JPS62258503A - Nonreversible circuit element - Google Patents

Abstract

PURPOSE:To decrease the variation of the characteristic and to improve the mass-productivity by forming the center conductor of a nonreversible circuit element by a 3-layer or over of conductor film. CONSTITUTION:The 1st strip conductor 12A is formed by a conductor film formed by short-circuiting a two-parallel wire at both ends to the upper face of a multi-layer printed circuit board 10. The 2nd strip conductor 12B is formed by the conductor film formed by short-circuiting a 2-parallel wire at both ends in the intermediate layer of the board 10. The conductor 12B has an angle of 120 deg. to the conductor 12A. The 3rd strip conductor 12C is formed by the conductor film formed by short-circuiting the 2-parallel wire at both ends. The conductor 12C has an angle of 120 deg. to the conductor 12B. Thus, the variation of the characteristic is decreased and the mass-productivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to irreciprocal circuit elements such as lumped constant circulators and lumped constant physulators.

(Summary of the Invention) The present invention provides a method for assembling non-reciprocal circuit elements such as lumped constant circulators and lumped constant isolators by configuring the central conductor portion with three or more conductor films provided on an insulating substrate. This makes it easier and improves mass production.

(Prior art) There are waveguide type and coaxial type circulators and isolators that operate as non-reciprocal circuit elements in the microwave band, and there are two types of coaxial circulators and isolators: distributed constant type and lumped constant type. There is. Generally, distributed constant type circulators and isolators are used in the high frequency range even in the microwave band, and lumped constant type circulators and isolators are used in the low frequency range, respectively.

FIG. 3 shows a schematic configuration of a general lumped constant type circulator. In this figure, the lumped constant type circulator has a central conductor part 1, which is a combination of strip conductors, sandwiched between two ferrites 2, the outside of the ferrites 2 being wrapped in a shield case 3, and these are housed in a storage case.
Permanent magnets 5 are provided above and below the shield case 3 to apply a DC magnetic field to the ferrite 2. here,
The center conductor section 1 is a combination of three sets of strip conductors serving as junction inductors.

FIG. 14 shows an example of a conventional center conductor section. In this case, each strip conductor 6 is formed integrally with the shield case 3 that covers the ferrite 2 from a Jk metal plate, and each strip conductor 6 is bent and arranged so as to form an angle of 120° with respect to each other.

(Problem 7α to be solved by the invention) By the way, with the conventional structure of the center conductor part as shown in FIG. 4, it is difficult to maintain the angle of each strip conductor at 120°, and the bending angle of the strip conductor There was a problem that variations in characteristics tend to occur due to variations in the characteristics, and it takes time to assemble.

(Means for solving the problem of 7 generations of good luck) In view of the above points, the present invention provides the following features:
The present invention aims to provide a nonreciprocal circuit element that has constant characteristics, is easy to assemble, and is suitable for mass production.

In the present invention, when at least three or more strip conductors intersect with each other and the center conductor part is vItL, the at least three or more strip conductors are composed of at least three layers of conductive films provided on a printed wiring board. The above-mentioned problems have been solved by the above-mentioned means.

(Example) Hereinafter, an example of a non-reciprocal circuit element according to the present invention will be described with reference to the drawings.

1 and r:tS2 show the vt value of the central conductor portion of the irreversible circuit element. In these figures, on both sides of the multilayer printed circuit board [10] there are protrusions 11 parallel to each other.
A, IIB and protrusions 11C, 11D are integrally formed so as to protrude.

Then, on the upper surface of the multilayer printed wiring board 10, a first strip conductor 1 is formed with a conductor film in the form of two parallel lines short-circuited at both ends.
2A is formed, and the tip of the first strip conductor 12A is a through hole (the inner circumference is provided with a conductor film) 13.
PJ1 ground electrode 14A of the conductor film on the back side of the board via A
connected to.

Also, the rear end of the first conductor 12A extends above the protrusion 11A. ! The pole terminal is 15A.

The electrode terminal 15A is also formed with a conductive film on the back surface of the protruding piece 11A, and the electrode terminals on the front and back sides of the protruding piece 11A are formed through the through hole 16A.
are interconnected through.

In the middle layer of the multilayer printed wiring board 10, a second strip conductor 12 is formed of a conductor film having two parallel lines short-circuited at both ends.
B is formed. This second strip conductor 12B forms an angle of 120° with respect to the first strip conductor 12A, and is arranged perpendicularly to the edge of the board. The tip of the fjS2 string conductor 12B is connected to the ptS2 ground electrode 14B of the conductor film on the front and back surfaces of the substrate via the through hole 13B. Further, the rear end of the second strip conductor 12B is connected to the protruding piece 1 through the through hole 16B.
Electrode terminals 1 of conductor films formed on the front and back surfaces of 1B and 11C
Connected to 5B and 15C.

Further, on the back surface of the multilayer printed wiring board 10, a third strip conductor 12C is formed by a conductor-film having two parallel lines short-circuited at both ends. This third strip conductor 12C
is the second strip conductor 12B+, :Nu 120°
It forms an angle of .

The tip of the F53 strip conductor 12C is connected to the third ground electrode 14 of the conductor film on the upper surface of the substrate through the through hole 13C.
Connected to C. Also, the third strip conductor 1 of the conductor film
The rear end of 2C extends to the back surface of the protrusion 11D and is connected to the electrode terminal 1.
It is 5D. The electrode terminal 15D is also formed with a conductor on the upper surface of the protruding piece 11D, and the electrode terminals on the front and back sides of the protruding piece 11D are connected to each other via a through hole 16C.

The multilayer printed circuit board 10 is prepared by, for example, forming a first layer of conductive film and ff'2/l! This can be done by bonding a glass epoxy plate with a conductor film I (which will become an intermediate layer) on the front and back sides, and another plus epoxy plate with a third layer conductor film formed on the back side by heating, pressure bonding, etc. Pattern formation of each conductor film is performed by etching technology.

Note that two ferrites 2 are placed across the center conductor shown in FIGS. 1 and 2 as shown in FIG. The configuration in which the ferrite 2 is housed in a case, permanent magnets 5 are provided above and below or on one side of the shield case 3, and a DC magnetic field is applied to the ferrite 2 is the same as in the conventional case. However, the ground electrodes 14A, 14B, and 14C are connected to the shield case 3.
connected to electrode terminals 15A, 15B (or 15C),
The three terminals of 15D serve as input/output terminals when used as a circulator, and when the electrode terminals 15B and 15C are terminated, it becomes an isolator with two electrode terminals 15A and 15D as input/output terminals.

(Effects of the Invention) As explained above, according to the non-reciprocal circuit element of the present invention, when the center conductor section is configured by making at least three or more strip conductors intersect with each other, the at least three or more strips Since the conductor is composed of at least three layers of conductor films provided on the printed wiring board, the following effects can be obtained.

(1) The angle of each strip conductor can be accurately defined to, for example, 120°, and variations in characteristics can be reduced.

(2) Since each strip conductor is formed of a multilayer conductor film on a multilayer printed ftfA board, the creepage gap between each conductor is significant, and for example, it can withstand the power of about 5 layers at 800MHz to 900MHz. .

(3) Jfl is easy to assemble and has excellent mass productivity.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a non-reciprocal circuit element according to the present invention, showing a component that becomes the center conductor, FIG. 2 is a perspective view similarly looking at the bottom side, and FIG. FIG. 4 is a front sectional view schematically showing the overall configuration of a reversible circuit element, and a perspective view of a component that becomes a central conductor of a conventional irreversible circuit element. DESCRIPTION OF SYMBOLS 1... Center conductor part, 2... Ferrite, 3... Shield case, 5... Permanent magnet, 10... Multilayer insulation board, 11A to 11D... Projection piece, 12A to 12C
... Strip conductor, 13A to 13C, 16A to 16C... Through hole, 14A to 14C... Earth electrode, 15A to 15D... Electrode terminal.

Claims (5)

[Claims] (1) In a non-reciprocal circuit element in which the central conductor portion is formed by intersecting at least three strip conductors,
A non-reciprocal circuit element characterized in that the at least three or more strip conductors are constituted by at least three layers of conductor films provided on an insulating substrate. (2) The irreversible circuit element according to claim 1, wherein the insulating substrate is a multilayer printed wiring board, and the electrode terminals formed on the substrate are connected to the strip conductors through through holes. (3) The irreversible circuit element according to claim 1, wherein the insulating substrate is a multilayer printed wiring board, and the electrode terminals formed on the substrate and the strip conductor are integrated. (4) The non-reciprocal circuit element according to claim 2 or 3, wherein the electrode terminals are formed on projecting pieces that project parallel to each other from both side edge ends of the multilayer printed wiring board. . (5) The irreversible insulating substrate according to claim 1, wherein the insulating substrate is a multilayer printed wiring board, and any of the strip conductors is arranged in a direction perpendicular to an edge of the multilayer printed wiring board. circuit element.