US 12,437,621 B2
System and method for foil detection using millimeter wave for retail applications
John A. Allen, Pompano Beach, FL (US); and Michael Del Busto, Lake Worth, FL (US)
Assigned to Sensormatic Electronics, LLC, Boca Raton, FL (US)
Filed by Sensormatic Electronics, LLC, Boca Raton, FL (US)
Filed on Jun. 5, 2023, as Appl. No. 18/329,230.
Application 18/329,230 is a continuation of application No. 17/162,689, filed on Jan. 29, 2021, granted, now 11,704,986.
Claims priority of provisional application 62/968,971, filed on Jan. 31, 2020.
Prior Publication US 2023/0316885 A1, Oct. 5, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G08B 13/24 (2006.01)
CPC G08B 13/2468 (2013.01) [G08B 13/2451 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A system for detecting metal foil using millimeter wave (mmWave) for retail applications, comprising:
one or more pedestals positioned to define an exit portal leading to a point of exit;
one or more security tag readers, fixedly positioned with the one or more pedestals, configured to read data from a security tag approaching the exit portal; and
one or more mmWave receivers, fixedly positioned near the point of exit, configured to receive one or more reflected mm Wave beams from metal foil, wherein the one or more mm Wave receivers is further configured to detect the metal foil based on receiver frequencies of the one or more reflected mmWave beams without receiver phases of the one or more reflected mmWave beams, wherein the detection of metal foil results in an alert message.