US4044361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Satellite tracking cassegrainian antenna
Assignee: KDDI Corp
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Filing: 1976-04-29
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Granted: 1977-08-23
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Expires: 1996-04-29
Abstract
Abstract An antenna apparatus comprising a primary radiator having an axially symmetric field pattern, and a main reflector and a subreflector coupled to the primary radiator through a beam wave-guide path. The antenna rotating axis is aligned with the axis of the primary radiator but a little deviated from the polar axis or the earth. At least one movable beam waveguide reflector or electromagnetic lens is provided in a radio wave path between the primary radiator and the subreflector. The antenna rotating axis is adapted to be rotatable only within a small angular range. The beam wave-guide reflector or electromagnetic lens is moved to thereby deflect the antenna beam.
Inventors
- 👤 Hiroshi Yokoi
- 👤 Masataka Akagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:56
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/02; H01Q3/08; H01P; H01P3/00; H01P3/20; H01Q19/00; H01Q19/10; H01Q19/18; H01Q19/19; H01Q19/191; H01Q3/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
An antenna apparatus comprising: a primary radiator having an auxiliary symmetric field pattern; a subreflector coupled to said primary radiator through a beam wave-guide path; a main reflector coupled to said subreflector through a beam wave-guide path; movable wave-guide means provided in said beam wave-guide path between said primary radiator and said subreflector; rotation means coupled to said primary radiator, said subreflector, said main reflector and said movable beam wave-guide means for rotating, within a small angular range, said primary radiator, said subreflector, said main reflector and said movable beam wave-guide means as one body about an antenna rotating axis aligned with the axis of the primary radiator but a little deviated from the polar axis of the earth; and drive means coupled to said movable beam wave-guide means for controlling said movable beam wave-guide means to deflect an antenna beam radiated from said main reflector.
Claim 2
Dependent Claim
146 words
An antenna apparatus comprising: a primary radiator having an auxiliary symmetric field pattern; a subreflector coupled to said primary radiator through a beam wave-guide path; a main reflector coupled to said subreflector through a beam wave-guide path; movable wave-guide means provided in said beam wave-guide path between said primary radiator and said subreflector; rotation means coupled to said primary radiator, said subreflector, said main reflector and said movable beam wave-guide means for rotating, within a small angular range, said primary radiator, said subreflector, said main reflector and said movable beam wave-guide means as one body about an antenna rotating axis aligned with the axis of the primary radiator but a little deviated from the polar axis of the earth; and drive means coupled to said movable beam wave-guide means for controlling said movable beam wave-guide means to deflect an antenna beam radiated from said main reflector.
Claim 3
Dependent Claim
20 words
An antenna apparatus according to claim 1, in which said movable beam wave-guide means comprises at least one movable reflector.
Claim 4
Dependent Claim
21 words
An antenna apparatus according to claim 1, in which said movable beam wave-guide means comprises at least one movable electromagnetic lens.
Claim 5
Dependent Claim
25 words
An antenna apparatus according to claim 2, in which said movable reflector is shifted by said drive means in parallel to said antenna rotating axis.
Claim 6
Dependent Claim
51 words
An antenna apparatus according to claim 2, further comprising a second movable reflector provided in said beam wave-guide path between said primary radiator and said subreflector, and second drive means coupled to said second movable reflector for shifting said second movable reflector in a direction perpendicular to said antenna rotating axis.
Claim 7
Dependent Claim
23 words
An antenna apparatus according to claim 1, in which said drive means comprises a lead screw coupled to said movable beam wave-guide means.
Claim 8
Dependent Claim
23 words
An antenna apparatus according to claim 5, in which said second drive means comprises a lead screw coupled to said second movable reflector.
Claim 9
Dependent Claim
36 words
An antenna apparatus according to claim 1, in which said primary radiator, said subreflector and said main reflector are so installed that said antenna beam is axially symmetric on the aperture plane of said main reflector.
Claim 10
Dependent Claim
18 words
An antenna apparatus according to claim 2, in which said movable reflector is provided by said drive means.
References Cited (Backward Citations)
US3530477A
Cited
US3821746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |