JP2003243906A - Nonreciprocal circuit element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonreciprocal circuit element at a low cost with excellent productivity. <P>SOLUTION: A first electrode part 22 of a capacitor C1 in the nonreciprocal circuit element of this invention is connected to a bottom plate 3a while being placed on the bottom plate 3a, a side plate 3c is formed with a recessed part 3d or a projection 3e to prevent a second electrode part 23 from being in contact with a side plate 23. Thus, the second electrode part 23 of the capacitor C1 avoids contact with the side plate 3c by the recessed part 3d or the projection 3e, resulting in eliminating the need for an insulating layer having been conventionally required and the nonreciprocal circuit element with ease of processing, excellent productivity at a low cost can be obtained. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-reciprocal circuit device such as a circulator or an isolator applied to an antenna duplexer or the like.

[0002]

2. Description of the Related Art A conventional non-reciprocal circuit device will be described with reference to FIG. 6, and a U-shaped yoke 51 made of a magnetic material.
Has a bottom plate 51a made of a flat plate and a side plate 51b bent upward from the bottom plate 51a. An insulating layer 52 made of an insulating material is formed on the inside of the side plate 51b by printing, coating or the like.

The chip-type capacitor 53 includes an insulator 54.
And the first and second surfaces provided on both sides of the insulator 54 so as to face each other.
It is composed of the second electrode portions 55 and 56. In this capacitor 53, the first electrode portion 55 is placed on the bottom plate 51a, and the first electrode portion 55 is soldered to the bottom plate 51a in a state where the side portion 53a is in contact with the insulating layer 52 and positioned. Connected. At this time, the insulating layer 52 is interposed between the second electrode portion 56 and the side plate 51b so that the second electrode portion 56 does not contact the side plate 51b.

The central conductor 57 has a terminal portion 57a provided at one end thereof, and the terminal portion 57a is soldered and connected to the second electrode portion 56, and at the same time, the terminal portion 57 is formed.
The end portion of a is projected to the outside of the yoke 51.

[0005]

In the conventional non-reciprocal circuit device, since the insulating layer 52 is provided in order to prevent the second electrode portion 56 of the capacitor 53 from contacting the side plate 51b, the forming work is troublesome. However, there is a problem that productivity is poor and cost is high.

Therefore, an object of the present invention is to provide an inexpensive non-reciprocal circuit device with high productivity.

[0007]

As a first solving means for solving the above-mentioned problems, a flat ferrite member,
First, second, and third central conductors that are located on the ferrite member and that are provided on different surfaces in the vertical direction with the dielectric material sandwiched between them, and that partially intersect in the vertical direction, and are arranged on this central conductor. A magnet, a first yoke arranged so as to cover the magnet, a second yoke arranged on the lower surface side of the ferrite member and forming a magnetic closed circuit with the first yoke, and an insulation A chip-type capacitor having first and second electrode portions facing each other with the body sandwiched therebetween, wherein the second yoke has a bottom plate made of a flat plate and a side plate bent upward from the bottom plate. And the capacitor is the first
Is connected to the bottom plate in a state where the electrode part is placed on the bottom plate, the terminal part of the center conductor is connected to the second electrode part, and the side plate has a recess or a protrusion. A portion is provided to prevent the second electrode portion from coming into contact with the side plate.

As a second solving means, the side plate is provided with the recess at a position facing the second electrode portion, and when the side part of the capacitor comes into contact with the side plate,
The concave portion serves as an escape portion so that the second electrode portion does not come into contact with the side plate.

As a third solving means, the side plate is provided with the convex portion at a position facing the insulator,
When the insulator located on the side portion of the capacitor comes into contact with the convex portion, the convex portion separates the second electrode portion from the side plate, and the second electrode portion contacts the side plate. It is configured not to.

[0010]

1 is an exploded perspective view of a non-reciprocal circuit device according to a first embodiment of the present invention, and FIG. 2 is a non-reciprocal circuit device according to the present invention. FIG. 3 is a cross-sectional view of a main part of the device according to the first embodiment. FIG. 3 is an enlarged cross-sectional view of the main part showing a second yoke and a capacitor according to the first embodiment of the nonreciprocal circuit device of the present invention. FIG. 5 is an enlarged cross-sectional view of an essential part showing a second yoke and a capacitor according to a second embodiment of the nonreciprocal circuit device of the present invention, and FIG. 5 is an equivalent circuit diagram in which the nonreciprocal circuit device of the present invention is applied to a circulator. .

Next, the structure of the first embodiment of the non-reciprocal circuit device of the present invention will be described with reference to FIGS. 1 to 3, in which the first yoke 1 formed of a U-shaped magnetic plate (iron plate or the like) is used. An upper plate 1a formed of a rectangular flat plate and a pair of facing side plates 1b bent downward from opposite sides of the upper plate 1a.

Positioning member 1 made of synthetic resin molding
1 is composed of two members separated from each other, or one member, and the positioning member 11 is attached to the inner surface of the first yoke 1. Then, the positioning member 11 is
It is formed integrally with the first yoke 1 by molding.

The disk-shaped magnet 2 is inserted and arranged inside the positioning member 11, and the outer peripheral surface of the magnet 2 is supported by the positioning member 11 and positioned.

The second yoke 3 made of a U-shaped magnetic plate (iron plate or the like) faces a bottom plate 3a made of a rectangular flat plate and a relatively long face bent upward from the opposite side of the bottom plate 3a. A pair of first side plates 3b and this first side plate 3
A pair of relatively short opposing second side plates 3c bent upward from opposing sides of the bottom plate 3a orthogonal to b, and a plurality of recesses 3d provided inside the second side plate 3c.
Have and.

The recess 3d is formed as a recess or a through hole. And, this second yoke 3 is
The pair of first side plates 3b is joined to the pair of side plates 1b of the first yoke 1 to form a magnetic closed circuit.

YIG (Yttrium iron ga)
The flat ferrite member 4 made of, for example, rnet) is mounted on the bottom plate 3a of the second yoke 3 in a mounted state.

The chip type capacitor C1 includes an insulator 21 made of a plate-shaped ceramic or the like, and the insulator 21.
Of the first and second electrode portions 22 and 23 made of silver or the like provided on the two flat outer surfaces facing each other, and
Capacitance is formed between the first and second electrode portions 22 and 23 facing each other.

Then, three chip-type capacitors C1
The first electrode portion 22 is placed on the bottom plate 3a of the second yoke 3 and the side portion 24 is positioned by abutting against the second side plate 3c. Is the bottom plate 3a
The capacitor C1 is soldered to the second yoke 3 and is grounded to the second yoke 3.

At this time, the second electrode portions 23 of the three capacitors C1 face the concave portions 3d, and when the side portions 24 of the capacitors C1 abut the side plate 3c, the concave portions 3d are formed.
Serves as an escape portion so that the second electrode portion does not contact the side plate 3c.

The first, second, and third central conductors 5, 6, 7 made of a conductive plate such as copper are provided with a pair of bent portions 5a, 6a, 7a provided at both ends, and one bent portion. Connection parts 5b, 6 provided at the ends of 5a, 6a, 7a
b, 7b and terminal portions 5c, 6c, 7c that are formed by bending at the ends of the other bent portions 5a, 6a, 7a.

The first, second and third central conductors 5,
6 and 7 are arranged on different planes in the vertical direction with a dielectric 8 made of an insulating material sandwiched therebetween, and are arranged at intervals of 120 degrees, and a part of them intersect in the vertical direction. Has become. Moreover, these first, second, and third central conductors 5, 6, and 7 are placed on the ferrite member 4 via the dielectric 8.

At this time, the first, second and third central conductors 5,
Each of the terminal portions 5c, 6c, 7c of 6, 7 is soldered and electrically connected to the second electrode portion 23 of the chip-type capacitor C1, and the terminal portions 5c, 6c, 7c are also connected.
The end of c is projected outward from the second yoke 3. The connecting portions 5b, 6b, 7b are soldered to the bottom plate 3a of the second yoke 3 and are electrically connected in the grounded state.

The first, second and third central conductors 5,
The magnets 2 positioned on the first yoke 1 are located on the magnets 6 and 7.
Are arranged, and in this state, the side plates 1b and 3b of the first and second yokes 1 and 3 are coupled to each other to form the first and second yokes 1 and 1.
When the magnet 2, the ferrite member 4 and the like are sandwiched between the three, a non-reciprocal circuit element including a circulator or an isolator is formed.

The non-reciprocal circuit device having such a structure is mounted on a circuit board having a conductive pattern, which is not shown here. When the non-reciprocal circuit device is mounted, the terminal portions 5c, 6c, 7c of the first, second, and third central conductors 5, 6, 7 are soldered to the conductive pattern for wiring, and Second yoke 3
Bottom plate 3a is soldered to a conductive pattern for grounding.

Next, the structure of the second embodiment of the nonreciprocal circuit device of the present invention will be described with reference to FIG.
The second side plate 3c of is provided with a convex portion 3e protruding inward, and the insulator 21 located on the side portion 24 of the capacitor C1 contacts the convex portion 3e, whereby the convex portion 3e causes The second electrode portion 23 is separated from the side plate 3c, and the second electrode portion 2
The side plate 3c is prevented from coming into contact with the side plate 3c.

Since the other structure is the same as that of the first embodiment, the same parts are designated by the same reference numerals and the description thereof is omitted here.

FIG. 5 is an equivalent circuit diagram in which the non-reciprocal circuit device of the present invention is applied to a circulator, which is connected to one end side of each of the first, second, and third central conductors 5, 6, 7. Terminal portions 5c, 6c, 7c which are output terminals are provided, and the connection portions 5b, 6b, 7b on the other end side thereof are grounded, and the first, second and third central conductors 5,
A grounded chip type capacitor C1 is connected to the terminal portions 5c, 6c and 7c of 6, 7 respectively.

[0028]

The nonreciprocal circuit device of the present invention is provided with a flat plate-shaped ferrite member, and is disposed on the ferrite member on different planes in the vertical direction with the dielectric material sandwiched therebetween. Crossing first, second, and third central conductors, a magnet arranged on the central conductor, a first yoke arranged so as to cover the magnet, and arranged on the lower surface side of the ferrite member, A second yoke that forms a magnetic closed circuit with the first yoke;
And the first and second yokes facing each other with the insulator interposed therebetween.
A chip-type capacitor having an electrode part of
Has a bottom plate made of a flat plate and a side plate bent upward from the bottom plate, and the capacitor is connected to the bottom plate with the first electrode portion placed on the bottom plate, The terminal portion of the central conductor is connected to the second electrode portion, and the side plate is provided with a concave portion or a convex portion so that the second electrode portion does not contact the side plate. With such a configuration, the second electrode portion of the capacitor has no contact with the side plate due to the concave portion or the convex portion, and therefore,
The conventional insulating layer is no longer required, and it is easy to process, has good productivity, and is inexpensive.

Further, the side plate is provided with a concave portion at a position facing the second electrode portion, and when the side portion of the capacitor comes into contact with the side plate, the concave portion becomes an escape portion and the second electrode portion is formed. Since it does not come into contact with the side plate, it is easy to process, has good productivity, and is inexpensive.

Further, the side plate is provided with a convex portion at a position facing the insulator, and when the insulator located on the side portion of the capacitor comes into contact with the convex portion, the convex portion causes the second electrode portion to move. Since the second electrode portion is separated from the side plate so that the second electrode portion does not contact the side plate, it is easy to process, has good productivity, and is inexpensive.

[Brief description of drawings]

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

FIG. 2 is a sectional view of an essential part of a non-reciprocal circuit device according to a first embodiment of the present invention.

FIG. 3 relates to a first embodiment of a nonreciprocal circuit device of the present invention,
The expanded sectional view of the principal part which shows the 2nd yoke and a capacitor.

FIG. 4 relates to a second embodiment of the nonreciprocal circuit device of the present invention,
The expanded sectional view of the principal part which shows the 2nd yoke and a capacitor.

FIG. 5 is an equivalent circuit diagram in which the nonreciprocal circuit device of the present invention is applied to a circulator.

FIG. 6 is an enlarged cross-sectional view of a main part of a yoke related to a conventional non-reciprocal circuit device.

[Explanation of symbols]

1 first yoke 1a Upper plate 1b Side plate 11 Positioning member 2 magnets 3 second yoke 3a Bottom plate 3b First side plate 3c Second side plate 3d recess 3e convex part 4 Ferrite material 5 First central conductor 5a Bent section 5b connection 5c terminal part 6 Second center conductor 6a Bent section 6b connection 6c terminal part 7 Third central conductor 7a Bent part 7b connection 7c terminal part 8 Dielectric C1 chip capacitor 21 Insulator 22 First electrode part 23 Second electrode part 24 sides

Claims (3)

[Claims] 1. A flat plate-shaped ferrite member, and first, second, and second parts which are located on the ferrite member and which are provided on different planes in the vertical direction with a dielectric material sandwiched therebetween and which partially intersect each other in the vertical direction. 3 central conductor, a magnet arranged on the central conductor, a first yoke arranged so as to cover the magnet, and a first yoke arranged on the lower surface side of the ferrite member.
And a chip-type capacitor having first and second electrode portions that face each other with an insulator interposed therebetween, and the second yoke is a flat plate. And a side plate bent upward from the bottom plate, and the capacitor is connected to the bottom plate with the first electrode portion placed on the bottom plate, and The terminal portion of the central conductor is connected to the second electrode portion, and the side plate is provided with a concave portion or a convex portion so that the second electrode portion does not come into contact with the side plate. Non-reciprocal circuit device. 2. The side plate is provided with the recess at a position facing the second electrode portion, and when the side part of the capacitor comes into contact with the side plate, the recess serves as an escape part.
The nonreciprocal circuit device according to claim 1, wherein the second electrode portion is prevented from coming into contact with the side plate. 3. The protrusion is provided on the side plate at a position facing the insulator, and when the insulator located on the side of the capacitor comes into contact with the protrusion, the protrusion is formed by the protrusion. The nonreciprocal circuit device according to claim 1, wherein the second electrode portion is separated from the side plate so that the second electrode portion does not contact the side plate.