The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 2014
Filed:
Aug. 25, 2010
John Anderson, Derby, GB;
Aled Hughes, Staffordshire, GB;
John Anderson, Derby, GB;
Aled Hughes, Staffordshire, GB;
Other;
Abstract
A proximity sensor can be used with a device that relies on GPS signals or other radio-frequency (RF) signals. The proximity sensor can be used to determine if the signals are being deliberately blocked by an object such as metal foil placed near it. The sensor includes an oscillator, a directional couplerand an antenna. A third portof the directional coupler acts as a coupled port when RF power that has been transmitted by the antennais reflected back to the antenna by a blocking object. The reflected RF power passes along a main line of the directional couplerand a proportion is coupled to the third port. A detector provides an alert if the magnitude of the power of the transmit signal that is reflected back to the antennain the form of a receive signal exceeds a threshold.