JPH09307315A - Irreversible circuit component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small sized and low profile irreversible circuit component at a low cost with a few number of components and ease of assembling and manufacture being able to cope with the SMD system by forming ground electrode and input/output terminals to an insulator body with magnetism and using a magnetic insulation board with a large insulation resistance replacing a conventional lower magnetic yoke as ground board. SOLUTION: A matching capacitor 5 is provided to a magnetic insulation board 4 as ground board of the irreversible circuit component and ground electrodes 9, 13 and input output electrodes 12 are formed to the insulator with magnetism. A matching capacitor container recessed part 8 is provided at a position corresponding to the matching capacitor 5 at an electrode board 3 laminated on the board 4. A ferrite disk 2 is contained in a round hole made open in the middle of the board 3 and a center conductor plate 1 is laminated thereon. Furthermore, an upper magnetic yoke 6 in close contact with the permanent magnet disk 7 and the ground electrode 13 of the board 4 is covered on the plate 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonreciprocal circuit device mainly used for microwave communication equipment, mobile communication equipment and the like.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of non-reciprocal circuit device, there is, for example, one shown in an exploded perspective view of FIG.

This non-reciprocal circuit device is provided with a matching capacitor 105, a ground electrode 109 and an input / output electrode 1.
A grounding substrate 104 on which 10 is formed, and a grounding electrode 10
9 and an input / output electrode 110 are formed, and an electrode substrate 103 is provided with a matching capacitor setting concave portion 108 at a position corresponding to the matching capacitor 105, and is housed in a circular hole opened in the central portion of the electrode substrate 103. Ferrite disk 102
And a center conductor plate 101 are stacked in this order, and the laminated body is housed in a case 111 in which a ground terminal 113 and an input / output terminal 112 are provided at predetermined locations, and a disk-shaped permanent magnet plate 107 is provided from above. And the upper magnetic yoke 106,
The lower part is covered with a lower magnetic yoke 114.

Of these, the electrode substrate 103 is the central conductor plate 1.
01 and the ground substrate 104 are provided in order to obtain required conduction, and the case 111 is provided with a ground terminal 113 and an input / output terminal 112 so as to ensure conduction at a necessary place.

In this nonreciprocal circuit device, the permanent magnet plate 10 is used.
7, the upper magnetic yoke 106 and the lower magnetic yoke 114 form a closed magnetic circuit, and a DC magnetic field is applied to the ferrite disk 102 and the central conductor plate 101.

[0006]

In the case of the above-mentioned nonreciprocal circuit device, there is a risk that magnetic field leakage in the open magnetic circuit may adversely affect peripheral components and peripheral equipment. Therefore, in order to prevent this, the upper magnetic yoke is used. And the lower magnetic yoke are indispensable, and the SMD method (Subscriber M
ultiplexing Digital system
In order to comply with m), the case needs to be provided with an input / output terminal and a ground terminal for the SMD method in which the height corresponding to the thickness of the lower magnetic yoke is supplemented.

For this reason, the conventional non-reciprocal circuit device has a large number of parts, which requires a lot of trouble in assembling and manufacturing, and tends to increase the cost. In particular, a case provided with an input / output terminal and a ground terminal for the SMD system has a complicated structure and is an expensive component, which makes it difficult to reduce the cost of the entire device.

The present invention has been made to solve the above problems, and its technical problem is that the number of parts is small, the assembly and the manufacture are easy, and the small size and the low height are compatible with the SMD system. And to provide a low-cost non-reciprocal circuit device.

[0009]

According to the present invention, a laminated body in which a ground substrate, a ferrite plate, and a central conductor plate are laminated in this order is sandwiched between an upper magnetic yoke and a lower magnetic yoke. In addition, in the nonreciprocal circuit device in which a permanent magnet plate for applying a DC magnetic field is interposed on the upper magnetic yoke side, the ground substrate is an insulating member having a magnetic insulator and an input / output electrode and a ground electrode formed on the insulating substrate. A non-reciprocal circuit device can be obtained which is composed of a magnetic insulating substrate having a large resistance and which substitutes the lower magnetic yoke.

Further, according to the present invention, in the nonreciprocal circuit device, the magnetic material of the magnetic insulating substrate has a saturation magnetic flux density higher than that of the ferrite material of the ferrite plate and has a sufficiently small magnetic permeability in the vicinity of the operating frequency. A non-reciprocal circuit device is obtained.

Further, according to the present invention, in any of the nonreciprocal circuit devices described above, an input / output electrode and a ground electrode are formed on the magnetic insulating substrate, and a central portion is opened to accommodate a ferrite plate. A non-reciprocal circuit device is obtained by stacking the above electrode substrates.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The nonreciprocal circuit device of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an exploded perspective view showing the basic structure of a nonreciprocal circuit device according to an embodiment of the present invention. This non-reciprocal circuit device is provided with a matching capacitor 5 and a magnetic insulating substrate 4 serving as a grounding substrate in which grounding electrodes 9 and 13 and an input / output electrode 12 are formed on a magnetic insulator, a grounding electrode 9 and an input electrode 9. The output substrate 10 is formed, and the electrode substrate 3 is provided with the matching capacitor setting concave portion 8 at a position corresponding to the matching capacitor 5, and the ferrite accommodated in the circular hole opened in the central portion of the electrode substrate 3. Disk 2
And a central conductor plate 1 are laminated in this order, and a disk-shaped permanent magnet plate 7 and an upper magnetic yoke 6 are covered on the upper part of the laminated body. In this state, the upper magnetic yoke 6 constituting the magnetic circuit is provided with the ground electrode 13 (however, the ground electrode 9 is provided on the plate surface of the magnetic insulating substrate 4 therebelow, while the ground electrode 13 is provided on the plate peripheral edge surface). (Provided) to be closely attached.

Here, the magnetic insulating substrate 4 has a large insulation resistance in place of the conventional lower magnetic yoke, and the magnetic material thereof has a saturation magnetic flux density higher than that of the ferrite material of the ferrite disk 2 and near the operating frequency. (For example, 1.5G
Permeability μ around (Hz) is sufficiently small,
The frequency f _{r at} which the magnetic permeability μ is maximum is set sufficiently smaller than the operating frequency. For example, as the magnetic insulating substrate 4 provided with the ground electrodes 9 and 13 and the input / output electrode 12, the insulation resistance is 1 × 10 ⁶ Ω / m, the saturation magnetic flux density is 2000 Gauss,
An example is the case where a Ni—Zn ferrite having a magnetic permeability μ at a frequency of 1000 MHz is 10 or less is used as the magnetic material.

FIG. 2 shows the dynamic magnetic permeability μ (= μ _r '+ i) with respect to the frequency f of the magnetic material of the magnetic insulating substrate 4.
μ _r ″). Here, the curve C1 and the imaginary part μ relating to the true part μ _r 'including the initial permeability μ _i are shown.
A curve C2 relating to _r ″ (normally involved in magnetic loss) is shown. However, if the curve C2 is noted, the frequency f _{r at} which the magnetic permeability μ becomes maximum with respect to the use center frequency f ₀ becomes sufficiently small. Therefore, the magnetic insulating substrate 4 behaves substantially as a non-magnetic material in the high frequency band which is the operating frequency, and the adverse effect on the loss of the circuit element is avoided.

That is, in the case of this non-reciprocal circuit device, instead of the case provided with the input / output terminal and the ground terminal, which are conventionally required, and the lower magnetic yoke, the magnetic electrodes are connected to the ground electrodes 9 and 13 and the input / output. With the electrode 10 formed,
The magnetic insulating substrate 4 having a large insulation resistance, which substitutes the lower magnetic yoke, is used as a matching capacitance plate. As a result, the number of parts corresponding to the lower magnetic yoke and the case is reduced as compared with the related art, and the structure is simply small and low-profile, and the SMD system can be supported.

[0017]

As described above, according to the nonreciprocal circuit device of the present invention, an insulator having magnetism is used instead of the case having the input / output terminal and the ground terminal and the lower magnetic yoke which are conventionally required. Since the ground electrode and the input / output electrode are formed on, and the lower magnetic yoke is used as a substitute for the magnetic insulating substrate having a large insulation resistance as the ground substrate, the number of parts is reduced, and it is simply configured with a small and low profile. The number of man-hours for automatic assembly is improved to realize cost reduction and SM
It is also possible to support the D method. In addition, the magnetic material of the magnetic insulating substrate has a saturation magnetic flux density higher than that of the ferrite material of the ferrite disk, and the permeability in the vicinity of the operating frequency is sufficiently small to avoid the adverse effect on the loss of the circuit element. Application to communication equipment and mobile communication equipment becomes effective.

[Brief description of drawings]

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

2 shows characteristics of magnetic permeability with respect to frequency regarding a magnetic material of a magnetic insulating substrate used in the nonreciprocal circuit device shown in FIG.

FIG. 3 is an exploded perspective view showing a basic configuration of a conventional non-reciprocal circuit device.

[Explanation of symbols]

 1, 101 central conductor plate 2, 102 ferrite disk 3, 103 electrode substrate 4 magnetic insulating substrate (earth substrate) 5, 105 matching capacitance 6, 106 upper magnetic yoke 7, 107 permanent magnet plate 8, 108 recess for matching capacitance setting 9, 109, 13, ground electrode 10, 110, 12 input / output electrode 104 ground substrate 112 input / output terminal 113 ground terminal 114 lower magnetic yoke

Claims (3)

[Claims] 1. A grounded body, a ferrite plate, and a center conductor plate are laminated in this order to sandwich a laminate between the upper magnetic yoke and the lower magnetic yoke, and the upper magnetic yoke has a direct current on the side. In the nonreciprocal circuit device having a permanent magnet plate for applying a magnetic field, the ground substrate is a magnetic insulating substrate having a large insulation resistance in which an input / output electrode and a ground electrode are formed on a magnetic insulator. A non-reciprocal circuit device, wherein the lower magnetic yoke is substituted. 2. The nonreciprocal circuit device according to claim 1, wherein the magnetic material of the magnetic insulating substrate has a saturation magnetic flux density higher than that of the ferrite material of the ferrite plate, and
A non-reciprocal circuit device having a magnetic permeability that is sufficiently small in the vicinity of the operating frequency. 3. The nonreciprocal circuit device according to claim 1, wherein an input / output electrode and a ground electrode are formed on the magnetic insulating substrate, and a central portion is opened to accommodate the ferrite plate. A non-reciprocal circuit device comprising a stack of electrode substrates.