Periodic surface for large scan angles

Claim 2

A tuned resonant surface antenna having a unity reflection or transmission coefficient over a narrow bandwith about the desired frequency comprising an array of resonant short dipole elements of less than one-half the wavelength ( lambda /2) in length loaded by a two-wire transmission line, said coefficient being substantially independent of the angle of incidence of the electromagnetic signal, and wherein the resonant frequency of said surface is dependant in the length of said elements and the spacing between said elements.

Claim 3

A tuned resonant surface as set forth in claim 1 wherein said array of resonant elements comprises a plurality of electrically conductive tuned resonant strips.

Claim 4

A tuned resonant surface as set forth in claim 2 wherein said array of resonant elements is formed upon a dielectric substrate.

Claim 5

A tuned resonant surface as set forth in claim 1 comprising means to tune said array of dipoles to a predetermined resonant frequency including an inductive load, means connecting the two elements of each of said dipoles to said load to provide an inductance to match the capacitance of said dipoles at said resonant frequency.

Claim 6

A tuned resonant surface as set forth in claim 4 wherein said means to tune said array to a predetermined resonant frequency comprises a shorted two-wire transmission line.

Claim 7

A tuned resonant surface as set forth in claim 4 wherein said means to tune said array to a predetermined resonant frequency comprises a coil.

Claim 8

A tuned resonant surface as set forth in claim 4 wherein said means to tune said array to a predetermined resonant frequency comprises a piece of ferrite.

Claim 9

A tuned resonant surface comprising an array of resonant elements, said elements comprising two strips of electrically conductive material positioned in a straight line in the form of a dipole of less than one-half the wavelength ( lambda /2) in length; a pair of parallel electrically conductive strips, the first of said parallel strips electrically attached to one of the internal ends of said dipole and the second of said parallel strips electrically attached to the other of the internal ends of said dipole; a third strip of electrically conductive material joining the ends of said parallel conducting strips at the ends remote from said dipole.

Claim 10

A tuned resonant surface comprising an array of resonant elements, said elements comprising two strips of electrically conductive material positioned in a straight line in the form of a dipole of less than one-half the wavelength ( lambda /2) in length; a pair of parallel electrically conductive strips, the first of said parallel strips electrically attached to one of the internal ends of said dipole and the second of said parallel strips electrically attached to the other of the internal ends of said dipole; a third strip of electrically conductive material joining the ends of said parallel conducting strips at the ends remote from said dipole.

Claim 11

A multilayer tuned resonant structure comprising a plurality of tuned resonant surfaces stacked one above the other, each of said surfaces comprising an array of resonant short dipoles of less than one-half the wavelength ( lambda /2) in length.

Claim 12

A multilayer tuned resonant structure comprising a plurality of tuned resonant surfaces stacked one above the other, each of said surfaces comprising an array of resonant short dipoles of less than one-half the wavelength ( lambda /2) in length.

Claim 13

A multilayer tuned resonant structure as set forth in claim 9 wherein all of said resonant surfaces are tuned for the same resonant frequency.

Claim 14

A multilayer tuned resonant structure as set forth in claim 9 wherein each of said resonant surfaces is tuned for a different resonant frequency.

Claim 15

A tuned resonant surface comprising an array of resonant elements, said elements comprising eight strips of electrically conductive material positioned in parallel pairs to form a gammadion and four strips of electrically conductive material joining the external ends of said parallel conducting strips, thereby making said gammadion a closed figure.

Claim 16

A tuned resonant surface comprising an array of resonant elements, said elements comprising eight strips of electrically conductive material positioned in parallel pairs to form a gammadion and four strips of electrically conductive material joining the external ends of said parallel conducting strips, thereby making said gammadion a closed figure.