Disclosed herein is an arrangement for shielding electronic sensors from undesired microwave or millimeter wave radiation. In this arrangement, reflective element is disposed in the sensor path to intercept incoming signals. The reflective element has a pluraity of adjacent parallel ridges therein h
Disclosed herein is an arrangement for shielding electronic sensors from undesired microwave or millimeter wave radiation. In this arrangement, reflective element is disposed in the sensor path to intercept incoming signals. The reflective element has a pluraity of adjacent parallel ridges therein having sloped faces angled for reflecting incoming desired infrared radiation onto the sensor. The width of the ridges are selected so that desired signals will be reflected by the sloped ridge faces but undesired microwave or millimeter radiation will be reflected by the overall major surface of the mirror. Accordingly, undesired microwave or millimeter radiation will be reflected away from the sensor by the overall front major surface thereby preventing the sensor from being damaged.
대표청구항▼
1. An electromagnetic shielding device for screening undesired microwave or millimeter wave signals from sensors comprising: a reflecting element having a front major surface with a plurality of parallel ridges therein, each ridge having an inclined ridge face of a predetermined width which is sub
1. An electromagnetic shielding device for screening undesired microwave or millimeter wave signals from sensors comprising: a reflecting element having a front major surface with a plurality of parallel ridges therein, each ridge having an inclined ridge face of a predetermined width which is substantially less than undesired microwave or millimeter wave signals and substantially greater than the wavelength of desired signals and further being sloped to reflect desired signals impinging thereon in a first predetermined direction while undesired signals impinging on said front major surface are reflected reflected thereby in a second predetermined direction; and a transparent block having at least one reflective surface and positioned for receiving the desired signals reflected from said reflecting element and directing said desired signals toward a sensor. 2. An electromagnetic shielding device as defined in claim 1 wherein said predetermined width is less than about one-half the wavelength of said undesired signals and greater than about twice the wavelength os said desired signals.3. A device for protecting sensors from undesired microwave or millimeter wave signals, comprising: a first reflecting element having a first front major surface with a plurality of parallel first ridges therein, each first ridge having an inclined first ridge face of a predetermined width substantially less than the wavelength of undesired microwave or millimeterwave signals for reflecting desired signals having wavelengths substantially less than said predetermined width, said inclined first ridge faces being sloped for receiving and reflecting desired signals in a first predetermined direction, and the first front major surface being oriented to reflect undesired signals in a second predetermined direction; and a second reflecting element having a second front major surface with a plurality of parallel second ridges therein, each second ridge having an inclined second ridge face of a preselected width substantially less than the wavelength of undesired signals for reflecting desired signals having wavelengths substantially less than said preselected width, said second inclined ridge faces being sloped for receiving desired signals from said first reflecting element and reflecting these signals toward a sensor, said second front major surface being oriented to reflect undesired signals reflected thereon from said first front major surface of said first reflecting element away from the sensor. 4. A sensor protection device as defined in claim 3 wherein the widths of said inclined ridge faces of said first and second reflecting elements are less than about one-half the wavelength of said undesired signals and greater than about twice the wavelength of said desired signals.5. A device for protecting sensors from undesired microwave or millimeter wave signals comprising:. a first substantially disc-shaped circular reflecting element having a hole therethrough along its central longitudinal axis, said reflecting element having a first major surface which has a plurality of concentric annular ridges therein, each ridge having a spherical segment shaped inclined ridge face, said ridge faces having a common focal plane located a predetermined distance in front of said first major surface along said central longitudinal axis, said inclined ridge faces having a predetermined width substantially less than undesired microwave or millimeter wave signals and substantially greater than the wavelength of desired signals for specularly reflecting desired signals, said inclined ridge faces being shaped so that desired signals impinging upon said front major surface along a direction substantially parallel to said longitudinal axis will be reflected toward said common focal plane and undesired signals will be reflected by said first major surface away from the sensor; and a second substantially disc-shaped circular reflecting element having anothe r front major surface which has a plurality of concentric steps therein, each step having a reflecting face of predetermined width substantially less than the wavelength of undesired signals, said second reflecting element being disposed along said central longitudinal axis with said reflecting faces facing said first major surface such that desired signals reflected from said inclined ridge faces of said first circular reflecting element toward said focal plane will be reflected by said reflecting faces of said second reflecting element toward said hole while undesired signals will be reflected by said another front major surface of said second reflecting element away from said hole. 6. A device for protecting sensors from undesired microwave or millimeter wave signals comprising: a first substantially disc-shaped reflecting element having a hole therethrough along its central longitudinal axis, said reflecting element having a first major surface which has a plurality of concentric ridges therein, each ridge having a spherical segment shaped inclined ridge face, said ridge faces having a common focal plane located a predetermined distance in front of said first major surface along said longitudinal axis, said inclined ridge faces having a predetermined width less than about one-half the wavelength of undesired signals and greater than about twice the wavelength of desired signals for specularly reflecting desired signals, said inclined ridge faces being sloped so that desired signals impringing upon said front major surface along a direction substantially parallel to said central longitudinal axis will be reflected toward said common focal plane and undesired signals will be reflected by said first major surface away from the sensor; and a second substantially disc-shaped reflecting element having another front major surface which has a plurality of concentric steps therein, each step having a reflecting face of a predetermined width less about one-half the wavelength of undesired signals and greater than about twice the wavelength of desired signals for specularly reflecting desired signals, said second reflecting element being disposed along said central longitudinal axis with said reflecting faces facing said first major surface of said first reflecting element such that desired signals reflected from said first reflecting element toward said second reflecting element will be reflected by said reflecting faces toward said hole in said first reflecting element while undesired signals will be reflected by said another front major surface away from the sensor. 7. A device for substantially attenuating undesired microwave or millimeter wave signals, comprising: a honeycomb-like structure having a plurality of adjacent square-shaped cells having four walls, the width of each wall being about twice a predetermined cut-off wavelength of the millimeter or microwave signals and the length of each cell being about three times said width to substantially attenuate microwave or millimeter wave radiation and further allow desired signals to pass through, wherein said cell walls are formed from semiconductor material, and a plurality of sensors, respective ones of said sensors being located behind respective ones of said square-shaped cells, wherein said plurality of sensors is a focal plane array, and said cell walls are grown on said focal plane array. 8. A device for shielding electronic components from undesired microwave or millimeter wave radiation, comprising: an outer dome structure having an interior wall; a sensor having a longitudinal axis located within said dome and capable of rotation along an arc; a honeycomb-like structure shaped to conform to the interior wall of said dome, said honeycomb-like structure having a plurality of adjacent cells, each having a longitudinal axis and a predetermined cross-sectional area and length selected to substantially attenuate microwave or millimeter wave radiation a nd to allow infrared signals to pass therethrough substantially unattenuated. 9. The device of claim 8, wherein the sensor and honeycomb-like structure are positioned with respect to each other such that the longitudinal axis of said sensor is aligned with the respective longitudinal axis of the respective cell as the sensor rotates.
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이 특허에 인용된 특허 (3)
Brumbaugh Charles T. (Fullerton CA) Pittenger Robert L. (Orange CA) Klees Robert M. (Costa Mesa CA), Dual mode radio frequency-infrared frequency system.
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