ANTENNA DEVICE

• US 3,680,141 A
• Filed: 11/30/1970
• Issued: 07/25/1972
• Est. Priority Date: 11/28/1969
• Status: Expired due to Term

• Current Assignee: Nippon Telegraph and Telephone Corporation
• Original Assignee: Mashahiro Karikomi
• Inventors: Karikomi, Mashahiro
• Primary Examiner(s): Lieberman, Eli
• Application Number:
  US05/093,795
• Time in Patent Office: 603 Days
• Field of Search: 343/781,837,839,840,758,761,914
• US Class Current: 343/758
• CPC Class Codes: H01Q 19/191 wherein the primary active element uses one or more deflecting surfaces, e.g. beam waveguide feeds
• CPC Class Codes: H01Q 3/16 for varying relative position of primary active element and a reflecting device

Abstract

An antenna device comprising a main spherical reflector; a subreflector for reflecting electromagnetic waves to said main reflector so as to compensate for the spherical aberration of said main reflector, a primary radiator, plane reflectors and a parabolic reflector wherein the sub-reflector and plane reflectors are interlocked with each other so as to cause plane waves to be brought from the primary radiator to the subreflector through the plane reflectors and parabolic reflector.

Claims

1. An antenna device comprising:

a main spherical reflector for reflecting electromagnetic waves;

a sub-reflector disposed between the curvature center and reflecting surface of the main reflector so as to reflect electromagnetic waves to said surface and having a mirror surface which is arranged to compensate for the spherical aberration of said main spherical reflector;

a parabolic reflector whose focal point is coincident with said curvature center so as to reflect electromagnetic waves to said sub-reflector;

a primary radiator for radiating plane electromagnetic waves;

a plane reflector for reflecting said electromagnetic waves to said parabolic reflector;

means for rotating said sub-reflector around an axial line passing through said curvature center of said main spherical reflector, with the central axis of said sub-reflector directed to said curvature center; and

means for moving said plane reflector in interlocking relationship with the rotation of said sub-reflector so as to cause the plane electromagnetic waves to be conducted from said primary radiator to said sub-reflector through said parabolic reflector.

2. An antenna device according to claim 1 wherein said primary radiator, plane reflector, parabolic reflector, sub-reflector, means for rotating said sub-reflector and means for moving said plane reflector are respectively provided in a sufficient number to constitute a plurality of wave radiating and conducting systems and are so as to reflect a plurality of electromagnetic waves to said main reflector in such a manner that the deflections of said electromagnetic waves are separately controllable.

3. An antenna device according to claim 1 wherein a wave radiating and conducting system comprising said primary radiator, plane reflector, parabolic reflector, sub-reflector, means for rotating said sub-reflector and means for moving said plane reflector is positioned outside of the path of electromagnetic waves reflected from said main spherical reflector.

4. An antenna device according to claim 1 wherein said means for moving said plane reflector in interlocking relationship with the rotation of said sub-reflector comprises:

a detector for detecting deflection errors in radiated waves and for generating error signals corresponding to vertical plane errors and horizontal plane errors; and

means responsive to said error signals for selectively rotating said plane reflector so as to reduce said deflection errors.

5. An antenna device according to claim 4 wherein said means responsive to said error signals includes means for generating respective control signals corresponding to said vertical plane and horizontal plane error signals, said plane reflector being selectively rotated in response to said control signals.

6. An antenna device according to claim 5 wherein said means responsive to said error signals further includes motor means responsive to said control signals and coupled to said plane reflector for selectively rotating said plane reflector to reduce said deflection errors.