Resources Contact Us Home
Elliptical polarizers, tags and identification systems using frequency selective surfaces

Image Number 8 for United States Patent #7629569.

An optical combination includes a substrate, a linear polarizer on the substrate, and a first frequency selective surface (FSS) based elliptical polarization filter on the linear polarizer. The first FSS comprises at least one periodic pattern of spaced apart electrically conductive lines having a sub-wavelength line-to-line spacing orientated along a first axis. The pattern is operable to impose a phase differential for one orthogonal linear polarization state relative to the other linear polarization state for electromagnetic radiation having a wavelength between 400 nm and 1 mm, such as 1 .mu.m to 12 .mu.m. An identification system and associated method for identifying objects includes at least one tag having encoded information attached to the surface of an object to be identified, wherein the tag includes a first FSS-based elliptical polarization filter which provides the encoding. A remotely located receiver including a second FSS-based elliptical polarization filter and a linear polarizer optically coupled to the second filter is operable for differentially attenuating the first and second orthogonal polarization states allowing a determination whether the intensity pattern corresponds to the encoded information.

  Recently Added Patents
Switching module and switching synchronization system
Method and apparatus for managing communication services for user endpoint devices
Display apparatus, control method thereof, and program
Methods and systems for automated segmentation of dense cell populations
Inductive signal transfer system for computing devices
Methods for detecting DNA-binding proteins
Trimming circuit and semiconductor device
  Randomly Featured Patents
Method and apparatus for controlling enclosure material feeding in a mail inserting system
Connecting rod bearing assembly
Optical glass
Fluidic nanotubes and devices
System and method for signaling and transmitting uplink reference signals
Printed circuit board and method of manufacturing the same
Assembly for moving heavy objects
Antibody that reacts with 6-sulfated sialyl Lewis X