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Wireless communication system, radio frequency communications system, wireless communications method, radio frequency communications method

  • US 6,289,209 B1
  • Filed: 08/08/1997
  • Issued: 09/11/2001
  • Est. Priority Date: 12/18/1996
  • Status: Expired due to Term
First Claim
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1. A radio frequency communications system comprising:

  • a first radio frequency transponder adapted to be coupled to one of a plurality of selectable antennas, including a look-up table having rows holding data representing antennas, and including a pointer array having pointer elements pointing to different rows of the look-up table, the pointer array including a top row and a bottom row, the pointer array defining an order, from the top row of the array to the bottom row of the array, in which antennas will be used to attempt communication; and

    a second radio frequency transponder configured to communicate with the first transponder, wherein the first transponder uses an antenna defined by data in the row of the look-up table to which the element in the top row of the pointer array points, for communication with the second transponder, and, if successful communication with the second transponder is not established, the first transponder uses an antenna defined by data in the row of the look-up table to which the element in the second highest row in the array points, and, if successful communication with the second transponder is still not established, the first transponder uses an antenna defined by data in the row of the look-up table to which the element in the third highest row in the array points;

    wherein the order defined by the pointer array is selectively rearranged, the first radio frequency transponder being operable in a first mode, wherein the order defined by the pointers is rearranged after a successful communication with the second radio frequency transponder such that the top row of the array points to data representing the first row in the look-up table that resulted in successful communication, and a second mode, wherein the order defined by the pointers is rearranged after a successful communication with the second radio frequency transponder such that the element of the array which pointed to the row in the look-up table that resulted in successful communication points to the next higher row in the look-up table and such that the next higher element of the array points to the row in the look-up table that resulted in successful communication.

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