Decoupled contactless bi-directional systems and methods

摘要

A contactless bi-directional device including first and second generally mutually electromagnetically decoupled contactless loop antennas which are arranged in at least partially mutually overlapping orientation, first and second contactless communication chips, each of the first and second communications chips being connected to a corresponding one of the generally mutually electromagnetically decoupled contactless loop antennas, thereby providing bi-directional communication.

主权项

1. A contactless communication device comprising:
first and second contactless communication chips; first and second generally mutually electromagnetically decoupled contactless loop antennas each connected to a corresponding one of the first and second contactless communication chips, the first contactless loop antenna comprising a loop that circumscribes an area and the second contactless loop antenna comprising a pair of at least partially non-mutually overlapping generally coplanar loops wound in mutually opposite directions, placing the first contactless communication chip being operable to communicate information to a contactless reading device, the contactless reading device operable to read the contactless communication device, upon the first and second contact loop antennas being placed in a generally uniform electromagnetic field generated by a first electromagnetic field generating coil of the contactless reading device, wherein the placement results in a null voltage being induced in the second contactless loop antenna and a voltage enabling the first contactless communication chip to communicate information to the contactless reader device being induced in the first contactless loop antenna, and the second contactless communication chip being operable to communicate information to the contactless reading device upon the first and second contact loop antennas being placed in generally mutually opposite electromagnetic fields aligned with the coplanar loops and generated by a second electromagnetic field generating coil of the contactless reading device aligned with the coplanar loops, wherein the placement results in a null voltage being induced in the first contactless loop antenna and a voltage enabling the second contactless communication chip to communicate information to the contactless reader device being induced in the second contactless loop antenna, the voltage induced in the second contactless loop antenna corresponding to a sum of induced voltages on each of the pair of coplanar loops.