Patent ID: 6885291

Claim:
A transponder module having an antenna for RF communications with an external reader/interrogator, characterized by: a transponder coupling coil electrically connected to the transponder module; an antenna coupling coil electrically connected to the antenna such that the antenna and antenna coupling coil are external to the transponder module; and means for positioning the transponder coupling coil in close proximity and concentric to the antenna coupling coil, thereby providing effective transformer-type coupling between the transponder module and the antenna; characterized by: a first transponder coupling coil, electrically connected to the transponder module, disposed inside of the transponder module; and a second transponder coupling coil, electrically detached, disposed on an external surface of the transponder module closely adjacent to the first transponder coupling coil, and positioned for double coupling with the first transponder coupling coil and also with the adjacent antenna coupling coil.