# US 2026/0074409 A1 · Microwave resonator and applications thereof

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- Number: US 2026/0074409 A1
- Document ID: US20260074409A1
- Status: Published application
- Kind: A1
- Application number: 19/325,593
- Filed: 2025-09-11
- Published: 2026-03-12
- Earliest claimed: 2024-09-11
- Assignees: Technion Research & Development Foundation Limited
- Applicants: Technion Research & Development Foundation Limited
- Inventors: Aharon BLANK
- Web page: https://patentgrep.com/patent/US20260074409A1

## CPC

- H01P 7/10: Dielectric resonators
- G01R 33/26: using optical pumping
- H01P 7/06: Cavity resonators
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

A microwave resonator comprises a metallic structure formed with a cavity defining a symmetry axis, a pair of diamonds positioned at top and bottom ends of the cavity, and a layered dielectric structure between the diamonds. A microwave magnetic field is generated perpendicularly to the symmetry axis of the cavity in response to a static magnetic field and an excitation optical field, both directed parallel to the symmetry axis.

## Claims

### Claim 1

A microwave resonator for a microwave source system, comprising a metallic structure formed with a cylindrical cavity defining a symmetry axis and having a top end and a bottom end, a pair of cylindrical diamonds positioned in said cavity at said top and bottom ends, and a layered dielectric structure between said diamonds;
wherein a microwave magnetic field is generated perpendicularly to said symmetry axis in response to a static magnetic field and an excitation optical field directed parallel to said symmetry axis.

### Claim 2 (depends on 1)

The microwave resonator according to claim 1, wherein said layered dielectric structure comprises a core layer made of a first dielectric between two layers made of a second dielectric.

### Claim 3 (depends on 2)

The microwave resonator according to claim 2, wherein said first dielectric is a single crystal.

### Claim 4 (depends on 2)

The microwave resonator according to claim 2, wherein said second dielectric is a single crystal.

### Claim 5 (depends on 2)

The microwave resonator according to claim 2, wherein said first dielectric comprises Al2O3.

### Claim 6 (depends on 2)

The microwave resonator according to claim 2, wherein said second dielectric is a perovskite.

### Claim 7 (depends on 6)

The microwave resonator according to claim 6, wherein said second dielectric comprises LaAlO3.

### Claim 8 (depends on 1)

The microwave resonator according to claim 1, comprising an elongated dielectric insert, movable along a radial direction perpendicularly to said symmetry axis.

### Claim 9 (depends on 2)

The microwave resonator according to claim 2, comprising an elongated dielectric insert, movable along a radial direction perpendicularly to said symmetry axis.

### Claim 10 (depends on 9)

The microwave resonator according to claim 9, wherein said insert is made of said first dielectric.

### Claim 11 (depends on 8)

The microwave resonator according to claim 8, wherein said insert is shaped as a rod.

### Claim 12 (depends on 1)

The microwave resonator according to claim 1, wherein each of said diamonds has a have [1 1 1] orientation.

### Claim 13 (depends on 1)

The microwave resonator according to claim 1, wherein each of said diamonds has paramagnetic defects.

### Claim 14 (depends on 13)

The microwave resonator according to claim 13, wherein said paramagnetic defects comprise nitrogen impurities.

### Claim 15 (depends on 14)

The microwave resonator according to claim 14, wherein a concentration of said nitrogen impurities is from about 3 ppm to about 20 ppm.

### Claim 16 (depends on 1)

The microwave resonator according to claim 1, wherein dimensions of the cavity and said diamonds are is selected such that a filling factor associated with said microwave magnetic field is at least 0.7.

### Claim 17 (depends on 1)

A microwave source system comprising the microwave resonator according to claim 1.

### Claim 18 (depends on 17)

The system according to claim 17, comprising a magnet having magnetic poles generating said static magnetic field, wherein a distance between said poles and said diamonds is less than 25 mm.

### Claim 19 (depends on 17)

The system according to claim 17, comprising light sources outside said cavity, wherein a distance between said light sources and said diamonds is less than 5 mm.

### Claim 20 (depends on 17)

The system according to claim 17, serving as a component in an appliance system selected from the group consisting of a microwave interferometry system, a navigation system, a communication system, a radar system, an imaging system, an ablation system, and a microwave radiometer.