US 10,475,317 B2Granted

Single-element door\window opening detector

AssigneeTyco Fire & Security GmbH

InventorsAlexander Shapira, Max Drankovsky

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Abstract

An article proximity indicator including at least one antenna having at least first and second ranges of impedance, the second range of impedance being at least partially different from the first range of impedance, the at least one antenna having a first impedance within the first range of impedance when in proximity to an article having a given dielectric constant and having a second impedance within the second range of impedance and not within the first range of impedance when not in proximity to the article having the given dielectric constant, and a proximity indication generator operable, in response to receiving an indication that the impedance of the at least one antenna has changed from being within the first range of impedance to being within the second range of impedance, for generating an indication indicating that the at least one antenna is not in proximity to the article.

Claims38

Dependent claims

An article proximity indicator comprising:

a first antenna mounted in a first plane which is orthogonal to a plane of an article having a given dielectric constant, said first antenna having a first range of impedance and a second range of impedance, said second range of impedance being at least partially different from said first range of impedance, said first antenna having a first antenna impedance within said first range of impedance when in proximity to said article and within said second range of impedance and not within said first range of impedance when not in proximity to said article;
a second antenna mounted in a second plane which coincides with said plane of said article, said second antenna having a third range of impedance and a fourth range of impedance, said third range of impedance being at least partially different from said fourth range of impedance, said second antenna having a second antenna impedance within said third range of impedance when in proximity to the article and within said fourth range of impedance and not within said third range of impedance when not in proximity to said article;
and
a proximity indication generator operable, in response to receiving at least one of a first indication that said first antenna impedance of said first antenna has changed from being within said first range of impedance to being within said second range of impedance and not within said first range of impedance or a second indication that said second antenna impedance of said second antenna has changed from being within said third range of impedance to being within said fourth range of impedance and not within said third range of impedance, for generating a proximity indication indicating that at least one of said first antenna or said second antenna is not in proximity to said article.

1 more element

An article proximity detection method, comprising:

receiving a first indication of a first measurement of a first antenna impedance of a first antenna mounted in a first plane which is orthogonal to a plane of an article having a given dielectric constant, said first antenna having at least a first range of impedance and a second range of impedance, said second range of impedance being at least partially different from said first range of impedance, said first antenna having the first antenna impedance within said first range of impedance when in proximity to said article and within said second range of impedance and not within said first range of impedance when not in proximity to said article;
receiving a second indication of a second measurement of a second antenna impedance of a second antenna mounted in a second plane which coincides with said plane of said article, said second antenna having a third range of impedance and a fourth range of impedance, said fourth range of impedance being at least partially different from said third range of impedance, said second antenna having said second antenna impedance within said third range of impedance when in proximity to the article and within said fourth range of impedance and not within said third range of impedance when not in proximity to said article;
and
in response to receiving said first indication indicating that said first antenna impedance of said first antenna has changed from being within said first range of impedance to being within said second range of impedance and not within said first range of impedance or receiving said second indication indicating that said second antenna impedance of said second antenna has changed from being within said third range of impedance to being within said fourth range of impedance and not within said third range of impedance, generating a proximity indication indicating that at least one of said first antenna or said second antenna is not in proximity to said article.

1 more element

A door\window opening detector, comprising:

at least one antenna having at least a first range of impedance and a second range of impedance, said second range of impedance being at least partially different from said first range of impedance, said at least one antenna having an impedance within said first range of impedance when in proximity to a door\window having a given dielectric constant and within said second range of impedance and not within said first range of impedance when not in proximity to said door\window having said given dielectric constant;
and
an alarm indication generator operable, in response to receiving an indication that said impedance of said at least one antenna has changed from being within said first range of impedance to being within said second range of impedance and not within said first range of impedance, for generating an alarm indication of opening of said door\window.

Dependencies are inferred from the claim text.

Facts

Application: 15/843,763Filed 15 Dec 2017 · us provisional application
Priority: 4 Jan 2017
Published: US 2018/0190092 A15 Jul 2018
Granted: 12 Nov 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G08B 13/2494
Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field: by interference with…
G01B 7/14
Measuring arrangements characterised by the use of electric or magnetic techniques: for measuring distance or clearance between spaced objects or…
G01D 5/2405
By varying capacitance: by varying dielectric
G08B 13/08
Mechanical actuation: by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind