JPH0851303A - Irreversible circuit element - Google Patents

Abstract

PURPOSE:To provide a highly precise irreversible circuit element with simple structure. CONSTITUTION:A central conductor is formed of two linear conductor patterns 151a, 151b and 153a, 153b which are formed on the surface 15a and the rear surface 15b of a printed board 15 having the two sides of a single layer and which make the crossed angle of 120 degrees, and by conductor patterns 152a, 152b, 154a and 154b which make the crossed angles of 120 degrees with the conductor patterns and which are formed on the surface and the back of the substrate as if they were sewn. Thus, signals are transmitted without a loss since the conductor patterns 151a, 151b, 153a and 153b on input/output do not have through holes on surface facing a magnetic body. Thus, an inductance component formed by the through hole can considerably be reduced and a satisfactory irreversible characteristic can be obtained.

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, which is a microwave band high frequency component.

[0002]

2. Description of the Related Art Generally, a non-reciprocal circuit element such as a lumped-constant type isolator or a circulator has a function of causing almost no attenuation in the signal transmission direction and increasing in the opposite direction. It is used in the transmission circuit of mobile communication devices such as car phones.

The following three types of isolator and circulator configurations have been conventionally known. First, as shown in FIG. 2, first, the ferrite 7 is wrapped by the metallic conductors 9a to 9c forming the central conductor portion 8 and the conductors 9a to 9c are crossed with each other at an angle of 120 degrees, and the insulating film 14a is formed. , 14b are interposed between the conductors 9a ...
Insulate between 9b. This is inserted into the central hole in which the metal case 1, the shield plate 2, and the capacitor substrate 4 on which the electrode piece 3 is mounted are stacked, and they are connected by soldering. The terminating resistor 13 is connected between the capacitance pattern 5c and the ground pattern 6b. An isolator is completed by joining a metal cover 12 to which a permanent magnet 11 is bonded to the integrated metal case 1.

FIG. 3 shows an example in which the conductors 9a to 9c forming the central conductor portion 8 are formed by a conductor pattern on the printed circuit board 15 as a second structure. This makes full use of through holes and divides one set of conductors in the length direction,
Handling is simplified by combining three sets of conductors on the front and back of the board.

Further, as a third structure, as shown in FIG. 4, a set of conductors is provided in three layers of the multilayer printed circuit board 16 to form a central conductor portion 8, and a through hole is provided on the ferrite 7. There is also a type that does not.

[0006]

However, the above-mentioned conventional non-reciprocal circuit device has the following problems in the central conductor portion.

That is, the metal conductor type of the first configuration example is difficult to fold and cannot provide accuracy, and the productivity is low. Also, in the double-sided printed circuit board type of the second configuration example, since the through holes to the front and back of the board of the conductor are located on the ferrite 7, these through holes affect the insertion loss and deteriorate the performance. Further, the laminated type in which the central conductor portion 8 is configured by the laminated printed circuit board 16 of the third configuration example becomes thicker than at least the double-sided printed circuit board type, and the distance from the surface of the ferrite 7 to the outermost layer is increased, There was a problem that the effect of No. 7 was reduced and the irreversibility was diminished.

In view of the above problems, an object of the present invention is to provide a highly accurate nonreciprocal circuit device having a simple structure.

[0009]

In order to achieve the above object, the present invention provides, in claim 1, one end of which is connected to the other.
A non-reciprocal circuit device including three central conductors intersecting at 0 degrees, a magnetic body facing the central conductors, and a capacitor connected to the other end of each central conductor, on a surface of a wiring board. A first conductor pattern formed of two substantially straight parallel conductors formed and two substantially straight lines formed on the back surface of the wiring board and intersecting the first conductor pattern at an angle of 120 degrees. Second conductor pattern formed of parallel conductors, and formed on the front and back surfaces of the wiring board at an angle of 120 degrees with each of the first conductor pattern and the second conductor pattern, and the first and second conductor patterns. A nonreciprocal circuit device is proposed in which the central conductor is composed of a third conductor pattern composed of two substantially straight parallel conductors connected by a through hole so as not to contact the second conductor pattern.

A second aspect of the present invention proposes the nonreciprocal circuit element according to the first aspect, wherein the wiring board is a single-layer double-sided board.

According to a third aspect of the present invention, in the nonreciprocal circuit device according to the first aspect, the distance between the central portions of the two conductor patterns forming each of the first to third conductor patterns is the distance between both ends. We propose a non-reciprocal circuit device that is wider than the above.

Further, a fourth aspect proposes the nonreciprocal circuit element according to the first aspect, wherein the through hole is a landless through hole.

[0013]

According to claim 1 of the present invention, the center conductor is formed on the back surface of the wiring board and the first conductor pattern formed of two substantially straight parallel conductors formed on the surface of the wiring board. And a second conductor pattern composed of two substantially straight parallel conductors intersecting the first conductor pattern at an angle of 120 degrees, and 120 of each of the first conductor pattern and the second conductor pattern. A third parallel conductor formed on the front and back surfaces of the wiring board at an angle of 4 degrees and connected by through holes so as not to contact the first and second conductor patterns. And a conductor pattern. As a result, by using the first and second conductor patterns for inputting and outputting a signal, the conductor pattern relating to the input and output does not have a through hole on the surface facing the magnetic body, so that signal transmission can be performed without loss. Be seen.

Further, according to claim 2, since the wiring board is a single-layer double-sided board, when the magnetic body is arranged facing the wiring board, the magnetic body and the first to third layers are arranged. The distances to the conductor patterns are all substantially the same, and the respective inductances of the three conductor patterns forming the central conductor are substantially the same.

According to the third aspect of the invention, the distance between the two parallel conductors forming the first to third conductor patterns is narrowed at the input / output portion to / from the magnetic body, so contact with other conductors is prevented. You can avoid it, as it spreads in the central part,
Clearance at the intersection can be achieved without bending.

Further, according to the present invention, since the through hole is composed of a landless through hole, a clearance with another conductor is secured, and signal reflection and attenuation due to the land of the through hole are reduced. It

[0017]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an isolator according to an embodiment of the present invention. In the figure, the same components as those in the conventional example described above are represented by the same reference numerals. Further, the difference between the conventional example and the present embodiment is that the central conductor portion 8 is formed by the printed board 15.

In FIG. 1, 1 is a metal case, 2 is a shield plate made of a conductor, 4 is a capacitor substrate, 7 is a disk-shaped microwave ferrite, 11 is a disk-shaped permanent magnet having the same area as the microwave ferrite, for example. Reference numeral 12 is a metal cover, 13 is a chip type terminating resistor, and 15 is a ceramic dielectric substrate for single-layer double-sided wiring (hereinafter referred to as a substrate).

The substrate 15 is formed, for example, in a square shape as shown in FIG. 5, and on the surface 15a thereof, grounding conductor patterns 10a to 10c are formed by printing on the upper center and lower left and right sides, and the upper left and right sides are formed. Land conductor patterns 9a to 9 connected to the input / output terminals are provided on both sides and the lower central portion.
c is printed. Further, between the land conductor pattern 9c formed on the upper right side and the grounding conductor pattern 10c on the lower left side, two conductor patterns 151a and 151b having both ends connected thereto are formed. These conductor patterns 151a and 151b are arranged with a predetermined gap therebetween, and are formed such that the gap between the central portions thereof is wider than the gap between both end portions. As a result, the distance between the two conductor patterns 151a and 151b is set to the ferrite 7 and the permanent magnet 11.
Since it becomes narrow at the input / output portion to the area opposed to, it is possible to avoid contact with other conductors, and since it spreads at the central portion, it is possible to make clearance at the intersecting portion without bending.

Further, the land conductor pattern 9c provided in the lower center and the ground conductor pattern 10c in the upper center.
And an angle of 120 degrees with respect to the above-described conductor patterns 151a and 151b.
Two conductor patterns 152a and 152b are formed so as to sew a and 151b. Here, the conductor patterns 151a and 151b are in a non-contact state with the conductor patterns 152a and 152b, and the conductor patterns 152a and 152b are arranged at a predetermined interval similarly to the conductor patterns 151a and 151b. The interval of the central portion is formed so as to be wider than the interval of both end portions as described above.

A terminating resistor 13 is connected between the grounding conductor pattern 10b and the landing conductor pattern 9c.

On the other hand, on the back surface 15b of the substrate 15,
Ground conductor patterns 10d-10 having a predetermined area are provided at positions corresponding to the ground conductor patterns 10a-10c on the surface 15a.
f is formed and the land conductor pattern 9 on the surface is formed.
Land conductor patterns 9d to 9f having a predetermined area are formed at positions corresponding to a to 9c, and the conductor patterns facing the front and back surfaces are conductively connected through through holes TH1 to TH8, respectively.

Also, between the land conductor pattern 9d formed on the upper right side and the grounding conductor pattern 10d on the lower left side, two conductor patterns are connected at both ends.
153a and 153b are formed. These conductor patterns 15
3a and 153b are arranged with a predetermined gap therebetween, and are formed such that the gap between the central portions thereof is wider than the gap between both end portions, as described above. Here, these conductor patterns 153a and 153b are the conductor patterns 151a, 151b and 15b on the surface.
It is arranged so as to form an angle of 120 degrees with each of 2a and 152b.

Further, a conductor pattern on the surface is provided between the land conductor pattern 9f and the ground conductor pattern 10f.
Two conductor patterns 154a and 154b corresponding to 152a and 152b
Are formed, and the conductor patterns 152a and 152b and the conductor pattern 15 are formed.
4a and 154b are connected through landless through holes THa to THf.

The capacitance substrate 4 has a thickness corresponding to the thickness of the microwave ferrite, has the same shape as the substrate 15, and has an opening of a predetermined area into which the microwave ferrite 7 can be inserted and arranged. The portion 4a is formed. Further, around the opening 4a on the surface of the capacitance substrate 4, conductor patterns 5a to 5c for forming capacitance are formed at positions corresponding to the conductor patterns 9a to 9c of the printed circuit board 15, and a conductor pattern for grounding. Grounding conductor patterns 6a to 6c are formed corresponding to 10a to 10c. Further, the electrode terminals 3 are attached to the conductor patterns 5a, 5b, 6a and 6b, respectively.

At the time of assembly, the opening 4a of the capacitance substrate 4
After the ferrite 7 is inserted and placed in the capacitor board 4,
The substrate 15 is placed on top of it. As a result, the substrate 1
The conductor patterns 10d to 10f for grounding on the rear surface of 5 are conductively contacted with the conductor patterns 6a to 6c for grounding, and the conductor patterns 9d to 9f are conductively contacted with the conductor patterns 5a to 5c. Further, with the permanent magnet 11 arranged on the central portion of the substrate 15 and the shield plate 2 arranged under the capacitor substrate 4, all of them are housed in the metal case 1 and covered by the metal cover 12. As a result, a magnetic closed circuit is formed, and the assembly of the isolator element is completed.

Here, a notch is formed in the metal case 1 so as to correspond to the electrode terminal 3, and wiring can be made to the electrode terminal 3 from outside the metal case 1.

According to the above-mentioned structure, the inductor L1 in the circuit diagram shown in FIG. 6 is formed by the conductor patterns 153a and 153b, the inductor L2 is formed by the conductor patterns 151a and 151b, and the inductor L3 is formed in the conductor patterns 152a, 152b, 154a and 154.
The capacitance C1 is constituted by the conductor pattern 5a and the shield plate 2, the capacitance C2 is constituted by the conductor pattern 5b and the shield plate 2, the capacitance C3 is constituted by the conductor pattern 5c and the shield plate 2, and the resistance value R is the terminating resistance. It is constituted by the container 13.

Therefore, according to the above-described embodiment, since the central conductor is formed by the conductor pattern formed by printing on the substrate 15, the intersecting angles can be accurately set to 120 degrees, Also, since three center conductors are formed on the front and back of the single-layer double-sided board in almost the same arrangement,
The distance between each center conductor and the ferrite 7 becomes equal,
Irreversible characteristics of each element rarely vary.

In addition, since no through holes are formed in the conductor patterns 151a, 151b, 153a, 153b relating to signal input / output in the portion where a direct magnetic field is applied by the ferrite 7 and the permanent magnet 11, there is no loss in signal transmission. It can be carried out.

The configuration of this embodiment is an example, and the present invention is not limited to this. For example, as shown in FIG. 7, the terminating resistor 13 is deleted, the electrode terminal 3 is connected to the conductor pattern 5c, and a notch is provided in the shield plate 2 and the metal case 1 correspondingly to form a circulator. can do.

[0032]

As described above, according to claim 1 of the present invention, by using the first and second conductor patterns for input / output of a signal, the conductor pattern for the input / output faces the magnetic body. Since there is no through-hole in the surface, the signal transmission is performed without loss, so that the inductance component formed by the through-hole can be significantly reduced compared to the conventional one, and good non-reciprocal characteristics can be obtained. .

Further, according to claim 2, in addition to the above effects, a single-layer double-sided plate is provided, whereby the magnetic body and the first to third conductor patterns arranged facing the wiring board are arranged. Since the distances are almost the same and the inductances of the three conductor patterns forming the central conductor are substantially the same, the matching capacitances connected to the three conductor patterns can be set to the same amount. Therefore, it is possible to improve work efficiency during manufacturing.

Further, according to claim 3, in addition to the above effect, the contact with other conductors can be avoided, and the clearance at the intersecting portion can be taken without curving.
Since the central conductor composed of the conductor pattern can be formed in a small size, a small magnetic body can be used correspondingly. As a result, the element shape can be reduced.

Further, according to claim 4, in addition to the above effect, a clearance with another conductor is secured, and signal reflection and attenuation due to the land of the through hole are reduced, so that the element shape is further improved. It is possible to achieve miniaturization and to obtain good characteristics.

[Brief description of drawings]

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

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

FIG. 3 is a configuration diagram showing a conventional example.

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

FIG. 5 is a configuration diagram showing a central conductor portion in one embodiment of the present invention.

FIG. 6 is a circuit diagram showing an isolator element according to an embodiment of the present invention.

FIG. 7 is a configuration diagram showing a circulator according to another embodiment of the present invention.

[Explanation of symbols]

Claims (4)

[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 the reversible circuit element, a first conductor pattern formed of two substantially linear parallel conductors formed on the surface of the wiring board, and a first conductor pattern formed on the back surface of the wiring board, which is 120 degrees apart. A second conductor pattern composed of two substantially straight parallel conductors intersecting at an angle, and the front and back surfaces of the wiring board at an angle of 120 degrees with each of the first conductor pattern and the second conductor pattern. And a third conductor pattern formed of two substantially straight parallel conductors connected by through holes so as not to contact the first and second conductor patterns A non-reciprocal circuit device characterized by the above. 2. The nonreciprocal circuit device according to claim 1, wherein the wiring board is a single-layer double-sided board. 3. The distance between the central portions of the two conductor patterns forming each of the first to third conductor patterns is
The nonreciprocal circuit device according to claim 1, wherein the nonreciprocal circuit device is formed so as to be wider than a space between both ends. 4. The nonreciprocal circuit device according to claim 1, wherein the through hole is a landless through hole.