Patent ID: 6943688
Filing Date: 2005-09-13
Classification: F25D,G06K,G06Q,G07C,G08B,H01Q,H04L

Abstract:
1. An antenna arrangement for detecting a wireless article comprising: a first antenna loop disposed in a first plane for transmitting and/or receiving electromagnetic signals; a first tunable circuit connected to said first antenna loop for coupling at least received signals therefrom; a second antenna loop disposed at least in part in the first plane and overlapping at least in part said first antenna loop therein, wherein said first and second antenna loops overlap at least in part in the first plane and define a detection region adjacent thereto in which said first and second antenna loops transmit and/or receive electromagnetic signals and in which a wireless article may be; a second tunable circuit connected to said second antenna loop for coupling at least received signals therefrom; and a processor coupled to said first and second tunable circuits for processing at least received signals from said first and second antenna loops for detecting a wireless article in detection region.