Wide-field-of-view antenna arrangement

• US 4,355,314 A
• Filed: 11/28/1980
• Issued: 10/19/1982
• Est. Priority Date: 11/28/1980
• Status: Expired due to Term

• Current Assignee: Bell Telephone Laboratories, Inc. (Nokia Corporation)
• Original Assignee: Bell Telephone Laboratories, Inc. (Nokia Corporation)
• Inventors: Ohm, Edward A.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US06/211,104
• Time in Patent Office: 690 Days
• Field of Search: 343/779, 343/781 P, 343/781 CA, 343/836
• US Class Current: 343/779
• CPC Class Codes: H01Q 19/19 comprising one main concave reflecting surface associated with an auxiliary reflecting surface
• CPC Class Codes: H01Q 25/007 using two or more primary active elements in the focal region of a focusing device for operation on different wavebands H01Q5/22

Abstract

The present invention relates to a wide-field-of-view antenna arrangement which permits the angular range over which multiple beams may be transmitted or received to be increased by taking into consideration the location of the tangential and sagittal focal regions associated with multibeam systems. The subreflector (18,24) is positioned relative to the main reflector (10,20) such that the tangential and sagittal focal regions lie behind the subreflector of a Cassegrainian arrangement, or alternatively in front of the subreflector of a Gregorian arrangement for a predetermined wide-field-of-view.

Claims

1. A wide-field-of-view antenna system capable of transmitting or receiving a plurality of beams (14) comprising in combination:

a main focusing reflector (10,20) including a reflecting surface, a boresight axis (12) and a paraxial focus (P), said reflector producing a tangential focal region and a sagittal focal region associated with each beam of said plurality of beams;

a feed arrangement (17,19) disposed to permit the transmitting or receiving of each beam of said plurality of beams along a separate associated predetermined direction (Φ

) with respect to said boresight axis over a wide-field-of-view; and

a subreflector (18,24) including a reflecting surface capable of directing said plurality of beams between said main reflector and said feed arrangement;

characterized in that

the subreflector is located in relation to the main reflector such that both the plurality of tangential focal regions and the plurality of sagittal focal regions remain on the same side of said subreflector as the paraxial focus and do not intersect the reflecting surface of said subreflector for any predetermined transmitting or receiving direction.

2. A wide-field-of-view antenna system in accordance with claim 1

characterized in that

the subreflector (24) includes an ellipsiodal reflecting surface, said subreflector positioned in relation to the main reflector such that both the plurality of tangential focal regions and the plurality of sagittal focal regions are located between and do not intersect the reflecting surfaces of said main reflector and said subreflector.

3. A wide-field-of-view antenna system in accordance with claim 1

characterized in that

the subreflector (18) includes a hyperboloidal reflecting surface, said subreflector positioned in relation to the main reflector such that both the plurality of tangential focal regions and the plurality of sagittal focal regions are located behind and do not intersect the reflecting surface of said subreflector.