Patent ID: 8608088

Claim:
A passive data carrier device comprising: at least one input port adapted for receiving a finite duration radio frequency (“RF”) input signal of defined time and frequency spectral characteristics; M branches, each having an input terminal connected to an input port of said at least one input port and comprising passive RF elements for processing said input signal; and at least one output port, each being connected to a branch of said M branches, wherein each of said M branches comprises a combination of R k RF band filters and S k RF time delays, k=1 to M, where R k , S k are positive integers and at least one of R k and S k is larger than one if M is equal to one and both R k and S k are equal to or larger than one if M is a positive integer larger than one, the combination of said R k RF band filters and S k RF time delays being different for different branches of said M branches, and a processed RF output signal at said at least one output port has time and frequency spectral characteristics different from said RF input signal.