Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Iff or sif
Patent
1995-04-19
1996-12-10
Pihulic, Daniel T.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Iff or sif
342 6, G01S 1378, H01Q 1500
Patent
active
055835074
ABSTRACT:
A method and apparatus for passive identification includes a series of elements preferably in the form of strips, bars or other geometric shapes, or as dipole antennas made of a material having variable EM retro-reflectivity characteristics. By varying the characteristics of individual elements (i.e. spatial, polarization, frequency response and angular extent of retro-reflection), the elements form an alterable pattern which can be used for identification. The characteristics can be changed remotely, the ability of the device to understand and implement the change being a criterion for identification.
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D'Isepo Thomas C.
Lai David C.
Stiver Donald L.
Martin Marietta Corporation
Pihulic Daniel T.
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