# US 10,312,574 B2 · Selective specific absorption rate (SAR) mitigation

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- Number: US 10,312,574 B2
- Document ID: US10312574B2
- Status: Granted
- Kind: B2
- Application number: 14/820,402
- Filed: 2015-08-06
- Published: 2017-02-09
- Granted: 2019-06-04
- Earliest claimed: 2015-08-06
- Assignees: Arlo Technologies, Inc.
- Applicants: Chih-Chuan (Jorg) Yen; Alan Pasion
- Inventors: Chih-Chuan (Jorg) Yen; Alan Pasion
- Web page: https://patentgrep.com/patent/US10312574B2

## CPC

- H01Q 1/245: {with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

Systems, methods, and devices for reducing specific absorption rate (SAR) for an antenna are disclosed. An example method includes determining a location of a hotspot on a surface of the antenna, the hotspot comprising an area of increased SAR above a predetermined limit. The method further includes introducing a recess in the surface of the antenna at a recess location, the recess location based on the location and frequency characteristics of the hotspot. Example systems and devices include a surface forming an antenna structure and a recess in the surface of the antenna at a recess location, wherein the recess location would be a hotspot when the surface of the antenna is not recessed, the hotspot comprising an area of increased SAR above a predetermined limit.

## Claims

### Claim 1

A method of reducing specific absorption rate (SAR) from an antenna comprising:
determining locations of multiple hotspots on a surface of the antenna, each hotspot comprising an area of increased SAR above a predetermined limit;
introducing multiple recesses in the surface of the antenna, the location and depth of the multiple recesses based on the location and strength of the multiple hotspots.

### Claim 2 (depends on 1)

The method of claim 1, wherein the recess locations are at the location of the hotspots.

### Claim 3 (depends on 1)

The method of claim 1, wherein the predetermined limit comprises a regulatory limit.

### Claim 4 (depends on 3)

The method of claim 3, wherein the regulatory limit comprises a Federal Communications Commission (FCC) limit.

### Claim 5 (depends on 1)

The method of claim 1, further comprising shielding at least one of the multiple hotspots.

### Claim 6 (depends on 1)

The method of claim 1, wherein the determination of the location of the hotspots on the surface of the antenna is made for a specific signal frequency, the specific signal frequency used for transmission of signals by the antenna.

### Claim 7

An antenna with a reduced specific absorption rate (SAR), the antenna comprising:
a surface forming an antenna structure; and
multiple recesses in the surface of the antenna at recess locations, wherein the recess locations would be a hotspot when the surface of the antenna is not recessed, the hotspot comprising an area of increased SAR above a predetermined limit.

### Claim 8 (depends on 7)

The antenna of claim 7, wherein the recess locations are at the location of the hotspots.

### Claim 9 (depends on 7)

The antenna of claim 7, wherein the recess reduces SAR below a regulatory limit.

### Claim 10 (depends on 9)

The antenna of claim 9, wherein the regulatory limit comprises an FCC limit.

### Claim 11 (depends on 7)

The antenna of claim 7, further comprising shielding at least one of multiple hotspot locations.

### Claim 12 (depends on 7)

The antenna of claim 7, wherein the location of the hotspots on the surface of the antenna is for a specific signal frequency, the specific signal frequency used for transmission of signals by the antenna.

### Claim 13

An electronic device comprising:
a transmitter; and
an antenna coupled to the transmitter, the antenna having a reduced specific absorption rate (SAR), the antenna including:
a surface forming an antenna structure; and
multiple recesses in the surface of the antenna at recess locations, wherein the recess locations would be a hotspot when the surface of the antenna is not recessed, the hotspot comprising an area of increased SAR above a predetermined limit.

### Claim 14 (depends on 13)

The electronic device of claim 13, wherein the recess locations are at the location of the hotspots.

### Claim 15 (depends on 13)

The electronic device of claim 13, wherein the location of the hotspots on the surface of the antenna is for a specific signal frequency, the specific signal frequency used for transmission of signals by the antenna.