Patent ID: 9013311
Filing Date: 2015-04-21
Classification: G01S,G06K,H01L,H01Q,H04B

Abstract:
1. A method for communication, the method comprising: receiving RF signals via a leaky wave antenna of a radio frequency identification (RFID) transponder that includes an integrated circuit external to said leaky wave antenna; and modulating an amplitude of a backscattered signal associated with said received RF signals by controlling an input impedance of said RFID transponder, wherein said input impedance is controlled by switching between a plurality of feed points of said leaky wave antenna using a feed point switch in said integrated circuit, each feed point having a different position relative to a distance between a partially reflective surface and a reflective surface that define a cavity of the leaky wave antenna, a positive terminal of each of at least two of said plurality of feed points is coupled to a different positive terminal of said integrated circuit and a negative terminal of each of said at least two of said plurality of feed points is coupled to a negative terminal of said integrated circuit, and each said different positive terminal is controlled by said feed point switch.