JP2524057Y2 - Microstrip circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a microstrip circuit, and more particularly to a microstrip circuit having a triplate structure.

[Prior Art] Generally, a microstrip circuit having a triplate structure is often used for a microwave circuit because of its low loss and miniaturization.

FIG. 2A shows an external perspective view of an example of a conventional microstrip circuit having a triplate structure, and FIG. 2B shows a cross-sectional view thereof. In FIG. 2 (b), the printed circuit board 3 on which the microstrip line 4 is formed is held by dielectrics 2a and 2b and further sandwiched by ground conductor plates 11a and 11b. The short-circuit boards 5a and 5b are printed circuit boards 3
The ground conductor plates 11a and 11b are electrically short-circuited and are fixed by bolts 6. As shown in FIG. 3, in order to reduce the weight, the ground conductor plates 11a, 11b and the short-circuit plates 5a, 5b are connected to the conductive adhesives 8c, 8d, 8e, 8f.
Some are fixed at.

Further, in the case of a multi-layer structure, as shown in FIG. 4, as in the microstrip circuit of FIG. 2, a plurality of short circuit plates 5a to 5h inserted between ground conductor plates 11a to 11f of each layer are provided. They are stacked and fixed with bolts 6a, 6b and nuts 7a, 7b.

In these microplate circuits having the triplate structure, the occurrence of unnecessary modes of electromagnetic waves in the circuit is prevented by short-circuiting the ground conductor plates.

[Problems to be solved by the invention]

Since the conventional microstrip circuit of the above-mentioned triplate structure has a structure in which the ground conductor plate and the short-circuit plate are fixed with screws, it is extremely difficult to reduce the weight in the case of a multiplate triplate structure. There was a disadvantage that it would. In addition, when the ground conductor plate and the short-circuit plate are used by bonding with a conductive adhesive, two types of dielectric adhesive are used to bond the dielectric constituting the circuit and the printed circuit board in order to integrally mold. Must be cured simultaneously, and it is difficult to select an adhesive. Further, if the simultaneous curing is insufficient, there is a problem that the ground conductor plate is distorted and the impedance characteristic of the line is deteriorated.

The present invention is to provide a microstrip circuit which can reduce the weight of an integrally formed multilayer structure without these conventional disadvantages.

[Means for solving the problem]

The microstrip circuit of the present application includes two ground conductor plates that sandwich a printed circuit board on which a microstrip line is formed via a dielectric, and extends the ends of the two ground conductor plates to the outer edge of the dielectric. Said and extended 2
At least one of the ends of the ground conductor plates is bent to bring the ends into short-circuit contact with each other to form a triplate structure surrounding the printed circuit board, and a plurality of the triplate structures are stacked to form a multilayer structure.

〔Example〕

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

 FIG. 1 is a sectional view of an embodiment of the present invention.

First, in the first layer, the microstrip line
The printed circuit board 3a forming 4a is sandwiched between dielectrics 2a and 2b, and a microstrip circuit is formed by the ground conductor plate 1a and the ground conductor plate 1b. The ground conductor plate 1a and the ground conductor plate 1b have their ends extended to short-circuit each other.
Is further bent, and is contacted with the end of the ground conductor plate 1a, which is at the bottom and is not bent, and is fixed with the conductive adhesives 8a and 8b.

Also in the second layer, the printed circuit board 3b is connected to the dielectrics 2c and 2d.
The end of the ground conductor plate 1c is bent so as to make contact with the side surface of the ground conductor plate 1b so as to make a short circuit, and the front end portion is fixed with conductive adhesives 8a and 8b.

Similarly, in the third layer, the printed circuit board 3c is
It has a structure in which the end of the ground conductor plate 1d is bent and short-circuited on the ground conductor plate 1c.

In this embodiment having such a structure, each of the first, second and third layers has a triplate structure, and the conductor plates at various places are short-circuited. Mode is prevented from occurring. By extending and bending the ground conductor plate and using it as a short-circuit plate in this way, the structure becomes lighter than the conventional case where a short-circuit plate is inserted and bolted, and the characteristics do not deteriorate.

Although the present embodiment has a three-layer structure of three circuits, other layers may be used.

[Effect of the invention]

As described above, the present invention extends the ground conductor plate of the triplate circuit, and bends the ends other than the lowermost portion to be used together as a short-circuit plate, thereby preventing unnecessary modes of electromagnetic waves in the circuit, There is an effect that the multilayer structure is easy and the weight can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG.
3 (b) and FIGS. 3 (a) and 3 (b) are a perspective view, a cross-sectional view, and a
FIG. 1 is a sectional view of a multilayer structure of a conventional microstrip circuit. 1a, 1b, 1c, 1d, 11a, 11b, 11c, 11d, 11e, 11f ... ground conductor plate, 2
a, 2b, 2c, 2d, 2e, 2f ... dielectric, 3, 3a, 3b, 3c printed circuit board, 4, 4a, 4b, 4c microstrip line, 5a, 5
b, 5c, 5d, 5e, 5f, 5g, 5h …… Short circuit board, 6,6a, 6b …… Bolt,
7a, 7b: Nut, 8a, 8b, 8c, 8d, 8e, 8f: Conductive adhesive.

Claims (1)

(57) [Scope of request for utility model registration] 1. A printed circuit board on which a microstrip line is formed is provided with two ground conductor plates sandwiching a dielectric material therebetween, and the ends of the two ground conductor plates are extended to the outer edge of the dielectric material. At least one of the ends of the two extended ground conductor plates is bent to form a triplate structure surrounding the printed circuit board by short-circuiting the ends with each other. A microstrip circuit comprising: