Heatable window with high-pass frequency selective surface
First Claim
Patent Images
1. A heatable window comprising:
- a transparent substrate sheet having at least one major surface;
a coating on said surface of said substrate sheet, said coating being responsive to electrical voltage to heat said window, an area of said coating defining at least two elements wherein each of said elements includes a first set of slots that are parallel to each other and a second set of slots that are parallel to each other with the slots in said first set being oriented orthogonally to the slots of said second set, each of said slots being a strip of predetermined width and predetermined length that is void of said coating, said at least two elements, in combination with the coating adjacent and between the slots thereof, defining a frequency selective surface wherein the elements of said frequency selective surface are aligned in at least one linear array with a portion of the coating separating adjacent elements of said array, and wherein the adjacent elements of said at least one linear array of elements are separated by a group of two or more channels, each of said channels having a predetermined width and being parallel to each other and also parallel to the slots of one of said first set of slots of said elements or said second set of slots of said elements, said frequency selective surface passing signals within at least one predetermined frequency range and also providing thermal heating to at least a portion of said transparent substrate that defines said frequency selective surface, said frequency selective surface mitigating thermal extremes in areas of said sheet that are adjacent to said frequency selective surface.
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Abstract
An electrically conductive coating of an automotive heatable windshield having a frequency selective surface area that facilitates the transmission of radio frequency signals. The FSS area may be a high-pass filter such that RF signals at any polarization can pass through the glazing over a wide frequency band. The FSS area is defined by a pattern in the conductive coating such that, when the conductive coating is used to heat the windshield, electrical current flows through the FSS area to mitigate hot and cold spots.
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Citations
36 Claims
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1. A heatable window comprising:
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a transparent substrate sheet having at least one major surface; a coating on said surface of said substrate sheet, said coating being responsive to electrical voltage to heat said window, an area of said coating defining at least two elements wherein each of said elements includes a first set of slots that are parallel to each other and a second set of slots that are parallel to each other with the slots in said first set being oriented orthogonally to the slots of said second set, each of said slots being a strip of predetermined width and predetermined length that is void of said coating, said at least two elements, in combination with the coating adjacent and between the slots thereof, defining a frequency selective surface wherein the elements of said frequency selective surface are aligned in at least one linear array with a portion of the coating separating adjacent elements of said array, and wherein the adjacent elements of said at least one linear array of elements are separated by a group of two or more channels, each of said channels having a predetermined width and being parallel to each other and also parallel to the slots of one of said first set of slots of said elements or said second set of slots of said elements, said frequency selective surface passing signals within at least one predetermined frequency range and also providing thermal heating to at least a portion of said transparent substrate that defines said frequency selective surface, said frequency selective surface mitigating thermal extremes in areas of said sheet that are adjacent to said frequency selective surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A coated window having a frequency selective surface, said window comprising:
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a transparent substrate sheet that defines a surface; an electrically conductive coating that is deposited on the surface of said substrate sheet; at least two spaced bus bars that are in electric contact with said coating; a first lead that contacts at least one of the bus bars and a second lead that contacts at least a second of said bus bars to provide electrical contacts for the bus bars; and an area of said coating that defines a frequency selective surface that passes signals within at least one predetermined frequency band, said frequency selective surface having at least two elements wherein each element has a first set of slots in combination with a second set of slots that are oriented orthogonally with respect to the first set of slots to form an element of predetermined length and predetermined width, the width of the slots of said first set being equal to the width of the slots of said second set, said at least two elements being adjacent to each other with a portion of said coating separating said adjacent elements, said at least two adjacent elements being separated by a group of two or more channels, each of said channels having a predetermined width and being parallel to each other and also parallel to the slots of one of said first set of slots or said second set of slots. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A coated window having a frequency selective surface, said window comprising:
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a transparent substrate sheet that defines a major surface; an electrically conductive coating that contacts the surface of said substrate; at least two spaced bus bars that are in electrical contact with said coating, a first lead that contacts at least one of the bus bars and a second lead that contacts at least a second of said bus bars to provide electrical contacts to the bus bars; and an area of said coating that defines a frequency selective surface that passes RF signals within at least one predetermined frequency band, said frequency selective surface having; a first array of groups of vertical channels, each group of such array having a plurality of vertical channels that are approximately parallel to each other, each vertical channel of said group being spaced apart from adjacent channels of the same group by a predetermined dimension, each vertical channel of said group also having a predetermined width and having a length that corresponds to the height dimension of the frequency selective surface; and an second array of patches, each patch of said second array having a predetermined length and width, each patch of said second array also having a set of horizontal slots and a set of vertical slots wherein the horizontal slots are spaced equally apart from each other and the vertical slots are spaced equally apart from each other, all of said vertical slots and said horizontal slots having the same slot width, each patch of said array of patches being situated respectively between consecutive members of said first array of groups of vertical channels, the pattern of a group of vertical channels, a patch, and a group of vertical channels repeating to form a pattern throughout the frequency selective surface. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification