Patent JPS51114984A successfully refreshed from Google Patents.
Patent US4618866A successfully refreshed from Google Patents.
US4618866A
Expired / Lapsed
US
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Dual reflector antenna system
Assignee: Mitsubishi Electric Corp
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Filing: 1983-10-27
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Granted: 1986-10-21
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Expires: 2003-10-27
Abstract
Abstract An antenna system in which primary radiators are disposed on the radiation side of beams from a main reflector and in opposition to a subreflector and in which the subreflector and the primary radiators are disposed in positions offset from beam blocking positions.
Inventors
- 👤 Shigeru Makino
- 👤 Takashi Katagi
- 👤 Shuji Urasaki
- 👤 Shunichiro Kawabata
- 👤 Yuji Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:16
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q25/007; H01Q19/00; H01Q19/10; H01Q19/18; H01Q19/19; H01Q19/192
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
93 words
An antenna system comprising a main reflector having a concave reflective surface for reflecting incident electromagnetic wave beams to opposite antennas; a subreflector having a concave reflective surface disposed in facing relationship with said main reflector for reflecting said electromagnetic wave beams to said main reflector; primary radiators disposed in positions without blocking; said main reflector and said subreflector being disposed on the same side with respect to said primary radiators; and said primary radiators being so positioned as to illuminate said subreflector to illuminate the same general area of said main reflector.
Claim 2
Dependent Claim
93 words
An antenna system comprising a main reflector having a concave reflective surface for reflecting incident electromagnetic wave beams to opposite antennas; a subreflector having a concave reflective surface disposed in facing relationship with said main reflector for reflecting said electromagnetic wave beams to said main reflector; primary radiators disposed in positions without blocking; said main reflector and said subreflector being disposed on the same side with respect to said primary radiators; and said primary radiators being so positioned as to illuminate said subreflector to illuminate the same general area of said main reflector.
Claim 3
Dependent Claim
16 words
An antenna system according to claim 1, wherein said main reflector comprises a rotary parabolic mirror.
Claim 4
Dependent Claim
15 words
An antenna system according to claim 1, wherein said subreflector comprises a rotary hyperbolic mirror.
Claim 5
Dependent Claim
24 words
An antenna system according to claim 1, wherein each of said primary radiators is disposed in the vicinity of a focus of said subreflector.
Claim 6
Dependent Claim
21 words
An antenna system according to claim 1 or claim 4, wherein said primary radiators have apertures arranged on a single plane.
Claim 7
Dependent Claim
26 words
An antenna system according to claim 1 or claim 4, wherein said subreflector is changeably disposed for adjusting direction of said beams to be reflected thereby.
Claim 8
Dependent Claim
18 words
An antenna system according to claim 1 or claim 4, wherein said primary radiator comprises a cluster feed.
Claim 9
Dependent Claim
98 words
An antenna system comprising: a main reflector having a concave reflective surface for reflecting incident electromagnetic wave beams from opposite antennas; a subreflector having a concave reflective surface disposed in facing relationship with said main reflector for reflecting said electromagnetic wave beams reflected by said main reflector; primary receivers disposed in positions without blocking; said main reflector and said subreflector being disposed on the same side with respect to said primary receivers; and said primary receivers being so positioned as to be illuminated from said subreflector which is illuminated from the same general area of said main reflector.
Claim 10
Dependent Claim
98 words
An antenna system comprising: a main reflector having a concave reflective surface for reflecting incident electromagnetic wave beams from opposite antennas; a subreflector having a concave reflective surface disposed in facing relationship with said main reflector for reflecting said electromagnetic wave beams reflected by said main reflector; primary receivers disposed in positions without blocking; said main reflector and said subreflector being disposed on the same side with respect to said primary receivers; and said primary receivers being so positioned as to be illuminated from said subreflector which is illuminated from the same general area of said main reflector.
Claim 11
Dependent Claim
16 words
An antenna system according to claim 8, wherein said main reflector comprises a rotary parabolic mirror.
Claim 12
Dependent Claim
15 words
An antenna system according to claim 8, wherein said subreflector comprising a rotary hyperbolic mirror.
Claim 13
Dependent Claim
24 words
An antenna system according to claim 8, wherein each of said primary receivers is disposed in the vicinity of a focus of said subreflector.
Claim 14
Dependent Claim
20 words
An antenna system according to claim 8 or claim 11, wherein said primary receives are arranged on a single plane.
Claim 15
Dependent Claim
26 words
An antenna system according to claim 8 or claim 11, wherein said subreflector is changeably disposed of adjusting direction of said beams to be reflected thereby.
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) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |