초록 ▼

A microwave radar reflector includes three, substantially planar networks whose reflectivity or transmissivity may be controlled. The three networks are arranged as a trihedron with an open angle. An additional network, whose reflectivity or transmissivity may be separately controlled, is located at

A microwave radar reflector includes three, substantially planar networks whose reflectivity or transmissivity may be controlled. The three networks are arranged as a trihedron with an open angle. An additional network, whose reflectivity or transmissivity may be separately controlled, is located at said open angle of the trihedron. With the additional network controlled to be transmissive and the other networks having their characteristic modulated between reflective and transmissive, the reflector will return a modulated message when the reflector is illuminated.

대표청구항 ▼

A microwave radar reflector electrically, continuously adjustable between substantially reflective and substantially transmissive states comprising: at least three, substantially planar, networks arranged as a trihedron subtending an open angle, each said network comprised of a plurality of conducto

A microwave radar reflector electrically, continuously adjustable between substantially reflective and substantially transmissive states comprising: at least three, substantially planar, networks arranged as a trihedron subtending an open angle, each said network comprised of a plurality of conductors each with at least one variable resistance element connected therein, conductors in any one network oriented substantially parallel other conductors in said one network, current control means for subjecting said networks to a controlled current level for adjusting resistance of said variable resistance elements to that said networks present a controlled transmissivity or reflectivity to impinging electromagnetic energy, said networks presenting substantial reflectivity when said current level is substantially zero and substantial transmissivity when said current level is significantly different from zero, an additional network located in said open angle, said additional network comprised of a plurality of additional conductors each with at least one additional variable resistance element connected therein, additional conductors in said additional network oriented substantially parallel other additional conductors in said additional network, additional current control means for subjecting said additional network to a controlled current level for adjusting resistance of said additional variable resistance elements so that said additional network presents controlled transmissivity or reflectivity to impinging electromagnetic energy, said additional network presenting substantial reflectivity when said current level is substantially zero and substantial transmissivity when said current level is significantly different from zero, whereby, by adjusting said current and additional current control means said radar reflector may present a substantially transmissive, substantially reflective or variably reflective characteristic.