# US 2023/0410583 A1 · Bluetooth communication circuit and vehicle key containing the same

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

- Number: US 2023/0410583 A1
- Document ID: US20230410583A1
- Status: Published application
- Kind: A1
- Application number: 17/946,144
- Filed: 2022-09-16
- Published: 2023-12-21
- Earliest claimed: 2022-06-20
- Assignees: Inventec (Pudong) Technology Corporation; Inventec Corporation
- Applicants: Inventec (Pudong) Technology Corporation; Inventec Corporation
- Inventors: You Zhang
- Web page: https://patentgrep.com/patent/US20230410583A1

## CPC

- G07C 9/00896: {specially adapted for particular uses}
- G07C 2009/00769: {with data transmission performed by wireless means}
- Y02D 30/70: in wireless communication networks
- G07C: TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A Bluetooth communication circuit, comprising: a microcontroller for providing a Bluetooth signal; a surface acoustic wave filter signally connected to the surface acoustic wave filter; an antenna component signally connected to the surface acoustic wave filter; a first matching inductor, with one end connected between the microcontroller and the surface acoustic wave filter and with another end connected to a common ground; and a second matching inductor, with one end connected between the surface acoustic wave filter and the antenna assembly and with another end connected to the common ground.

## Claims

### Claim 1

A Bluetooth communication circuit, comprising:
a microcontroller configured to provide a Bluetooth signal;
a surface acoustic wave filter signally connected to the microcontroller;
an antenna component signally connected to the surface acoustic wave filter;
a first matching inductor connected between the microcontroller and the surface acoustic wave filter with one end, and connected to a common ground with another end; and
a second matching inductor connected between the antenna component and the surface acoustic wave filter with one end, and connected to the common ground with another end.

### Claim 2 (depends on 1)

The Bluetooth communication circuit of claim 1, wherein the surface acoustic wave filter has six pins, with one pin of the six pins connected between the microcontroller and the first matching inductor, with another pin of the six pins connected between the antenna component and the second matching inductor, and with the remaining four pins connected to the common ground.

### Claim 3 (depends on 1)

The Bluetooth communication circuit of claim 1, wherein the surface acoustic wave filter comprises a built-in circuit formed of a plurality of built-in capacitors and a plurality of resistors.

### Claim 4 (depends on 1)

The Bluetooth communication circuit of claim 1, further comprising a matching capacitor, with one end of the matching capacitor connected between the microcontroller and the surface acoustic wave filter, and with another end of the matching capacitor connected to the common ground.

### Claim 5 (depends on 4)

The Bluetooth communication circuit of claim 4, wherein a capacitance of the matching capacitor is 0.5 pF.

### Claim 6 (depends on 4)

The Bluetooth communication circuit of claim 4, further comprising an output inductor, with one end of the matching capacitor connected between the microcontroller and the matching capacitor, and with another end of the matching capacitor connected between the surface acoustic wave filter and the first matching inductor.

### Claim 7 (depends on 6)

The Bluetooth communication circuit of claim 6, wherein the inductance of the output inductor is 5.1 nH.

### Claim 8 (depends on 1)

The Bluetooth communication circuit of claim 1, wherein the inductance of the first matching inductor and the second matching inductor are 5.1 nH.

### Claim 9 (depends on 1)

A vehicle key, comprising:
a case; and
a circuit board disposed in the case, and loaded with the Bluetooth communication circuit of claim 1.

### Claim 10 (depends on 2)

A vehicle key, comprising:
a case; and
a circuit board disposed in the case, and loaded with the Bluetooth communication circuit of claim 2.

### Claim 11 (depends on 3)

A vehicle key, comprising:
a case; and
a circuit board disposed in the case, and loaded with the Bluetooth communication circuit of claim 3.

### Claim 12 (depends on 4)

A vehicle key, comprising:
a case; and
a circuit board disposed in the case, and loaded with the Bluetooth communication circuit of claim 4.

### Claim 13 (depends on 5)

A vehicle key, comprising:
a case; and
a circuit board disposed in the case, and loaded with the Bluetooth communication circuit of claim 5.

### Claim 14 (depends on 6)

A vehicle key, comprising:
a case; and
a circuit board disposed in the case, and loaded with the Bluetooth communication circuit of claim 6.

### Claim 15 (depends on 7)

A vehicle key, comprising:
a case; and
a circuit board disposed in the case, and loaded with the Bluetooth communication circuit of claim 7.

### Claim 16 (depends on 8)

A vehicle key, comprising:
a case; and
a circuit board disposed in the case, and loaded with the Bluetooth communication circuit of claim 8.