US4733244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarization separating reflector, especially for microwave transmitter and receiver antennas
Assignee: Airbus Defence and Space GmbH
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Filing: 1985-08-30
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Granted: 1988-03-22
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Expires: 2005-08-30
Abstract
Abstract A polarization separating reflector is constructed for use in microwave transmitting antennas or in microwave receiving antennas. The signal supply to the transmitting antennas and the signal retrieval from the receiving antennas may be symmetrical or nonsymmetrical. Such antennas may or may not be equipped with subreflectors. Such antennas have a polarization selectively reflecting lattice structure on or within a dielectric carrier. This antenna structure is resonantly constructed out of separate dipoles having different lengths, preferably in the form of a linear dipole lattice. The dipoles are arranged in a staggered manner, colinearly, or at an angle relative to a reference line, such as the vertical, as desired.
Inventors
- 👤 Peter Edenhofer
- 👤 Manfred Galka
- 👤 Juergen Habersack
- 👤 Norbert Nathrath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:44
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/22; H01Q15/0006; H01Q15/0013
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
181 words
An antenna reflector system for a microwave transmitter antenna or for a microwave receiver antenna, comprising a plurality of low-loss dielectric layers arranged symmetrically to form a substrate, a plurality of individual dipoles arranged in a resonance pattern to form a single dipole lattice or array on said substrate which forms a mechanically stiff carrier for said dipoles, all of said dipoles having substantially the same given dipole length (L) and substantially the same resonant frequency, a first spacing (d) between neighboring dipoles in the direction of said dipole length, each dipole having a given dipole width (w), a second spacing (D) between neighboring dipoles in the direction of said dipole width, said dipole length (L) and said first (d) and second (D) spacings being so selected that an optimal broadband antenna characteristic is achieved, said dipoles being arranged in columns which are displaced relative to each other so that dipoles of one column fully overlap said first spacing (d) between the dipoles of another neighboring column and vice versa for forming polarization separators which together achieve said broadband antenna characteristic.
Claim 2
Dependent Claim
181 words
An antenna reflector system for a microwave transmitter antenna or for a microwave receiver antenna, comprising a plurality of low-loss dielectric layers arranged symmetrically to form a substrate, a plurality of individual dipoles arranged in a resonance pattern to form a single dipole lattice or array on said substrate which forms a mechanically stiff carrier for said dipoles, all of said dipoles having substantially the same given dipole length (L) and substantially the same resonant frequency, a first spacing (d) between neighboring dipoles in the direction of said dipole length, each dipole having a given dipole width (w), a second spacing (D) between neighboring dipoles in the direction of said dipole width, said dipole length (L) and said first (d) and second (D) spacings being so selected that an optimal broadband antenna characteristic is achieved, said dipoles being arranged in columns which are displaced relative to each other so that dipoles of one column fully overlap said first spacing (d) between the dipoles of another neighboring column and vice versa for forming polarization separators which together achieve said broadband antenna characteristic.
Claim 3
Dependent Claim
23 words
The antenna reflector system of claim 1, wherein the dipoles in each column are longitudinally aligned with one another in a colinear arrangement.
Claim 4
Dependent Claim
22 words
The antenna reflector system of claim 1, wherein the dipoles are arranged at an angle slanting relative to a vertical reference line.
Claim 5
Dependent Claim
34 words
The antenna reflector system of claim 1, wherein said single dipole lattice is arranged with another single dipole lattice to form a double reflector having two reflector sections arranged orthogonally relative to each other.
Claim 6
Dependent Claim
56 words
The antenna reflector system of claim 1, wherein said dipoles are linear dipoles arranged to form a single linear lattice, said reflector having a given surface curvature and an antenna aperture defining a plane, said linear dipoles being located on curves of said curvature which curves constitute parallel lines when projected into said antenna aperture plane.
Claim 7
Dependent Claim
41 words
The antenna reflector system of claim 1, wherein said substrate of dielectric material forms a sandwich type shell having a cover skin and a cover skin spacing corresponding to about λ/4, wherein λ is the wave length of the respective microwave.
Claim 8
Dependent Claim
21 words
The antenna reflector system of claim 1, wherein said plurality of dipoles are arranged to form a single linear dipole lattice.
Claim 9
Dependent Claim
53 words
The antenna reflector system of claim 1, operating at a central wavelength of λ, wherein said dipole length L is about λ/2, wherein said dipole width w is within the range of 0.5 mm≦w<<L, wherein said first spacing d is within the range λ/128≲d≲λ/8, and wherein said second spacing D is about D≦λ/5.
References Cited (Backward Citations)
US3102265A
Cited
US3137000A
Cited
US3961333A
Cited
US4160254A
Cited
EP0015804A2
Cited
US4228437A
Cited
US4477815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |