# US 11,308,742 B2 · Electronic lock with slot antenna

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- Number: US 11,308,742 B2
- Document ID: US11308742B2
- Status: Granted
- Kind: B2
- Application number: 16/961,891
- Filed: 2018-12-18
- Published: 2020-11-26
- Granted: 2022-04-19
- Earliest claimed: 2018-01-22
- Assignees: Assa Abloy AB
- Applicants: Assa Abloy AB
- Inventors: Tomas Jonsson; Mats Cederblad; Peter Kjellqvist; Pär Berglund
- Web page: https://patentgrep.com/patent/US11308742B2

## CPC

- G07C 9/00309: {operated with bidirectional data transmission between data carrier and locks}
- H01Q 13/10: Resonant slot antennas
- G07C 9/00944: {Details of construction or manufacture}
- G08C 17/02: using a radio link
- H01Q 1/2208: {associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems (methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00)}
- H01Q 1/40: Radiating elements coated with or embedded in protective material
- H01Q 13/18: the slot being backed by, or formed in boundary wall of, a resonant cavity (longitudinally slotted cylinder H01Q13/12 ){; Open cavity antennas}
- 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
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)
- G08C: TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS (fluid pressure transmitting systems F15B; mechanical means for transferring the output of a sensing member into a different variable G01D5/00; mechanical control systems G05G)

## Abstract

It is provided an electronic lock for selectively locking a barrier to a surrounding structure. The electronic lock comprises: a locking bolt, a housing comprising metallic material, wherein the housing comprises a through-hole through which the locking bolt can pass; and a wireless communication module. The housing comprises a cut-out forming a slot antenna, wherein the wireless communication module is connected to the housing and thus the slot antenna. The slot antenna is formed on the same surface of the housing through which the locking bolt can pass.

## Claims

### Claim 1

An electronic lock for selectively locking a barrier to a surrounding structure, the electronic lock comprising:
a locking bolt;
a housing comprising metallic material, wherein the housing comprises a through-hole through which the locking bolt passes; and
a wireless communication module contained within the housing;
wherein the housing further comprises a cut-out forming a slot antenna, wherein the wireless communication module is connected to the housing and thus the slot antenna;
wherein the slot antenna is formed on the same surface of the housing through which the locking bolt can pass.

### Claim 2 (depends on 1)

The electronic lock according to claim 1, wherein the slot antenna has a meandering shape.

### Claim 3 (depends on 1)

The electronic lock according to claim 1, wherein the electronic lock is configured to have a mechanical form factor.

### Claim 4 (depends on 1)

The electronic lock according to claim 1, wherein the effective length of the slot antenna is about a quarter of a wavelength of radio signals intended to be transmitted or received using the antenna.

### Claim 5 (depends on 1)

The electronic lock according to claim 1, further comprising a controller provided within the housing.

### Claim 6 (depends on 5)

The electronic lock according to claim 5, further comprising memory provided within the housing, wherein the memory is connected to the controller and wherein the controller is connected to the wireless communication module.

### Claim 7 (depends on 1)

The electronic lock according to claim 1, wherein the housing is provided with a protective cover, at least on the side comprising the slot antenna.

### Claim 8 (depends on 6)

The electronic lock according to claim 6, wherein the wireless communication module is connected to two connection points provided on the housing to utilize the slot antenna.

### Claim 9 (depends on 6)

The electronic lock according to claim 6, further comprising a motor that extends and retracts the locking bolt into and out of the through hole, wherein the motor is provided within the housing and is connected directly to the controller.

### Claim 10 (depends on 6)

The electronic lock according to claim 6, wherein the memory stores access control data that is used by the controller to evaluate whether a user credential is to gain access through the barrier.

### Claim 11 (depends on 5)

The electronic lock according to claim 5, wherein the housing encloses and protects the locking bolt, the wireless communication module, and the controller.