JP2006129316A - Non-reciprocal circuit element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly productive, inexpensive and thin non-reciprocal circuit element. <P>SOLUTION: The non-reciprocal circuit element comprises a ferrite component 6, a first, a second, and a third center conductors 10, 11, and 12 located on the ferrite component 6, a magnet 2 arranged on the center conductors, a first yoke 1 covering the top surface of the magnet 2, and a second yoke 3 for constituting a magnetic closed circuit with the first yoke 1. The first and the second center conductors 10 and 11 are arranged at both surfaces of an insulated thin plate 9 of one sheet dielectric, and the third center conductor 12 is arranged on the top surface of the ferrite component 6 by making the dielectric intervene with the second center conductor 11. Accordingly, the insulated thin plate 9 can be made thinner compared with a conventional one. Hence, the non-reciprocal circuit element is highly productive, inexpensive and thin. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an irreversible circuit element including an isolator or a circulator applied to an antenna duplexer or the like.

  4 is an exploded perspective view of a conventional non-reciprocal circuit element. FIG. 5 is an exploded perspective view of a multilayer substrate according to the conventional non-reciprocal circuit element. Next, when the conventional non-reciprocal circuit element is applied to an isolator, FIG. The configuration will be described with reference to FIGS. 4 and 5. The conventional non-reciprocal circuit element includes a box-shaped first yoke 51, a round magnet 52 disposed in the first yoke 51, A U-shaped second yoke 53 coupled to one yoke 51, a resin case 55 which is attached to the second yoke 53 and holds a disk-shaped ferrite member 54, a magnet 52 and a ferrite member 554. And a multilayer substrate 56 disposed between the two.

  The multilayer substrate 56 is formed by stacking first to seventh ceramic sheets 57a to 57g. The first ceramic sheet 57a has a first central conductor 58, and the second ceramic sheet 57b has a first central conductor 58. A second center conductor 59 is formed, and a third center conductor 60 is formed on the third ceramic sheet 57c.

  The fourth ceramic sheet 57d has a ground electrode 61, the fifth ceramic sheet 57e has a plurality of capacitor electrodes 62, the sixth and seventh ceramic sheets 57f and 57g have a ground electrode 61, and A plurality of capacitors are formed between the capacitor electrode 62 and the ground electrode 61, and a resistor 63 is provided on the seventh ceramic sheet 57g to constitute a conventional non-reciprocal circuit element made of an isolator. Has been. (For example, see Patent Document 1)

  However, since the conventional non-reciprocal circuit device uses the multilayer substrate 56 in which the first to seventh ceramic sheets 57a to 57g on which the first to third center conductors 58, 59, 60 and the like are formed are used. The productivity was poor, the cost was high, and the mold was thick.

JP 7-283614 A

  A conventional non-reciprocal circuit element is a multilayer substrate in which first to seventh ceramic sheets 57a to 57g on which first to third central conductors 58, 59, 60, etc. are formed are laminated. Since 56 is used, there is a problem that the productivity is poor and the cost is increased and the thickness is increased.

  Accordingly, an object of the present invention is to provide a thin, non-reciprocal circuit device that is highly productive, inexpensive, and thin.

  As a first means for solving the above problems, a flat ferrite member and a ferrite member positioned on the ferrite member, provided on different surfaces in the vertical direction across the dielectric, and partially in the vertical direction First, second, and third center conductors that intersect, a magnet disposed on the center conductor, a first yoke disposed to cover the upper surface of the magnet, and a lower surface side of the ferrite member And a second yoke that forms a magnetic closed circuit with the first yoke, and has an insulating thin plate that forms the dielectric, and the upper surface of the insulating thin plate has the first central conductor And the second central conductor is formed on the lower surface of the insulating thin plate, and the third central conductor is disposed on the upper surface of the ferrite member and on the upper surface of the ferrite member. , With the second central conductor down Serial insulating sheet is disposed, between said second center conductor and the third center conductor, it has a structure obtained by interposing the dielectric.

  As a second solution, a capacitor having first and second electrodes facing each other with an insulator interposed therebetween is provided, and the first, second, and third electrodes are provided on the lower surface of the insulating thin plate. A conductive pattern connected to each port portion of the central conductor is formed, and a first electrode of the capacitor is connected to the conductive pattern, and a plurality of the capacitors are arranged on the lower surface of the insulating thin plate It was.

  As a third solution, the bottom plate of the second yoke has a plurality of inwardly projecting protrusions, and the second electrode of the capacitor is connected to the upper ends of the protrusions. It was set as the structure made.

  As a fourth solution, the upper surface of the ferrite member has the third central conductor formed of a conductive film, and the lower surface of the ferrite member has a ground conductor formed of a conductive film. And having a first connection body formed of a conductive film for connecting the ground portion of the third central conductor and the ground conductor to a side surface of the ferrite member, the ground conductor being the second conductor The yoke was in contact with the bottom plate.

  Further, as a fifth solution, the upper surface of the ferrite member has a plurality of land portions formed of a conductive film, and the side surface of the ferrite member is connected to the land portion and the ground conductor, It has the 2nd connection body formed with the electrically conductive film, It was set as the structure by which the earth part of the said 1st, 2nd center conductor was connected to the said land part.

As a sixth solution, a holding member made of an insulating material is provided in the second yoke, and the ferrite member is inserted in a substantially central portion of the bottom wall of the holding member. And the capacitor is positioned by the holding member.
As a seventh solution, a plurality of terminal members are provided on the bottom wall of the holding member, and the conductive pattern connected to the first and second central conductors is connected to the terminal member. The configuration was as follows.

As an eighth solution, the lower surface of the terminal member is exposed on the lower surface of the bottom wall of the holding member, and the lower surface of the terminal member and the lower surface of the bottom plate of the second yoke are flush with each other. It became the composition which became.
As a ninth solution, the insulating thin plate is formed of a flexible substrate, and the dielectric located between the second and third central conductors is formed of an insulating resist film.

The nonreciprocal circuit device of the present invention includes a flat ferrite member and first and second portions that are located on the ferrite member and are provided on different surfaces in the vertical direction across the dielectric, and partially cross in the vertical direction. Second and third center conductors, a magnet disposed on the center conductor, a first yoke disposed to cover the upper surface of the magnet, and a lower surface side of the ferrite member, And a second yoke that forms a magnetic closed circuit with the yoke, and has an insulating thin plate that forms a dielectric. A first central conductor is formed on the upper surface of the insulating thin plate, and the insulating thin plate A second center conductor is formed on the lower surface, and the third center conductor is disposed on the upper surface of the ferrite member, and an insulating thin plate is disposed on the upper surface of the ferrite member with the second center conductor downward. Between the second center conductor and the third center conductor. It has a structure obtained by interposing a dielectric.
That is, the first and second center conductors are provided on both surfaces of one insulating thin plate, and the third center is provided on the upper surface of the ferrite member with a dielectric interposed between the second center conductors. Since the conductor is provided, the number of insulating thin plates can be reduced as compared with the conventional case, the productivity can be reduced and the cost can be reduced, and a thin non-reciprocal circuit device can be obtained.

  In addition, a capacitor having first and second electrodes facing each other with an insulator interposed therebetween is provided, and the lower surface of the insulating thin plate is connected to the respective port portions of the first, second and third central conductors. The conductive pattern is formed, and the first electrode of the capacitor is connected to the conductive pattern, and a plurality of capacitors are arranged on the lower surface of the insulating thin plate. A good one is obtained.

  In addition, the bottom plate of the second yoke has a plurality of convex portions projecting inward, and the second electrode of the capacitor is connected to the upper end of the convex portion, so that the capacitor can be easily grounded. Thus, a product with good assemblability can be obtained.

  Further, the upper surface of the ferrite member has a third central conductor formed of a conductive film, the lower surface of the ferrite member has a ground conductor formed of a conductive film, and on the side surface of the ferrite member, The ground portion of the third central conductor is connected to the ground conductor, and the first connecting body is formed of a conductive film. Since the ground conductor is in contact with the bottom plate of the second yoke, the thickness can be reduced. The center conductor of 3 can be easily grounded.

  In addition, the ferrite member has a plurality of land portions formed of a conductive film on the upper surface thereof, and a second connection body formed of the conductive film by connecting the land portion and the ground conductor to the side surface of the ferrite member. Since the ground portions of the first and second center conductors are connected to the land portions, the ground portions are landed by stacking the insulating thin plates on which the first and second center conductors are formed on the ferrite member. It can be grounded through the portion, and a product with good assemblability can be obtained.

  In addition, a holding member made of an insulating material is provided in the second yoke, and a through hole for positioning in a state where the ferrite member is inserted is provided in a substantially central portion of the bottom wall of the holding member, and a capacitor Is positioned by the holding member, a stable attachment of the ferrite member and the capacitor can be obtained.

  In addition, since a plurality of terminal members are provided on the bottom wall of the holding member, and the conductive pattern connected to the first and second center conductors is connected to the terminal members, the first and second center conductors By stacking the insulating thin plates formed with the ferrite member on the ferrite member, the conductive pattern can be connected to the terminal member, and the one with good assemblability can be obtained.

  Further, the lower surface of the terminal member is exposed on the lower surface of the bottom wall of the holding member, and the lower surface of the terminal member and the lower surface of the bottom plate of the second yoke are flush with each other, so that a suitable one for surface mounting is obtained. .

  In addition, since the insulating thin plate is formed of a flexible substrate and the dielectric located between the second and third central conductors is formed of an insulating resist film, an inexpensive product with good productivity can be obtained.

  FIG. 1 is an exploded perspective view of the non-reciprocal circuit element of the present invention, and FIG. 2 is an exploded perspective view of the non-reciprocal circuit element of the present invention as seen from the inverted state. FIG. 3 is a cross-sectional view of the main part of the non-reciprocal circuit device of the present invention.

  Next, the configuration when the non-reciprocal circuit device of the present invention is applied to an isolator will be described with reference to FIGS. 1 to 3. The first yoke 1 made of a U-shaped magnetic plate (iron plate or the like) A rectangular upper plate 1a, a side plate 1b bent downward from a side of the upper plate 1a, a plurality of notches 1c provided on opposite sides of the upper plate 1a, an upper plate 1a and a side plate 1b A plurality of holes 1d provided in the vicinity of the connecting portion.

  The rectangular (rectangular) magnet 2 is positioned in the first yoke 1, and the upper surface thereof is in contact with the inner surface of the upper plate 1a. It is attached.

The second yoke 3 made of a U-shaped magnetic plate (iron plate or the like) has a quadrangular bottom plate 3a, a side plate 3b bent upward from the side of the bottom plate 3a, and an inside projecting from the bottom plate 3a. It has a plurality of protrusions 3c, a plurality of cutouts 3d provided on opposite sides of the bottom plate 3, and a plurality of claw portions 3e protruding upward from the tip of the side plate 3b.
In the second yoke 3, the claw portion 3e is bent after the claw portion 3e is inserted into the hole 1d of the first yoke 1 with the bottom plate 3a facing the top plate 1a. Thus, a magnetic closed circuit is formed by being coupled to the first yoke 1.

  The holding member 4 made of a synthetic resin molded product includes a bottom wall 4b having a through hole 4a in the center, a plurality of compartments 4c provided in the bottom wall 4b, and a bottom wall in which each compartment 4c is located. A plurality of holes 4d provided in 4b, a plurality of convex portions 4e projecting downward from the bottom wall 4b, a side wall 4f projecting upward from opposite sides of the bottom wall 4b, and an upper side from the tip of the side wall 4f 4g.

  Further, a terminal member 5 is provided at the position of the convex portion 4e of the holding member 4 by embedding or the like. The terminal member 5 is exposed on the upper surface of the bottom wall 4b and on the lower surface of the bottom wall 4b. Terminal 5b to be connected and a connection portion for connecting the terminals 5a and 5b (not shown here).

In the holding member 4 having such a configuration, the convex portion 4e is fitted into the cutout portion 3d of the bottom plate 3a while the bottom wall 4b is placed on the bottom plate 3a of the second yoke 3, and the protrusion 4e is protruded. The piece 4g is fitted into the notch 1c of the upper plate 1a and attached to the first and second yokes 1 and 3.
When the holding member 4 is attached, the convex portions 3c provided on the bottom plate 3a are inserted into the respective holes 4d of the holding member 4, and the lower surface of the terminal member 5 is connected to the bottom plate 3a. It is flush with the bottom surface.

A flat ferrite member 6 made of YIG (Yttrium iron garnet) or the like is disposed between the magnet 2 and the bottom plate 3 a in the second yoke 3, and a ground conductor 7 is provided on the entire lower surface of the ferrite member 6. Further, on the side surface of the ferrite member 6, one first connection body 8 a connected to the ground conductor 7 and two second connection bodies 8 b are provided. Two land portions 8c connected to the second connection body 8b are provided at opposite corner portions of the upper surface.
The ground conductor 7, the first and second connecting bodies 8a and 8b, and the land portion 8c are formed of a conductive film formed by applying, printing, vapor deposition, or the like with a conductive material.

  The ferrite member 6 having such a configuration is inserted and positioned in the through hole 4a of the holding member 4, and the ground conductor 7 provided on the lower surface of the ferrite member 6 is in contact with the bottom plate 3a and grounded. It becomes a state.

The insulating thin plate 9 which is a dielectric is formed of a flexible substrate or the like and has a plurality of holes 9a. The upper surface of the insulating thin plate 9 is provided with a first central conductor 10 and the lower surface of the insulating thin plate 9 Is provided with a second central conductor 11.
In addition, a third center conductor 12 is provided on the upper surface of the ferrite member 6, and the third center conductor 12 is configured by a conductive film formed by applying, printing, vapor deposition, or the like with a conductive material. .
The third central conductor 12 may be formed of a thin metal plate and may be provided on the upper surface of the ferrite member 6 by pasting or the like.

  Each of the first, second, and third center conductors 10, 11, and 12 includes port portions 10a, 11a, and 12a and ground portions 10b, 11b, and 12b. The port portion 10a and the ground portion 10b are formed to extend to the position of the hole 9a of the insulating thin plate 9, and the ground portion 12b of the third central conductor 12 is connected to the first connector 8a. ing.

  Further, provided on the lower surface of the insulating thin plate 9 is connected to the first conductive pattern 13 a provided at a position facing the port portion 10 a of the first center conductor 10 and the port portion 11 a of the second center conductor 11. The second conductive pattern 13b, the third conductive pattern 13c connected to the third central conductor 12, and the fourth conductive pattern provided at a position facing the ground portion 10b of the first central conductor 10. It has a pattern 13d.

A through hole provided in the hole 9a is provided between the port portion 10a of the first central conductor 10 and the first conductive pattern 13a and between the ground portion 10b of the first central conductor 10 and the fourth conductive pattern 13d. While being connected by a connection conductor 14 such as a hole, at least a part of the second center conductor 11 is covered with an insulating resist film 15 which is a dielectric.
The insulating resist film 15 that is a dielectric may be provided on the third center conductor 12 side instead of the second center conductor 11 side.

The chip-type first, second, and third capacitors C1, C2, and C3 are respectively opposed to the first electrode 17a provided on the insulator 16 and the first electrode 17a across the insulator 16. A second electrode 17b is provided.
The first electrodes 17a of the first, second, and third capacitors C1, C2, and C3 are connected to the first, second, and third conductive patterns 13a, 13b, and 13c, respectively, by soldering. .

  The chip-type resistor R has a pair of electrodes 18a and 18b provided on the opposite end face sides, and the resistor R is disposed in the vicinity of the third capacitor C3 and has one electrode 18a. Are soldered and connected to the third conductive pattern 13c.

  When the insulating thin plate 9 having such a configuration is placed on the upper surface of the ferrite member 6 with the second central conductor 11 and the first to third capacitors C1 to C3 and the like facing downward, the first and second With the insulating thin plate 9 that is a dielectric between the central conductors 10 and 11 and the insulating resist film 15 that is a dielectric between the second and third central conductors 11 and 12, the first and second The third central conductors 10, 11, and 12 are arranged so as to partially intersect each other in the vertical direction at intervals of 120 degrees on different surfaces in the vertical direction across the dielectric (the insulating thin plate 9 and the insulating resist film 15). It will be in the state.

  At this time, the first to third capacitors C1 to C3 and the resistor R are housed and positioned in the respective compartments 4c of the holding member 4, and the second of the first to third capacitors C1 to C3. The other electrode 17b of the resistor R and the other electrode 18b of the resistor R are connected to the top of the convex portion 3c of the bottom plate 3a to be grounded.

  The first conductive pattern 13a connected to the port portion 10a of the first central conductor 10 is connected to the terminal 5a of one terminal member 5 provided on the holding member 4, and the second central conductor. The second conductive pattern 13b connected to the 11 port portion 11a is connected to the terminal 5a of the other terminal member 5 provided on the holding member 4, and the ports of the first and second central conductors 10 and 11 are connected. The parts 10 a and 11 a can be connected to an external device by the terminal member 5.

  Further, the third conductive pattern 3c is connected to the port portion 12a of the third central conductor 12, and the fourth conductive pattern 13d connected to the ground portion 10b of the first central conductor 10 The ground portion 11b of the second central conductor 11 is connected to the land portion 8c and is connected to the other land portion 8c, and the bottom plate 3a is connected via the second connecting body 8b and the ground conductor 7. It is designed to be grounded.

With such a configuration, the nonreciprocal circuit element of the present invention made of an isolator is formed. The nonreciprocal circuit element of the present invention is incorporated in a surface mount on a circuit board of an external device, although not shown here. It is like that.
That is, the bottom plate 3a of the second yoke 3 and the terminal 5b of the terminal member 5 are placed on the circuit board of the external device and soldered to the wiring pattern on the circuit board so as to be surface mounted. It has become.

  In addition, although the said Example demonstrated as what was applied to the isolator, you may apply to the circulator which eliminated the resistor R.

The disassembled perspective view which concerns on the nonreciprocal circuit device of this invention. The disassembled perspective view which looked at the nonreciprocal circuit element of this invention from the state turned over. The principal part sectional drawing concerning the nonreciprocal circuit device of this invention. The disassembled perspective view of the conventional nonreciprocal circuit device. The disassembled perspective view of the multilayer substrate which concerns on the conventional nonreciprocal circuit element.

Explanation of symbols

1: First yoke 1a: Upper plate 1b: Side plate 1c: Notch portion 1d: Hole 2: Magnet 3: Second yoke 3a: Bottom plate 3b: Side plate 3c: Convex portion 3d: Notch portion 4e: Claw portion 4 : Holding member 4a: Through hole 4b: Bottom wall 4c: Partition chamber 4d: Hole 4e: Projection 4f: Side wall 4g: Projection piece 5: Terminal member 5a, 5b: Terminal 6: Ferrite member 7: Ground conductor 8a: First Connection body 8b: second connection body 8c: land portion 9: insulating thin plate (dielectric)
9a: hole 10: first center conductor 10a: first port portion 10b: ground portion 11: second center conductor 11a: second port portion 11b: ground portion 12: third center conductor 12a: third Port portion 12b: Earth portion 13a: First conductive pattern 13b: Second conductive pattern 13c: Third conductive pattern 13d: Fourth conductive pattern 14: Connection conductor 15: Insulating resist film C1: First capacitor C2: Second capacitor C3: Third capacitor 16: Insulator 17a: First electrode 17b: Second electrode R: Resistor 18a: Electrode 18b: Electrode

Claims (9)

A flat ferrite member and first, second, and third central conductors that are located on the ferrite member and are provided on different surfaces in the vertical direction across the dielectric, and partially intersect in the vertical direction; The magnet disposed on the central conductor, the first yoke disposed so as to cover the upper surface of the magnet, and the lower surface of the ferrite member, and the first yoke forms a magnetic closed circuit. An insulating thin plate that forms the dielectric, and the first central conductor is formed on the upper surface of the insulating thin plate, and the lower surface of the insulating thin plate includes: The second central conductor is formed, the third central conductor is disposed on the upper surface of the ferrite member, and the insulating thin plate is disposed on the upper surface of the ferrite member with the second central conductor facing downward. And the second center conductor and the front Between the third central conductor, non-reciprocal circuit element characterized in that by interposing the dielectric. A capacitor having first and second electrodes facing each other with an insulator interposed therebetween is provided, and the lower surface of the insulating thin plate is connected to the respective port portions of the first, second and third central conductors. 2. The conductive pattern according to claim 1, wherein a first electrode of the capacitor is connected to the conductive pattern, and a plurality of the capacitors are disposed on a lower surface of the insulating thin plate. Non-reciprocal circuit element. The bottom plate of the second yoke has a plurality of convex portions protruding inward, and the second electrode of the capacitor is connected to an upper end of the convex portion. 3. The nonreciprocal circuit device according to 2. The upper surface of the ferrite member has the third central conductor formed of a conductive film, and the lower surface of the ferrite member has a ground conductor formed of a conductive film, and on the side surface of the ferrite member. Is connected to the ground portion of the third central conductor and the ground conductor, and has a first connection body formed of a conductive film, and the ground conductor is in contact with the bottom plate of the second yoke. 4. The nonreciprocal circuit device according to claim 2, wherein the circuit is a nonreciprocal circuit device. A top surface of the ferrite member has a plurality of land portions formed of a conductive film, and a side surface of the ferrite member is connected to the land portion and the ground conductor to form a second land formed of a conductive film. 5. The nonreciprocal circuit device according to claim 4, further comprising a connection body, wherein ground portions of the first and second center conductors are connected to the land portion. A holding member made of an insulating material is provided in the second yoke, and a substantially central portion of the bottom wall of the holding member has a through hole for positioning in a state where the ferrite member is inserted, and The nonreciprocal circuit device according to claim 2, wherein the capacitor is positioned by the holding member. The bottom wall of the holding member is provided with a plurality of terminal members, and the conductive pattern connected to the first and second central conductors is connected to the terminal member. 6. The nonreciprocal circuit device according to 6. The lower surface of the terminal member is exposed on the lower surface of the bottom wall of the holding member, and the lower surface of the terminal member and the lower surface of the bottom plate of the second yoke are flush with each other. Item 8. The nonreciprocal circuit device according to Item 7. 9. The insulating thin film according to claim 1, wherein the insulating thin plate is formed of a flexible substrate, and the dielectric located between the second and third central conductors is formed of an insulating resist film. The nonreciprocal circuit device described.

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