# US 5,345,204 A · Magnetostatic wave resonator having at least one ring conductor

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- Number: US 5,345,204 A
- Document ID: US5345204A
- Status: Granted
- Kind: A
- Application number: 08/014,433
- Filed: 1993-02-05
- Granted: 1994-09-06
- Earliest claimed: 1992-02-12
- Assignees: Murata Manufacturing Co., Ltd.
- Inventors: Takekazu Okada; Satoru Shinmura; Fumio Kanaya
- Web page: https://patentgrep.com/patent/US5345204A

## CPC

- H03H 2/001: {comprising magnetostatic wave network elements}
- H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)

## Abstract

A magnetostatic wave resonator includes a YIG thin film. On one main surface of the YIG thin film, three circular conductors having different radii are disposed on concentric circles whose centers are the center of the YIG thin film. Furthermore, on the YIG thin film, two transducers are disposed so as to intersect with each other at right angles at the center of the YIG thin film and to connect magnetically to the YIG thin film.

## Claims

### Claim 1

A magnetostatic wave resonator comprising:
a ferrimagnetic base;
at least one ring conductor formed on one main surface of said ferrimagnetic base; and
at least two transducers that intersect one another on said one main surface of said ferrimagnetic base and coupled magnetically to said ferrimagnetic base for exciting a magnetostatic wave in said ferrimagnetic base having a main mode and a higher mode standing wave, and for receiving said magnetostatic wave, whereby said higher mode standing wave has an anti-node;
said ring conductor being positioned at said anti-node.

### Claim 2

A magnetic wave resonator comprising:
a ferrimagnetic base;
a plurality of said ring conductors formed on one main surface of said ferrimagnetic base, said ring conductors being coaxial and radially spaced, and
at least two transducers that intersect one another on said one main surface of said ferrimagnetic base and coupled magnetically to said ferrimagnetic base.

### Claim 3 (depends on 1)

A magnetostatic wave resonator according to claim 1, wherein said ferrimagnetic base is a YIG thin film.

### Claim 4 (depends on 3)

A magnetostatic wave resonator according to claim 3, wherein said YIG thin film is formed on one main surface of a GGG substrate.

### Claim 5

A magnetostatic wave resonator comprising:
a ferrimagnetic base;
at least one ring conductor formed on one main surface of said ferrimagnetic base; and
at least two transducers that intersect one another on said one main surface of said ferrimagnetic base and coupled magnetically to said ferrimagnetic base;
said ferrimagnetic base being formed on one main surface of a GGG substrate, and
further comprising a ring conductor formed on the other main surface of said GGG substrate.

### Claim 6 (depends on 5)

A magnetostatic wave resonator according to claim 5, wherein a plurality of said ring conductors are respectively formed on one main surface of said ferrimagnetic base and said other main surface of said GGG substrate, said ring conductors on each of said one main surface of said ferrimagnetic base and said other main surface being coaxial and radially spaced apart.

### Claim 7 (depends on 5)

The magnetostatic wave resonator according to claim 5, wherein said ferrimagnetic base is a YIG thin film.