Patent US3780374A successfully refreshed from Google Patents.
US3780374A
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Radome with matching layers
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1972-03-08
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Granted: 1973-12-18
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Expires: 1992-03-08
Abstract
Abstract A radome wall with matching layers wherein a single layer dielectric plate having a dielectric constant of Epsilon r is sandwiched by two dielectric matching layers having the dielectric constant of square root Epsilon r. One form of providing the matching layers is with strips of the same dielectric material as the plate. The strips may be spaced in parallel or parallel lattice form with a spacing pitch P between adjacent strips in order to obtain the equivalent dielectric constant of the matching layer square root Epsilon r. The thickness of the core is also determined to be an odd multiple of lambda /4 in order to obtain broader frequency band characteristics.
Inventors
- 👤 Y Shibano
- 👤 S Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:50
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/42; H01Q1/422
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
A radome wall with matching layers comprising a single layer dielectric plate of any desired thickness having a dielectric constant of Epsilon r, and two dielectric matching layers sandwiching said plate therebetween, each of said matching layers having the average dielectric constant of square root Epsilon r and a thickness which is an odd number multiple of lambda /4 where lambda is the wavelength in the matching layer.
Claim 2
Dependent Claim
68 words
A radome wall with matching layers comprising a single layer dielectric plate of any desired thickness having a dielectric constant of Epsilon r, and two dielectric matching layers sandwiching said plate therebetween, each of said matching layers having the average dielectric constant of square root Epsilon r and a thickness which is an odd number multiple of lambda /4 where lambda is the wavelength in the matching layer.
Claim 3
Dependent Claim
28 words
The radome wall with matching layers as claimed in claim 1 wherein said two matching layers are made of a dielectric material which is different from said plate.
Claim 4
Dependent Claim
78 words
The radome wall with matching layers as claimed in claim 1 wherein said two matching layers are made with strips of the same dielectric material as the plate, said strips having the width W and the thickness t1 and arranged in parallel with each other with a spacing pitch P where P is sufficiently smaller than the wavelength of an operating frequency so as to make the equivalent dielectric constant of the matching layer Square Root epsilon r.
Claim 5
Dependent Claim
28 words
The radome wall with matching layers as claimed in claim 3 wherein said two matching layers are made of a dielectric material which is different from the plate.
Claim 6
Dependent Claim
37 words
The radome wall with matching layers as claimed in claim 1 wherein the thickness of the plate of the radome is approximately an odd number multiple of lambda /4 where lambda is the wavelength of the plate.
Claim 7
Dependent Claim
22 words
The radome wall with matching layers as claimed in claim 1 wherein said matching layers have an embossed configuration with regular spacing.
Claim 8
Dependent Claim
47 words
The radome wall with matching layers as claimed in claim 1 wherein said matching layers have a lattice like structure having a distance P from center to center of adjacent parallel frames of said lattice where P is sufficiently smaller than the wavelength of an operating frequency.
Claim 9
Dependent Claim
22 words
The radome wall with matching layers as claimed in claim 2 wherein said two matching layers are integrally formed with said plate.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |