JP2003101310A - Non-reversible circuit element and communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-reversible circuit element and a communication device which are made stable in electric properties and reduced in manufacturing cost. SOLUTION: A non-reversible circuit element is composed of a permanent magnet, a center electrode assembly 13 consisting of a ferrite 20 to which a DC magnetic field is applied by the permanent magnet and center electrodes 21 and 22 wound on the ferrite 20, and a metal case which houses the permanent magnet and the center electrode assembly 13. The surface 20a of the ferrite 20 is composed of at least two sides 20c and 20d which are opposed to one another. The sides 20c and 20d form an angle θ with one another, and θ is an acute angle. The center electrode 21 arranged on the surface 20a of the ferrite 20 crosses the side 20c of the ferrite 20 at right angles, and the center electrode 22 arranged on the surface 20a crosses the side 20d of the ferrite 20 at right angles.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a non-reciprocal circuit device and a communication device.

[0002]

2. Description of the Related Art Conventionally, as a two-port isolator (non-reciprocal circuit device), one disclosed in Japanese Patent Laid-Open No. 11-205016 has been known. As shown in FIG.
The isolator 210 is composed of a permanent magnet 213, a center electrode assembly 220, an element mounting substrate 214, a resistance element R, a matching capacitor element C, an upper metal case 211, a lower metal case 212 and the like. The center electrode assembly 220 has a center electrode 221, which is formed by screen printing.
An electrode for connection is provided on the side surface of the ferrite 225 obtained by stacking the ferrite sheets having 222 formed thereon, press-bonding and firing. The ferrite 225 has a square or rectangular shape in plan view. Each center electrode 221, 22
The second end, the electrode portion of the resistance element R, and the electrode portion of the matching capacitor element C are electrically connected to the electrode pattern formed on the element mounting substrate 214.

A center electrode assembly described in Japanese Patent Laid-Open No. 52-134349 is known as a type different from the above-mentioned center electrode assembly 220. As shown in FIG. 15, the center electrode assembly 230 includes a ferrite 225 having a square shape in plan view, and center electrodes 221 and 222 having windings wound around the ferrite 225. In such a center electrode assembly 230, ideally, the intersecting angle between the center electrode 221 and the center electrode 222 is preferably 90 degrees. However, from the viewpoint of electrical characteristics, the intersection angle θ between the center electrode 221 and the center electrode 222 may be an acute angle or an obtuse angle. Specifically, since the center electrode 221 and the center electrode 222 three-dimensionally intersect the surface of the ferrite 225 (in other words, the center electrode 222 is wound around the ferrite 225, and the center electrode 221 is wound thereon). And the center electrode 222 has asymmetry such that the distance from the ferrite 225 is different. Therefore, the crossing angle θ at which the alignment can be obtained deviates from 90 degrees. In order to obtain such a crossing angle θ, the winding tracks of the windings are manipulated in the winding process to move the center electrodes 221 and 222 and the ferrite 22.
The angle α formed by the four sides 225a of 5 is an acute angle or an obtuse angle.

[0004]

However, if the winding track of the winding is slightly tilted from a line perpendicular to the side 225a of the ferrite 225, the position of the winding track tends to vary in the winding operation. Therefore, the center electrode 22
When the electrodes 1, 222 are slightly inclined from the line perpendicular to the side 225a of the ferrite 225, the center electrodes 221,
Compared with the case where 22 is wound in a winding orbit perpendicular to the side 225a, the crossing angle θ of the center electrodes 221 and 222 tends to fluctuate and is difficult to stabilize. Therefore, the center electrode 22
A step of adjusting the intersection angle θ of the center electrodes 221 and 222 after winding the coils 1 and 222 is necessary, which is one of the causes of the increase in production cost.

Therefore, an object of the present invention is to provide a non-reciprocal circuit device and a communication device whose electrical characteristics are stabilized and whose cost is reduced.

[0006]

In order to achieve the above object, the nonreciprocal circuit device according to the present invention comprises: (a) a permanent magnet; and (b) a direct-current magnetic field is applied by the permanent magnet to be parallel to each other. The first pair of sides facing each other and the second pair of parallel sides facing each other
A ferrite having a pair of sides, a first main surface having a non-perpendicular angle between the first set of sides and the second set of sides, and a second main surface facing the first main surface. (C) a first center electrode made of a conductive wire, wound around the ferrite, and (d)
A second center electrode made of a conductive wire wound around the ferrite; (e) the permanent magnet, the ferrite, and the first
A metal case accommodating the center electrode and the second center electrode, and (f) the first center electrode arranged on the first main surface of the ferrite is orthogonal to each of the sides of the first set, Further, the second center electrode arranged on the first main surface of the ferrite is orthogonal to each of the sides of the second set. The shape of the ferrite in plan view is preferably a parallelogram or a rhombus.

With the above structure, the first center electrode arranged on the first main surface of the ferrite is orthogonal to each of the sides of the first set, and the second center electrode arranged on the first main surface of the ferrite. Are orthogonal to each of the sides of the second set, the first center electrode and the second center electrode are wound around the ferrite in the most stable state, and the electrical characteristics are stable. Further, since the first center electrode and the second center electrode are orthogonal to the sides of the first set and the second set, respectively, workability of winding the first center electrode and the second center electrode around the ferrite is improved. .

Further, it is preferable that the ferrite is arranged vertically to the wiring substrate, and the vertical dimension of the ferrite is smaller than the horizontal dimension of the ferrite. As a result, the height of the ferrite is lowered, and the height of the nonreciprocal circuit device is reduced.

Further, the communication device according to the present invention is provided with the nonreciprocal circuit element, so that the electrical characteristics are improved and the size is reduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a nonreciprocal circuit device and a communication device according to the present invention will be described below with reference to the accompanying drawings. In each embodiment, a lumped-constant type isolator is described as an example of the non-reciprocal circuit element, the same parts and the same parts are denoted by the same reference numerals, and duplicated description will be omitted.

[First Embodiment, FIGS. 1 to 10] FIG. 1 is an exploded perspective view of an embodiment of a non-reciprocal circuit device according to the present invention. As shown in FIG. 1, an isolator (non-reciprocal circuit element) 1 includes a heat-resistant film 8, a metal case 5, two permanent magnets 9, a center electrode assembly 13, a wiring board 30, and matching capacitor elements C1 to C4. The resistor element R, the copper plate 50, the element mounting substrate 40 and the like are included.

The metal case 5 has an upper wall and four side walls. The metal case 5 is formed by punching and bending a metal plate. A rectangular window portion 5a is formed at the center of the upper surface of the metal case 5.

The heat-resistant film 8 is rectangular in plan view and has a size slightly smaller than the window 5a of the metal case 5. An adhesive is applied to the lower surface of the heat resistant film 8.

The two permanent magnets 9 each have a substantially rectangular shape, and are arranged so that a DC magnetic field is formed from one permanent magnet 9 to the other permanent magnet 9 as will be described later (see FIG. 5).

The center electrode assembly 13 comprises a microwave ferrite 20, two center electrodes (first center electrode) 21, a center electrode (second center electrode) 22, and the like. Center electrode 21,
22 is wound around the front surface (first main surface) 20a and the back surface (second main surface) 20b of the ferrite 20 by intersecting two conducting wires.

The conductive wires used for the center electrodes 21 and 22 are
The conductor is covered with an insulator having high heat resistance, leaving both ends. This conductor has a diameter of 0.05 mm to 0.1
A 5 mm copper wire, a silver wire, a gold wire, or the like is used. The wire diameter may be increased depending on the electrical characteristics of the isolator 1. Further, the conductor wire is not limited to a wire material having a round cross-sectional shape, and may be, for example, a ribbon-shaped wire having a rectangular cross-sectional shape.

As shown in FIG. 2, the ferrite 20 has a laterally long diamond shape in plan view (the opposing sides 20c and 20c have the same length, and the opposing sides 20c and 20c are parallel to each other).
Has the shape of. The angle θ of the corners of the ferrite 20 (the left and right corners of the ferrite 20 in FIG. 2) is set to an acute angle (non-right angle). At this time, the angle θ ′ of the other corner of the ferrite 20 (upper and lower corners of the ferrite 20 in FIG. 2) is an obtuse angle (non-right angle). The angle θ greatly affects the isolation characteristic of the isolator 1 and is set in a range that satisfies the required characteristic of the isolator 1 (generally, the isolation characteristic is 20 dB or more). In the present embodiment, the range of the intersection angle θ that satisfies the required characteristic of the isolation characteristic is set to the range of 75 degrees or more and less than 90 degrees (see FIG. 8). However, ferrite 20
The angle θ of the left and right corners of the
May be set to an acute angle. Since the shape of the ferrite 20 is a symmetrical rhombus, the processing cost of the ferrite 20 and the winding cost of the center electrodes 21 and 22 are low.

The center electrode 22 is the surface 2 of the ferrite 20.
0a and the back surface 20b are wound so as to be in close contact with each other. At this time, the center electrode 22 arranged on the surface 20a of the ferrite 20 is orthogonal to the side 20d of the ferrite 20. Similarly, the center electrode 21 is the surface 2 of the ferrite 20.
0a and the outer surface of the center electrode 22 arranged on the back surface 20b. At this time, the surface 2 of the ferrite 20
The center electrode 21 arranged at 0a is orthogonal to the side 20c of the ferrite 20. There is a gap between the center electrode 21 and the front surface 20a and back surface 20b of the ferrite 20 by the wire diameter of the center electrode 22. Surface 2 of ferrite 20
Crossing angle θ between the center electrode 21 and the center electrode 22 at 0a
Is a corner portion of the ferrite 20 (in FIG. 2, the ferrite 20
The angle θ of the left and right corners of is the same. The input / output characteristic impedance of the isolator 1 (typical value: 50
The adjustment of (Ω) is performed by increasing or decreasing the number of turns of the center electrodes 21 and 22.

The center electrode assembly 13 includes a center electrode 21.
The intersection angle θ between the center electrode 22 and the center electrode 22 is determined by the angle θ of the corner of the ferrite 20. Therefore, in the device for winding the center electrodes 21 and 22 around the ferrite 20, the center electrodes 21 and 22 arranged on the surface 20 a of the ferrite 20 are arranged in the ferrite 20 regardless of the intersection angle θ between the center electrode 21 and the center electrode 22. It only has to be wound so as to be orthogonal to the sides 20c and 20d. Therefore, the center electrodes 21, 22 and the ferrite 20
Since the work time for adjusting the intersection angle of the sides 20c and 20d can be shortened, the productivity of the isolator 1 is improved. Further, since the center electrodes 21, 22 are arranged so as to be orthogonal to the sides 20c, 20d of the ferrite 20, the center electrodes 21, 22 are wound around the ferrite 20 in the most stable state. Therefore, the electrical characteristics of the isolator 1 are less likely to change.

When the center electrodes 21, 22 are closely attached and wound around the ferrite 20, the back surface 20 of the ferrite 20 is
Since the center electrodes 21 and 22 arranged in b are displaced by the winding pitch (diameter of one center electrode 21 or 22),
The center electrode 21 arranged on the back surface 20b of the ferrite 20.
The intersection angle θ1 between the center electrode 22 and the center electrode 22 is different from the intersection angle θ between the center electrode 21 and the center electrode 22 arranged on the surface 20a.

The wiring substrate 30 has input / output electrode patterns 31, 32 and a ground electrode pattern 33 formed on the upper surface 30a of a substantially rectangular substrate. Input / output electrode pattern 3
1, 32 and the ground electrode pattern 33 are the wiring substrate 3
As shown in FIG. 3, it extends to the lower surface 30b through the side surface of 0.

As shown in FIG. 1, the matching capacitor elements C1 to C4 have connecting capacitor electrodes on the upper and lower surfaces. The thickness dimensions of the matching capacitor elements C1 to C4 are set to be substantially the same.

The resistance element R has a substantially rectangular shape, and has connection electrodes on its left and right sides. The thickness dimension of the resistance element R is larger than the thickness dimension of the matching capacitor elements C1 to C4, and the ground electrode pattern 45 of the element mounting substrate 40.
Of the electrode and the total thickness of the solder for soldering to the ground electrode pattern 45 are set larger.

The element mounting substrate 40 has a substantially rectangular shape, and has a ground electrode pattern 45 and an input / output electrode pattern 43,
44 is formed on the upper surface thereof.

The above-mentioned components are assembled as follows. The matching capacitor elements C1 to C4 and the copper plate 50 are placed on the upper surface of the element mounting substrate 40 and mounted by a method such as soldering. At this time, the electrode on the lower surface of the matching capacitor element C3 is provided in the input / output electrode pattern 43
A matching capacitor element C4 is provided on the input / output electrode pattern 44.
Of the lower surface of the matching capacitor elements C1 and C2 and the copper plate 50 on the ground electrode pattern 45.
Are electrically connected by a method such as soldering. The resistance element R is placed on the non-electrode pattern portion 49 of the element mounting substrate 40. That is, the ground electrode pattern 45 and the resistance element R are in an electrically non-contact state.

Next, the wiring board 30 is placed on the elements C1 to C4, R and the copper plate 50 and electrically connected to the elements C1 to C4, R and the copper plate 50 by a method such as soldering. And fix it. At this time, the upper surfaces of the matching capacitor elements C1 and C3 are the input / output electrode patterns 31 formed on the lower surface 30b of the wiring substrate 30, and the upper surfaces of the matching capacitor elements C2 and C4 are the input / output electrode patterns 32. , Are electrically connected by soldering or the like. Further, the copper plate 50 is electrically connected to the ground electrode pattern 33 formed on the lower surface 30b of the wiring substrate 30. Further, one of the connecting electrodes of the resistance element R is the input / output electrode pattern 31 formed on the lower surface 30b of the wiring substrate 30, and the other of the connecting electrodes is the lower surface 3
0b are electrically connected to the input / output electrode patterns 32 (see FIG. 3).

Next, as shown in FIG. 4, a wiring board 30 is provided.
An adhesive resin (thermosetting or ultraviolet curing) 51 is injected between the substrate and the element mounting substrate 40 by using a dispenser or the like to be solidified. The adhesive resin 51 is formed at three locations on the peripheral edge of the wiring substrate 30. As a result, the wiring substrate 3
0 and the element mounting substrate 40 are firmly bonded by the adhesive resin 51. That is, the wiring board 30 and the element mounting board 40 hold the elements C1 to C4, R and the copper plate 50 arranged therebetween.

Next, the center electrode assembly 13 is placed and fixed on the upper surface 30a of the wiring substrate 30. At this time, the ferrite 20 is fixed so as to be perpendicular to the upper surface 30a of the wiring substrate 30 using the adhesive resin 51 (see FIG. 2). Then, one end of each of the center electrodes 21 and 22 is electrically connected to the ground electrode pattern 33 of the wiring substrate 30 and the other end thereof is electrically connected to the input / output electrode patterns 31 and 32 of the wiring substrate 30 by a method such as soldering. To be done. This allows
The center electrode assembly 13 is fixed to the wiring board 30.

Next, as shown in FIG. 5, two permanent magnets 9 are arranged and fixed on the inner wall of the metal case 5. And
As shown in FIG. 6, the heat-resistant film 8 is attached so as to straddle the two permanent magnets 9 so as not to come into contact with the inside of the window 5a of the metal case 5. This prevents dust and metal debris from entering the isolator 1.

Next, the metal case 5 is attached to the element mounting substrate 40.
And the ground electrode pattern 4 of the device mounting substrate 40
5 is joined by soldering. At this time, the center electrode assembly 13 is arranged between the two permanent magnets 9 so that the surface 20a of the ferrite 20 is substantially perpendicular to the direction of the DC magnetic field (see FIG. 5). Then, the DC magnetic field formed by the two permanent magnets 9 is applied to the ferrite 20 of the center electrode assembly 13. The straight line L indicates the center of the two permanent magnets 9.

In this way, the isolator 1 as shown in FIG. 6 is formed. FIG. 7 shows the isolator 1 shown in FIG.
2 is an electrical equivalent circuit diagram of FIG.

Next, the isolator 1 is connected to about 2.5 GH.
The electrical characteristics when operated at z were investigated. 8 is a graph showing isolation characteristics of the isolator 1 shown in FIG. 6, FIG. 9 is a graph showing insertion loss of the isolator 1 shown in FIG. 6, and FIG. 10 is reflection of the isolator 1 shown in FIG. It is a graph which shows a characteristic. As the isolator 1 whose electric characteristics were examined, as the ferrite 20, a ferrite having a size of 0.5 mm × 0.5 mm × 0.3 mm and a saturation magnetization (4πMs) of about 80 mT to 90 mT was used. A copper wire having a diameter of 0.05 mm is used as the center electrodes 21 and 22, and the center electrodes 21 and 22 are made of ferrite 2
I wound 2 turns into 0. The size of the isolator 1 is 2.5m
The size is m × 3.2 mm × 1.8 mm.

The above isolator 1 includes the ferrite 20
Since the center electrodes 21 and 22 arranged on the surface 20a of the ferrite are wound so as to be orthogonal to the sides 20c and 20d of the ferrite 20, the work of winding the center electrodes 21 and 22 around the ferrite 20 can be facilitated. The productivity of the isolator 1 can be improved. Further, since the center electrodes 21, 22 arranged on the surface 20a of the ferrite 20 are orthogonal to the sides 20c, 20d of the ferrite 20, winding deviation of the center electrodes 21, 22 after winding is less likely to occur, and the isolator 1 The electrical characteristics of can be stabilized.

[Second Embodiment, FIG. 11] The second embodiment shows an isolator 1 in which the shape of the ferrite 20 of the center electrode assembly 13 shown in the first embodiment is modified.
As shown in FIG. 11, the shape of the ferrite 20 in plan view was a parallelogram, which is asymmetrical to the left and right. Similar to the first embodiment, the center electrodes 21, 22 arranged on the surface 20a of the ferrite 20 have the sides 20c, 20 of the ferrite 20.
It is orthogonal to d.

The isolator 1 including the center electrode assembly 13 has the same effects as those of the first embodiment. Further, since the sides 20c and 20d of the ferrite 20 are made different in length from each other to be asymmetrical, the center electrodes 21 and 22 are
Center electrode 21 and center electrode 22 with the same number of turns of
The characteristic impedance of the isolator 1 can be adjusted by changing the length of the conducting wire of the winding part of the. Such a center electrode assembly 13 is particularly effective when the number of turns of the center electrodes 21 and 22 cannot be increased due to the size limitation of the isolator 1.

[Third Embodiment, FIG. 12] The third embodiment shows an isolator 1 in which the shape of the ferrite 20 of the center electrode assembly 13 shown in the first embodiment is modified.
As shown in FIG. 12, the shape of the ferrite 20 in plan view is a modified hexagon in which sides 20e are newly provided above and below the rhombus. The center electrodes 21 and 22 arranged on the surface 20a of the ferrite 20 are orthogonal to the sides 20c and 20d of the ferrite 20, as in the first embodiment. The sides 20e may be newly provided at the upper and lower corners of the parallelogram-shaped ferrite 20 shown in the second embodiment.

The isolator 1 having the center electrode assembly 13 has the same effects as those of the first and second embodiments. Furthermore, since the lower side 20e of the ferrite 20 is substantially horizontal to the wiring board 30, the center electrode assembly 13 can be mounted on the upper surface 30a of the wiring board 30 with good stability. Also, although not shown,
Even when the center electrode assembly 13 is laid on the wiring board 30 so that the surface 20a of the ferrite 20 and the upper surface 30a of the wiring board 30 are arranged substantially parallel to each other, the wiring board 30
Since the area occupied by the upper surface 30a of the isolator 1 can be reduced, the isolator 1 can be downsized.

[Fourth Embodiment, FIG. 13] A fourth embodiment will be described by taking a mobile phone as an example of a communication device according to the present invention.

FIG. 13 is an electric circuit block diagram of the RF portion of the mobile phone 120. In FIG. 13, 122 is an antenna element, 123 is a duplexer, 124 and 126 are transmission side power amplifiers, 125 is a transmission side interstage band pass filter, 127 is a transmission side mixer, 128 is a reception side low noise amplifier, and 129 is reception. Bandpass filter for side stages, 13
Reference numeral 0 is a receiving side mixer, 131 is an isolator, 132 is a voltage controlled oscillator (VCO), and 133 is a local band pass filter.

Here, as the isolator 131, the isolator 1 of the first to third embodiments can be used. By mounting this isolator 1, a low-cost and highly reliable mobile phone can be realized at low cost.

[Other Embodiments] The present invention is not limited to the above embodiments, but can be modified into various configurations within the scope of the gist of the present invention. For example, in the isolator 1 shown in the first to third embodiments, the shape of the permanent magnet 9 may be, for example, a circular shape, a triangular shape with rounded corners, etc., in addition to the rectangular shape. . Further, the number of permanent magnets 9 is not limited to two and may be one. In addition to the isolator, the present invention can be applied to various non-reciprocal circuit devices such as circulators. Further, if the shape of the ferrite 20 in plan view has two pairs of sides 20c and 20d that face each other in parallel,
It is not limited to diamonds, parallelograms and hexagons,
For example, an octagon or any other polygonal shape may be used as long as it has a shape other than a square and a rectangle.

Further, it goes without saying that the communication device shown in the fourth embodiment is not limited to a mobile phone and can be applied to other communication devices.

[0043]

As is apparent from the above description, according to the present invention, in the nonreciprocal circuit device, the first center electrode arranged on the first main surface of the ferrite is orthogonal to the sides of the first set, And,
The second center electrode arranged on the first main surface of the ferrite is the second
Since they are orthogonal to the sides of the set, the first center electrode and the second center electrode can be wound around the ferrite in the most stable state, and the electrical characteristics can be stabilized.

Further, since the first center electrode and the second center electrode are orthogonal to the sides of the first set and the second set, the workability of winding the first center electrode and the second center electrode around the ferrite is improved. Can be made. Therefore, it is possible to obtain an inexpensive non-reciprocal circuit device and communication device with stable electrical characteristics.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a non-reciprocal circuit device according to the present invention.

FIG. 2 is a plan view of the center electrode assembly shown in FIG.

FIG. 3 is a perspective view of the wiring board shown in FIG. 1 viewed from a lower side surface.

FIG. 4 is a plan view of the nonreciprocal circuit device shown in FIG. 1 after partial assembly.

5 is a top view for explaining the positional relationship between the permanent magnet and the center electrode assembly of the nonreciprocal circuit device shown in FIG.

6 is an external perspective view of the non-reciprocal circuit device shown in FIG. 1 after completion of assembly.

7 is an electrical equivalent circuit diagram of the nonreciprocal circuit device shown in FIG.

8 is a graph showing isolation characteristics of the nonreciprocal circuit device shown in FIG.

9 is a graph showing insertion loss of the nonreciprocal circuit device shown in FIG.

10 is a graph showing reflection characteristics of the nonreciprocal circuit device shown in FIG.

FIG. 11 is a plan view of a center electrode assembly showing a second embodiment of the non-reciprocal circuit device according to the present invention.

FIG. 12 is a plan view of a center electrode assembly showing a third embodiment of the non-reciprocal circuit device according to the present invention.

FIG. 13 is a block diagram showing an embodiment of a communication device according to the present invention.

FIG. 14 is an exploded perspective view of a conventional non-reciprocal circuit device.

FIG. 15 is a plan view of a center electrode assembly of another conventional non-reciprocal circuit device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Isolator (non-reciprocal circuit element) 5 ... Metal case 9 ... Permanent magnet 13 ... Center electrode assembly 20 ... Microwave ferrite 20a ... Front surface (first main surface) 20b ... Back surface (second main surface) 20c ... Ferrite Side 20d of the first set ... Side 21 of the second set of ferrite 21 ... Center electrode (first center electrode) 22 ... Center electrode (second center electrode) 30 ... Wiring substrate θ ... First arranged on first main surface Crossing angle of 1 center electrode and 2nd center electrode

Claims (5)

[Claims] 1. A permanent magnet, a first set of sides that face each other in parallel when a DC magnetic field is applied by the permanent magnet, a second set of sides that face each other in parallel, a first set of sides and the first set of sides. A ferrite having a first main surface whose angle formed by two pairs of sides is non-perpendicular, and a second main surface facing the first main surface, and a first wire formed of a conductive wire wound around the ferrite. A center electrode; a second center electrode made of a conductive wire wound around the ferrite; a metal case containing the permanent magnet, the ferrite, the first center electrode, and the second center electrode; The first center electrode arranged on the first main surface of the ferrite is orthogonal to each of the sides of the first set, and the second center electrode arranged on the first main surface of the ferrite is the second center electrode. A non-reciprocal circuit characterized by being orthogonal to each of the edges of the set element. 2. The nonreciprocal circuit device according to claim 1, wherein the shape of the ferrite in plan view is a parallelogram. 3. The nonreciprocal circuit device according to claim 1, wherein the shape of the ferrite in plan view is a rhombus. 4. The non-woven fabric according to claim 1, wherein the ferrite is arranged perpendicularly to the wiring substrate, and the vertical dimension of the ferrite is smaller than the horizontal dimension of the ferrite. Reversible circuit element. 5. A communication device comprising the non-reciprocal circuit device according to claim 1.