JP2002141709A - Irreversible circuit element and communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an irreversible circuit element that employs a thin resin case with a prevents a defect at fitting of a yoke to the case, facilitates the fitting work and prevents the yoke fitted to the case from falling off. SOLUTION: An input output terminal 9 and an earth terminal 10 are formed to the resin case 1, a ferrite core 4 with a center conductor 5 placed thereto, a capacitive element 7, and a resister 8 are placed in the resin case 1, an upper yoke 2 with a permanent magnet 6 placed thereto with respect to the ferrite core 4 with the center conductor 5 placed thereto is fitted to the case 1 and a lower yoke 3 opposite to the upper yoke 2 is placed at the opposite side of the resin case 11. A recessed part 11 is formed to two side walls opposite to each other in the resin case 1 as notches, two side walls of the upper yoke 2 are formed with a larger outer width than the inner width of the recessed parts 11 in a form of projections 12 projected in a mount direction to the resin case 1 so as to be fitted to the recessed parts 11 and then they are fitted with each other.

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 an isolator and a circulator used in a microwave band or the like, and a communication device having the same.

[0002]

2. Description of the Related Art A non-reciprocal circuit device in which a center conductor, a ferrite core and a permanent magnet are disposed between upper and lower yokes that also serve as parts of a case is disclosed in Japanese Utility Model Laid-Open Publication No. 3-79507.

Further, Japanese Patent Application Laid-Open No. 9-321504 discloses a non-reciprocal circuit device in which a substrate is fixed to an opening of a resin case.

The non-reciprocal circuit element is characterized in that a static magnetic field is applied to a ferrite core provided with a center conductor, a capacitor element, a resistor, an input / output electrode, and a resin case provided with an earth electrode, and the ferrite core. And a lower yoke facing the lower surface of the resin case.

A pair of upper and lower yokes has a notch formed in a pair of opposing side surfaces, and an engagement claw is formed at an edge of the recess. On the other hand, in the resin case, a protrusion-like fitting portion is bulged and formed on the side wall portion so as to fit with the pair of yokes.

[0006] When assembling these, the lower yoke is fitted to the fitting portion of the resin holder, and the engaging claw is hung and fixed. Similarly, the upper yoke is fitted and the engaging claw is attached. Hang and fix.

In the non-reciprocal circuit device, a columnar projection is formed on an end surface of an opening of a resin case, a mounting hole is formed on a substrate side, and the projection and the mounting hole are fitted to each other. The board is fixed.

[0008]

However, the non-reciprocal circuit device having such a conventional structure has the following problems to be solved. That is, when the entire non-reciprocal circuit device is designed to be small, it is necessary to reduce the size of each of its components, but in the fitting portion, the thickness of the resin case and each of the yokes is reduced. It becomes necessary to make it thin. However, in the conventional fitting method, when the thickness of the resin case is reduced, the mechanical strength of the resin case decreases, and when the fitting is performed, cracks, cracks, and the like occur in the resin case, and a defect occurs. . Specifically, when the thickness of the resin portion becomes 0.2 mm or less, cracks, cracks, and the like occur in the fitting portion.

SUMMARY OF THE INVENTION It is an object of the present invention to securely fit a resin case and each yoke without causing cracks, cracks, etc. even when the thickness of the resin case and each yoke is reduced by using light and thin parts as a whole. An object of the present invention is to provide a non-reciprocal circuit device which can be combined and does not impair the mechanical strength of the resin case.

[0010]

According to the present invention, a center conductor electrically connected to an input / output terminal and a ferrite core adjacent to the center conductor are arranged in a resin case having an input / output terminal. A pair of upper yoke and lower yoke are mounted on the upper and lower sides, and a permanent magnet for applying a static magnetic field to the ferrite core is provided.
A concave portion that is recessed in the mounting direction on one side wall, and a convex portion that protrudes in the mounting direction with respect to the resin case is provided on at least two opposing side walls of the upper yoke or the lower yoke so as to be wider than the width of the concave portion. A non-reciprocal circuit device is formed by fitting and integrating the protrusions. With this structure, even when the thickness of the resin case is thin, the fitting is securely performed without causing cracks, cracks, or the like in the fitting portion, and a decrease in mechanical strength is prevented.

Further, according to the present invention, at least two opposing side walls of the upper yoke or the lower yoke are provided with concave portions recessed in the mounting direction with respect to the resin case, and the at least two opposing side walls of the resin case project in the mounting direction. The non-reciprocal circuit device is formed by providing a portion wider than the width of the concave portion, fitting the concave portion and the convex portion and integrating them. Even with this structure, even if the thickness of the resin case is thin, the fitting is securely performed without causing cracks, cracks, or the like in the fitting portion, and a decrease in mechanical strength is prevented.

Further, according to the present invention, two opposing side walls of an upper yoke or a lower yoke and two opposing side walls of a resin case are respectively set as a set, and two sets of side walls of the resin case are provided with recesses, and are opposed to the recesses. Then, a convex portion is provided on the two side walls of the upper yoke or the lower yoke wider than the width of the concave portion, and the convex portion and the concave portion are fitted and integrated. With this structure, the mechanical strength is increased as compared with the case where the fitting is performed using only the two side walls.

Further, according to the present invention, two opposing side walls of the upper yoke or the lower yoke and two opposing side walls of the resin case are respectively set as a set, and a concave portion is provided in the two sets of the upper yoke or the lower yoke. Opposite to this, a convex portion is provided on two sets of side walls of the resin case wider than the concave portion, and the concave portion and the convex portion are fitted and integrated. With this structure, the mechanical strength is similarly increased as compared with the case of fitting using only the two side walls.

Further, according to the present invention, the width of the fitting portion of the convex portion is
0.01 mm or more from the width of the fitting portion of the concave portion, and
It is formed widely in a range of 1 mm or less. This dimensional relationship prevents the fitting portion from cracking, cracking, and the like, and prevents the fitting portion from coming off after fitting.

Further, according to the present invention, the base of the projection is formed as a constricted shape having a width smaller than that of the tip of the projection. This shape reliably prevents the fitting portion from coming off after fitting.

Further, according to the present invention, a communication device is provided with the non-reciprocal circuit device.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a non-reciprocal circuit device according to a first embodiment will be described with reference to FIG. (A) of FIG.
FIG. 3 is an exploded perspective view of a non-reciprocal circuit device. FIG. 1 (B)
FIG. 4 is a front view showing a fitted state. In FIG. 1A, reference numeral 1 denotes a resin case. The resin case 1 has an input / output terminal 9 and a ground terminal 10 formed therein.
In the resin case 1, a ferrite core 4, in which a center conductor 5 is arranged, a capacitor 7, and a resistor 8 are provided. Further, an upper yoke 2 having a permanent magnet 6 for applying a static magnetic field is disposed on a ferrite core 4 having the center conductor 5 disposed thereon, and a lower yoke 3 is disposed on a side facing the upper yoke 2. On opposite two side walls of the resin case 1, recesses 11 which are recessed in a mounting direction to the upper yoke 2 are formed by notches,
The entire two opposing side walls of the upper yoke 2 are formed as protrusions 12 so as to fit into the recesses. here,
The outer width of the convex portion 12 is formed wider than the inner width of the concave portion 11.

In a state where the upper yoke 2 is integrated with the resin case 1, the convex portion 12 of the upper yoke 2 fits into the concave portion 11 of the resin case 1 as shown in FIG. This fitting is performed between two opposing side walls of the upper yoke 2 and the resin case 1. In this way, by fitting on two surfaces, the mechanical strength of the fitting portion is maintained.

Next, the configuration of the nonreciprocal circuit device according to the second embodiment will be described with reference to FIG. (A) of FIG.
It is an exploded perspective view of a non-reciprocal circuit element. FIG. 2 (B)
It is a front view which shows a fitting state. The non-reciprocal circuit device shown in FIG. 2A differs from the non-reciprocal circuit device according to the first embodiment in the shape of the resin case 1 and the shape of the upper yoke 2. The overall configuration is first
This is the same as in the embodiment. However, in FIG. 2, components other than the upper yoke 2 and the resin case 1 are omitted.

On two opposing side walls of the upper yoke 2,
A concave portion 11 that is recessed in the mounting direction to the resin case 1 is formed with a notch, and a convex portion 12 protruding in the mounting direction of the upper yoke 2 is formed on two opposing side walls of the resin case 1 so as to fit into the concave portion. Is formed. Here, the outer width of the convex portion 12 is formed wider than the inner width of the concave portion 11.

With the upper yoke 2 integrated with the resin case 1, the concave portion 11 of the upper yoke 2 is fitted into the convex portion 12 of the resin case 1 as shown in FIG. This fitting is performed between two opposing side walls of the upper yoke 2 and the resin case 1. In this way, by fitting on two surfaces, the mechanical strength of the fitting portion is maintained.

Next, the configuration of the nonreciprocal circuit device according to the third embodiment will be described with reference to FIG. FIG. 3 is an exploded perspective view of the non-reciprocal circuit device. The non-reciprocal circuit device shown in FIG. 3 is different from the non-reciprocal circuit device according to the first embodiment in the shape of the resin case 1 and the shape of the upper yoke 2. This is the same as in the first embodiment. However, in FIG. 3, components other than the upper yoke 2 and the resin case 1 are omitted.

As shown in FIG. 3, two opposite side walls of the resin case 1 are formed with notches 11 which are recessed in the mounting direction of the upper yoke 2 so as to fit into the recesses. The entire two opposing side walls of the upper yoke 2 are formed as protrusions 12 projecting in the mounting direction to the resin case 1. Here, the outer width of the convex portion 12 is formed wider than the inner width of the concave portion 11.

As described above, the upper yoke 2 and the resin case 1
With the structure fitted with the four side walls, the first
Higher mechanical strength can be obtained than the two-sided fitting shown in the embodiment.

Next, the configuration of a nonreciprocal circuit device according to a fourth embodiment will be described with reference to FIG.

FIG. 4 is an exploded perspective view of the non-reciprocal circuit device. The non-reciprocal circuit device shown in FIG. 4 includes a resin case 1 and an upper yoke 2 in the non-reciprocal circuit device according to the first embodiment.
The shape of the other parts and the overall configuration are the same as those in the first embodiment. However, in FIG. 4, components other than the upper yoke 2 and the resin case 1 are omitted.

As shown in FIG. 4, a pair of opposing side walls is formed on one pair of opposing side walls of the resin case 1 so as to protrude in the mounting direction of the upper yoke 2. Also, the projection 1 protruding in the mounting direction of the upper yoke 2
2 'is formed. However, the convex portion 12 ′ is
Unlike this, it is formed by partially reducing the thickness of the side wall. The two sets of two opposing side walls of the upper yoke 2 have recesses 11, 1 recessed in the mounting direction to the resin case 1.
1 'is formed. Here, the outer width of the convex portion 12 is formed wider than the inner width of the concave portion 11.

As described above, the upper yoke 2 and the resin case 1
With the structure fitted with the four side walls,
Higher mechanical strength can be obtained than the two-sided fitting shown in the embodiment.

Next, the structure of a nonreciprocal circuit device according to a fifth embodiment will be described with reference to FIG. (A) of FIG.
It is an exploded perspective view of a non-reciprocal circuit element. FIG. 5 (B)
It is a front view which shows a fitting state. The non-reciprocal circuit device shown in FIG. 5A has a configuration in which the resin case 1 and the lower yoke 3 in the non-reciprocal circuit device according to the first embodiment have different shapes and are provided with fitting portions. The shape and overall configuration of the other parts are the same as those in the first embodiment.

On two opposite side walls of the resin case 1,
A concave portion 11 is formed to be recessed in the mounting direction of the lower yoke 3, and a convex portion 12 protruding in the mounting direction to the resin case 1 is formed on two opposing side walls of the lower yoke 3 so as to fit into the concave portion. Is formed. Here, the outer width of the convex portion 12 is formed wider than the inner width of the concave portion 11.

In a state where the lower yoke 3 is integrated with the resin case 1, the convex portion 12 of the lower yoke 3 is fitted into the concave portion 11 of the resin case 1 as shown in FIG.
This fitting is made between two opposing side walls of the lower yoke 3 and the resin case 1. In this way, by fitting on two surfaces, the mechanical strength of the fitting portion is maintained.

Next, the configuration of the nonreciprocal circuit device according to the sixth embodiment will be described with reference to FIG. (A) of FIG.
It is an exploded perspective view of a non-reciprocal circuit element. FIG. 6 (B)
It is a front view which shows a fitting state. The non-reciprocal circuit device shown in FIG. 6A is different from the non-reciprocal circuit device according to the fifth embodiment in that the resin case 1 and the lower yoke 3 are different in shape. The configuration of the fifth
This is the same as in the embodiment.

On two opposing side walls of the lower yoke 3,
A concave portion 11 that is recessed in the mounting direction to the resin case 1 is formed with a notch, and a convex portion 12 that projects in the mounting direction of the lower yoke 3 is formed on two opposing side walls of the resin case 1 so as to fit into the concave portion. Is formed. Here, the outer width of the convex portion 12 is formed wider than the inner width of the concave portion 11.

With the lower yoke 3 integrated with the resin case 1, the concave portion 11 of the lower yoke 3 is fitted into the convex portion 12 of the resin case 1 as shown in FIG.
This fitting is made between two opposing side walls of the lower yoke 3 and the resin case 1. In this way, by fitting on two surfaces, the mechanical strength of the fitting portion is maintained.

Next, the configuration of the nonreciprocal circuit device according to the seventh embodiment will be described with reference to FIG. FIG. 7 is an exploded perspective view of the non-reciprocal circuit device. The non-reciprocal circuit device shown in FIG. 7 is different from the non-reciprocal circuit device according to the fifth embodiment in the shape of the resin case 1 and the shape of the lower yoke 3. , And the fifth embodiment.

On two opposite side walls of the resin case 1, there are formed concave portions 11 which are recessed in the mounting direction of the lower yoke 3, and the two pairs of the lower yokes 3 are opposed to each other so as to fit into the concave portions. The entire two side walls are formed as protrusions 12 protruding in the mounting direction to the resin case 1. Here, the outer width of the convex portion 12 is formed wider than the inner width of the concave portion 11.

By adopting a structure in which the lower yoke 3 and the resin case 1 are fitted to each other on the four side walls, a higher mechanical strength can be obtained than in the case where the two surfaces are fitted as shown in the fifth embodiment.

Next, the configuration of a nonreciprocal circuit device according to the eighth embodiment will be described with reference to FIG. FIG. 8 is an exploded perspective view of the non-reciprocal circuit device. The non-reciprocal circuit device shown in FIG. 8 is different from the non-reciprocal circuit device according to the fifth embodiment in that the shapes of the resin case 1 and the lower yoke 3 are different from each other. This is the same as in the embodiment. A recess 11 is cut out in two opposite side walls of the lower yoke 3 in the mounting direction to the resin case 1, and two sets of two opposite sides of the resin case 1 are fitted so as to fit into the recess. On one of the side walls, a convex portion 12 protruding in the mounting direction of the lower yoke 3 is formed. Here, the outer width of the convex portion 12 is formed wider than the inner width of the concave portion 11.

By adopting a structure in which the lower yoke 3 and the four side walls of the resin case 1 are fitted to each other, higher mechanical strength can be obtained than in the case of fitting the two surfaces shown in the fifth embodiment.

The shape of each fitting portion in the first to eighth embodiments will be described with reference to FIGS.

FIG. 9 is a diagram showing the shape of the convex portion in the fitting portion, and FIG. 10 shows the relationship between the difference in width between the convex portion and the concave portion of the fitting portion and the defect in the fitting operation. FIG. The convex portion 1 in the fitting portion shown in the first to eighth embodiments
As shown in FIG. 9, the shape of No. 2 is formed such that the width of the tip is wider than the width of the base, and the base of the projection has a constricted shape. The joint connecting the two width portions forms a predetermined angle. (A) is an example where the angle a is an acute angle, and (B) is an example where the angle a is an obtuse angle. Also,
The corners at the ends of both ends of the convex portion 12 are R = 0.03 m.
A round chamfer of about m is provided. Therefore, the protrusion 12
Insertion into the recess 11 becomes easy.

The difference between the width of the tip of the projection 12 and the width of the recess 11 shown in the first to eighth embodiments is less than 0.01 mm, as shown in FIG. Detachment of the fitting part occurs, and if it is wider than 0.1 mm, defects such as cracks occur in the fitting part of the resin case and the yoke at the time of fitting,
It is formed with a thickness of 0.01 mm or more and 0.1 mm or less.

With this structure, it is possible to prevent a decrease in mechanical strength without causing cracks, cracks, and the like in the fitting portion. Moreover, it is possible to prevent the fitting portion from coming off after the fitting.

In the first to eighth embodiments, the resin case 1 is made of an engineering plastic such as a liquid crystal polymer, an amorphous polymer, or a crystalline polymer, which has excellent wear resistance and impact resistance. Useful as

Next, the configuration of the communication device according to the ninth embodiment will be described with reference to FIG. FIG. 11 is a block diagram of the communication device. In FIG. 11, ANT is a transmitting / receiving antenna, DPX is a duplexer, BPFa, BPF
b is a bandpass filter, AMPa and AMPb are amplifier circuits, MIXa and MIXb are mixers, OSC is an oscillator, SYN is a frequency synthesizer, and ISO is an isolator.

MIXa represents the input IF signal and SYN
, The BPFa passes only the transmission frequency band of the mixed output signal from the MIXa, the AMPa amplifies the power, and the isolator ISO
And ANT via DPX. The isolator ISO prevents a reflected signal from the DPX or the like to the AMPa, thereby preventing distortion from occurring in the AMPa. AMPb amplifies the received signal extracted from DPX. BPFb allows only the reception frequency band of the reception signal output from AMPb to pass. The MIXb mixes the frequency signal output from the SYN with the received signal and outputs an intermediate frequency signal IF.

As the isolator ISO part shown in FIG. 11, an isolator having a resistor connected to one port of the nonreciprocal circuit device shown in the first to eighth embodiments and used as a termination port is used. As described above, by using a small, low-profile, high-strength isolator, a highly reliable, thin, lightweight communication device such as a mobile phone can be obtained.

[0048]

According to the present invention, the shape of the fitting portion between the yoke and the resin case can be reduced even if the thickness of the resin portion is reduced in order to reduce the weight of each component. Accordingly, it is possible to form without causing cracks, cracks, and the like in the fitting portion at the time of fitting, and a highly reliable nonreciprocal circuit device can be configured.

Further, according to the present invention, the fitting operation can be easily performed and the detachment after the fitting can be prevented by the shape of the fitting portion between the yoke and the resin case.
A highly productive non-reciprocal circuit device can be configured.

Further, according to the present invention, a highly reliable, thin and lightweight communication device can be constructed by using the non-reciprocal circuit device.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a non-reciprocal circuit device according to a first embodiment and a front view showing a fitted state.

FIG. 2 is an exploded perspective view of a non-reciprocal circuit device according to a second embodiment and a front view showing a fitted state.

FIG. 3 is an exploded perspective view of a non-reciprocal circuit device according to a third embodiment.

FIG. 4 is an exploded perspective view of a non-reciprocal circuit device according to a fourth embodiment.

FIG. 5 is an exploded perspective view of a non-reciprocal circuit device according to a fifth embodiment and a front view showing a fitted state.

FIG. 6 is an exploded perspective view of a non-reciprocal circuit device according to a sixth embodiment and a front view showing a fitted state.

FIG. 7 is an exploded perspective view of a non-reciprocal circuit device according to a seventh embodiment.

FIG. 8 is an exploded perspective view of a non-reciprocal circuit device according to an eighth embodiment.

FIG. 9 is a view showing a shape of a convex portion in a fitting portion.

FIG. 10 is a diagram showing a relationship between a difference in width between a convex portion and a concave portion of a fitting portion and a defect in a fitting operation.

FIG. 11 is a block diagram of a communication device according to a ninth embodiment;

[Explanation of symbols]

 1-resin case 2-upper yoke 3-lower yoke 4-ferrite core 5-center conductor 6-permanent magnet 7-capacitance element 8-resistor 9-input / output terminal 10-ground terminal 11-recess 12-convex

Claims (7)

[Claims] A center conductor electrically connected to the input / output terminal and a ferrite core adjacent to the center conductor are arranged in a resin case having an input / output terminal; A non-reciprocal circuit device comprising a yoke and a lower yoke, and a permanent magnet for applying a static magnetic field to the ferrite core on at least one of the upper yoke and the lower yoke. Protrusions projecting in the mounting direction with respect to the resin case are provided on two side walls, and recesses recessed in the mounting direction are provided on at least two opposing side walls of the resin case, and the width of the protrusions is set to the width of the recess. The upper yoke or the lower yoke and the resin case by fitting the concave portion and the convex portion. Non-reversible circuit element that is integrated. 2. A resin case having an input / output terminal, a center conductor electrically connected to the input / output terminal, and a ferrite core adjacent to the center conductor, and a pair of upper and lower upper and lower parts of the resin case. A non-reciprocal circuit device comprising a yoke and a lower yoke, and a permanent magnet for applying a static magnetic field to the ferrite core on at least one of the upper yoke and the lower yoke. The two side walls are provided with concave portions that are recessed in the mounting direction with respect to the resin case, and at least two opposing side walls of the resin case are provided with convex portions that protrude in the mounting direction, and the width of the convex portions is set to the width of the concave portion. The upper yoke or the lower yoke and the resin case by fitting the convex portion and the concave portion. Non-reversible circuit element which is embodied. 3. A pair of two opposing side walls of the upper yoke or the lower yoke and two opposing side walls of the resin case are respectively provided as a set, and the projection is provided on two sets of the side walls of the upper yoke or the lower yoke. 2 of the resin case
The non-reciprocal circuit device according to claim 1, wherein the recess is provided in a pair of side walls. 4. A pair of two opposing side walls of the upper yoke or the lower yoke and two opposing side walls of the resin case are respectively formed as a set, and the concave portion is provided on two sets of the side walls of the upper yoke or the lower yoke. 2 of resin case
3. The non-reciprocal circuit device according to claim 2, wherein the convex portions are provided on a pair of side walls. 5. The method according to claim 1, wherein a width of the fitting portion of the convex portion is wider than a width of the fitting portion of the concave portion by 0.01 mm or more and 0.1 mm or less. 2. The non-reciprocal circuit device according to claim 1. 6. The non-reciprocal circuit device according to claim 1, wherein the base of the projection has a constricted shape having a width smaller than the tip of the projection. 7. A communication device comprising the non-reciprocal circuit device according to claim 1.