US3871001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radome
Assignee: BP Chemicals Hitco Inc
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Filing: 1972-11-15
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Granted: 1975-03-11
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Expires: 1992-11-15
Abstract
Abstract A radome for the transmission with minimal electrical distortion of circularly polarized electromagnetic energy and which allows circulation of warm air for de-icing. Two sheet-like elements, each having interior elongated, generally parallel, spaced ribs are joined together to form a laminate. The ribs of the first element are oriented generally perpendicular to the ribs of the second element to minimize elliptical distortion. Spaces within the first element and between the ribs thereof define warm air ducts. Attenuation of the electromagnetic energy is minimized by making the electrical thickness of each of the sheet-like elements approximately equal to one-half of the wavelength of the energy.
Inventors
- 👤 Hubert A Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:22
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/42; H01Q1/422
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
135 words
A radome comprising first and second generally sheet-like elements joined together to form a laminate, each of the sheet-like elements having opposite broad surfaces and a plurality of elongated spaces disposed within the sheet-like element intermediate the opposite broad surfaces and spaced-apart across the sheet-like element to define a plurality of elongated ribs therebetween, the elongated spaces and the ribs formed therebetween extending generally in a common direction, each of the sheet-like elements distorting electromagnetic wave energy which passes therethrough in predictable fashion, the ribs of the first sheet-like element being oriented relative to the ribs of the second sheet-like element so that distortion of electromagnetic wave energy which has passed through the first sheet-like element is substantially balanced by distortion of the electromagnetic wave energy after it has passed through the second sheet-like element.
Claim 2
Dependent Claim
135 words
A radome comprising first and second generally sheet-like elements joined together to form a laminate, each of the sheet-like elements having opposite broad surfaces and a plurality of elongated spaces disposed within the sheet-like element intermediate the opposite broad surfaces and spaced-apart across the sheet-like element to define a plurality of elongated ribs therebetween, the elongated spaces and the ribs formed therebetween extending generally in a common direction, each of the sheet-like elements distorting electromagnetic wave energy which passes therethrough in predictable fashion, the ribs of the first sheet-like element being oriented relative to the ribs of the second sheet-like element so that distortion of electromagnetic wave energy which has passed through the first sheet-like element is substantially balanced by distortion of the electromagnetic wave energy after it has passed through the second sheet-like element.
Claim 3
Dependent Claim
135 words
A radome comprising first and second generally sheet-like elements joined together to form a laminate, each of the sheetlike elements having opposite broad surfaces and a plurality of elongated spaces disposed within the sheet-like element intermediate the opposite broad surfaces and spaced-apart across the sheet-like element to define a plurality of elongated ribs therebetween, the elongated spaces and the ribs formed therebetween extending generally in a common direction, each of the sheet-like elements distorting electromagnetic wave energy which passes therethrough in predictable fashion, the ribs of the first sheet-like element being oriented relative to the ribs of the second sheet-like element so that distortion of electromagnetic wave energy which has passed through the first sheet-like element is substantially balanced by distortion of the electromagnetic wave energy after it has passed through the second sheet-like element.
Claim 4
Dependent Claim
135 words
A radome comprising first and second generally sheet-like elements joined together to form a laminate, each of the sheetlike elements having opposite broad surfaces and a plurality of elongated spaces disposed within the sheet-like element intermediate the opposite broad surfaces and spaced-apart across the sheet-like element to define a plurality of elongated ribs therebetween, the elongated spaces and the ribs formed therebetween extending generally in a common direction, each of the sheet-like elements distorting electromagnetic wave energy which passes therethrough in predictable fashion, the ribs of the first sheet-like element being oriented relative to the ribs of the second sheet-like element so that distortion of electromagnetic wave energy which has passed through the first sheet-like element is substantially balanced by distortion of the electromagnetic wave energy after it has passed through the second sheet-like element.
Claim 5
Dependent Claim
46 words
The invention defined in claim 1, wherein the electromagnetic wave energy is circularly polarized, and each of the first and second sheet-like elements distorts the electromagnetic wave energy into a generally elliptical pattern, the orientation of which is determined by the direction of the included ribs.
Claim 6
Dependent Claim
125 words
A radome comprising first and second generally sheet-like elements joined together to form a laminate, each of the sheet-like elements having a plurality of elongated, generally parallel, spaced-apart internal ribs therein, each of the first and second sheet-like elements including a pair of nominally parallel face sheets disposed on opposite sides of and sandwiching the ribs therebetween, each of the sheet-like elements distorting electromagnetic wave energy which passes therethrough in predictable fashion, the ribs of the first sheet-like element being oriented relative to the ribs of the second sheet-like element so that the distortion of electromagnetic wave energy which has passed through the first sheet-like element is substantially balanced by distortion of the electromagnetic wave energy after it has passed through the second sheet-like element.
Claim 7
Dependent Claim
125 words
A radome comprising first and second generally sheet-like elements joined together to form a laminate, each of the sheet-like elements having a plurality of elongated, generally parallel, spaced-apart internal ribs therein, each of the first and second sheet-like elements including a pair of nominally parallel face sheets disposed on opposite sides of and sandwiching the ribs therebetween, each of the sheet-like elements distorting electromagnetic wave energy which passes therethrough in predictable fashion, the ribs of the first sheet-like element being oriented relative to the ribs of the second sheet-like element so that the distortion of electromagnetic wave energy which has passed through the first sheet-like element is substantially balanced by distortion of the electromagnetic wave energy after it has passed through the second sheet-like element.
Claim 8
Dependent Claim
122 words
A radome comprising first and second generally sheet-like elements joined together to form a laminate, each of the sheet-like elements having a plurality of elongated, generally parallel, spaced-apart internal ribs therein, each of the first and second sheet-like elements having an electrical thickness equal to approximately one-half of a wavelength of the electromagnetic wave energy, Each of the sheet-like elements distorting electromagnetic wave energy which passes therethrough in predictable fashion, the ribs of the first sheet-like element being oriented relative to the ribs of the second sheet-like element so that distortion of electromagnetic wave energy which has passed through the first sheet-like element is substantially balanced by distortion of the electromagnetic wave energy after it has passed through the second sheet-like element.
Claim 9
Dependent Claim
122 words
A radome comprising first and second generally sheet-like elements joined together to form a laminate, each of the sheet-like elements having a plurality of elongated, generally parallel, spaced-apart internal ribs therein, each of the first and second sheet-like elements having an electrical thickness equal to approximately one-half of a wavelength of the electromagnetic wave energy, Each of the sheet-like elements distorting electromagnetic wave energy which passes therethrough in predictable fashion, the ribs of the first sheet-like element being oriented relative to the ribs of the second sheet-like element so that distortion of electromagnetic wave energy which has passed through the first sheet-like element is substantially balanced by distortion of the electromagnetic wave energy after it has passed through the second sheet-like element.
Claim 10
Dependent Claim
89 words
A radome comprising first and second generally parallel sandwiches, each of the sandwiches comprising a pair of parallel, spaced apart face sheets with a plurality of elongated, generally parallel, spaced-apart ribs extending therebetween, one of the face sheets of the first sandwich being mounted on and generally coextensive with a face sheet of the second sandwich, and the ribs of the first sandwich being oriented relative to the ribs of the second sandwich so as to minimize distortion of electromagnetic wave energy passing through the first and second sandwiches.
Claim 11
Dependent Claim
89 words
A radome comprising first and second generally parallel sandwiches, each of the sandwiches comprising a pair of parallel, spaced apart face sheets with a plurality of elongated, generally parallel, spaced-apart ribs extending therebetween, one of the face sheets of the first sandwich being mounted on and generally coextensive with a face sheet of the second sandwich, and the ribs of the first sandwich being oriented relative to the ribs of the second sandwich so as to minimize distortion of electromagnetic wave energy passing through the first and second sandwiches.
Claim 12
Dependent Claim
37 words
The invention defined in claim 5, wherein the thickness of each sandwich in a direction normal to the direction of the plane thereof is equal to approximately one-half of an electrical wavelength of the electromagnetic wave energy.
Claim 13
Dependent Claim
50 words
The invention defined in claim 5, wherein spaces formed between the face sheets and intermediate the ribs of the first sandwich define warm air ducts for de-icing of the radome, and wherein spaces formed between the face sheets and intermediate the ribs of the second sandwich are filled with foam.
Claim 14
Dependent Claim
24 words
The invention defined in claim 5, wherein each of the face sheets and the ribs of each sandwich together comprise interwoven, resin impregnated cloth.
Claim 15
Dependent Claim
35 words
The invention defined in claim 5, wherein the face sheets which are mounted on and coextensive with each other have a combined thickness less than twice the thickness of each of the opposite face sheets.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |