustrating an embodiment of the present invention.

FIG. 3 is an exploded perspective view showing the embodiment of the present invention.

FIG. 4 is a side view and a partial cross-sectional view showing a conventional example.

FIG. 5 is a plan view and a partial cross-sectional view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 22 outer housing 23 inner housing 24 first dielectric substrate 25 second dielectric substrate 27 outer lid 28 first coaxial connection unit 29 first coaxial connection unit 30 second coaxial connection unit 31 second coaxial connection unit

Claims (6)

[Claims] 1. A high-frequency device used in a high-frequency band, wherein a housing includes an inner portion and an outer portion, the inner portion is a conductor, and the outer portion is made of a material having a lower specific gravity than the inner portion. A high-frequency device, comprising: 2. The outer casing made of resin, the inner casing made of metal fittable to the outer casing, a circuit element provided in the inner casing, and the inner casing can be hermetically sealed. The high-frequency device according to claim 1, further comprising: a metal cover, wherein the circuit element is configured to be shielded by the inner housing and the cover. 3. The high-frequency device according to claim 2, wherein a metal connecting portion connected to the circuit element is supported by the outer housing, and the connecting portion is formed so as to be able to contact the inner housing. . 4. The high-frequency device according to claim 1, wherein the inner housing is made of a plate material that can be manufactured by press working. 5. The high-frequency device according to claim 2, wherein said lids are provided in two layers, and an air layer is formed between said lids. 6. The high-frequency device according to claim 1, wherein the outer surfaces of the outer casing and the lid are plated.