JP3702595B2 - Non-reciprocal circuit element - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a non-reciprocal circuit element used in communication equipment such as a mobile phone, such as an isolator or a circulator.
[0002]
[Prior art]
In general, nonreciprocal circuit elements such as lumped constant type isolators and circulators have a characteristic that the attenuation is extremely small in the signal transmission direction and extremely large in the reverse direction.
[0003]
Conventionally, this type of nonreciprocal circuit device includes a magnetic assembly 3 as shown in FIGS. 4 to 6, for example. 4 is a perspective view of the magnetic assembly, FIG. 5 is a plan view showing the top surface of the magnetic assembly, and FIG. 6 is a sectional view taken along line XX of FIG. As shown in FIGS. 4 to 6, the magnetic assembly 3 has the ground conductors in contact with the lower surface of the disk-shaped magnetic body 4, and the central conductors 51 to 53 are placed on the magnetic body 4 so as to enclose the magnetic body 4. Insulating sheets 6 (not shown in FIGS. 4 and 5) are interposed on the upper surface of the first and second bent portions so as to intersect with each other at a predetermined angle. Is configured to project outward from the outer periphery of the magnetic body 4.
[0004]
Each of the center conductors 51 to 53 is made of a metal conductor plate, and each of the center conductors 51 to 53 is formed of two lines in order to reduce insertion loss.
[0005]
The magnetic assembly 3, the permanent magnet, etc. are accommodated in the magnetic yoke constituting the magnetic closed circuit, and matching capacitors are connected to the port portions P1, P2, P3 of the central conductors 51 to 53, and the like. An end portion (ground portion) is connected to the ground, and a DC bias magnetic field is applied to the intersecting portion of each of the central conductors 51 to 53 by a permanent magnet to constitute a nonreciprocal circuit element.
[0006]
[Problems to be solved by the invention]
Mobile communication devices such as mobile phones that employ this type of nonreciprocal circuit element are rapidly becoming smaller and thinner, and there is a strong demand for further reduction in size and thickness of nonreciprocal circuit elements. .
[0007]
However, in the conventional non-reciprocal circuit device, the widths and line intervals of the respective central conductors 51 to 53 are formed with substantially the same dimensions, so that all the three central conductors 51 to 53 are formed as shown in FIG. Overlapping portions are generated, and the thickness T at the intersecting portion cannot be made smaller than the total size of the three central conductors 51 to 53 and the three insulating sheets 6, so that the magnetic assembly 3 can be made thinner and thus non- There is a limit to reducing the thickness of the reversible circuit element.
[0008]
Accordingly, an object of the present invention is to provide a non-reciprocal circuit device that can reduce the thickness at the intersecting portion of the central conductor and reduce the overall thickness.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, three central conductors made of thin metal plates intersect each other at a predetermined angle with an insulating sheet interposed on one main surface of a magnetic body. In the non-reciprocal circuit device including the magnetic assembly that is bent and arranged, at least one central conductor is composed of two lines, and the line spacing of the central conductors is larger than the intersection width of the other two central conductors. Is set so that the two lines do not overlap the intersection of the other two central conductors.
[0010]
According to a second aspect of the present invention, in the nonreciprocal circuit device according to the first aspect, the central conductor constituted by the two lines is arranged at the top.
According to the above configuration, at least one central conductor is composed of two lines, the line spacing of the central conductors is set larger than the intersection width of the other two central conductors, and the two lines are It is arranged so that it does not overlap the intersection of the two center conductors, and it is possible to eliminate the overlap of all three center conductors, so the thickness at the intersection of the three center conductors is the thickness of the center conductor. It is possible to reduce the minute. Therefore, the magnetic assembly can be thinned, and the entire nonreciprocal circuit element can be thinned.
[0011]
The center conductor constituted by the two lines and set to be larger than the intersection width of the other two center conductors is preferably arranged at the top. That is, in this case, the difference in the widths and line intervals of the three central conductors can be made smaller than in the other configurations.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof.
FIG. 1 is a plan view of a magnetic assembly and an isolator configuration according to an embodiment of the present invention, FIG. 2 is a developed view of a central conductor, and FIG. 3 is an XX line in FIG. It is sectional drawing.
[0013]
As shown in FIG. 1, the isolator of this embodiment is a magnetic assembly in which three center conductors 51, 52, 53 are arranged on a magnetic body 4 so as to be electrically insulated from each other and at a predetermined angle. The solid conductor 3 has capacitors C1, C2, and C3 as matching circuit elements connected to the port portions P1, P2, and P3 of the central conductors 51 to 53, and the other ends thereof are connected to the ground. A DC bias magnetic field is applied to the intersections of .about.53 by a permanent magnet (not shown), and a termination resistor R is connected to one port portion P3.
[0014]
The center conductors 51 to 53 are formed by punching a metal conductor plate such as copper. As shown in the developed view of FIG. 2, the center conductors 51 to 53 are at a predetermined angle (120 degrees in the figure). In order to reduce the insertion loss, the central portion is punched into a rectangular shape to form two lines. ing.
[0015]
As shown in FIGS. 1 and 3, the magnetic assembly 3 has the ground conductor 55 in contact with the lower surface of the disk-shaped magnetic body 4 made of ferrite or the like, and the central conductors 51 to 53 so as to wrap the magnetic body 4. Are arranged so as to be bent so as to cross each other with an insulating sheet 6 (not shown in FIG. 1) interposed on the upper surface of the magnetic body 4.
[0016]
The line interval WL of the center conductor 53 arranged at the top is set to be larger than the intersection width Wk of the other two center conductors 51 and 52, and the center conductor 53 is at the intersection of the center conductors 51 and 52. Arranged so as not to overlap.
[0017]
Each insulating sheet 6 is made of an insulating resin material such as polyimide, and an adhesive is pasted on one or both main surfaces, and in order to electrically insulate the central conductors 51 to 53 from each other, It is used for stably fixing the conductors 51 to 53 so as to be in close contact with the magnetic body 4. The bending arrangement of the center conductors 51 to 53 on the magnetic body 4 is performed using a jig so that each center sheet 51 to 53 is pressed against the magnetic body 4 by each insulating sheet 6 and is stably fixed.
[0018]
The magnetic assembly 3 and the permanent magnet are housed in a magnetic yoke (not shown) constituting a magnetic closed circuit, and each port portion P1 to P3 corresponding to the tip of each central conductor 51 to 53 has a matching unit. One electrode surface of the plate capacitors C1 to C3 is connected to one electrode of a chip resistor R for a terminating resistor at one port portion P3 to form an isolator. The magnetic assembly 3 is arranged in a state of being pressed by a permanent magnet or a pressing member. In general, the port portion, which is the tip portion of each central conductor, is appropriately processed into a shape that provides stable connection with other components such as capacitors. In some cases, an insulating sheet covering the uppermost central conductor is not used.
[0019]
The external dimensions of the isolator of this example are approximately W 7.0 × L 7.0 × H 2.5 mm, the center conductor is about 50 μm thick, the insulating sheet is 50 to 80 μm thick, and the magnetic body 4 is about 550 μm thick. It is used.
[0020]
In the configuration of this embodiment, the two lines of the center conductor 53 arranged at the top are arranged so as not to overlap the intersection of the other two center conductors 51 and 52, as shown in FIG. Further, the central conductor 53 can be disposed on the two insulating sheets 6 disposed below, and the thickness T at the portion where the three central conductors 51 to 53 intersect with each other can be determined as the central conductors 51, 52 and 3. It can be set as the dimension of the total value of the thickness of the insulating sheet 6 of a sheet. Therefore, the thickness (height) of the magnetic assembly 3 can be reduced by the thickness of the central conductor (in this embodiment, about 50 μm), and the entire isolator using the magnetic assembly 3 can be reduced in thickness. .
[0021]
In order to further reduce the difference between the three line intervals, it is preferable to arrange the center conductor having a large line interval at the top as in the above embodiment, but the present invention is not limited to this, and the line interval is large. You may make it arrange | position a center conductor in the lowest part or the middle.
[0022]
The three central conductors do not have to be composed of two lines. One central conductor is composed of two lines, and the distance between the central conductors is set to the other two central conductors. It may be formed larger than the intersection width.
[0023]
【The invention's effect】
As described above, according to the non-reciprocal circuit device according to the present invention, the line interval of at least one central conductor is set larger than the intersection width of the other two central conductors, It is arranged so that it does not overlap the intersection of the two center conductors, and it is possible to eliminate the overlap of all three center conductors, so the thickness at the intersection of the three center conductors is the thickness of the center conductor. It is possible to reduce the minute.
[0024]
In order to reduce the difference in width and line spacing of the three central conductors, the center conductor composed of two lines and set larger than the intersection width of the other two central conductors should be placed at the top. Is preferred.
[0025]
Therefore, according to the present invention, the magnetic assembly can be thinned, and the entire non-reciprocal circuit element can be thinned.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a configuration of a magnetic assembly and an isolator according to an embodiment of the present invention.
FIG. 2 is a development view of a central conductor according to an embodiment of the present invention.
3 is a cross-sectional view taken along line XX of FIG.
FIG. 4 is a perspective view of a magnetic assembly of a conventional non-reciprocal circuit device.
FIG. 5 is a plan view of a magnetic assembly of a conventional non-reciprocal circuit device.
6 is a cross-sectional view taken along line XX of FIG.
[Explanation of symbols]
3 Magnetic assembly 4 Magnetic bodies 51 to 53 Central conductors P1 to P3 Port portions C1 to C3 Matching capacitor R Terminating resistance

Claims (2)

A non-reciprocal circuit device comprising a magnetic assembly in which three central conductors made of a thin metal plate are arranged so as to intersect each other at a predetermined angle with an insulating sheet interposed on one main surface of a magnetic body In
At least one center conductor is composed of two lines, the line spacing of the center conductors is set to be larger than the intersection width of the other two center conductors, and the two lines are the other two center conductors. A non-reciprocal circuit device, which is arranged so as not to overlap an intersection. 2. The nonreciprocal circuit device according to claim 1, wherein the central conductor composed of the two lines is arranged at the top.

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