US3698001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency group separation filter device using laminated dielectric slab-shaped elements
Assignee: NTT Inc
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Filing: 1970-11-05
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Granted: 1972-10-10
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Expires: 1990-11-05
Abstract
Abstract A frequency group separation filer device using slab-shaped dielectric elements, preferably disposed in a beam-forming region defined between an antenna and feeder, the filter being so designed as to separate in reception the composed beams of high and low frequency groups respectively comprised of frequency components within a frequency region higher than or included in the microwave region into the individual original high and low frequency groups, and conversely in transmission to compose the separate beams of such high and low frequency groups. The branching filter comprises an assembly of a plurality of laminated plate dielectric elements each having a thickness equal to substantially one-fourth the wavelength of the central frequency of at least the aforesaid high frequency group and as a whole possessing at least two different dielectric constants. The filter further includes at least one further dielectric element having a thickness of about one-fourth the wavelength of the substantially central frequency of the low frequency groups disposed at at least one of the forward and rear sides of the assembly of laminated dielectric elements.
Inventors
- 👤 Masaki Koyama
- 👤 Sadakuni Shimada
- 👤 Masahiro Karikomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:28
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2138; H01Q; H01Q15/00; H01Q15/0006; H01Q15/0013; H01Q15/0026
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
157 words
A frequency group separation filter device for separating, in signal reception, composed electromagnetic beams of high and low frequency groups respectively including frequency components within a frequency region higher than or included in the microwave region, said filter composing in signal transmission separate electromagnetic beams of high and low frequency groups respectively including frequency components within a frequency region higher than or included in the microwave region, said filter comprising: an assembly of a plurality of laminated slab-shaped dielectric elements, each having a thickness equal to substantially onefourth the wavelength of the substantially central frequency of said high frequency groups, and said dielectric elements respectively exhibiting at least two different dielectric constants; and at least one further dielectric slab-shaped element having a thickness equal to substantially one-fourth the wavelength of the substantially central frequency of the low frequency groups disposed at at least one of the forward and rear sides of said assembly of laminated dielectric elements.
Claim 2
Dependent Claim
157 words
A frequency group separation filter device for separating, in signal reception, composed electromagnetic beams of high and low frequency groups respectively including frequency components within a frequency region higher than or included in the microwave region, said filter composing in signal transmission separate electromagnetic beams of high and low frequency groups respectively including frequency components within a frequency region higher than or included in the microwave region, said filter comprising: an assembly of a plurality of laminated slab-shaped dielectric elements, each having a thickness equal to substantially onefourth the wavelength of the substantially central frequency of said high frequency groups, and said dielectric elements respectively exhibiting at least two different dielectric constants; and at least one further dielectric slab-shaped element having a thickness equal to substantially one-fourth the wavelength of the substantially central frequency of the low frequency groups disposed at at least one of the forward and rear sides of said assembly of laminated dielectric elements.
Claim 3
Dependent Claim
26 words
A filter device according to claim 1 including at least two further dielectric elements respectively disposed at the forward and rear sides of said laminated assembly.
Claim 4
Dependent Claim
46 words
A filter device according to claim 1 wherein said at least one further dielectric element is so formed and located to satisfy the following equation for the input impedance R of the laminated assembly, the normalized wave impedance of the laminated assembly being given as Z:
Claim 5
Dependent Claim
29 words
A filter device according to claim 1 wherein said high and low frequency groups separated in reception are different from said high and low frequency groups composed in transmission.
Claim 6
Dependent Claim
25 words
A filter device according to claim 1 wherein at least one of the dielectric elements of said laminated assembly is formed by a free space.
Claim 7
Dependent Claim
23 words
A filter device according to claim 1 wherein at least one of the dielectric elements of said laminated assembly is formed of polystyrene.
Claim 8
Dependent Claim
24 words
A filter device according to claim 1 wherein at least one of the dielectric elements of said laminated assembly is made of fused quartz.
Claim 9
Dependent Claim
21 words
A filter device according to claim 1 wherein at least one of the dielectric elements of said laminated assembly is glass.
Claim 10
Dependent Claim
24 words
A filter device according to claim 1 wherein at least one of the dielectric elements of said laminated assembly is made of poly-2, 5-dichlorostyrene.
Claim 11
Dependent Claim
33 words
A filter device according to claim 1 wherein at least one of the dielectric elements of said laminated assembly includes a plurality of other dielectric elements embedded tHerein at a substantially equal interval.
Claim 12
Dependent Claim
38 words
A filter device according to claim 1 wherein the electromagnetic beams of high and low frequency groups to be separated and composed by said filter have frequency regions of 17 to 30 and 4 to 6 GHz respectively.
Claim 13
Dependent Claim
31 words
A filter device according to claim 1 wherein the electromagnetic beam of at least one of the high and low frequency groups is split into a plurality of smaller frequency divisions.
Claim 14
Dependent Claim
24 words
A filter device according to claim 1 wherein the incident angle at which incident electromagnetic beams enter said filter is less than about 30*.
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |