Patent ID: 8717180
Filing Date: 2014-05-06
Classification: A62B,A63B,G01S,G08B

Abstract:
1. A transponder, comprising: an antenna structure configured for receiving an incoming signal with radio frequency (RF) power of a first frequency f an amplifier configured to provide an amplified transparent output signal based on the incoming signal; a frequency converter configured to convert the incoming signal into the transparent output signal; a first frequency filter connected to the antenna structure and tuned to the first frequency f a sensor configured to respond to physical stimulus for generating a control signal as an output response, wherein the sensor includes a motion sensor; and an activator configured for selectively activating or deactivating retransmission based on the control signal, wherein the activator deactivates retransmission if the motion sensor detects that the transponder is moving, and activates retransmission if the motion sensor detects that the transponder is stationary.