JPH0715214A - Irreversible circuit element - Google Patents

Abstract

PURPOSE:To provide an irreversible circuit element capable of reducing the number of parts and obtaining correct cross angle of center conductors. CONSTITUTION:Conductor patterns 111a, 111b and 111c constituting parallel conductor patterns constituting one part of center conductors and the electrodes of capacitors and a resistor 113 are printed and formed on dielectric substrates 110 on both sides, a microwave ferrite 120, permanent magnet 140 and conductor board 130 are arranged above and under it, they are housed in shield cases 151 and 152, thus an isolator element is constituted. Thus, the dispersion of characteristics for each element can be reduced and further, parts cost and manufacturing cost can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonreciprocal circuit device such as an isolator or a circulator used in a high frequency circuit such as a microwave or a millimeter wave.

[0002]

2. Description of the Related Art Conventionally, non-reciprocal circuit elements such as circulators and isolators have a characteristic of transmitting electric power only in a predetermined specific direction and not transmitting electric power in the reverse direction.
Utilizing this characteristic, for example, a circulator is used as a multi-frequency demultiplexer combined with a transmission / reception demultiplexer or a filter circuit, and an isolator is used for impedance matching in a high-frequency circuit, transistor protection of an amplifier, etc. .

Lumped constant type non-reciprocal circuit elements have been assembled by individually forming the lumped constants of inductance and capacitance. The following three are typical examples of this configuration.

That is, as a first configuration example, as shown in FIGS. 2 and 3, a substrate 3 made of resin or ceramic having holes 3a for inserting the ferrite 1 and the mesh-shaped central conductor 2 is provided, The capacitance formed by the conductor patterns 3b, 3c, 3d formed on the substrate 3 and the inductance formed by the central conductor 2 are combined.

In this assembly, the ferrite 1 is surrounded by the central conductor 2 as shown in FIG.
The insulating films 4a and 4b are interposed so that the central conductors intersecting at an angle of degrees do not come into conductive contact with each other. Center conductor 2
Ferrite 1 wrapped in is inserted into hole 3a of substrate 3,
The three input / output electrodes 2a to 2c of the central conductor 2 are connected to the conductor patterns 3b to 3d which will be the capacitor electrodes on the substrate 3. Further, the permanent magnet 5 is placed on the upper part of the center conductor 2 and housed in the shield cases 6a and 6b. Here, a conductor pattern (not shown) for grounding is formed on one surface of the back surface of the substrate 3, and the conductor pattern is in contact with the shield case 6b.

As a second configuration example, as shown in FIGS. 4 and 5, the central conductor constituting the inductance in the first configuration example is printed on both sides as shown in FIGS. 5 (a) and 5 (b). Conductive patterns 7a are formed on the front surface 71 and the back surface 72 of the substrate 7.
~ 7j to form a capacitance 8b ~
8d is provided in combination on the perforated substrate 8.

In this assembly, the perforated substrate 8 is placed on a copper plate 9 having substantially the same shape as that of the perforated substrate 8.
Copper plate 1 with two cut-and-raised protrusions 10a to 10c
Stacked on 0. Here, a conductor pattern (not shown) for grounding is formed on the entire back surface of the perforated substrate 8, and this conductor pattern is in contact with the copper plate 9. A ferrite 11a is inserted and arranged in the holes 8a and 9a of the perforated substrate 8 and the copper plate 9, and the double-sided printed board 7 and the ferrite 11 are placed on the ferrite 11a.
b and the copper plate 12 are overlapped, and these are the protruding pieces 1 of the copper plate 10.
A predetermined portion is electrically connected by 0a to 10c and the whole is fixed. Further, a permanent magnet 13 is superposed on this, and these are housed in a plastic resin case 14 and shield cases 15a and 15b.

As a third configuration example, as shown in FIG. 6, a substrate 16 in which a ferrite insertion hole is not formed is used as the capacitance forming substrate in the first configuration example and is combined with the mesh-shaped center conductor 2. It was done.

In this assembly, the substrate 1 is placed on top of the central conductor 2 enclosing the ferrite 1 and the insulating films 4a and 4b.
6 are overlapped, and three input / output electrodes 2a to 2 of the center conductor 2 are stacked.
c is connected to the electrode patterns 16a to 16c on the substrate 16. Further, a frame 18 made of plastic resin on which an insulating film 17 and an input / output terminal are formed is stacked on the substrate 16, and a permanent magnet 19 is arranged below the central conductor 2, and all of them are shield cases 20a ... It is stored in 20c.

[0010]

However, the above-mentioned conventional non-reciprocal circuit device has the following problems. That is, in the first and third configuration examples, when the central conductor 2 is folded back when the ferrite 1 is wrapped, it is very difficult to set the intersecting angles to be exactly 120 degrees evenly. Since the distances between the input / output electrodes of the respective central conductors and the ferrite are different due to the overlapping, the characteristics of each element vary. Further, in the second configuration example, although the above-mentioned problems are solved, there is a problem that the cost of parts and the manufacturing cost are increased due to the large number of parts.

In view of the above problems, it is an object of the present invention to provide a non-reciprocal circuit device capable of reducing the number of parts and obtaining an accurate intersection angle of the center conductors.

[0012]

In order to achieve the above-mentioned object, the present invention has three center conductors, one end of which is connected to each other and intersects at 120 degrees, and a magnetic body facing the center conductor. In a non-reciprocal circuit device including a capacitor connected to the other end of each center conductor, a double-sided board having a conductor pattern forming the center conductor and a conductor pattern forming the electrodes of the capacitor is provided, We propose a nonreciprocal circuit device in which the magnetic material is arranged so as to face a conductor pattern that constitutes a conductor.

[0013]

According to the present invention, the conductor pattern forming the center conductor and the conductor pattern forming the electrode of the capacitor connected to the other end of the center conductor are formed by printing on the front and back surfaces of the double-sided board, A non-reciprocal circuit device is formed by arranging a magnetic body so as to face the conductor pattern. As a result, the intersection angle of the central conductors is the same for each element.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an isolator element according to an embodiment of the present invention. In the figure, 110 is a ceramic dielectric substrate (hereinafter referred to as substrate), 120 is a disc-shaped microwave ferrite, 130 is a conductor plate, 140 is a disc-shaped permanent magnet having the same area as the microwave ferrite, 151, 152 are It is a metal shield case.

The substrate 110 is formed, for example, in a square shape as shown in FIG. 7, and a conductor pattern serving as electrodes of three capacitors is provided on the surface of the substrate 110 except for the circular region 110a at the center.
111a, 111b, 111c and the conductor pattern 112 for grounding are formed by printing, and the conductor pattern 111c and the conductor pattern 112 are also formed.
A resistor 113 connected between and is formed by printing.
Here, the circular region 110a is set to have a shape corresponding to the microwave ferrite 120.

Further, a circular area at the center of the surface of the substrate 110
In the 110a, three sets of parallel conductor patterns 114a, 114b, 115a, 115b, 116a, 116b forming a part of the central conductor are radially formed in the radial direction from the central portion of the region, and the parallel conductor patterns are arranged between the parallel conductor patterns. The intersection angle is set to 120 degrees. Further, one end side of each parallel conductor pattern 114a, 114b, 115a, 115b, 116a, 116b is connected to the corresponding conductor pattern 111a, 111b, 111c.

On the back surface of the substrate 110, a conductor pattern 117 for grounding is printed and formed on the entire surface in a region outside the circular region corresponding to the circular region 110a at the center of the front surface. Further, in the circular area at the center of the back surface, parallel conductor patterns 114c, 114d, 115c, 115d, 115d, 115d, 115d, 115b, 115a, 115b, 116a, 116b, so as to extend in the same direction subsequently
116c and 116d are formed by printing, and one end side of each is connected to the conductor pattern 117 for grounding. Further, the other end side of each parallel conductor pattern 114c, 114d, 115c, 115d, 116c, 116d has through holes 114e, 114f, 115e, 115f, 116e, 1 respectively.
Corresponding parallel conductor patterns 114a, 114b, 115 via 16f
It is connected to the other end side of a, 115b, 116a, 116b. Also,
The grounding conductor pattern 117 on the back side of the substrate 110 is connected to the grounding conductor pattern 112 on the front side through the through holes 118, and the input / output terminals 119a and 119b are soldered to the front side conductor patterns 111a, 111b and 111c, respectively. It is attached.

The conductor plate 130 is made of, for example, a copper plate having a predetermined thickness, has the same shape as the substrate 110, and
An opening 131 having a predetermined area in which the microwave ferrite 120 can be inserted and arranged is formed in the central portion.

At the time of assembly, the opening 131 of the conductor plate 130
After the microwave ferrite 120 is inserted and arranged therein, the substrate 110 is arranged on the conductor plate 130 in an overlapping manner. As a result, the grounding conductor pattern 117 on the rear surface of the substrate 110 is
Conductive contact with 130. Further, with the permanent magnet 140 arranged on the central portion of the substrate 110, all of them are housed in the shield cases 151, 152, and the assembly of the isolator element is completed.

According to the configuration described above, the inductor L1 in the circuit diagram shown in FIG. 8 has parallel conductor patterns 114a to 114d.
As a result, the inductor L2 becomes parallel conductor patterns 115a-11
By 5d, the inductor L3 causes the parallel conductor pattern 116a-
116d respectively, the capacitor C1 is composed of the conductor patterns 111a and 117, the capacitor C2 is composed of the conductor patterns 111b and 117, and the capacitor C3 is composed of the conductor patterns 111a and 117.
111c and 117 respectively.

Therefore, according to the above-described embodiment, since the central conductor is formed by the conductor pattern formed by printing on the substrate 110, the intersecting angles thereof can be set accurately at 120 degrees, and Since the three central conductors are formed on the front and back surfaces of the double-sided substrate in substantially the same arrangement, the distances between the central conductors and the ferrite are equal, and the characteristics of each element rarely vary. Further, the number of parts is reduced as compared with the conventional example, and the parts cost and the manufacturing cost can be reduced.

The configuration of this embodiment is an example, and the present invention is not limited to this.

[0023]

As described above, according to the present invention, the conductor pattern forming the center conductor and the conductor pattern forming the electrode of the capacitor connected to the other end of the center conductor are formed by printing on the double-sided board. Since the non-reciprocal circuit element is formed by arranging the magnetic body facing the conductor pattern forming the central conductor, the number of parts can be reduced as compared with the conventional one, and thereby the cost can be reduced. You can Further, since the intersection angle of the central conductors is the same for each element, it is possible to reduce variations in characteristics of each element and always obtain the best characteristics as designed.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a first conventional example.

FIG. 3 is a diagram showing a surrounding structure of a central conductor and a ferrite in a first conventional example.

FIG. 4 is a configuration diagram showing a second conventional example.

FIG. 5 is a configuration diagram showing a substrate in a second conventional example.

FIG. 6 is a block diagram showing a third conventional example.

FIG. 7 is a configuration diagram showing a substrate according to an embodiment of the present invention.

FIG. 8 is a circuit diagram showing an isolator element according to an embodiment of the present invention.

[Explanation of reference symbols] 110 ... Ceramic dielectric substrate, 111a, 111b, 111c ... Conductor pattern (capacitor electrode), 112 ... Grounding conductor pattern, 113 ... Resistor, 114a to 114d, 115a to 115d, 116a to 11
6d… Parallel conductor pattern (center conductor), 114e, 114f, 115e, 1
15f, 116e, 116f, 118 ... through hole, 117 ... grounding conductor pattern, 120 ... microwave ferrite, 130 ... conductor plate, 140 ... permanent magnet, 151, 152 ... shield case.

Claims (1)

[Claims] 1. A non-equipment comprising: three central conductors, one end of which is connected to each other and intersecting at 120 degrees; a magnetic body facing the central conductor; and a capacitor connected to the other end of each of the central conductors. In a reversible circuit element, a double-sided substrate on which a conductor pattern forming the central conductor and a conductor pattern forming the electrode of the capacitor are formed is provided, and the magnetic body is arranged facing the conductor pattern forming the central conductor. A non-reciprocal circuit device characterized by the above.