JP2002118403A - Nonreversible circuit element and communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonreversible circuit element which has a construction by which the peripheral surface of a permanent magnet and the inner surface of the side walls of a metal case are not in contact with each other and which can be manufactured at a low cost, and to provide a communication device. SOLUTION: A nonreversible circuit element 1 is roughly provided with integrally molded resin case 3 and lower case 4, a central electrode assembly 13, an upper case 8, a permanent magnet 9, a resin spacer 7, a resistor element R, capacitor elements C1-C3 for matching and the like. Contact protection parts 6 for the resin case 3 are provided between the inner surface of the side walls 8b of the upper case 8 and the peripheral surface 9b of the permanent magnet 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In general, a lumped constant type isolator (non-reciprocal circuit element) employed in a mobile communication device such as a mobile phone has a function of passing a signal only in a transmission direction and preventing transmission in a reverse direction. have. Further, in recent mobile communication devices, there has been a strong demand for smaller size, lighter weight, and lower cost because of the application, and accordingly, there has been a demand for smaller, lighter, and lower cost isolators. Have been.

FIG. 19 shows an example of such an isolator. This isolator 61 incorporates a resin case 63 on a lower case 64 made of a magnetic metal, accommodates a center electrode assembly 73 and a matching capacitor element C and the like in the resin case 63, and is made of a magnetic metal. The upper case 68 is attached. The center electrode assembly 73 includes a microwave ferrite 80.
In which center electrodes 81 to 83 are arranged. A permanent magnet 69 is attached to the inner surface of the upper case 68, and a DC magnetic field is applied to the center electrode assembly 73 by the permanent magnet 69. Permanent magnet 69 and center electrode assembly 73
A resin spacer 67 is provided therebetween. At the center of the resin spacer 67, a hole 67a for accommodating the center electrodes 81 to 83 is formed.

The outer peripheral surface 69b of the permanent magnet 69 used for the isolator 61 is
8b, a bypass is formed between the side wall 68b and the outer peripheral surface 69b, and this bypass shortens the magnetic path formed by the upper case 68, the lower case 64, the permanent magnet 69, and the like. Therefore, the magnetic field distribution of the DC magnetic field applied to the ferrite 80 tends to vary, and the DC magnetic field applied to the ferrite 80 may be weak. Therefore, the outer peripheral surface 69b of the permanent magnet 69
Is provided with a contact prevention film 70.

Further, as a conventional isolator, one described in Japanese Patent Application Laid-Open No. 10-107511 is known. As shown in FIG. 20, this isolator 91
A permanent magnet 99 is attached to the inner surface of the upper case 98, and a substantially U-shaped lower case 94 is mounted to form a magnetic circuit. A resin case 93 is provided on the lower case 94, and a center electrode assembly 101, a matching capacitor element C, and the like are provided in the resin case 93. The center electrode assembly 101 is a microwave ferrite 1
02, center electrodes 103 to 105 are arranged.

The tip 93a of the side wall of the resin case 93 is
Side wall 98b of upper case 98 and outer peripheral surface 9 of permanent magnet 99
9b. Although the functional description of the tip 93a is not described in the specification text, it is for positioning the permanent magnet 99. FIG. 20 is a cross-sectional view showing a part of the isolator 91.
There is no description that the distal end portion 93a is disposed between the outer peripheral surface 99b of the permanent magnet 99 and the side wall 98b of the upper case 98 throughout.

[0007]

However, FIG.
The conventional isolator 61 shown in FIG.
9 requires a complicated operation of applying an insulating material to the outer peripheral surface 69b to form the contact prevention film 70, which causes a problem of increasing the manufacturing cost.

In the conventional isolator 91 shown in FIG. 20, the resin case 93 for positioning the permanent magnet 99 and the lower case 94 are not integrally formed.
The position accuracy of the resin case 93 is low with respect to the lower case 94, and the permanent magnet 99 and the upper case 98
In addition, there is a problem that workability and productivity are poor and manufacturing costs are high. Further, the resin case 93 itself may move, the positional relationship between the permanent magnet 99 and the center electrode assembly 101 may be deteriorated, and the magnetic field distribution may be disturbed to deteriorate the electric characteristics.

An object of the present invention is to provide a non-reciprocal circuit device and a communication device which have a structure in which the outer peripheral surface of the permanent magnet does not contact the inner surface of the side wall of the metal case and can be manufactured at low cost.

[0010]

In order to achieve the above object, a non-reciprocal circuit device according to the present invention comprises (a) a permanent magnet, and (b) a ferrite to which a DC magnetic field is applied by the permanent magnet. (C) a plurality of center electrodes disposed on the ferrite, (d) a resin case for housing the ferrite and the center electrode, and (e) a metal for housing the permanent magnet, the ferrite, and the center electrode. And (f) the resin case and the metal case are integrally formed, and a contact preventing portion extending from the resin case is disposed between an inner surface of a side wall of the metal case and an outer surface of the permanent magnet. It is characterized by having been done.

Further, the non-reciprocal circuit device according to the present invention comprises:
(G) a permanent magnet, (h) a ferrite to which a DC magnetic field is applied by the permanent magnet, (i) a spacer member disposed between the permanent magnet and the ferrite, and (j) a ferrite disposed on the ferrite. A plurality of center electrodes, (k) a resin case accommodating the ferrite and the center electrode,
(L) a metal case accommodating the permanent magnet, the ferrite, and the center electrode; and (m) a contact prevention portion extending from the spacer member includes an inner surface of a side wall of the metal case and an outer periphery of the permanent magnet. And a surface.

With the above arrangement, the contact preventing portion extending from the resin case or the spacer member is disposed between the inner surface of the side wall of the metal case and the outer surface of the permanent magnet. Contact with the outer peripheral surface of the magnet is prevented. In addition, by integrally molding the resin case and the metal case, the positional accuracy of the resin case with respect to the metal case is improved, and workability and productivity are improved.

Further, in the non-reciprocal circuit device according to the present invention, the contact prevention portion extending from the resin case integrally formed with the metal case projects from the inner wall surface of the resin case, and is adapted to the contact prevention portion. The notch is provided in the metal case. According to the above configuration, a part of the contact prevention part is accommodated in the notch provided in the metal case, and the thickness of the metal case apparently absorbs a part of the thickness of the contact prevention part. Therefore, the minimum thickness dimension D required for manufacturing to form the contact prevention portion
_In a state where _min is secured, the distance between the inner surface of the side wall of the metal case and the outer peripheral surface of the permanent magnet can be made smaller than the dimension D _min .

Further, the communication device according to the present invention can obtain excellent frequency characteristics by including the non-reciprocal circuit device having the above-described characteristics.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a nonreciprocal circuit device and a communication device according to the present invention will be described with reference to the accompanying drawings. In each embodiment, the same components and the same portions are denoted by the same reference numerals, and a duplicate description will be omitted.

[First Embodiment, FIGS. 1 to 7] FIG. 1 is an exploded perspective view showing the configuration of an embodiment of a non-reciprocal circuit device according to the present invention. FIG. 2 shows the non-reciprocal circuit device 1 shown in FIG.
1 is a perspective view showing the appearance after assembly is completed. The non-reciprocal circuit device 1
Is a lumped constant type isolator.

As shown in FIG. 1, the lumped-constant isolator 1 includes a resin case 3 and a lower case 4 integrally formed, a center electrode assembly 13, an upper case 8, a permanent magnet 9, A resin spacer 7, a resistance element R, and matching capacitor elements C1 to C3 are provided.

The center electrode assembly 13 has center electrodes 21 to 2 on the upper surface of a microwave ferrite 20 having a rectangular planar shape.
3 with a substantially rectangular insulating sheet (not shown) interposed,
They are arranged so as to cross each other so that their crossing angles are approximately 120 degrees.

The center electrodes 21 to 23 have port portions P1 to P3 on one end side, and the ground electrode 25 on the other end side.
Is connected. The ground electrode 25 common to the center electrodes 21 to 23 is provided so as to substantially cover the lower surface of the ferrite 20. The center electrodes 21 to 23 and the ground electrode 25
g, a conductive material such as Cu, Au, Al, and Be,
It is formed integrally by punching or etching a thin metal plate.

In the center electrode assembly 13, an earth electrode 25 formed on the back surface of the ferrite 20 is connected to the bottom wall 4b of the lower case 4 through a window 3c of the resin case 3 by a method such as soldering. Grounded.

The upper case 8 includes an upper wall 8a and four side walls 8
b. The lower case 4 has four side walls 4.
a and a bottom wall 4b. Two ground terminals 16 respectively extend from the pair of opposed side walls 4a.
The lower case 4 and the upper case 8 are formed by punching and bending a plate made of a high magnetic permeability such as Fe or silicon steel, and then plating the surfaces with Cu or Ag.
This lower case 4 is formed by insert molding.
It is formed integrally with the resin case 3.

The resin case 3 is made of an electrically insulating resin and has a rectangular frame-shaped bottom wall 3a and side walls 3b. A rectangular window 3c is formed at the center of the bottom wall 3a, and windows 3d for accommodating the matching capacitor elements C1 to C3 and the resistance element R are respectively provided on the periphery of the window 3c.
Are formed. The bottom wall 4b of the lower case 4 is exposed at the windows 3c and 3d. A contact prevention portion 6 extends from the tip of the side wall 3b of the resin case 3. An upper case 8 is provided between the contact preventing portion 6 and the side wall 4a of the lower case 4.
A groove 3e into which the side wall 8b is inserted is formed. When the upper case 8 is fitted to the lower case 4, the contact preventing portion 6 is provided with the outer peripheral surface 9 b of the permanent magnet 9 and the side wall 8 of the upper case 8.
b.

Further, input terminals 14 and output terminals 15 for surface mounting are insert-molded in the resin case 3. The output terminal 15 has one end led out from the resin case 3 and the other end exposed to the inner surface of the resin case 3 to form an output lead electrode portion 15a. Input terminal 14
Has one end led out from the resin case 3 and the other end exposed to the inner surface of the resin case 3 so that the input extraction electrode portion 14a
(See FIG. 5). The material of the resin case 3 is
For example, a liquid crystal polymer, PPS, plastic, or the like is used.

[0024] The operating frequency of the matching capacitor elements C1 to C3 (isolator 1, the relative dielectric constant epsilon _r is 9 to 20
0) indicates that the hot-side capacitor electrodes are connected to the port portions P1 to P3.
, And the cold-side capacitor electrode is exposed to the window 3 d of the resin case 3.
Are soldered to the bottom wall 4b.

The resistance element R has terminal electrodes formed on both ends of an insulating substrate by thick-film printing or the like, and a thick-film or thin-film resistor of cermet, carbon, ruthenium, or the like is disposed between them. ing. As a material of the insulating substrate, for example, a dielectric ceramic such as alumina is used. Further, a film such as glass may be formed on the surface of the resistor. One end of the resistance element R is connected to the hot-side capacitor electrode of the matching capacitor element C3, and the other end is connected to the bottom wall 4b of the lower case 4 exposed at the window 3d of the resin case 3. That is, the matching capacitor element C3 and the resistance element R are electrically connected in parallel between the port P3 of the center electrode 23 and the ground.

The resin spacer 7 is made of, for example, an electrically insulating resin such as a liquid crystal polymer, PPS, or plastic, and is disposed on the upper surface of the center electrode assembly 13. The resin spacer 7 is provided with central electrodes 21 and 22 overlapping at the center of the upper surface of the ferrite 20 and a hole 7a for accommodating three insulating sheets. Further, there are provided matching capacitor elements C1 to C3 and a convex portion 7b for absorbing a step between the resistance element R and the center electrode assembly 13.

The above components are provided in the lower case 4
A central electrode assembly 13, matching capacitor elements C1 to C3, a resistive element R, and the like are accommodated in a resin case 3 integrally molded with the resin case 3, and an upper case 8 is mounted. Upper case 8
The upper surface 9a of the permanent magnet 9 is attached to the lower surface of the upper wall 8a,
The resin spacer 7 is disposed below the permanent magnet 9. The permanent magnet 9 applies a DC magnetic field to the center electrode assembly 13. The lower case 4 and the upper case 8 are joined to form a metal case, form a magnetic circuit, and also function as a yoke.

Thus, the non-reciprocal circuit device 1 shown in FIG. 2 is obtained. This non-reciprocal circuit device 1 has a length of 4.0 × 4.
It is a size of 0 × 2.0 mm in thickness. FIG. 3 is an electrical equivalent circuit diagram of the nonreciprocal circuit device 1. FIG.
5 shows a vertical sectional view of the nonreciprocal circuit device 1 shown in FIG. In the first embodiment, as shown in FIG. 4, the distance s between the inner surface of the side wall 8b of the upper case 8 and the outer peripheral surface 9b of the permanent magnet 9 is set to 0.30 mm,
The thickness t of the contact prevention portion 6 of the resin case 3 was set to 0.20 mm.

In the non-reciprocal circuit device 1, the contact preventing portion 6 of the resin case 3 is provided between the inner surface of the side wall 8b of the upper case 8 and the outer peripheral surface 9b of the permanent magnet 9, so that the upper case 8 can be prevented from contacting the inner surface of the side wall 8b and the outer peripheral surface 9b of the permanent magnet 9. Moreover, the resin case 3
Since the lower case 4 and the lower case 4 are integrally formed, the position accuracy of the resin case 3 with respect to the lower case 4 is good, and the permanent magnet 9 can be accurately positioned. Therefore, the positional relationship between the center electrode assembly 13 and the permanent magnet 9 is improved,
The magnetic field distribution is stabilized, and the stability of the electrical characteristics of the non-reciprocal circuit device 1 can be improved. Further, since the contact preventing portion 6 of the resin case 3 secures a space for inserting the side wall 8b of the upper case 8, problems such as the upper case 8 getting on the resin case 3 are suppressed, and the fitting can be performed smoothly. Can be. Therefore, the mounting workability of the upper case 8 is improved, and the cost is reduced.

Further, the size of the permanent magnet 9 can be reduced by the thickness of the contact preventing portion 6 of the resin case 3,
The contact preventing portion 6 of the resin case 3 is inserted into the reduced space of the permanent magnet 9. Since the specific gravity of the reduced space is replaced by the specific gravity of the magnetic material of the permanent magnet 9 and the specific gravity of the resin of the resin case 3 which is smaller than the specific gravity, the product of the difference between the specific gravity of the resin from the magnetic material and the volume of the space is obtained. Only the non-reciprocal circuit device 1 can be made lighter.

As shown in FIG. 6, the side wall 3b of the resin case 3 may be divided into broken lines.
In this case, the amount of resin used can be reduced, and the weight and cost can be reduced.

As shown in FIG. 7, in FIG.
Side wall 4 of lower case 4 and upper case 8 on which input terminal 14, output terminal 15 and ground terminal 16 are arranged
The shape in which a and 8b are omitted may be used. In this case, since that side is only the side wall 3b of the resin case 3,
The non-reciprocal circuit device can be reduced in size.

[Second Embodiment, FIGS. 8 to 10] FIG.
FIG. 6 shows a vertical cross-sectional view of a nonreciprocal circuit device 1a according to the second embodiment. FIG. 9 shows a horizontal sectional view of the nonreciprocal circuit device 1a shown in FIG. As shown in FIGS. 8 and 9, in the second embodiment, the side walls 8 b and 4 of the upper case 8 and the lower case 4 are formed.
The contact preventing portion 7c of the resin spacer 7 is inserted between the inner surface of the permanent magnet 9 and the outer peripheral surface 9b of the permanent magnet 9.

In the non-reciprocal circuit device 1a, the contact preventing portion 7c of the resin spacer 7 prevents the contact between the outer peripheral surface 9b of the permanent magnet 9 and the inner surfaces of the side walls 8b and 4a of the upper case 8 and the lower case 4. be able to. Moreover, as shown in FIG. 4, in the case of the isolator 1, the side wall 3b of the resin case 3
In the case of the isolator 1a, the thickness t of the side wall 3b of the resin case 3 is required to include the width w for forming the contact prevention portion 6, as shown in FIG. It is not necessary to include the width w for forming the contact prevention portion 6. Therefore, the thickness t of the side wall 3b of the resin case 3 of the isolator 1a can be reduced, and the isolator 1a
Can be reduced in size.

Although not shown, the contact preventing portion 7c of the resin spacer 7 may be divided into broken lines. In this case, the amount of resin used can be reduced, and the weight and cost can be reduced.

As shown in FIG. 10, the side walls 4a and 8b of the lower case 4 and the upper case 8 on which the input terminal 14, the output terminal 15 and the ground terminal 16 are arranged are omitted in FIG. It may be of a shape. In this case, the side is only the side wall 3b of the resin case 3, so that the size of the non-reciprocal circuit device can be reduced.

[Third Embodiment, FIGS. 11 and 12] FIG.
FIG. 1 shows a vertical sectional view of a nonreciprocal circuit device 1b according to the third embodiment. FIG. 12 shows the non-reciprocal circuit device 1 shown in FIG.
2b shows a horizontal sectional view. As shown in FIG. 11, the third embodiment is configured by combining the first embodiment and the second embodiment. That is, as shown on the right side of FIGS. 11 and 12, between the inner surface of the side wall 4a of the lower case 4 and the outer peripheral surface 9b of the permanent magnet 9, the resin case 3 integrally formed with the lower case 4 is formed. The side wall 3b is inserted. Similarly, as shown on the left side of FIGS. 11 and 12, between the inner surface of the side wall 8b of the upper case 8 and the outer peripheral surface 9b of the permanent magnet 9, a contact preventing portion 7c of the resin spacer 7 is inserted. The side wall 3b of the resin case 3 extends to near the center of the permanent magnet 9, and the length of the side wall 8b of the upper case 8 is
Is shortened in accordance with the length of the extension. This non-reciprocal circuit device 1b has the same operation and effects as those of the first embodiment and the second embodiment.

Although not shown, the contact preventing portion 7c of the resin spacer 7 is divided into broken lines, the side wall 3b of the resin case 3 is divided into broken lines, The contact preventing portion 6 may be formed on the side wall 3b, and the side wall 8b may be inserted into the groove 3e.

[Fourth Embodiment, FIGS. 13 to 17] FIG.
An exploded perspective view of the nonreciprocal circuit device 1c according to the fourth embodiment is shown in FIG. FIG. 14 shows the non-reciprocal circuit device 1c shown in FIG.
15 is a vertical sectional view, and FIG. 15 is a horizontal sectional view of the nonreciprocal circuit device 1c shown in FIG.

As shown in FIG. 13, the non-reciprocal circuit device 1c
Are a resin case 3 and a lower case 4 integrally formed, a center electrode assembly 13, an upper case 8, a permanent magnet 9, a resin spacer 7, a resistance element R, and a matching capacitor element C1. To C3 and the like.

In the upper case 8, a side wall 8b formed at an end of a substantially rectangular upper wall 8a is opposed. One side wall 8b
Has a notch 8d so as to mesh with a contact prevention portion 3g of the resin case 3 formed on the inner surface of a side wall 4a of the lower case 4 described later. The lower case 4 has left and right side walls 4a and a bottom wall 4b. The lower case 4 is formed integrally with the resin case 3 by an insert molding method. Two ground terminals 16 extend from a pair of opposite sides of the bottom wall 4b of the lower case 4 respectively.

Input terminals 14 and output terminals 15 are insert-molded in the resin case 3. Input terminal 1
One end of the 4 and the output terminal 15 is exposed to the outer wall of the resin case 3, and the other end is exposed to the inner surface of the resin case 3 to form an input lead electrode portion 14 a and an output lead electrode portion 15 a.
Further, on the inner surface of the left and right opposed side walls 4 a of the lower case 4, a contact prevention portion 3 g projecting from the inner surface of the resin case 3 is formed.

A notch 7 d is formed at one end of the resin spacer 7 so as to mesh with the contact preventing portion 3 g of the resin case 3. The notch 8d of the upper case 8 and the notch 7d of the resin spacer 7 correspond to the contact preventing portion 3g of the resin case 3.
Engages. Therefore, a part of the contact prevention part 3g is accommodated in the notch 8d formed in the side wall 8b of the upper case 8, and the thickness of the side wall 8b apparently absorbs a part of the thickness of the contact prevention part 3g.

In general, in order to form a resin, a certain thickness is required in manufacturing. For example, when a liquid crystal polymer is used as the material of the resin case 3, a minimum thickness of 0.2 mm is required. Therefore, usually, the distance s between the inner surface of the side wall 8b of the upper case 8 and the outer peripheral surface 9b of the permanent magnet 9
Is at least 0.2 mm. However, this fourth
In the embodiment, since the notch 8d is formed in the side wall 8b of the upper case 8, the side wall 8b and the outer peripheral surface 9b are formed in a state where the minimum thickness dimension D _min required for manufacturing for forming the contact preventing portion 3g is secured. Can be made smaller than the dimension D _min . For example, assuming that the thickness D of the contact preventing portion 3g is 0.3 mm and the thickness E of the upper case 8 is 0.2 mm, the distance s from the inner surface of the side wall 8b of the upper case 8 to the outer peripheral surface 9b of the permanent magnet 9 is equal to 0. It can be reduced to 1 mm. Therefore,
The isolator 1c can be downsized.

The non-reciprocal circuit device 1c has the same function and effect as those of the first to third embodiments. Further, since the upper case 8 is engaged with the contact preventing portion 3g of the resin case 3, the positioning operation of the upper case 8 can be facilitated. As shown in FIGS. 16 and 17, the non-reciprocal circuit device 1 c includes a side wall 8 b of the upper case 8.
The notch 8d formed on the opposite side wall 8b is formed on the opposite side wall 8b, and the contact preventing portion 3g formed on the side wall 4a of the lower case 4 is formed.
May also be formed on the opposite side wall 4a.
As a result, the notches 8d are provided at both ends of the upper case 8, so that the step of checking the directionality of the upper case 8 can be omitted in the assembly work of the non-reciprocal circuit device 1c, and the manufacturing cost can be reduced. be able to.

[Fifth Embodiment, FIG. 18] In a fifth embodiment, a mobile phone will be described as an example of a communication device according to the present invention.

FIG. 18 is an electric circuit block diagram of the RF portion of the mobile phone 120. In FIG. 18, reference numeral 122 denotes an antenna element, 123 denotes a duplexer, 131 denotes a transmission-side isolator, 132 denotes a transmission-side amplifier, 133 denotes a transmission-side interstage band-pass filter, 134 denotes a transmission-side mixer, 135 denotes a reception-side amplifier, and 136 denotes a reception-side amplifier. 137 is a reception-side mixer, 138 is a voltage controlled oscillator (VCO), and 139 is a local band-pass filter.

Here, the lumped-constant isolator 1, 1a, 1b, 1c of the first to fourth embodiments can be used as the transmission-side isolator 131. By mounting the isolators 1, 1a, 1b, 1c, a mobile phone having excellent electric characteristics can be realized.

[Other Embodiments] The present invention is not limited to the above-described embodiment, and can be modified into various configurations within the scope of the present invention. For example, the shape of the center electrode assembly is not limited to a rectangular shape, but may be any shape such as a cylindrical shape or a deformed square shape. The shape of the permanent magnet is rectangular,
For example, the shape may be a circle or a triangle with rounded corners.

The center electrode may be formed by providing a pattern electrode on a substrate (such as a dielectric substrate, a magnetic substrate, or a laminated substrate) in addition to the one formed by punching and bending a metal plate. it can. Further, the intersection angle of each center electrode may be in the range of 110 to 140 degrees.

In the above embodiment, the present invention is applied to an isolator. However, the present invention is applicable not only to a circulator but also to other high frequency components.

[0052]

As is apparent from the above description, according to the present invention, the contact preventing portion extending from the resin case or the spacer member is arranged between the inner surface of the side wall of the metal case and the outer surface of the permanent magnet. Therefore, contact between the inner surface of the side wall of the metal case and the outer peripheral surface of the permanent magnet can be prevented. In addition, by integrally molding the resin case and the metal case, the positional accuracy of the resin case with respect to the metal case is improved, and workability and productivity can be improved.

Further, the contact preventing portion extending from the resin case integrally formed with the metal case is extended from the inner wall surface of the resin case, and a cutout corresponding to the contact preventing portion is provided on the metal case to prevent the contact. A part of the part is accommodated in a notch provided in the metal case, and the thickness of the metal case apparently absorbs a part of the thickness of the contact prevention part. Therefore,
Minimum thickness dimension D _min required for manufacturing to form a contact prevention part
Is secured, the distance between the inner surface of the side wall of the metal case and the outer peripheral surface of the permanent magnet is set to the minimum thickness dimension D required for manufacturing.
_min .

Further, the communication device according to the present invention can obtain excellent frequency characteristics by including the non-reciprocal circuit device having the above-described characteristics.

[Brief description of the drawings]

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

FIG. 2 is an assembled perspective view of the non-reciprocal circuit device shown in FIG.

FIG. 3 is an electrical equivalent circuit diagram of the non-reciprocal circuit device shown in FIG.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a horizontal sectional view showing a modification of the non-reciprocal circuit device shown in FIG.

FIG. 7 is a horizontal sectional view showing another modification of the nonreciprocal circuit device shown in FIG. 1;

8 is a vertical sectional view showing still another modification of the nonreciprocal circuit device shown in FIG.

FIG. 9 is a sectional view taken along line IX-IX of FIG. 8;

FIG. 10 is a horizontal sectional view showing still another modification of the nonreciprocal circuit device shown in FIG. 1;

FIG. 11 is a vertical sectional view showing still another modification of the nonreciprocal circuit device shown in FIG. 1;

FIG. 12 is a sectional view taken along line XII-XII of FIG. 11;

FIG. 13 is an exploded perspective view showing still another modified example of the non-reciprocal circuit device shown in FIG. 1;

14 is a sectional view taken along the line XIV-XIV in FIG.

FIG. 15 is a sectional view taken along line XV-XV in FIG. 14;

FIG. 16 is a vertical sectional view showing still another modified example of the non-reciprocal circuit device shown in FIG. 1;

FIG. 17 is a sectional view taken along line XVII-XVII of FIG. 16;

FIG. 18 is a block diagram showing one embodiment of a communication device according to the present invention.

FIG. 19 is a vertical sectional view showing an embodiment of a conventional nonreciprocal circuit device.

FIG. 20 is a vertical sectional view showing another embodiment of the conventional non-reciprocal circuit device.

[Explanation of symbols]

 1, 1a, 1b, 1c: Lumped constant type isolator 3: Resin case 3g: Contact prevention part 4: Lower case 6: Contact prevention part 7: Resin spacer (spacer member) 7c: Contact prevention part 7d, 8d: Notch Reference Signs List 8 upper case 9 permanent magnet 9b outer peripheral surface 13 center electrode assembly 20 microwave ferrite 21 to 23 center electrode 120 mobile phone (communication device)

Claims (5)

[Claims] A permanent magnet; a ferrite to which a DC magnetic field is applied by the permanent magnet; a plurality of center electrodes disposed on the ferrite; a resin case accommodating the ferrite and the center electrode; A metal case accommodating the ferrite and the center electrode, wherein the resin case and the metal case are integrally formed, and a contact prevention portion extending from the resin case includes an inner surface of a side wall of the metal case and the permanent magnet. A non-reciprocal circuit device, wherein the non-reciprocal circuit device is disposed between the device and the outer peripheral surface of the device. 2. A permanent magnet, a ferrite to which a DC magnetic field is applied by the permanent magnet, a spacer member disposed between the permanent magnet and the ferrite, and a plurality of center electrodes disposed on the ferrite; A resin case accommodating the ferrite and the center electrode; a metal case accommodating the permanent magnet, the ferrite and the center electrode; and a contact prevention portion extending from the spacer member, an inner surface of a side wall of the metal case. And a non-reciprocal circuit element disposed between the permanent magnet and an outer peripheral surface of the permanent magnet. 3. A permanent magnet, a ferrite to which a DC magnetic field is applied by the permanent magnet, a spacer member disposed between the permanent magnet and the ferrite, and a plurality of center electrodes disposed on the ferrite. A resin case accommodating the ferrite and the center electrode; and a metal case accommodating the permanent magnet, the ferrite, and the center electrode, wherein the resin case and the metal case are integrally formed and extend from the resin case. A non-reciprocal circuit device, wherein the contact preventing portion and the contact preventing portion extending from the spacer member are respectively disposed between an inner surface of a side wall of the metal case and an outer peripheral surface of the permanent magnet. 4. A contact prevention portion extending from the resin case integrally formed with the metal case and protruding from an inner wall surface of the resin case, and a cutout corresponding to the contact prevention portion is formed in the metal case. The non-reciprocal circuit device according to claim 1, wherein the non-reciprocal circuit device is provided. 5. A communication device comprising at least one non-reciprocal circuit device according to claim 1.