RECIPROCAL CIRCULAR POLARIZATION SELECTIVE SURFACES AND ELEMENTS THEREOF
First Claim
1. A circular polarization selective surface (CPSS) comprising:
- a plurality of double crankwire elements (DCEs) disposed so as to form a two-dimensional (2D) array, each double crankwire element (DCE) comprising two crankwires of the same handedness, each crankwire comprising a longitudinal segment electrically connecting two transverse segments, each of the segments being electrically conductive, the two crankwires in each DCE disposed to impart a two-fold rotational symmetry to the DCE with respect to a longitudinal symmetry axis that is generally perpendicular to the CPSS at the location of the DCE, the transverse segments of the plurality of the DCEs defining two opposing faces of the CPSS;
wherein the plurality of DCEs comprise pairs of crankwires wherein the longitudinal segments in each of said pairs are generally parallel to each other and adjacently spaced so as to form a longitudinal transmission line;
wherein the transverse segments of the crankwires in each of the plurality of DCEs are disposed to facilitate an electromagnetic (EM) coupling between nearest transverse segments of crankwires of adjacent DCEs, so as to define pairs of EM coupled transverse segments wherein at least a portion of one transverse segment is spaced from at least a portion of another transverse segment with a gap of width of at most G therebetween, and wherein said gap extends along the transverse segments over a coupling length P that is at least half of the width G of the gap.
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Abstract
A reciprocal circular polarization selective surface (CPSS) is formed of two mutually orthogonal arrays of dipoles disposed at opposite transverse CPSS faces, with opposing orthogonal dipoles individually connected by transmission lines, wherein adjacent dipoles are EM coupled for enhancing CPSS performance. In one implementation, the CPSS comprises a two-dimensional array of double-crankwire elements each having a 2-fold rotational symmetry and composed of two separate crankwires of the same handedness, with the array elements positioned to impart EM coupling between adjacent array elements for enhanced performance at normal and oblique angles of incidence. Square-array and triangular-array CPSSs are disclosed.
5 Citations
20 Claims
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1. A circular polarization selective surface (CPSS) comprising:
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a plurality of double crankwire elements (DCEs) disposed so as to form a two-dimensional (2D) array, each double crankwire element (DCE) comprising two crankwires of the same handedness, each crankwire comprising a longitudinal segment electrically connecting two transverse segments, each of the segments being electrically conductive, the two crankwires in each DCE disposed to impart a two-fold rotational symmetry to the DCE with respect to a longitudinal symmetry axis that is generally perpendicular to the CPSS at the location of the DCE, the transverse segments of the plurality of the DCEs defining two opposing faces of the CPSS; wherein the plurality of DCEs comprise pairs of crankwires wherein the longitudinal segments in each of said pairs are generally parallel to each other and adjacently spaced so as to form a longitudinal transmission line; wherein the transverse segments of the crankwires in each of the plurality of DCEs are disposed to facilitate an electromagnetic (EM) coupling between nearest transverse segments of crankwires of adjacent DCEs, so as to define pairs of EM coupled transverse segments wherein at least a portion of one transverse segment is spaced from at least a portion of another transverse segment with a gap of width of at most G therebetween, and wherein said gap extends along the transverse segments over a coupling length P that is at least half of the width G of the gap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification