JP3779532B2 - Electronic circuit unit with circulator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic circuit unit including a circulator suitable for use in an electronic circuit unit such as an antenna duplexer.
[0002]
[Prior art]
An electronic circuit unit having a conventional circulator will be described with reference to FIGS. 11 and 12. The circulator S2 is arranged at an interval of 120 degrees, and a part of the circulator S2 is arranged so as to cross each other. The magnetic substrate is disposed so as to cover the outside of the magnet 53 located above the dielectric substrate 52 attached with the magnet 53, the magnet 53 disposed above and below the intersection of the central conductor 51, and the ferrite (not shown). And a second yoke 55 made of a magnetic material that is joined to the first yoke 54 and covers the outside of the ferrite located below.
[0003]
The circulator S2 has a closed magnetic circuit formed by the first and second yokes 54 and 55, and input / output terminals 51a provided on the three central conductors 51 have first and second terminals. The circulator S <b> 2 is formed as a single product with a configuration projecting outward from the sides of the yokes 54 and 55.
[0004]
A circuit board 56 such as an antenna duplexer is provided with a hole 56a and a plurality of conductive patterns 57 around the hole 56a.
On the circuit board 56 provided with the conductive pattern 57, various electrical components (not shown) are mounted to form a desired electronic circuit.
[0005]
The single-piece circulator S2 is placed in the hole 56a of the circuit board 56, the terminal 51a of the center conductor 51 and the ground electrode (not shown) are placed on the conductive pattern 57, and these are soldered. Thus, an electronic circuit unit including a conventional circulator is formed.
[0006]
[Problems to be solved by the invention]
In an electronic circuit unit equipped with a conventional circulator, the circulator S2 is configured as a single product, and this single product circulator S2 is soldered to the circuit board 56, so that the productivity is low and the space factor is low. There is a problem that it is bad and large.
[0007]
Therefore, an object of the present invention is to provide an electronic circuit unit including a circulator that is small and has good productivity.
[0008]
[Means for Solving the Problems]
As a first means for solving the above-mentioned problem, a circuit board on which a plurality of dielectric substrates are stacked and an electrical component is provided to form a desired electronic circuit, and the circuit board The first, second, and third center conductors that are partially crossed in the vertical direction, the magnets disposed above and below the crossing portions of these center conductors, ferrite, and the outside of the magnets are covered. A circulator having a first yoke and a second yoke covering the outside of the ferrite, wherein the first, second, and third central conductors are provided on each of the plurality of dielectric substrates. In addition, the upper and lower portions formed on the circuit board so as to surround the concave portion are provided with a concave portion for housing the ferrite at a lower portion of the circuit board on which the central conductor is located. Penetrate A magnetic material is provided in the number of through holes, and a magnetic path between the first and second yokes arranged above and below the circuit board is formed by the magnetic material so as to cover the magnet and the ferrite. Thus, a magnetic closed circuit was configured.
[0009]
As a second solution, the magnetic material is formed by filling the through hole with a paste containing a magnetic component.
As a third solution, at least one of the first and second yokes has a cylindrical side wall, and the dielectric substrate faces the end of the side wall and surrounds the recess. An annular magnetic pattern joined to the magnetic material provided on the same circumference was provided .
As a fourth solution, the magnetic pattern is provided on each of the dielectric substrates located between the first and second yokes.
[0010]
As a fifth solution, the ferrite is disposed in the concave portion, the magnet is disposed on an upper surface of the circuit board, and the first yoke having the cylindrical side wall is disposed on the magnet. The plate-like second yoke is arranged so as to cover the outside, and is arranged so as to cover the outside of the ferrite and close the recess.
[0011]
As a sixth solution, a conductive pattern is provided on the surface of the first dielectric substrate disposed on the uppermost surface of the circuit board, and is provided below the first dielectric substrate. The disposed dielectric substrate is provided with the first, second and third center conductors, and one end of each of the first, second and third center conductors is provided on the circuit board. The conductive pattern is connected to the conductive pattern by a through-hole conductor filled in the hole.
[0012]
As a seventh solution, the other ends of the first, second, and third central conductors are filled in holes provided in the circuit board at positions closer to the center than the annular magnetic pattern. Grounded via the through-hole conductor formed.
As an eighth solution, each of the through-hole conductors connected to the other ends of the first, second and third center conductors is connected to one good conductor.
[0013]
As a ninth solution, a circulator capacitor formed by printing is provided on the upper surface of the circuit board at a position outside the first yoke, and the capacitor is connected to the first yoke. After installation, the trimming is possible.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view of an essential part of an electronic circuit unit provided with the circulator of the present invention, and FIG. 2 is an illustration of the electronic circuit unit provided with the circulator of the present invention. FIG. 3 is an explanatory perspective view showing a configuration of a circuit board in an electronic circuit unit including a circulator according to the present invention.
[0015]
4 relates to an electronic circuit unit equipped with the circulator of the present invention, FIG. 3 is a sectional view of the electronic circuit unit taken along line 4-4 in FIG. 3, and FIG. 5 relates to an electronic circuit unit equipped with the circulator of the present invention. 3 is a cross-sectional view of the electronic circuit unit at the position of line 5-5 in FIG. 3. FIG. 6 is a sectional view of the electronic circuit unit at the position of line 6-6 in FIG. FIG. 7 relates to an electronic circuit unit equipped with the circulator of the present invention, FIG. 8 is a sectional view of the electronic circuit unit taken along line 7-7 in FIG. 3, and FIG. 8 relates to an electronic circuit unit equipped with the circulator of the present invention. It is an equivalent circuit diagram of a circulator.
[0016]
Next, the configuration of the electronic circuit unit including the circulator of the present invention will be described with reference to FIGS. 1 to 8. The circuit board 1 used in the electronic circuit unit such as an antenna duplexer is composed of a plurality of ceramic green sheets. The dielectric substrate 2 is laminated and configured.
The circuit board 1 includes a conductive pattern having a desired shape between the top surface of the first-layer dielectric substrate 2, the bottom surface of the dielectric substrate 2 exposed from the bottom, and the dielectric substrate 2. 3 is provided, and the conductive patterns 3 are electrically connected by through-hole conductors (described later).
[0017]
The upper surface of the circuit board 1 is provided with printed electrical components (not shown) such as capacitors 4a, 4b, and 4c formed by printing, and chip-shaped electronic circuits. Is formed.
The capacitors 4a, 4b, and 4c include an electrode 3a formed of the conductive pattern 3 provided on the upper surface of the circuit board 1, and a ground pattern 3b provided in the circuit board 1 with the dielectric substrate 2 interposed therebetween. It consists of
The capacitors 4a, 4b, 4c may be chip type.
[0018]
Next, the configuration of the circulator S1 according to the present invention will be described. The circulator S1 includes first, second, and third center conductors 5, 6, and 7 that are made of copper foil patterns or the like partially intersecting in the vertical direction. The magnet 8 and the ferrite 9 arranged above and below the crossing portion, the first and second yokes 10 and 11 made of a magnetic material covering the outside of the magnet 8 and the ferrite 9, and the first and second yokes 10, 11 and a magnetic material 12 provided between the magnetic material 11 and the annular magnetic pattern 13.
[0019]
The first central conductor 5 is provided by printing or the like on the upper surface of the dielectric substrate 2 located in the second layer from the upper surface of the circuit board 1, and the second central conductor 6 is provided on the circuit board 1. The third central conductor 7 is provided on the upper surface of the dielectric substrate 2 located on the third layer from the upper surface by printing or the like. Further, the third central conductor 7 is formed on the dielectric substrate 2 located on the fourth layer from the upper surface of the circuit substrate 1. It is provided on the upper surface by printing or the like.
[0020]
The plurality of dielectric substrates 2 provided with the first, second, and third center conductors 5, 6, and 7 are stacked in a state of being overlapped with each other, and the first, second, and second substrates are stacked. The three central conductors 5, 6 and 7 are arranged with an interval of 120 degrees from each other in a state where the central portions cross each other.
That is, these central conductors 5, 6, and 7 are formed on the dielectric substrate 2 positioned below the first-layer dielectric substrate 2 on which the conductive pattern 3 is formed.
[0021]
The first dielectric substrate 2 of the circuit board 1 has a lower portion facing the first, second, and third central conductors 5, 6, and 7, with the upper portion being the first to fourth layers. In a state of being closed by the dielectric substrate 2 of the eye, it has a recess 1a provided with its lower surface open, and a shoulder 1b made of a notch provided around the recess 1a. A ferrite 9 is arranged in 1a, and a magnet 8 is attached to the upper surface of the circuit board 1 with an adhesive or the like.
[0022]
That is, the magnet 8 and the ferrite 9 are arranged so as to sandwich the intersecting portion of the first, second, and third center conductors 5, 6, and 7 from above and below.
As shown in FIGS. 4 to 6, the dielectric substrate 2 located on the upper end of each of the first, second and third center conductors 5, 6 and 7 is provided with a hole 1 c. These holes 1c are filled with through-hole conductors 14 made of a conductive paste such as silver, and one ends of the first, second and third central conductors 5, 6 and 7 are connected to the conductive pattern 3. At the same time, it is connected to the electrodes 3a of the capacitors 4a, 4b and 4c for the circulator S1.
[0023]
As shown in FIGS. 4 to 6, a hole 1 d is provided in the dielectric substrate 2 positioned below the other end of each of the first, second, and third center conductors 5, 6, and 7. These holes 1d are filled with through-hole conductors 15 made of a conductive paste such as silver and connected to the other ends of the first, second and third center conductors 5, 6 and 7, respectively. The through-hole conductor 15 is led out in a state where it is exposed on the lower surface of the shoulder 1b.
[0024]
Further, as shown in FIGS. 4 to 7, the circuit board 1 has a plurality of (about 30 holes with a pitch of 0.4 mm) penetrating vertically on the same circumference surrounding the recess 1a. And the conductive pattern 3 connected to one end of the first, second, and third central conductors 5, 6, and 7 is formed on the dielectric substrate 2 located in the first layer from the top. In the portion thus formed, there is no through hole 1 e in order to insulate the conductive pattern 3.
[0025]
Further, as shown in FIGS. 1 to 7, the dielectric substrate 2 constituting the circuit board 1 includes a dielectric located on the upper surface and the shoulder 1b of the first-layer dielectric substrate 2 located on the top. An annular magnetic pattern 13 is provided on the lower surface of the substrate 2 and between the dielectric substrates 2 so as to coincide with the through holes 1e on the same circumference surrounding the recess 1a.
The magnetic pattern 13 is formed by printing a paste containing copper and nickel on the dielectric substrate 2 and then baking the paste. The magnetic pattern 13 is a first pattern in which the conductive pattern 3 is formed. In the dielectric substrate 2 of the layer and the second, third, and fourth dielectric substrates 2 on which the first, second, and third central conductors 5, 6, and 7 are formed In order to avoid contact with the conductive pattern 3, and the first, second, and third center conductors 5, 6, and 7, respectively, a notch portion 13a that is partially cut is provided.
[0026]
And each through-hole 1e is filled with the magnetic material 12 which consists of a paste containing magnetic powders, such as copper and nickel, and these magnetic materials 12 are in the state which contacted each magnetic pattern 13 in this state. The magnetic path is formed by the annular magnetic pattern 13 and the magnetic material 12 by bonding.
These magnetic patterns 13 are outside the other ends of the first, second and third center conductors 5, 6 and 7, that is, the first, second and third center conductors 5, 6, and 7. In the state where the other end is located closer to the center side than the annular magnetic pattern 13, it is connected to the through-hole conductor 15.
[0027]
The first yoke 10 includes an upper wall 10a, a cylindrical side wall 10b bent at a right angle from an end of the upper wall 10a, and three notches provided at the end of the side wall 10b. The first yoke 10 covers the outside of the magnet 8 disposed on the upper surface of the circuit board 1 and is mounted on the circuit board 1 with the notch 10c positioned on the conductive pattern 3. Is placed.
The entire periphery of the end of the side wall 10 b excluding the notch 10 c is soldered 18 to the annular magnetic pattern 13, and the first yoke 10 is attached to the circuit board 1.
That is, the magnetic pattern 13 and the magnetic material 12 are formed along the end of the side wall 10b of the first yoke 10, and when the first yoke 10 is attached, the end of the side wall 10b 13 and the magnetic material 12 are in contact with each other.
[0028]
The second yoke 11 is made of a disk-shaped magnetic plate, and a single good conductor 19 made of a metal plate having good conductivity such as copper is disposed on the upper surface of the second yoke 11. ing.
The second yoke 11 covers the outside of the ferrite 9 and is disposed on the shoulder 1b so as to close the open portion of the recess 1a of the circuit board 1. The second yoke 11 is soldered to the magnetic pattern 13 and the through-hole conductor 15. By being attached, it is attached to the circuit board 1 together with the good conductor 19.
The solder 20 is also attached to a ground pattern (not shown) provided on the surface of the lower end 1b so that the good conductor 19 and the through-hole conductor 15 are grounded.
[0029]
When the first and second yokes 10 and 11 are attached, a magnetic path is formed between the first and second yokes 10 and 11 by the magnetic pattern 13 and the magnetic material 12, and as a result, the first The first and second yokes 10 and 11, the magnetic pattern 13, and the magnetic material 12 constitute a magnetic closed circuit.
When the second yoke 11 is attached, one good conductor 19 contacts each of the through-hole conductors 15 connected to the other ends of the first, second, and third center conductors 5, 6, and 7. Thus, the other ends of the first, second, and third center conductors 5, 6, and 7 are grounded well.
[0030]
With such a configuration, the circulator S1 is formed, and this circulator S1 is inserted into one end side of each of the first, second, and third central conductors 5, 6, and 7, as shown in the equivalent circuit diagram of FIG. An output terminal 21 is provided, the other end of each is grounded, and the grounded capacitor 4a is connected between the first, second and third center conductors 5, 6, 7 and the input / output terminal 21. 4b and 4c are connected.
[0031]
An electronic circuit unit incorporating such a circulator S1 is checked for electrical performance. In particular, in checking the performance of the circulator S1, the first and second yokes 10 and 11 are incorporated. In this state, a performance check is performed, and in order to obtain a desired performance, a part of the electrode 3a of the capacitors 4a, 4b, 4c is cut and trimmed.
[0032]
Note that the first yoke 10 may be a square or more polygonal rectangular tube.
In the above embodiment, the magnetic material 12 has been described as filling the through hole 1e with a paste containing a magnetic component, but this magnetic material extends from the end of the side wall 10b of the first yoke 10. A magnetic path may be formed by forming a plurality of protrusions and inserting the protrusions into the through holes 1e.
In this case, a more durable circuit board 1 can be formed by filling the through hole 1e with a solder paste and soldering the protrusion and the magnetic pattern 13 with the solder paste.
[0033]
Further, the magnetic pattern 13 and the central conductors 5, 6 and 7 are made of the same material by using an alloy of silver having a small electric resistance and a large magnetic resistance and a medium having a small magnetic resistance and a large electric resistance. And can be manufactured with good productivity.
The magnetic pattern 13 may be made of a copper base plated with permalloy (iron, nickel alloy) or other alloy.
The magnetic material 12 may be a permalloy paste or other alloy paste.
[0034]
9 and 10 show an embodiment in which the circulator S1 is applied to an isolator (non-reciprocal circuit element). In this embodiment, a capacitor 4c is provided via a resistor 22 formed on the upper surface of the circuit board 1. The other components are the same as those in the above-described embodiment, and thus the same parts are denoted by the same reference numerals and the description thereof is omitted here.
Note that the resistor 22 may be a sheet-like one provided with a resistor on an insulating film, a chip-type one, or a print-type one obtained by printing a resistor.
[0035]
As shown in FIGS. 9 and 10, in such an isolator, the capacitor 4a includes an inductor 23 formed of a conductive pattern 3 existing between the first central conductor 5 and the capacitor 4a, and a capacitor 4a. The capacitor 4b is formed between the second central conductor 6 and the capacitor 4b and is connected to the inductor 24 formed with the conductive pattern 3 existing between the output terminal 21 and the capacitor 24b. Connected to the inductor 25 formed of the conductive pattern 3 existing between the capacitor 4b and the input / output terminal 21 and grounded at one end, the capacitor 4c is connected to the third central conductor. 7 is connected to a resistor 22 connected to 7.
[0036]
In such an isolator, after the first and second yokes 10 and 11 are covered, the capacitors 4a, 4c and 4c, the resistor 22, and the inductor 23.24.25.26 are trimmed and adjusted to provide isolation. The characteristics and frequency characteristics can be adjusted.
Therefore, with such a configuration, more accurate adjustment is possible as compared with the case where the yoke is covered after adjustment.
[0037]
【The invention's effect】
In the electronic circuit unit provided with the circulator of the present invention, the circulator S1 is formed by using a part of the circuit board 1 and can be manufactured in the manufacturing process of the electronic circuit on the circuit board 1. Compared with this, it is possible to provide an electronic circuit unit having good productivity and good space factor and having a small circulator.
[0038]
A plurality of through holes 1 e penetrating up and down the circuit board 1 are provided with a magnetic material, and the first and second yokes 10 arranged above and below the circuit board 1 so as to cover the magnet 8 and the ferrite 9. , 11 is formed by a magnetic material 12 to form a magnetic closed circuit, so that the first and second yokes 10 and 11 can be made small, and the magnetic material 12 enables a magnetic closed circuit. Can be provided.
[0039]
Further, since the magnetic material 12 is formed by filling the through-hole 1e with a paste containing magnetic powder, this structure is simple and a product with good productivity can be obtained.
[0040]
Further, at least one of the first and second yokes 10 and 11 has a cylindrical side wall 10b, and the dielectric substrate 2 has an annular shape facing the end of the side wall 10b and joined to the magnetic material 12. Since the magnetic pattern 13 is provided, a magnetic path between the first and second yokes 10 and 11 is ensured, and a good magnetic closed circuit can be obtained.
[0041]
Further, since the magnetic pattern 13 is provided on each of the dielectric substrates 2 positioned between the first and second yokes 10 and 11, the magnetic path between the first and second yokes 10 and 11 becomes more reliable, A better magnetic closed circuit is obtained.
[0042]
A ferrite 9 is disposed in the recess 1a, a magnet 8 is disposed on the upper surface of the circuit board 1, and a first yoke 10 having a cylindrical side wall 10b is disposed so as to cover the outside of the magnet 8. Since the plate-like second yoke 11 covers the outside of the ferrite 11 and is disposed so as to close the recess 1a, the shapes of the first and second yokes 10 and 11 are simple, small, and productive. A good electronic circuit unit with a small circulator can be provided.
[0043]
In addition, a conductive pattern 3 is provided on the surface of the first-layer dielectric substrate 2 disposed on the uppermost surface of the circuit board 1, and the dielectric substrate disposed below the first-layer dielectric substrate 2. 2 are provided with first, second and third center conductors 5, 6 and 7, and one ends of the first, second and third center conductors 5, 6 and 7 are connected to the circuit board 1. Since the through hole conductor 14 filled in the provided hole 1c is connected to the conductive pattern 3, the input / output terminals 21 of the circulator S1 can be concentrated on the upper surface, wiring becomes easy, and a product with good productivity can be obtained. It is done.
[0044]
The other end of each of the first, second and third center conductors 5, 6 and 7 is filled in a hole 1 d provided in the circuit board 1 at a position closer to the center than the annular magnetic pattern 13. Since it is grounded through the through-hole conductor 15, the ground side of the first, second, and third center conductors 5, 6, 7 does not cross the annular magnetic pattern 13, and accordingly, the cutout portion of the magnetic pattern 13 As a result, it is possible to reduce the number 16a and to obtain a ground that can be grounded in a small radial space.
[0045]
In addition, each of the through-hole conductors 15 connected to the other ends of the first, second, and third center conductors 5, 6, and 7 is connected to one good conductor 19, so that each has a small electric resistance. The thing which can be grounded in a state is obtained.
[0046]
On the upper surface of the circuit board 1, capacitors 4a, 4b, and 4c for the circulator S1 formed by printing are provided at positions outside the first yoke 10, and the capacitors 4a, 4b, and 4c are the first ones. Since the trimming is possible after the yoke 10 is attached, the capacitors 4a, 4b, and 4c can be formed in the manufacturing process of the circuit board 1, and the trimming is possible after the electronic circuit unit is completed. Unit can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view of an essential part of an electronic circuit unit including a circulator according to the present invention.
FIG. 2 is an exploded perspective view of a main part of an electronic circuit unit including a circulator according to the present invention.
FIG. 3 is an explanatory perspective view showing a configuration of a circuit board in an electronic circuit unit including a circulator according to the present invention.
4 is a cross-sectional view of the electronic circuit unit taken along the line 4-4 in FIG. 3, according to the electronic circuit unit including the circulator of the present invention.
5 is a cross-sectional view of the electronic circuit unit at the position of line 5-5 in FIG. 3, according to the electronic circuit unit including the circulator of the present invention.
6 is a cross-sectional view of the electronic circuit unit taken along the line 6-6 in FIG. 3, according to the electronic circuit unit including the circulator of the present invention.
7 is a cross-sectional view of the electronic circuit unit taken along the line 7-7 in FIG. 3, according to the electronic circuit unit including the circulator of the present invention.
FIG. 8 is an equivalent circuit diagram of a circulator according to an electronic circuit unit including the circulator of the present invention.
FIG. 9 is a perspective view of an essential part showing an embodiment in which a circulator is applied to an isolator in an electronic circuit unit including a circulator according to the present invention.
FIG. 10 is an equivalent circuit diagram of an isolator in an embodiment in which the circulator is applied to an isolator according to an electronic circuit unit including the circulator of the present invention.
FIG. 11 is an exploded perspective view of a circulator according to an electronic circuit unit including a conventional circulator.
FIG. 12 is an exploded perspective view of an electronic circuit unit including a conventional circulator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Circuit board 1a Recess 1b Shoulder 1c Hole 1d Hole 1e Through-hole 2 Dielectric substrate 3 Conductive pattern 3a Electrode 3b Ground pattern 4a Capacitor 4b Capacitor 4c Capacitor S1 Circulator 5 First center conductor 6 Second center conductor 7 Third Center conductor 8 magnet 9 ferrite 10 first yoke 10a upper wall 10b side wall 10c notch 11 second yoke 12 magnetic material 13 magnetic pattern 13a notch 14 through-hole conductor 15 through-hole conductor 18 solder 19 good conductor 20 Solder 21 Input / Output Terminal 22 Resistor 23 Inductor 24 Inductor 25 Inductor 26 Inductor

Claims (9)

A circuit board on which a plurality of dielectric substrates are stacked and an electrical component is provided to form a desired electronic circuit, and a first board that is provided on the circuit board and partially crosses in the vertical direction. Second and third center conductors, magnets and ferrites arranged above and below the intersections of these center conductors, a first yoke that covers the outside of the magnets, and a second that covers the outside of the ferrites And the first, second, and third central conductors are provided on each of the plurality of dielectric substrates, and these are laminated to form the center. In the lower part of the circuit board where the conductor is located, a recess for storing the ferrite is provided, and a magnetic material is provided in a plurality of through-holes penetrating vertically formed in the circuit board so as to surround the recess , Front with the magnet A circulator characterized in that a magnetic closed circuit is formed by forming a magnetic path between the first and second yokes arranged above and below the circuit board with the magnetic material so as to cover the ferrite. Electronic circuit unit.   2. The electronic circuit unit having a circulator according to claim 1, wherein the magnetic material is formed by filling the through hole with a paste containing magnetic powder. At least one of the first and second yokes has a cylindrical side wall, and the dielectric substrate is provided on the same circumference facing the end of the side wall and surrounding the recess. 3. An electronic circuit unit comprising a circulator according to claim 1, wherein an annular magnetic pattern joined to a magnetic material is provided.   4. The electronic circuit unit having a circulator according to claim 3, wherein the magnetic pattern is provided on each of the dielectric substrates positioned between the first and second yokes.   The ferrite is disposed in the recess, the magnet is disposed on an upper surface of the circuit board, the first yoke having the cylindrical side wall is disposed so as to cover the outside of the magnet, 5. The electronic circuit unit having a circulator according to claim 3, wherein the second yoke having a shape covers the outside of the ferrite and is disposed so as to close the recess.   A conductive pattern is provided on the surface of the first dielectric substrate disposed on the uppermost surface of the circuit substrate, and the dielectric substrate disposed below the first dielectric substrate is disposed on the dielectric substrate. The first, second, and third center conductors are provided, and one end of each of the first, second, and third center conductors is a through-hole conductor filled in a hole provided in the circuit board. An electronic circuit unit comprising the circulator according to claim 1, wherein the electronic circuit unit is connected to the conductive pattern.   The other ends of the first, second, and third center conductors are grounded via through-hole conductors filled in holes provided in the circuit board at positions closer to the center than the annular magnetic pattern. An electronic circuit unit comprising the circulator according to claim 6.   The circulator according to claim 7, wherein each of the through-hole conductors connected to the other end of the first, second, and third central conductors is connected to one double-way electric body. Electronic circuit unit.   A circulator capacitor formed by printing at a position outside the first yoke is provided on the upper surface of the circuit board so that the capacitor can be trimmed after the first yoke is attached. An electronic circuit unit comprising the circulator according to any one of claims 5 to 8.

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