Patent EP0102846A1 successfully refreshed from Google Patents.
EP0102846A1
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Dual reflector microwave antenna
Assignee: Commscope Technologies LLC
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Filing: 1983-09-06
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Granted: —
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Expires: 2003-09-06
Abstract
Abstract @ A microwave antenna which comprises a paraboloidal main reflector (10); a subreflector (13) located between the main reflector (10) and the focal point (F) of the main reflector (10) and forming a reflecting surface which is shaped symmetrically about the center thereof, the central portion of the reflecting surface sloping axially away from the main reflector (10) at a rate which reduces as the radius of the subreflector (13) increases, the radially outer portion of the subreflector (13) sloping axially toward the main reflector (10) at a rate which increases as the radius of the subreflector (13) increases; and a feed horn (11) for transmitting microwave signals to, and receiving microwave signals from, the subreflector (13), the reflecting surface of the subreflector being positioned and dimensioned to intercept substantially all the energy launched through the feed horn (11) or reflected by the main reflector (10). The feed horn (11) is preferably a smooth-walled waveguide having an aperture diameter substantially equal to one wavelength of the midband signals propagated therethrough.
Inventors
- 👤 Charles M. Knop
- 👤 Edward L. Ostertag
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 05:26
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/18; H01Q19/19; H01Q19/193
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
154 words
A microwave antenna comprising a paraboloidal main reflector (10), a subreflector (13) located between said main reflector (10) and the focal point (F) of said main reflector (10) and having a reflecting surface (30), a feed horn (11) for transmitting microwave signals to, and receiving microwave signals from said subreflector (13), the reflecting surface (30) of said subreflector (13) being positioned and dimensioned to intercept substantially all the energy launched through said feed horn (11) or reflected by said main reflector (10), characterised in that said reflecting surface (30) is shaped symmetrically -about the center thereof, the central portion of said reflecting surface (30) sloping axially away from said main reflector (10) at a rate which reduces as the radius of said subreflector (13) increases, and the radially outer portion of said subreflector (13) sloping axially toward said main reflector (10) at a rate which increases as the radius of said subreflector (13) increases.
Claim 2
Dependent Claim
154 words
A microwave antenna comprising a paraboloidal main reflector (10), a subreflector (13) located between said main reflector (10) and the focal point (F) of said main reflector (10) and having a reflecting surface (30), a feed horn (11) for transmitting microwave signals to, and receiving microwave signals from said subreflector (13), the reflecting surface (30) of said subreflector (13) being positioned and dimensioned to intercept substantially all the energy launched through said feed horn (11) or reflected by said main reflector (10), characterised in that said reflecting surface (30) is shaped symmetrically -about the center thereof, the central portion of said reflecting surface (30) sloping axially away from said main reflector (10) at a rate which reduces as the radius of said subreflector (13) increases, and the radially outer portion of said subreflector (13) sloping axially toward said main reflector (10) at a rate which increases as the radius of said subreflector (13) increases.
Claim 3
Dependent Claim
19 words
A microwave antenna as claimed in claim 1, characterised in that said feed horn (11) is a smooth-walled waveguide.
Claim 4
Dependent Claim
30 words
A microwave antenna as claimed in either preceding claim, characterised in that the aperture of said feed horn (11) has a width of about one wavelength at the midband frequency.
Claim 5
Dependent Claim
37 words
A microwave antenna as claimed in any preceding claim, characterised in that said feed horn (11) is supported by a rigid waveguide (12) extending through the center of said main reflector (10) and along the axis thereof.
Claim 6
Dependent Claim
29 words
A microwave antenna as claimed in any preceding claim, characterised in that said subreflector (13) is supported by a dielectric conical section (14) fastened to said main reflector (10).
Claim 7
Dependent Claim
33 words
A microwave antenna as claimed in any preceding claim, characterised in that said subreflector (13) is positioned and dimensioned to intercept at least about 98% of the energy from said feed horn (11).
Claim 8
Dependent Claim
39 words
A microwave antenna as claimed in any preceding claim, characterised in that the center of said subreflector (13) is closer to the plane (a) of the aperture of said main reflector (10) than the periphery of said subreflector (13).
Claim 9
Dependent Claim
43 words
A microwave antenna as claimed in any preceding claim, characterised in that the reflecting surface (30) of said subreflector (13) forms a smooth continuous concave curve between the center of said subreflector (13) and any point on the periphery of said subreflector (13).
Claim 10
Dependent Claim
30 words
A microwave antenna as claimed in any preceding claim, characterised in that said feed horn (11) launches signals onto said subreflector (13) with substantially equal E and H plane patterns.
Claim 11
Dependent Claim
49 words
A microwave antenna as claimed in any preceding claim, characterised in that said feed horn (11) is located on the axis of said main reflector (10) between said main reflector (10) and said subreflector (13) and has a VSWR of less than about 1.3 over the operating frequency band.
References Cited (Backward Citations)
GB973583A
Cited
US3241147A
Cited
FR1392013A
Cited
FR1407753A
Cited
GB1218351A
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US3705406A
Cited
US3983560A
Cited
JPS54148460A
Cited
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