JP3134481B2 - Magnetostatic wave device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetostatic wave device, and more particularly to a ferrimagnetic element such as a YIG (yttrium, iron, garnet) element, a magnet for applying a magnetic field to the ferrimagnetic element, and a ferrimagnetic element. And a transducer provided in connection with the magnetic element.

[0002]

2. Description of the Related Art FIG. 13 is an illustrative sectional view showing an example of a conventional magnetostatic wave device disclosed in Japanese Utility Model Application No. 1-148370 (Japanese Utility Model Application Laid-Open No. 3-86601) and which is the background of the present invention. The magnetostatic wave device 1 includes a housing 2 made of metal, and a dielectric substrate 3 made of, for example, alumina is provided in the housing 2 in the middle of the height direction. On the lower surface of the dielectric substrate 3, for example, a strip-shaped YIG element 4
And a ground plate 5 is provided below the YIG element 4. In addition, two transducers (not shown) are provided on the upper surface of the dielectric substrate 3 at an interval. These transducers are respectively connected to two coaxial connectors (not shown) penetrating the side wall of the housing 2.

Further, magnets 6a and 6b for applying a DC magnetic field to the YIG element 4 are provided in the housing 2 so as to sandwich the dielectric substrate 3 and the like. In the magnetostatic wave device 1, for example, when a signal is input to one coaxial connector and a signal is applied to one transducer, the signal is excited as a volume forward magnetostatic wave (MSFVW). Then, the volume-advancing magnetostatic wave is propagated to the other transducer side on the YIG element 4, received by the transducer, and output as a signal from the other coaxial connector.

The magnetostatic wave device 1 has a housing 2
The two adjustment screws 7a and 7b are screwed to the upper wall of. These adjusting screws 7 a and 7 b are for adjusting the distribution of the magnetic field applied to the YIG element 4.
Further, another adjustment screw 8 is screwed to the lower wall of the housing 2, and another magnet 9 is fixed to a tip of the adjustment screw 8. These adjusting screw 8 and magnet 9 are YIG
This is for changing the magnitude of the magnetic field applied to the element 4 to change the frequency characteristics of the magnetostatic wave device 1.

[0005]

However, in the magnetostatic wave device 1, the distance between the two magnets 6a and 6b and the housing 2
The spacing between the magnets 6a and the magnets 6a must be maintained at predetermined intervals, and it is difficult to position the YIG element, the magnets, and the transducers, resulting in poor workability and productivity during assembly.

Therefore, the present inventor has proposed a ferrimagnetic element,
It has been proposed that magnets and transducers be housed in a metal holder to facilitate positioning, but this would add to the overall weight.

SUMMARY OF THE INVENTION It is, therefore, a primary object of the present invention to provide a magnetostatic wave device which can easily and accurately position a ferrimagnetic element, a magnet, and a transducer and is lightweight.

[0008]

A magnetostatic wave device according to the present invention comprises a ferrimagnetic element, a magnet for applying a magnetic field to the ferrimagnetic element, and a transducer provided in association with the ferrimagnetic element. A magnetic wave device,
A ferrimagnetic element storage section for storing a ferrimagnetic element, a magnet storage section for storing a magnet in a predetermined position with respect to the ferrimagnetic element, and a transducer in a predetermined position with respect to the ferrimagnetic element. Including a holder made of synthetic resin having a transducer housing for
It is a magnetostatic wave device.

[0009]

The ferrimagnetic element accommodating portion of the holder accommodates the ferrimagnetic element. Also, in the magnet storage part of the holder,
The magnet is housed. In this case, the magnet is housed at a predetermined position with respect to the ferrimagnetic element. Further, the transducer is housed in the transducer housing portion of the holder. In this case, the transducer is housed at a predetermined position with respect to the ferrimagnetic element.

[0010]

According to the present invention, a magnetostatic wave device which can easily and accurately position a ferrimagnetic element, a magnet and a transducer can be obtained. Therefore, the magnetostatic wave device according to the present invention has good workability and productivity during assembly. Moreover, according to the present invention, since the holder is made of a synthetic resin, compared with the case of using a metal holder,
The magnetostatic wave device becomes lighter.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0012]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. 1 in an assembled state of the embodiment shown in FIG. The magnetostatic wave device 10 includes, for example, a rectangular plate-shaped holder 12 made of a synthetic resin.

The holder 12 has, for example, a recess 14 having a rectangular shape as a plane as a magnet storage portion. This recess 14
The lower surface of the holder 12 has an opening.

On the upper surface of the holder 12, for example, a rectangular recess 16 is formed as a ferrimagnetic element housing portion. The recess 16 is formed in a rectangular shape so as to extend on one diagonal line of the holder 12. On the bottom surface of the concave portion 16 of the holder 12, two positioning convex portions 18a are provided at one end, the center and the other end of the longitudinal direction at predetermined intervals in the width direction. It is formed. Further, two positioning projections 18b are formed at one end and the other end of the bottom surface of the recess 16 in the longitudinal direction, respectively. In addition, through holes 20 are formed at one end and the other end in the longitudinal direction of the bottom of the concave portion 16, respectively.

Further, on the upper surface of the holder 12, for example, two rectangular concave portions 2 are provided as transducer housing portions.
2a and 22b and two bent concave portions 24a and 24b are formed shallower than the concave portions 16 so as to communicate with the concave portions 16, respectively. In this case, the recesses 22a and 24a are formed at one end and the other end in the width direction on one end side of the recess 16 in the longitudinal direction. The bent concave portion 24 a is formed over one side surface of the holder 12. Similarly, recesses 22b and 24
b is formed at the other end and one end in the width direction on the other end side in the longitudinal direction of the concave portion 16. The recess 24b is formed over the other side surface of the holder 12.

Also, two through holes 26a are formed at the bottom of the rectangular recess 22a, and two through holes 26b are also formed at the bottom of the rectangular recess 22b.

An earth conductor layer 28 is formed on the entire surface of the holder 12 by plating a conductor such as gold.

A magnet 30 is provided in the recess 14 of the holder 12.
Is stored and fixed.

In the recess 16 on the upper surface of the holder 12,
As a ferrimagnetic element, for example, a strip-shaped YIG element 32
Is stored. In this case, the YIG element 32 is positioned by the six protrusions 18a and the four protrusions 18b.

Further, the concave portions 22a, 22 of the holder 12
b, 24a and 24b house two transducers 34a and 34b. That is, transducers 34a and 34b are formed of substantially J-shaped dielectric substrates 36a and 36 made of a dielectric such as alumina.
6b is formed on one main surface. And
One dielectric substrate 36a is fitted into concave portions 22a and 24a of holder 12, and the other dielectric substrate 36b is fitted into concave portions 22b and 24b. Therefore, the transducers 34a and 34b have Y
It crosses the vicinity of one end and the vicinity of the other end of the IG element 32, respectively.

At one ends of the transducers 34a and 34b and the dielectric substrates 36a and 36b, through holes 38a and 38b are formed corresponding to the through holes 26a and 26b of the holder 12, respectively. . One end of each of the transducers 34a and 34b is connected to these through holes 26a and 26a.
6b, 38a and 38b are connected to the ground conductor layer 28.

Further, a thin plate 40 made of a conductor such as copper is fixed to the upper surface of the holder 12 as a ground conductor. In this case, since the transducers 34a and 34b are provided in the concave portions on the upper surface of the holder 12, the thin plate 4
0 does not contact transducers 34a and 34b.

Further, if necessary, the holder 12 is housed in, for example, a metal case (not shown), and the other ends of the two transducers 34a and 34b are connected to two coaxial terminals as input / output terminals passing through the metal case. Each is connected to a center conductor of a connector (not shown). In addition, the outer conductor of these coaxial connectors is via a metal case,
It is connected to the ground conductor layer 28.

In the magnetostatic wave device 10, the magnet 30, the YIG element 32, and the transducer 3 are held by the holder 12.
4a and 34b can be easily and accurately positioned. Therefore, the magnetostatic wave device 10 has good workability and productivity during assembly.

Moreover, in the magnetostatic wave device 10, since the holder 12 is formed of a synthetic resin, it is lighter in weight than a device using a metal holder.

In the magnetostatic wave device 10, a thin plate 40 made of a conductor is provided in the vicinity of the two transducers 34a and 34b, and the recess 16 becomes a cut-off waveguide in the operating frequency range.
A so-called direct wave that directly reaches one from a and 34b to the other is suppressed.

Further, in the magnetostatic wave device 10, the magnet 3
0, YIG element 32, transducers 34a and 3
4b is integrated, and the number of parts is reduced.

FIG. 3 is an exploded perspective view showing another embodiment of the present invention, and FIG. 4 is a sectional view taken along line IV-IV of FIG. 3 in an assembled state of the embodiment shown in FIG. In this embodiment, in particular, in the holder 12, two raised portions 12a and 12b are formed at one end and the other end in the longitudinal direction of the concave portion 16, respectively. The upper surface of the one protruding portion 12a is formed to be flat with the bottom surfaces of the concave portions 22a and the concave portions 24a as the transducer accommodating portions.
Further, the upper surface of the other raised portion 12b is formed flat with the bottom surfaces of the concave portions 22b and the concave portions 24b as the transducer accommodating portions. In the holder 12, no convex portion or through hole for positioning the YIG element 32 is formed at the bottom of the concave portion 16.

In this embodiment, the ground conductor layer 28
Is formed on almost the entire surface of the holder 12,
4, the bottoms of the recesses 16, 22 a, 22 b, 24 a and 24 b, and the portions near the recesses 24 a and 24 b on one side and the other side of the holder 12.

Further, the transducers 34a and 34a
4b is formed together with the ground conductor layer 28 by plating a conductor such as gold on the upper surfaces of the raised portions 12a and 12b of the holder 12 and the bottom surfaces of the concave portions 22a, 22b, 24a and 24b.

In the recess 14 of the holder 12, a YIG element 32 as a ferrimagnetic element, another thin plate 42 made of a conductor such as copper as a ground conductor, and a magnet 30 are housed and fixed. In this case, a number of convex portions (not shown) similar to the convex portions 18a and 18b in the embodiment shown in FIGS. 1 and 2 are formed on the upper surface of the concave portion 14 of the holder 12, and the YIG element 32 Are positioned by these convex portions, or are bonded by, for example, an adhesive. Of course, by using these convex portions and the adhesive together,
The positioning and fixing of the IG element 32 may be performed.

In the embodiment shown in FIGS. 3 and 4, the magnet 12, the YIG element 32, and the transducers 34a and 34b can be easily and accurately positioned by the holder 12, so that workability during assembly and production can be improved. Good nature. Moreover, also in this embodiment, since the holder 12 is formed of a synthetic resin, the weight is reduced as compared with the case where a holder made of metal is used. Further, in this embodiment, the two thin plates 40 and 42 made of a conductor further suppress direct waves from one transducer to the other transducer. Further, also in this embodiment, the number of parts is reduced.

FIG. 5 is an exploded perspective view showing still another embodiment of the present invention, and FIG. 6 is a sectional view taken along line VI-VI of FIG. 5 in an assembled state of the embodiment shown in FIG. In this embodiment, in particular, in the holder 12, one end, the center and the other end in the longitudinal direction of the bottom of the recess 16 are opened so as to communicate with the recess 14. That is, the holder 12 has two bridge portions 13a and 13b crossing the concave portion 16. The upper surfaces of the bridge portions 13a and 13b are provided with concave portions 22a and 22
b, 24a and 24b are formed flat with the bottom surface. The lower surfaces of the bridge portions 13a and 13b are formed above the upper surface of the concave portion 14 by the thickness of the YIG element 32.

The ground conductor layer 28 is provided on the holder 12 with the surfaces of the bridge portions 13a and 13b and the concave portion 22a.
a, 22b, 24a and 24b are formed on the surface excluding the bottom surface and the portions near the concave portions 24a and 24b on one side surface and the other side surface.

Further, the transducers 34a and 34a
4b is formed together with the ground conductor layer 28 by plating a conductor such as gold on the upper surfaces of the bridge portions 13a and 13b of the holder 12 and the bottom surfaces of the concave portions 22a, 22b, 24a and 24b.

In the recess 14 of the holder 12, a YIG element 32 as a ferrimagnetic element, another thin plate 42 made of a conductor such as copper as a ground conductor, and a magnet 30 are housed and fixed.

In the embodiment shown in FIGS. 5 and 6, the magnet 12, the YIG element 32, and the transducers 34a and 34b can be easily and accurately positioned by the holder 12, so that the workability and the production at the time of assembly can be improved. Good nature. Moreover, also in this embodiment, since the holder 12 is formed of a synthetic resin, the weight is reduced as compared with the case where a holder made of metal is used. Also in this embodiment, the two thin plates 40 and 42 made of a conductor further suppress direct waves from one transducer to the other transducer. Further, also in this embodiment, the number of parts is reduced.

FIG. 7 is a perspective view showing another embodiment of the present invention. FIG. 8 is a plan view of the embodiment shown in FIG.
FIG. 9 is a sectional view taken along line IX-IX in FIG. 8. In this embodiment, in particular, substantially J-shaped concave portions 23a and 23b are respectively formed as transducer housing portions on the upper surface of the holder 12 over one end and the other end thereof. Further, as shown in FIG. 10 and the like, two through holes 26a and 26b are formed in the holder 12 at one end of the concave portions 23a and 23b, respectively.

Further, in the holder 12, between the recess 14 and the recesses 23a and 23b, a rectangular insertion portion 17 as a ferrimagnetic element storage portion is arranged so as to cross the recesses 23a and 23b in plan view. Formed.
The insertion portion 17 is formed to extend on one diagonal line of the holder 12 and has an opening on a side surface of the holder 12. The holder 12 has a number of positioning projections 18 a and 18 b formed in the insertion portion 17. Further, as shown in FIG. 10 and the like, through holes 20 are formed in the holder 12 at one end, the middle and the other end in the longitudinal direction of the bottom of the insertion portion 17, respectively.

Then, in this holder 12, the recess 2
An earth conductor layer 28 is formed on the surface excluding the bottom surfaces of 3a and 23b and the upper surface and side surfaces of insertion portion 17. Note that the transducers 34a and 34b are
The ground conductor layer 2 is formed by plating a conductor such as gold on the bottom surfaces of the recesses 23a and 23b.
8 are formed. In this case, since the ground conductor layer 28 is also formed in many through holes 20, the inductance generated by the ground conductor layer 28 can be reduced.

In the insertion portion 17 of the holder 12, a strip-shaped YIG element 32, for example, as a ferrimagnetic element is inserted and fixed. In this case, the YIG element 32 is positioned by the large number of projections 18a and 18b. Note that the length, width and height of the insertion portion 17 are
If these are formed in accordance with
b becomes unnecessary.

Further, on the upper surface of the holder 12, a thin plate (not shown) made of a conductor such as copper is provided as an earth conductor.

Also in this embodiment, the magnet 30, the YIG element 3
2 and the transducers 34a and 34b can be easily and accurately positioned, and are lighter in weight than those using a metal holder. Further, also in this embodiment, the direct wave between the transducers is suppressed, and the number of components is reduced.

FIG. 11 is a perspective view showing a modification of the embodiment shown in FIG. 7, and FIG. 12 is a plan view of the embodiment shown in FIG. In the embodiment shown in FIGS. 11 and 12, the insertion portion 17 serving as the ferrimagnetic element storage portion is opened at the center of the upper surface of the holder 12 as compared with the embodiment shown in FIG.

In the embodiment shown in FIGS. 11 and 12, the magnet 30, the YIG element 32 and the transducer 34a
And 34b can be easily and accurately positioned and light in weight. Further, direct waves between the transducers are suppressed, and the number of components is reduced.

In each of the above-described embodiments, the YIG element 32 as a ferrimagnetic element is disposed between the magnet 30 and the transducers 34a and 34b. The holder may be configured so as to be disposed between them.

In the above-described embodiment, the magnet is arranged only on one side of the ferrimagnetic element. However, in the present invention, the holder is configured such that the magnet is arranged on both sides of the ferrimagnetic element. Is also good.

Further, in each of the above embodiments, the holder 1
2. Although the concave portion 14 and the magnet 30 as the magnet storage portion are formed in a rectangular shape, they may be formed in a circular shape, for example, and their shapes may be arbitrarily changed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention.

2 is a sectional view taken along line II-II of FIG. 1 in an assembled state of the embodiment shown in FIG. 1;

FIG. 3 is an exploded perspective view showing another embodiment of the present invention.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3 in an assembled state of the embodiment shown in FIG. 3;

FIG. 5 is an exploded perspective view showing still another embodiment of the present invention.

6 is a sectional view taken along line VI-VI of FIG. 5 in an assembled state of the embodiment shown in FIG. 5;

FIG. 7 is a perspective view showing another embodiment of the present invention.

FIG. 8 is a plan view of the embodiment shown in FIG. 7;

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

FIG. 10 is a perspective view of a holder used in the embodiment shown in FIG. 7 as viewed from below.

FIG. 11 is a perspective view showing a modification of the embodiment shown in FIG. 7;

FIG. 12 is a plan view of the embodiment shown in FIG. 11;

FIG. 13 is an illustrative sectional view showing an example of a conventional magnetostatic wave device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Magnetostatic wave device 12 Holder 14, 16, 22a, 22b, 24a, 24b Concave part 30 Magnet 32 YIG element 34a, 34b Transducer

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Fumio Kanaya 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Murata Manufacturing Co., Ltd. (56) References Patent 2595830 (JP, B1) (58) Investigated Field (Int.Cl. ⁷ , DB name) H01P 1/215-1/218

Claims (1)

(57) [Claims] 1. A magnetostatic wave device comprising: a ferrimagnetic element; a magnet for applying a magnetic field to the ferrimagnetic element; and a transducer provided in association with the ferrimagnetic element. A ferrimagnetic element accommodating section for accommodating, a magnet accommodating section for accommodating the magnet at a predetermined position with respect to the ferrimagnetic element, and accommodating the transducer at a predetermined position with respect to the ferrimagnetic element Magnetostatic wave device including a holder made of a synthetic resin having a transducer housing portion for use.