Patent ID: 6452504
Filing Date: 2002-09-17
Classification: G01S

Abstract:
A method of maintaining continuous communication between a transceiver and a radio frequency identification (RFID) transponder having an antenna coil, said transceiver having a plurality of antenna coils oriented in a first spatial relationship to each other, the method comprising:positioning said transponder in relative proximity to said transceiver, said transponder being oriented in a second spatial relationship with respect to said plurality of antenna coils of said transceiver; concurrently transmitting a first signal according to a first protocol from each of said plurality of antenna coils of said transceiver; and concurrently transmitting a second signal according to said first protocol from a subset of said plurality of antenna coils of said transceiver; wherein said first and second spatial relationships are such that either or both of said first signal and said second signal are at least partially coupled to said antenna coil of said transponder.