Patent US1791927A successfully refreshed from Google Patents.
US3763493A
Expired / Lapsed
US
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Antenna device applicable for two different frequency bands
Assignee: NTT Inc
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Filing: 1971-10-06
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Granted: 1973-10-02
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Expires: 1991-10-06
Abstract
Abstract A branching filter using dielectric elements is disposed on the side of one of a pair of reflectors for reflecting emitted or incident waves, the branching filter being capable of reflecting one of the two frequency group components and of transmitting the other frequency group component to branch and converge the two components at different points.
Inventors
- 👤 S Shimada
- 👤 M Koyama
- 👤 H Kumazawa
- 👤 M Karikomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:27
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/0006; H01Q15/0013; H01Q15/0033; H01Q19/00; H01Q19/10; H01Q19/104; H01Q5/00; H01Q5/40; H01Q5/45
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
158 words
An antenna for reflecting emitted and incident wave components of first and second frequency groups, comprising first and second reflectors positioned in opposed relation to sequentially reflect wave components, and a third reflector positioned adjacent one of said first and second reflectors, said third reflector being comprised of a branching filter having a plurality of dielectric layers positioned to reflect wave components of said second group and transmit wave components of said first group, said first and second reflectors being positioned to converge wave components of said first group at a first point, and said third and otherof said first and second reflectors being positioned to converge wave components of said second group at a second position spaced from said first position, said branching filter being comprised of a plurality of alternate layers of materials of two different dielectric constants with thickness substantially equal to one-quarter of the wave length of the center frequency of the second group.
Claim 2
Dependent Claim
158 words
An antenna for reflecting emitted and incident wave components of first and second frequency groups, comprising first and second reflectors positioned in opposed relation to sequentially reflect wave components, and a third reflector positioned adjacent one of said first and second reflectors, said third reflector being comprised of a branching filter having a plurality of dielectric layers positioned to reflect wave components of said second group and transmit wave components of said first group, said first and second reflectors being positioned to converge wave components of said first group at a first point, and said third and otherof said first and second reflectors being positioned to converge wave components of said second group at a second position spaced from said first position, said branching filter being comprised of a plurality of alternate layers of materials of two different dielectric constants with thickness substantially equal to one-quarter of the wave length of the center frequency of the second group.
Claim 3
Dependent Claim
47 words
The antenna of claim 1 wherein said one reflector is said second reflector, said first and second reflectors are paraboloidal with a common focal point, and said third reflector is positioned between said first and second reflectors and is hyperboloidal with a focus at said common point.
Claim 4
Dependent Claim
38 words
The antenna of claim 1 further comprising a horn for said second group at the conjugate focal point of said common focal point, and a second horn for said group positioned at the center of said first reflector.
Claim 5
Dependent Claim
24 words
The antenna of claim 3 wherein said first group is in the microwave frequency band and said second group is in the quasimillimeter band.
Claim 6
Dependent Claim
118 words
The antenna of claim 1 wherein said one reflector is said second reflector, said second and third reflectors are hyperboloidal, said first reflector is paraboloidal with a focus common with one focus of said second reflector a horn at the other focus of said second reflector with the axis of the two focal points of the second reflector at an angle to the axis of said first reflector, one focus of the third reflector coinciding with the one focus point of said second reflector, and a horn at the other focus point of said third reflector, the axis of the focal points of said third reflector being at a different angle to the axis of the first reflector.
Claim 7
Dependent Claim
49 words
The antenna of claim 1 wherein said one reflector is said first reflector, said first and third reflectors are paraboloidal, and said second reflector is a plane reflector at an angle to the axis of the first reflector, the axes of said first and third reflectors being spaced apart.
Claim 8
Dependent Claim
37 words
The antenna of claim 1 wherein said one reflector is said second reflector, said first reflector is paraboloidal and said second and third reflectors are plane reflectors at different angles to the axis of said first reflector.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |