# US 12,601,682 B2 · Open resonator

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- Number: US 12,601,682 B2
- Document ID: US12601682B2
- Status: Granted
- Kind: B2
- Application number: 18/426,362
- Filed: 2024-01-30
- Published: 2024-05-23
- Granted: 2026-04-14
- Earliest claimed: 2021-12-14
- Assignees: EM labs, Inc.
- Applicants: EM labs, Inc.
- Inventors: Yoshiyuki Yanagimoto
- Web page: https://patentgrep.com/patent/US12601682B2

## CPC

- G01N 21/59: Transmissivity (G01N21/25 takes precedence)
- G01N 22/00: Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more (G01N3/00 - G01N17/00, G01N24/00 take precedence)
- G01N 2201/068: Optics, miscellaneous
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

An open resonator capable of measuring dielectric characteristic of a sample having anisotropy in a dielectric constant with high accuracy. The open resonator includes two spherical reflection mirrors respectively having two reflection spherical surfaces which are arranged to face each other; and a signal injection portion for inputting an input signal used for measuring a dielectric characteristic of a sample arranged between the two reflection spherical surfaces. At least one of the two spherical reflection mirrors has a groove formed along at least one of the two reflection spherical surfaces of the at least one of the two spherical reflection mirrors.

## Claims

### Claim 1

An open resonator comprising:
two spherical reflection mirrors respectively having two reflection spherical surfaces which are arranged to face each other; and
a signal injection portion for inputting an input signal used for measuring a dielectric characteristic of a sample arranged between the two reflection spherical surfaces, wherein
at least one of the two spherical reflection mirrors has a groove formed along at least one of the two reflection spherical surfaces of the at least one of the two spherical reflection mirrors.

### Claim 2 (depends on 1)

The open resonator according to claim 1, wherein
the groove is formed in a direction substantially same as a direction of an electric field of the input signal.

### Claim 3 (depends on 1)

The open resonator according to claim 1, wherein
an angle between a formation direction of the groove and a direction of an electric field of the input signal inputted from the signal injection portion is 30 degrees or less.

### Claim 4 (depends on 1)

The open resonator according to claim 1, wherein
the groove is arranged in parallel with a plane passing through a central axis connecting centers of the two reflection spherical surfaces.

### Claim 5 (depends on 1)

The open resonator according to claim 1, wherein
the groove is arranged along a plane passing through a central axis connecting centers of the two reflection spherical surfaces.

### Claim 6 (depends on 1)

The open resonator according to claim 1, wherein
each of the two spherical reflection mirrors has a coupling hole at a center of each of the two reflection spherical surfaces,
the groove is arranged to separate from the coupling hole at a predetermined interval, and
the groove is arranged axially symmetrically with respect to the central axis or plane-symmetrically with respect to a plane passing through the central axis.

### Claim 7 (depends on 1)

The open resonator according to claim 1, wherein
a depth of the groove is more than or equal to one-eighth of a wavelength of a measurement frequency and less than a half of the wavelength of the measurement frequency.