# US 2021/0344094 A1 · Single-layer cross-coupled filter

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2021/0344094 A1
- Document ID: US20210344094A1
- Status: Published application
- Kind: A1
- Application number: 17/377,748
- Filed: 2021-07-16
- Published: 2021-11-04
- Earliest claimed: 2019-01-17
- Assignees: Rosenberger Technology Co., Ltd.
- Applicants: Rosenberger Technology Co., Ltd.
- Inventors: Dunrong LI; Renhu LUO; Ze YIN; Jian LU
- Web page: https://patentgrep.com/patent/US20210344094A1

## CPC

- H01P 1/2053: {the coaxial cavity resonators being disposed parall to each other}
- H01P 1/20381: {Special shape resonators}
- H01P 7/06: Cavity resonators
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)

## Abstract

A single-layer cross-coupling filter includes a cavity in which a receiving space is formed; an integrally formed resonant structure installed in the receiving space; and at least one partition wall. The resonant structure includes at least two rows of resonant units distributed along a signal transmission path. The at least two rows of resonant units are located in a same plane of the receiving space, and each row of the resonant units includes a plurality of resonators. The resonators on a same row are coupled and connected to form signal transmission, and at least two adjacent resonators in different rows are coupled and connected to realize cross-coupling.

## Claims

### Claim 1

A single-layer cross-coupling filter, comprising:
a cavity in which a receiving space is formed;
an integrally formed resonant structure installed in the receiving space, and including at least two rows of resonant units distributed along a signal transmission path, the at least two rows of resonant units being located in a same plane of the receiving space, each row of the resonant units including a plurality of resonators, wherein the resonators on a same row are coupled and connected to form signal transmission, and at least two adjacent resonators in different rows are coupled and connected to realize cross-coupling; and
at least one partition wall arranged between two adjacent rows of the resonant units, wherein a coupling window is formed on the partition wall, and the cross-coupling between the two adjacent resonators in different rows is formed through the corresponding coupling window.

### Claim 2 (depends on 1)

The single-layer cross-coupling filter according to claim 1, wherein each resonator comprises a body part and a bending part, one end of the body part is grounded, and wherein the bending part comprises a head bending part and an end bending part, the head bending part and the end bending part are connected to form a resonator structure circulating in a counterclockwise or clockwise direction.

### Claim 3 (depends on 2)

The single-layer cross-coupling filter according to claim 2, wherein the bending part further comprises at least a middle bending part, the at least one middle bending part connects the head bending part and the end bending part to form the resonator structure circulating in a counterclockwise or clockwise direction.

### Claim 4 (depends on 2)

The single-layer cross-coupling filter according to claim 2, wherein the head bending part is formed by bending the other end of the body part in one direction or two directions.

### Claim 5 (depends on 1)

The single-layer cross-coupled filter according to claim 1, wherein the signal transmission path is U-shaped or S-shaped.

### Claim 6 (depends on 2)

The single-layer cross-coupled filter according to claim 2, wherein one end of each body part of the plurality of resonators is grounded.

### Claim 7 (depends on 2)

The single-layer cross-coupling filter according to claim 2, wherein the body parts of the two adjacent resonators in the different rows are integrally connected through the coupling window to form inductive cross-coupling.

### Claim 8 (depends on 2)

The single-layer cross-coupled filter according to claim 2, wherein the bending parts of the two adjacent resonators in the different rows are spaced by a distance, and the spaced bending parts form capacitive cross-coupling through the coupling window.

### Claim 9 (depends on 1)

The single-layer cross-coupled filter according to claim 1, wherein the filter further comprises a signal input port and a signal output port respectively arranged at two ends of the signal transmission path.

### Claim 10 (depends on 1)

The single-layer cross-coupling filter according to claim 1, wherein the resonant structure is fixed in the cavity by at least one of a screw, solder, laser welding, friction welding, or a vacuum welding structure.

### Claim 11 (depends on 1)

The single-layer cross-coupled filter according to claim 1, wherein a plurality of screw bores are formed on the resonant structure, and a corresponding screw fixing part is disposed at a position on a bottom of the cavity corresponding to the screw bore, the screw fixes the resonant structure into the cavity through the screw bore and the screw fixing part.