JPS6226902A - Magnetic device - Google Patents

Abstract

PURPOSE:To obtain a magnetic device setting optimizingly a temperature characteristic of a magnetic field given to plural magnetic resonance elements individually by setting individually the dimension and types of materials of a soft magnetic plate. CONSTITUTION:The device consists of a frame magnetic yoke 1, a couple of magnets 2, 3 arranged oppositely to form a magnetic field in the magnetic yoke 1, plural magnetic resonance elements 6, 7 arranged in the magnetic field formed by a couple of the magnets 2, 3 soft magnetic plates 5A, 5B provided individually to the plural magnetic resonance elements 6, 7 and adjusting screws 10, 11 provided individually to adjust variably the magnetic resistance between a couple of the magnets 2, 3 at a position opposite respectively to the plural magnetic resonance elements 6, 7. The upper soft magnetic plate 4 is used in command and the lower soft magnetic plates 5A, 5B are provided individually to the magnetic resonance elements 6, 7 for example, the thickness is selected independently to set optimizingly the temperature characteristic of the magnetic field individually. Further, the magnetic field at room temperature is adjusted by the adjusting screws 10, 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic device that applies a magnetic field to a magnetic resonance element.

C. Summary of the Invention The present invention relates to a magnetic device that applies a magnetic field to a magnetic resonance element.
A pair of magnets is arranged inside a bar-shaped magnetic yoke to form a magnetic field, a plurality of magnetic resonance elements are arranged within this magnetic field, a separate soft magnetic plate is provided for each of the plurality of magnetic resonance elements, and the magnetic yoke is In addition, different adjusting screws for magnetic resistance adjustment are screwed together corresponding to the plurality of magnetic resonance elements, so that the temperature characteristics of the plurality of magnetic resonance elements can be optimally set individually.

[Conventional technology]

In conventional filters using magnetic resonance elements such as YIG,
Normally, a permanent magnet or electromagnet is used to apply a bias magnetic field to a magnetic resonance element, but for filters with a fixed filtering frequency, permanent magnets are used because they are small and consume no power. It will be done.

However, the present applicant previously applied for patent application No. 59-180941.
In this paper, we proposed a magnetic device that can easily and stably vary the magnetic field applied to multiple magnetic resonance elements. Such a magnetic device will be explained with reference to FIGS. 4 and 5. FIGS. 4 and 5 are a cross-sectional view and a plan view, respectively, of such a magnetic device. (1) is a frame-shaped magnetic cork with upper and lower magnetic yokes half-open (IA).

(IB). (2) and (3) are a pair of plate-shaped permanent magnets, and the upper and lower inner surfaces 6:t of the magnetic yoke (1)
r: It is installed so as to face the . Soft magnetic plates (4) and (5) made of soft magnetic ferrite or the like are laminated on top of these magnets (2) and (3), respectively. The soft magnetic plates (4) and (5) are magnets (2),
By superimposing the temperature characteristics of the magnetization of (3) and the soft magnetic plates (4) and (5), the temperature characteristics of the magnetic field can be designed to match the temperature characteristics of the magnetic resonance element, which will be described later, and the resonance frequency can be adjusted. This is to compensate for temperature dependence and make the resonance frequency constant over a wide temperature range.

A ferromagnetic thin film filter (YIG filter) (I2) having a plurality of magnetic resonance elements (for example, YIG elements>(6), (7)) is disposed within this magnetic yoke (1). ) and (18), a support plate (9) made of brass is fixed with screws, and a high frequency circuit board (8) is mounted on it.This high frequency circuit board (
8), disc-shaped magnetic resonance elements (6) and (7) are provided. (13).

(14) is an input/output microstrip line formed on the high frequency circuit board (8).

However, the magnetic yoke (
At the top of 1), a magnetic resonance element (6).

Female screws (la) and (lb) are formed opposite to (7), and there are soft magnetic adjustment screws (10) and (11) made of iron or the like made of the same material as the magnetic yoke (1) (male screws). Screw them together. And these screws (1,0),
Insert a screwdriver into the grooves (10a) and (llb) of (11), adjust the rotation of the screws (10) and (11) separately, and remove the magnet (2) and magnetic yoke (], ').
variably adjust the magnetic resistance between the magnetic resonance elements (6);
(7) The bias magnetic field applied to each field is variably adjusted to make them equal (or different).

In the magnetic apparatus shown in FIGS. 4 and 5, the magnet (2),
(3) does not move and the gap between them does not change, so the magnetic resonance element (6).

The magnetic field applied to (7) can be easily and stably varied, and there is no risk of adversely affecting high frequency characteristics such as isolation of the high frequency circuit board (8). Also, each screw (10), (1
By rotating 1), the magnetic resonance element (6),
(7) The resonant frequency of the helmet and filter (1) can be adjusted independently.
The characteristic of 2) becomes good, and it is up to you to find the best point of the filter characteristic.

Problems to be solved by the invention C] In such a magnetic device, a plurality of magnetic resonance elements (6)
, (7), the soft magnetic plates (4), (, 5) are common, so it was not possible to optimally set the temperature characteristics of each magnetic resonance element (6), (7).

In other words, the resonance frequency of the magnetic resonance elements (6), (7) at room temperature is determined by the strength of the magnetic field applied to them and the amount of saturation magnetization of the magnetic resonance elements (6), (7) themselves. Variations in these constants due to variations in the material of the resonant element and the characteristics of the magnet can be compensated for by adjusting the adjustment screws (10) and (1).
By adjusting 1), it can be adjusted to a considerable extent.

However, since the soft magnetic plates (4) and (5) are common to each magnetic resonance element (6) and (7), the temperature characteristics of the magnetic field applied to each magnetic resonance element (6) and (7) are optimized separately. It was not possible to set it to .

In view of this point, the present invention seeks to propose a magnetic device that can optimally set the temperature characteristics of the magnetic field applied to a plurality of magnetic resonance elements individually.

[Means for solving problems]

The magnetic device according to the present invention includes a frame-shaped magnetic yoke (1),
This magnetic yoke (1) is arranged within this magnetic yoke (1).
) a pair of magnets (2), (3) arranged opposite each other so as to form a magnetic field within the magnets (2),
A plurality of magnetic resonance elements (6) arranged in the magnetic field formed by (3).

(7), a plurality of magnetic resonance elements (6), soft magnetic plates (5^), (5B) provided separately for (7), and a plurality of soft magnetic plates (5^), (5B) provided separately for the magnetic resonance elements (6), (7), and a plurality of separate adjustment screws (10) and (11) for variably adjusting the magnetic resistance between the pair of magnets (2) and (3) at positions facing the magnetic resonance elements (6) and (7), respectively; It has the following.

[Effect]

According to the present invention, the soft magnetic plates (5A), (5
By setting the dimensions, materials, etc. of B> separately, the temperature characteristics of the strength of the magnetic field applied to the magnetic resonance elements (6) and (7) can be set optimally for each.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1. Since most of the configuration is the same as the magnetic device illustrated in FIGS. 4 and 5 above, The same reference numerals are given to the parts corresponding to those in FIG. 4, and redundant explanation will be omitted.

In this example, although the upper soft magnetic plate (4) is common,
The lower soft magnetic plate is a magnetic resonance element (6).

(7), (5A) and (5B) are provided separately, for example, their thicknesses are set independently, and the magnetic resonance element (6
) and (7), the temperature characteristics of the magnetic field applied to each are set optimally. Incidentally, the upper soft magnetic plate (4) can also be provided independently for each of the magnetic resonance elements (6) and (7).

Further, the magnetic field applied to each magnetic resonance element (6), (7) at room temperature can be adjusted using an adjustment screw (10).

This can be done by adjusting (11).

Figure 2 shows the temperature T ('C) at the resonance frequency f of the magnetic resonance element.
Characteristic curves are shown. θ indicates a first-order temperature coefficient, and h indicates a second-order temperature coefficient. As described above, by changing the thickness of the soft magnetic plate, the primary temperature coefficient θ can be changed. Furthermore, the secondary temperature coefficient can be changed by changing the characteristics of the materials of the magnet, soft magnetic plate, and magnetic resonance element.

Next, an example of a ferromagnetic thin film filter suitable for application to the above-described magnetic device will be described with reference to FIG. (21) is a quartz substrate serving as a dielectric substrate (high frequency circuit board), and a ground conductive layer (22) is formed on the back side of the quartz substrate in a manner similar to the front side. Input and output side microstrip lines (conductive N) (23) and (24) are deposited parallel to each other near both sides of the surface of this quartz substrate (21), and one end of each of the opposite sides is formed parallel to each other. It will be released. (23A
), (24A) is the strip line (23)
, (24) are each open end. A YTG disk (25) was formed using photolithography from a YrG thin film grown on a GGG (gadolinium gallium garnet) substrate (27) by liquid phase epitaxial method.
(26), each YIG disk (25),
(26) on the input and output side microstrip lines (
23), the open end (23A) above (24),
(24A) Snow falls closely at a position a specific distance away, which will be described later. On this GGG board (27), YIG
Input and output side strip lines (23>) are opposite to the disks (25) and (26).

A connecting microstrip line (28) is formed so as to intersect with (24), and both ends thereof are open. (
28A) and (28B) are strip lines (
28).

And the open ends (23A), (24A) of the strip lines (23), (24) and (28)
) and (28A).

(28B) YIG disks (25) and (26), respectively
The lengths from the center of both are selected to be an odd multiple of approximately 1/4 of the propagation wavelength λ of the signal in the passband.

Next, the operation of such a filter will be explained. When a high frequency signal with a propagation wavelength of λ is supplied to the input strip line (23), the high frequency signal propagates to its open end (23A), but at the open end, the voltage is maximum and the current is minimum (zero).
, the magnetic field becomes minimum (zero).

On the other hand, since the length from the open end (23A) to the YIG disk (25) is selected as described above, at the center position of the YIG disk (25), the voltage is minimum (zero) and the current is maximum, the magnetic field is maximum. Therefore, this YIG disk (25
), the stripline (23) and YIG
The high frequency coupling efficiency due to the magnetic field between the disk (25) is maximized, and the capacitive coupling degree due to the voltage bone between the strip line (23) and the connecting strip line (28) is minimized, so that the Itsuresion is adopted. It will be done.

Furthermore, when a high frequency signal whose wavelength is significantly different from λ is supplied to the input stripline (23), the degree of capacitive coupling between the stripline (23) and the connecting stripline (28) is the same value. Therefore, isolation is not required. .

Therefore, if a bias DC electric field perpendicular to the surface of the YTG disk (25) is applied, ferrimagnetic resonance will occur at a certain frequency f, and when this frequency f is isolated, f will be A filter with a center frequency is obtained. In addition, the strip line (28) and the YIG disc (2
8) and the output side stripline (24).

Such a filter has a high Q when used in the microwave band, and the resonant frequency can be varied linearly over a wide band by varying the strength of the bias magnetic field regardless of the volume of the ferromagnetic material, making it easy to mass-produce. is high, and there is little variation in characteristics.
It can be made without adjustment and is inexpensive.

〔Effect of the invention〕

According to the present invention, the temperature characteristics of a plurality of magnetic resonance elements can be optimally set individually.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of a magnetic device according to the present invention, FIG. 2 is a temperature characteristic curve diagram of a magnetic resonance element, and FIG. 3 is a perspective view showing an example of a filter suitable for the present invention. 4 and 5 are a sectional view and a plan view, respectively, of a conventional magnetic device. (1) is the magnetic yoke, (IA) is the yoke part, (2),
(3) is a magnet, (4), (5A), (
5B> is a soft magnetic plate, (6) and (7) are magnetic resonance elements, and (10) and (11) are adjustment screws.

Claims (1)

[Scope of Claims] A frame-shaped magnetic yoke; a pair of magnets disposed within the magnetic yoke and facing each other so as to form a magnetic field within the magnetic yoke; and a magnetic yoke formed by the pair of magnets. a plurality of magnetic resonance elements disposed in a magnetic field; a soft magnetic plate provided separately for each of the plurality of magnetic resonance elements; and a soft magnetic plate for each of the plurality of magnetic resonance elements screwed to the magnetic yoke. A magnetic device comprising separate adjustment screws for variably adjusting the magnetic resistance between the pair of magnets at opposing positions.