# US 10,373,454 B2 · Single-element door/window opening detector

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- Number: US 10,373,454 B2
- Document ID: US10373454B2
- Status: Granted
- Kind: B2
- Application number: 15/677,755
- Filed: 2017-08-15
- Published: 2019-02-21
- Granted: 2019-08-06
- Earliest claimed: 2017-08-15
- Assignees: Tyco Fire & Security GmbH
- Applicants: Tyco Fire & Security GmbH
- Inventors: Roni Shamsian; Max Drankovsky; Alexander Shapira
- Web page: https://patentgrep.com/patent/US10373454B2

## CPC

- G08B 13/08: by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
- G01B 7/023: {for measuring distance between sensor and object (G01B7/082 and G01B7/102 take precedence)}
- G01D 5/2405: {by varying dielectric}
- G01V 3/12: operating with electromagnetic waves {(operating with millimetre waves G01V8/005)}
- G08B 13/24: by interference with electromagnetic field distribution
- H03B 28/00: Generation of oscillations by methods not covered by groups H03B5/00 - H03B27/00, including modification of the waveform to produce sinusoidal oscillations (analogue function generators for performing computing operations G06G7/26; use of transformers for conversion of waveform in AC-AC converters H02M5/18)
- H04B 1/0458: {Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages (matching circuits in general H03H)}
- H04B 1/38: Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B 17/103: {Reflected power, e.g. return loss}
- G01S 13/00: Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S 13/04: Systems determining presence of a target (based on relative movement of target G01S13/56)
- H04B 17/27: for locating or positioning the transmitter
- G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02)
- H03B: GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS (generators adapted for electrophonic musical instruments G10H; masers or lasers H01S; generation of oscillations in plasma H05H)
- H04B: TRANSMISSION
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

A door/window opening detector including an antenna having at least a first resonant frequency and a second resonant frequency associated therewith, the second resonant frequency being different from the first resonant frequency, the antenna having the first resonant frequency when in proximity to a door/window having a given dielectric constant and the second resonant frequency when not in proximity to a door/window having the given dielectric constant, and an alarm indication generator operable, in response to receiving an indication that a resonant frequency of the antenna has changed from the first resonant frequency to the second resonant frequency, for generating an alarm indication of opening of the door/window.

## Claims

### Claim 1

An article proximity indicator, comprising:
an antenna having at least a first resonant frequency and a second resonant frequency associated therewith, said second resonant frequency being different from said first resonant frequency, said antenna having said first resonant frequency when in proximity to an article having a given dielectric constant and having said second resonant frequency when not in proximity to said article having said given dielectric constant;
a high-frequency detector operable for generating a direct electrical current corresponding to an intensity of a reflected electromagnetic signal received from said antenna;
an analog to digital converter communicating with said high-frequency detector and operable for receiving said direct electrical current corresponding to said intensity of said reflected electromagnetic signal from said high-frequency detector and for converting said direct electrical current into a digital value corresponding to said intensity of said reflected electromagnetic signal; and
a proximity indication generator operable:
for receiving said digital value from said analog to digital converter;
for ascertaining, based on said digital value corresponding to said intensity of said reflected electromagnetic signal, whether a resonant frequency of said antenna has changed from said first resonant frequency to said second resonant frequency; and
in response to ascertaining that said resonant frequency of said antenna has changed from said first resonant frequency to said second resonant frequency, for generating an indication indicating that said antenna is not in proximity to said article.

### Claim 2 (depends on 1)

The article proximity indicator according to claim 1 and also comprising a high frequency oscillator operable for generating a high frequency oscillating electromagnetic signal for excitation of said antenna.

### Claim 3 (depends on 2)

The article proximity indicator according to claim 2 and also comprising a high frequency coupler coupled to said high frequency oscillator and to said antenna and operable:
for transmitting said high frequency oscillating electromagnetic signal generated by said high frequency oscillator to said antenna, said antenna being operable for radiating said high frequency oscillating electromagnetic signal; and
for receiving, from said antenna, said reflected electromagnetic signal, reflected to said antenna responsive to said radiating said high frequency oscillating electromagnetic signal.

### Claim 4 (depends on 3)

The article proximity indicator according to claim 3 and wherein said high-frequency detector is operable:
for communicating with said high frequency coupler; and
for receiving said reflected electromagnetic signal from said high frequency coupler.

### Claim 5

An article proximity detection method, comprising:
receiving a first indication of a measurement of a resonant frequency of an antenna, said antenna having at least a first resonant frequency and a second resonant frequency associated therewith, said second resonant frequency being different from said first resonant frequency, said antenna having said first resonant frequency when in proximity to an article having a given dielectric constant and having said second resonant frequency when not in proximity to said article having said given dielectric constant;
generating a direct electrical current corresponding to an intensity of a reflected electromagnetic signal received from said antenna;
converting said direct electrical current into a digital value corresponding to said intensity of said reflected electromagnetic signal;
ascertaining, based on said digital value corresponding to said intensity of said reflected electromagnetic signal, whether said resonant frequency of said antenna has changed from said first resonant frequency to said second first resonant frequency; and
in response to ascertaining that said resonant frequency of said antenna has changed from said first resonant frequency to said second resonant frequency, for generating a second indication indicating that said antenna is not in proximity to said article.

### Claim 6 (depends on 5)

The article proximity detection method according to claim 5 and also comprising generating a high frequency oscillating electromagnetic signal for excitation of said antenna.

### Claim 7 (depends on 6)

The article proximity detection method according to claim 6 and also comprising transmitting said high frequency oscillating electromagnetic signal to said antenna, said antenna being operable for radiating said high frequency oscillating electromagnetic signal.

### Claim 8 (depends on 7)

The article proximity detection method according to claim 7 and also comprising receiving, from said antenna, said reflected electromagnetic signal, reflected to said antenna responsive to said radiating said high frequency oscillating electromagnetic signal.

### Claim 9

A door\window opening detector, comprising:
an antenna having at least a first resonant frequency and a second resonant frequency associated therewith, said second resonant frequency being different from said first resonant frequency, said antenna having said first resonant frequency when in proximity to a door\window having a given dielectric constant and having said second resonant frequency when not in proximity to a door\window having said given dielectric constant;
a high-frequency detector operable for generating a direct electrical current corresponding to an intensity of a reflected electromagnetic signal received from said antenna;
an analog to digital converter communicating with said high-frequency detector and operable for receiving said direct electrical current corresponding to said intensity of said reflected electromagnetic signal from said high-frequency detector and for converting said direct electrical current into a digital value corresponding to said intensity of said reflected electromagnetic signal; and
an alarm indication generator operable:
for receiving said digital value from said analog to digital converter; and
for ascertaining, based on said digital value corresponding to said intensity of said reflected electromagnetic signal, whether a resonant frequency of said antenna has changed from said first resonant frequency to said second first resonant frequency; and
in response to ascertaining that said resonant frequency of said antenna has changed from said first resonant frequency to said second resonant frequency, for generating an alarm indication of opening of said door\window.

### Claim 10 (depends on 9)

The door\window opening detector according to claim 9 and also comprising a high frequency oscillator operable for generating a high frequency oscillating electromagnetic signal for excitation of said antenna.

### Claim 11 (depends on 10)

The door\window opening detector according to claim 10 and also comprising a high frequency coupler coupled to said high frequency oscillator and to said antenna and operable:
for transmitting said high frequency oscillating electromagnetic signal generated by said high frequency oscillator to said antenna, said antenna being operable for radiating said high frequency oscillating electromagnetic signal; and
for receiving, from said antenna, said reflected electromagnetic signal, reflected to said antenna responsive to said radiating said high frequency oscillating electromagnetic signal.

### Claim 12 (depends on 11)

The door\window opening detector according to claim 11 and wherein said high-frequency detector is operable:
for communicating with said high frequency coupler; and
for receiving said reflected electromagnetic signal from said high frequency coupler.

### Claim 13 (depends on 9)

The door\window opening detector according to claim 9 and wherein said alarm indication generator is also operable for transmitting said alarm indication of said opening of said door\window to a premises monitoring system operable for monitoring a premises of said door\window.

### Claim 14

A door\window opening detection method, comprising:
receiving an indication of a measurement of a resonant frequency of an antenna, said antenna having at least a first resonant frequency and a second resonant frequency associated therewith, said second resonant frequency being different from said first resonant frequency, said antenna having said first resonant frequency when in proximity to a door\window having a given dielectric constant and having said second resonant frequency when not in proximity to said door\window having said given dielectric constant;
generating a direct electrical current corresponding to an intensity of a reflected electromagnetic signal received from said antenna;
converting said direct electrical current into a digital value corresponding to said intensity of said reflected electromagnetic signal;
ascertaining, based on said digital value corresponding to said intensity of said reflected electromagnetic signal, whether said resonant frequency of said antenna has changed from said first resonant frequency to said second first resonant frequency; and
in response to ascertaining that said resonant frequency of said antenna has changed from said first resonant frequency to said second resonant frequency, generating an alarm indication of an opening of said door\window.

### Claim 15 (depends on 14)

The door\window opening detection method according to claim 14 and also comprising generating a high frequency oscillating electromagnetic signal for excitation of said antenna.

### Claim 16 (depends on 15)

The door\window opening detection method according to claim 15 and also comprising transmitting said high frequency oscillating electromagnetic signal to said antenna, said antenna being operable for radiating said high frequency oscillating electromagnetic signal.

### Claim 17 (depends on 16)

The door\window opening detection method according to claim 16 and also comprising receiving, from said antenna, said reflected electromagnetic signal, reflected to said antenna responsive to said radiating said high frequency oscillating electromagnetic signal.

### Claim 18 (depends on 14)

The door\window opening detection method according to claim 14 and also comprising transmitting said alarm indication of said opening of said door\window to a premises monitoring system operable for monitoring a premises of said door\window.