Intermec IP Corporation

Amtech Corporation

Wesley M Mays

Peter Scott Hughes

Mike D Fontanarosa

Aaron J Kam Siu

An RFID transponder is provided with an active backscatter amplifier that amplifies and re-transmits a received signal. The RFID transponder comprises an antenna and a circulator having a first port connected to the antenna. A modulator is connected to a second port of the circulator. An amplifier is connected to a third port of the circulator, with the amplifier connected to the modulator. An RF signal impinging upon the antenna passes through the circulator, the amplifier, and the modulator, and returns to the antenna through the circulator. The modulator further comprises an input coupled to the second port of the circulator and an output coupled to an input of the amplifier. The amplifier has an output coupled to the third port of the circulator. The modulator is adapted to modulate the RF signal using on-off keying.

RFID transponder having active backscatter amplifier for re-transmitting a received signal

An RFID transponder is embedded in a glass surface, such as a vehicle windshield, to provide for the storage and retrieval of vehicle related data. In an embodiment of the invention, the RFID device comprises a flexible circuit substrate with an antenna formed thereon and a transponder circuit disposed on the substrate and coupled to the antenna. In a multi-layer glass panel, the RFID device is disposed between adjacent ones of the glass layers and becomes embedded therein upon lamination of the glass layers together. Alternatively, the RFID device may be formed using one of the glass layers as a substrate, thereby avoiding the need for a distinct substrate layer. Where a glass panel has a transparent conductive layer for thermal insulation, the transparent conductive layer may be used to form a conductive portion of the RFID device. In a single layer glass panel, the RFID device is embedded into the glass while the glass is in a molten or plastic state.

Embedded RFID transponder in vehicle window glass

An apparatus for sourcing an interrogation signal for use in a object identification system including a frequency hopping source for generation of an interrogation signal which is coupled to a homo dyne radio for transmission by a bi-directional antenna to a tag. Upon receipt, the tag provides a return signal that is backscatter modulated to include tag identification or other data which is processed by the sourcing system. The frequency hopping source includes a voltage controller oscillator which is driven by a pseudo random code generator for selecting one of a plurality of hopping frequencies at which the interrogation signal is to be generated based on the available bandwidth.

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Albuquerque, NM, United States of America

Wesley M Mays