JP2006129315A - Non-reciprocal circuit element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly productive and inexpensive non-reciprocal circuit element. <P>SOLUTION: The non-reciprocal circuit element comprises a ferrite component 4, a first, a second, and a third center conductors 5, 6, and 7 located on the ferrite component 4 and arranged at planes sandwiching a dielectric and being different in the vertical direction, a magnet 2 arranged on the center conductors, a first yoke 1 covering the top surface of the magnet 2, a second yoke 3 for constituting a magnetic closed circuit with the first yoke 1, and a plurality of capacitors C1 and C2 connected to center conductors 5 and 6 and a bottom plate 3a of the second yoke 3. Since an insulating substrate 15 provided with a terminal component 16 is laid on the capacitors C1 and C2, a conventional configuration becomes unnecessary in which a second yoke is arranged in a resin housing by insertion molding. Accordingly, the non-reciprocal circuit element is highly productive and inexpensive. <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.

  FIG. 7 is an exploded perspective view of a conventional non-reciprocal circuit element. Next, a configuration when the conventional non-reciprocal circuit element is applied to an isolator will be described with reference to FIG. A box-shaped first yoke 51, a square plate-shaped magnet 52 disposed in the first yoke 51, a disk-shaped ferrite member 53 disposed in the lower portion of the magnet 52, and 120 degrees Three first, second, and third central conductors 54, 55, and 56 that are attached to the ferrite member 53 at intervals and are partially crossed with each other, and a box that holds the ferrite member 53 And a U-shaped second yoke 58 disposed under the resin case 57.

And the magnet 52 is accommodated in the box-shaped 1st yoke 51, and the upper surface of the magnet 52 is adhere | attached on the inner surface of the 1st yoke 51 with the adhesive agent.
The first, second, and third center conductors 54, 55, and 56 are formed by punching a metal plate, and are formed to extend outward from a circular ground portion 70 located in the center. Each of the first, second, and third center conductors 54, 55, and 56 has first, second, and third port portions 54a, 55a, and 56a provided at end portions.

  The first, second, and third center conductors 54, 55, and 56 are arranged such that the ground portion 70 is first disposed on the lower surface of the ferrite member 53. In this state, the first, second, and third core conductors are disposed. The center conductors 54, 55, and 56 are bent along the side surface and the upper surface of the ferrite member 53.

  At this time, although not shown here, each of the first, second, and third center conductors 54, 55, and 56 positioned on the upper surface of the ferrite member 53 is vertically insulated while being insulated via a dielectric. Has been placed.

  The resin case 57 has a bottom wall 57b having a rectangular hole 57a at the center and a side wall 57c protruding upward from four sides of the bottom wall 57b. It is formed by insert molding together with the letter-shaped second yoke 58.

  The U-shaped second yoke 58 has a bottom plate 58a and a pair of side plates 58b bent upward from both ends of the bottom plate 58a. A part of the bottom plate 58a is exposed from the hole 57a. A plurality of terminals 59a, 59b, 59c are embedded in the side wall 57c of the resin case 57 located between the pair of side plates 58b.

  The ferrite member 53 to which the first, second, and third center conductors 54, 55, and 56 are attached is disposed in the hole 57a, and the first, second, and third center conductors 54, 55, and 56 are disposed. Is connected to the second yoke 58.

  Chip-type capacitors 62, 63, and 64, which are electronic components, and chip-type resistor 65 are arranged on bottom wall 57b located around hole 57a, and the lower surface electrodes of capacitor 62, 63, and 64 and resistor 65 are disposed. Are connected to terminals 59a, 59b and 59c, respectively, and the terminals 59a, 59b and 59c are connected to the ground side of the external device.

  The port portions 54a and 55a of the first and second center conductors 54 and 55 are soldered to the upper surface electrodes of the capacitors 62 and 63, and the port portion 56a of the third center conductor 56 is The upper surface electrode 64 and the upper surface electrode of the resistor 65 are soldered and connected to each other, and the port portions 54a and 55a of the first and second center conductors 54 and 55 are made of different parts. The terminal is connected to the hot side of the external device.

  Then, with the magnet 52 and the ferrite member 53 sandwiched between the first and second yokes 51 and 58 and the resin case 57, the first and second yokes 51 and 58 are coupled to each other. A magnetic closed circuit is formed by the yokes 51 and 58 to constitute a non-reciprocal circuit element. (For example, see Patent Document 1)

However, in the conventional non-reciprocal circuit element, since the second yoke 58 is integrated by the insert molding with the resin case 57, the molding die becomes complicated, the molding process is troublesome, and the productivity is low. Bad and expensive.
In addition, since each of the upper electrodes of the capacitors 62 and 63 is connected to the port portions 54a and 55a of the first and second center conductors 54 and 55, the first and second center conductors 54, From the port portions 54a and 55a side of 55, it is necessary to provide individual terminal portions for connection to an external device.

JP 2001-24406 A

In the conventional non-reciprocal circuit element, since the second yoke 58 is integrated by insert molding with the resin case 57, the molding die becomes complicated, the molding process is troublesome, and the productivity is poor. There is a problem of high costs.
In addition, since each of the upper electrodes of the capacitors 62 and 63 is connected to the port portions 54a and 55a of the first and second center conductors 54 and 55, the first and second center conductors 54, From the port portions 54a and 55a side of 55, it is necessary to provide individual terminal portions for connection to external devices, and there is a problem that the assemblability is poor and the cost is increased.

  Accordingly, an object of the present invention is to provide an inexpensive nonreciprocal circuit device with high productivity.

  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 A second yoke that forms a magnetic closed circuit with the first yoke, and a plurality of capacitors connected to the center conductor and a bottom plate of the second yoke, The electrode is placed on and connected to the bottom plate of the second yoke, and the second electrode facing the first electrode of the capacitor is made of a strip-shaped insulating material and has a plurality of terminals. An insulating base provided with a member is placed; Child member was connected to each to the central conductor and the second electrode.

  As a second solution, the insulating base is formed of a synthetic resin molded product, and the terminal member is connected to a terminal portion made of a metal plate embedded in the insulating base, and the terminal portion. It is formed by a conductive pattern provided on the outer surface of the insulating base, and either the terminal portion or the conductive pattern is connected to the second electrode, and either the terminal portion or the conductive pattern The other was configured to be connected to the central conductor.

As a third solution, the second yoke is provided with a relief hole, and the terminal portion is located in the relief hole and exposed from the second yoke.
As a fourth solution, the terminal portion exposed from the second yoke is configured to be flush with the lower surface of the bottom plate.

Further, as a fifth solution, the upper surface of the insulating base placed on the capacitor and the upper surface of the ferrite member are configured to have substantially the same height.
Further, as a sixth solution, the bottom plate of the second yoke is provided with a convex portion that supports the lower surface of the insulating base.

  As a seventh solution, the second yoke has the bottom plate and a side plate bent from the bottom plate. An insulating resist portion and an insulating resist are provided on the bottom plate or the outer surface of the side plate. A terminal located in the portion is provided, and the terminal is formed in a terminal region surrounded by the insulating resist portion.

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, A second yoke that forms a magnetic closed circuit with the yoke, and a plurality of capacitors connected to the center conductor and the bottom plate of the second yoke, and the first electrode of the capacitor is on the bottom plate of the second yoke An insulating substrate made of a strip-shaped insulating material and provided with a plurality of terminal members is placed on the second electrode facing and connected to the capacitor first electrode, and the terminal member Are connected to the second electrode and the central conductor.
In other words, since the insulating base provided with the terminal member is placed on the capacitor, the conventional configuration in which the second yoke is insert-molded into the resin case is unnecessary, and the productivity is high and the cost is low. At the same time, since the second electrode of the capacitor and the central conductor are connected to the terminal member provided on the insulating base, a product with good productivity and low cost can be obtained.

  The insulating base is formed of a synthetic resin molded product, and the terminal member is a terminal portion made of a metal plate embedded in the insulating base, and a conductive member connected to the terminal portion and provided on the outer surface of the insulating base. One of the terminal portion and the conductive pattern is connected to the second electrode, and one of the terminal portion and the conductive pattern is connected to the center conductor, so that the second electrode and the center In addition to being easily connected to the terminal member to the conductor, the insulating base can be molded with a simple mold, and an inexpensive product can be obtained.

  Further, the second yoke is provided with a relief hole, and the terminal portion is located in the relief hole and exposed from the second yoke, so that it is easy to connect to an external device.

  Further, since the terminal portion exposed from the second yoke is flush with the bottom surface of the bottom plate, it is possible to obtain a terminal portion that can be easily mounted on the surface.

  Further, since the upper surface of the insulating substrate placed on the capacitor and the upper surface of the ferrite member are made substantially the same height, it is possible to easily connect the central conductor to the terminal member.

  Moreover, since the convex part which supports the lower surface of an insulating base was provided in the bottom plate of the 2nd yoke, the thing with the stable support of an insulating base is obtained.

  The second yoke has a bottom plate and a side plate bent from the bottom plate. The bottom plate or the outer surface of the side plate is provided with an insulating resist portion and a terminal located in the insulating resist portion. Since the second yoke for forming the terminal is not necessary, the productivity is improved, and the terminal region is formed by the insulating resist portion. For this reason, solder does not adhere to the outside of the terminal region, and a soldered product can be obtained.

  Referring to the non-reciprocal circuit device of the present invention, FIG. 1 is a cross-sectional view of the main part of the non-reciprocal circuit device of the present invention, and FIG. 2 relates to the non-reciprocal circuit device of the present invention. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2, FIG. 4 is a perspective view of the nonreciprocal circuit device of the present invention, with the second yoke turned upside down, and FIG. FIG. 6 is a developed view of a central conductor according to the non-reciprocal circuit device of the present invention. FIG.

  Next, the configuration when the nonreciprocal circuit device of the present invention is applied to an isolator will be described with reference to FIGS. 1 to 6. A first yoke made of a U-shaped or box-shaped magnetic plate (iron plate or the like). 1 has a square (rectangular) upper plate 1a and a side plate 1b bent downward from a side of the upper plate 1a.

  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 formed of a U-shaped or box-shaped magnetic plate (iron plate or the like) includes a rectangular bottom plate 3a, a side plate 3b bent upward from a side of the bottom plate 3a, and a bottom plate 3a or side plate. There are escape holes 3c formed in 3b and trapezoidal convex portions 3d provided on the bottom plate 3a so as to protrude inward.

Further, as shown in FIG. 4, an insulating resist portion 9 made of an insulating film is provided on the outer surface of the bottom plate 3a of the second yoke 3, and a terminal 3e located in the insulating resist portion 9 is provided. The terminal 3 e is formed in a terminal region surrounded by the insulating resist portion 9.
In the second yoke 3, the side plate 3b is coupled to the side plate 1b of the first yoke 1 in a state where the bottom plate 3a is disposed facing the upper plate 1a, thereby forming a magnetic closed circuit. .

  In addition, although the terminal 3e in the said Example demonstrated the thing provided in the bottom plate 3a, the terminal 3e may be provided in the side board 3b, or the thing provided ranging over the bottom board 3a and the side board 3b.

  A flat ferrite member 4 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. As shown in FIG. 6, the first, second, and third center conductors 5, 6, and 7 made of a thin conductive plate such as copper are formed by punching a metal plate and have a square ground located at the center. The first, second, and third port portions 5a are formed on the ends of the first, second, and third central conductors 5, 6, and 7, respectively. 6a and 7a are provided.

  In these first, second, and third center conductors 5, 6, and 7, first, the grounding portion 8 is disposed on the lower surface of the ferrite member 4, and in this state, the first, second, third The center conductors 5, 6, and 7 are bent along the side surface and the upper surface of the ferrite member 4.

At this time, the first, second, and third central conductors 5, 6, and 7 are provided at intervals of 120 degrees on different surfaces in the vertical direction with a dielectric (not shown) interposed therebetween, and are arranged in the vertical direction. As shown in FIG. 2, the first and second port portions 5a and 6a are arranged on one long side of the ferrite member 4, and the third port portion 7a is in a state of being arranged on the other long side.
When the ferrite member 4 is placed on the bottom plate 3a of the second yoke 3, the ground portion 8 comes into contact with the bottom plate 3a and is grounded.

The chip-type first, second, and third capacitors C1, C2, and C3 are respectively opposed to the first electrode 11a provided on the insulator 10 and the first electrode 11a across the insulator 10. A second electrode 11b is provided.
The first, second, and third capacitors C1, C2, and C3 are placed on the bottom plate 3a of the second yoke 3 in a state of being disposed on the outer periphery of the ferrite member 4, and the first electrode 11a is The bottom plate 3a is soldered and grounded.

  The chip-type resistor R has a pair of electrodes 12a and 12b provided on opposite end surfaces, and the resistor R is disposed in the vicinity of the third capacitor C3 and is connected to one electrode 12a. Is soldered to the bottom plate 3a and grounded, and the other electrode 12a is insulated from the bottom plate 3a.

  A terminal member 16 is provided on a strip-shaped insulating base 15 made of a synthetic resin molding or the like. The terminal member 16 includes two terminals made of metal plates embedded on both sides of the insulating base 15 on the lower side. A portion 16a, two conductive patterns 16b provided on the upper surface side of the insulating base 15 so as to face the terminal portion 16a, and a connection conductor 16c composed of a through hole for connecting the terminal portion 16a and the conductive pattern 16b, etc. It is formed with.

  In addition, the terminal member 16 of the said Example may provide the terminal part 16a in the upper surface side in the insulating base | substrate 15, and provided the conductive pattern 16b in the lower surface side of the insulating base | substrate 15. FIG.

The insulating base 15 is placed on the first and second capacitors C1 and C2, and each of the two terminal portions 16a is soldered to the second electrode 11b of the first and second capacitors C1 and C2. Thus, the conductive pattern 16b becomes conductive with the terminal portion 16a through the connection conductor 16c.
At this time, the lower surface of the insulating base 15 is in contact with and supported by the convex portion 3d, and the terminal portion 16a protrudes outward in or through the escape hole 3c. 3 and is exposed from the second yoke 3, and the terminal portion 16b is flush with the lower surface of the bottom plate 3a.

  In this embodiment, there is a step between the upper surface of the insulating substrate 15 and the upper surface of the ferrite member 4, but the upper surface of the insulating substrate 15 and the upper surface of the ferrite member 4 are high from the bottom plate 3a. The lengths may be substantially the same so that they are on the same plane.

The port portion 5a of the first center conductor 5 is connected to one conductive pattern 16b by soldering, and is conducted to the second electrode 11b of the first capacitor C1. The port portion 6a is connected to the other conductive pattern 16b by solder and is conducted to the second electrode 11b of the second capacitor C2.
The port portion 7a of the third central conductor 7 is connected to the second electrode 11b of the third capacitor C3 and the electrode 12b of the resistor R by soldering.

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 terminal 3e provided on the bottom plate 3a of the second yoke 3 and the terminal portion 16a of the terminal member 16 provided on the insulating base 15 are placed on the circuit board of the external device. It is designed to be soldered to the wiring pattern.

  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 principal part sectional drawing concerning the nonreciprocal circuit device of this invention. The top view which shows the state which concerns on the nonreciprocal circuit element of this invention, and removed the 1st yoke and the magnet. Sectional drawing in the 3-3 line of FIG. The perspective view of the state which turned on the 2nd yoke according to the nonreciprocal circuit element of this invention. The perspective view of the insulation base | substrate which concerns on the nonreciprocal circuit device of this invention. The expanded view of the center conductor which concerns on the nonreciprocal circuit device of this invention. The disassembled perspective view of the conventional nonreciprocal circuit device.

Explanation of symbols

1: First yoke 1a: Upper plate 1b: Side plate 2: Magnet 3: Second yoke 3a: Bottom plate 3b: Side plate 3c: Escape hole 3d: Convex portion 3e: Terminal 4: Ferrite member 5: First central conductor 5a: first port portion 6: second center conductor 6a: second port portion 7: third center conductor 7a: third port portion 8: ground portion 9: insulating resist portion C1: first capacitor C2: second capacitor C3: third capacitor 10: insulator 11a: first electrode 11b: second electrode R: resistor 12a: electrode 12b: electrode 15: insulating base 16: terminal member 16a: terminal portion 16b: Conductive pattern 16c: Connection conductor

Claims (7)

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. A second yoke, and a plurality of capacitors connected to the central conductor and a bottom plate of the second yoke, wherein the first electrode of the capacitor is placed on the bottom plate of the second yoke And an insulating substrate made of a strip-shaped insulating material and provided with a plurality of terminal members is mounted on the second electrode facing the first electrode of the capacitor. Is connected to the second electrode and the central conductor. Nonreciprocal circuit device, characterized in that the. The insulating base is formed of a synthetic resin molded product, and the terminal member is connected to the terminal portion made of a metal plate embedded in the insulating base and provided on the outer surface of the insulating base. One of the terminal portion and the conductive pattern is connected to the second electrode, and the other of the terminal portion and the conductive pattern is connected to the center conductor. The non-reciprocal circuit device according to claim 1. 3. The nonreciprocal circuit device according to claim 2, wherein a relief hole is provided in the second yoke, and the terminal portion is located in the relief hole and exposed from the second yoke. 4. The nonreciprocal circuit device according to claim 3, wherein the terminal portion exposed from the second yoke is flush with a lower surface of the bottom plate. 5. The nonreciprocal circuit device according to claim 1, wherein an upper surface of the insulating base placed on the capacitor and an upper surface of the ferrite member have substantially the same height. 6. The nonreciprocal circuit device according to claim 1, wherein the bottom plate of the second yoke is provided with a convex portion that supports the lower surface of the insulating base. 7. The second yoke has the bottom plate and a side plate bent from the bottom plate, and an outer surface of the bottom plate or the side plate is provided with an insulating resist portion and a terminal located in the insulating resist portion. The nonreciprocal circuit device according to claim 1, wherein the terminal is formed in a terminal region surrounded by the insulating resist portion.

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