US3886561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensated zoned dielectric lens antenna
Assignee: International Telecommunications Satellite Organization
•
Filing: 1972-12-15
•
Granted: 1975-05-27
•
Expires: 1992-12-15
Abstract
Abstract A zoned dielectric lens antenna is made less frequency sensitive by filling the zone with an artificial dielectric. A section of width, T, is removed from a natural dielectric lens and replaced with a width, T, of artificial dielectric of the parallel slat or egg-crate type. The width, T, is selected so that the difference in number of wavelengths of the design frequency traveling through the zoned area and the unzoned area is a whole number.
Inventors
- 👤 John Paul Beyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:00
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
A dielectric lens for radio wave antennas, said lens being formed of a solid natural dielectric material having a zone cutout therefrom and filled with an artificial dielectric material constructed of parallel metal conductive slats and having an apparent index of refraction Eta a1 at any frequency f defined by: Eta a1 (1 -( lambda / lambda c)2)1/2, where; lambda is the free space wavelength of frequency f; and lambda c is twice the slat-to-slat spacing of said artificial dielectric.
Claim 2
Dependent Claim
80 words
A dielectric lens for radio wave antennas, said lens being formed of a solid natural dielectric material having a zone cutout therefrom and filled with an artificial dielectric material constructed of parallel metal conductive slats and having an apparent index of refraction Eta a1 at any frequency f defined by: Eta a1 (1 -( lambda / lambda c)2)1/2, where; lambda is the free space wavelength of frequency f; and lambda c is twice the slat-to-slat spacing of said artificial dielectric.
Claim 3
Dependent Claim
74 words
A dielectric lens as claimed in claim 1 wherein said zone has a depth, T, which satisfies the equation: T N lambda d/ eta o - eta a, where; N is an integral number; lambda d is the free space wavelength of a design frequency; eta o is the index of refraction of said natural dielectric material; and eta a is the apparent index of refraction of said artificial dielectric at said design frequency.
Claim 4
Dependent Claim
15 words
A dielectric lens as claimed in claim 2 wherein eta o. eta a about 1.
Claim 5
Dependent Claim
17 words
A dielectric lens as claimed in claim 2 having stacked zones filled with said artificial dielectric material.
Claim 6
Dependent Claim
175 words
A dielectric lens for radio wave antennas, said lens being formed of a solid natural dielectric material having a zone cut-out therefrom and filled with an artificial dielectric material constructed of parallel metal conductive slats and having an apparent index of refraction eta a1 at any frequency f defined by: eta a1 (1 - ( lambda / lambda c)2)1/2, where; lambda is the free space wavelength of frequency f; and lambda c is twice the slat-to-slat spacing of said artificial dielectric; said zone having a depth T, which satisfies the equation: T N lambda d/ eta o- eta a, where; N is an integral number; lambda d is the free space wavelength of a design frequency; eta o is the index of refraction of said natural dielectric material; eta a is the apparent index of refraction of said artificial dielectric at said design frequency; wherein, eta o . eta a about 1; and, a quarter wave matching section of free space between the interface formed by said natural dielectric material and said artificial dielectric material.
Claim 7
Dependent Claim
175 words
A dielectric lens for radio wave antennas, said lens being formed of a solid natural dielectric material having a zone cut-out therefrom and filled with an artificial dielectric material constructed of parallel metal conductive slats and having an apparent index of refraction eta a1 at any frequency f defined by: eta a1 (1 - ( lambda / lambda c)2)1/2, where; lambda is the free space wavelength of frequency f; and lambda c is twice the slat-to-slat spacing of said artificial dielectric; said zone having a depth T, which satisfies the equation: T N lambda d/ eta o- eta a, where; N is an integral number; lambda d is the free space wavelength of a design frequency; eta o is the index of refraction of said natural dielectric material; eta a is the apparent index of refraction of said artificial dielectric at said design frequency; wherein, eta o . eta a about 1; and, a quarter wave matching section of free space between the interface formed by said natural dielectric material and said artificial dielectric material.
References Cited (Backward Citations)
US2978702A
Cited
US2985880A
Cited
US3128467A
Cited
US3256373A
Cited
US3329958A
Cited
US3465362A
Cited
US3430248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |