초록 ▼

A method and apparatus for providing a high impedance structure or surface comprising at least one electrically conductive wire forming at least one elongate wire spiral, the at least one elongate wire spiral being defined by a plurality of spirals of said at least one wire, the spirals having a pit

A method and apparatus for providing a high impedance structure or surface comprising at least one electrically conductive wire forming at least one elongate wire spiral, the at least one elongate wire spiral being defined by a plurality of spirals of said at least one wire, the spirals having a pitch and being spaced apart along a major axis of said elongate wire spiral; and an arrangement for varying the pitch of the spirals of said at least one wire to thereby tune the impedance of said tuneable impedance structure. An embodiment useful as an antenna aperture to steer a radio frequency beam having two different polarizations is disclosed.

대표청구항 ▼

[ What is claimed is:] [1.]1. A tuneable impedance structure comprising:(a) a plurality of electrically conductive elongate wires, each conductive elongate wire being defined by a plurality of spirals, the spirals of each conductive elongate wire having a pitch and being spaced apart along a major a

[ What is claimed is:] [1.]1. A tuneable impedance structure comprising:(a) a plurality of electrically conductive elongate wires, each conductive elongate wire being defined by a plurality of spirals, the spirals of each conductive elongate wire having a pitch and being spaced apart along a major axis of said conductive elongate wire; and(b) an arrangement for varying the pitch of the spirals of said plurality of conductive elongate wires to thereby tune the impedance of said tuneable impedance structure.