Scanning beam antenna with linear array feed
First Claim
1. An antenna arrangement comprising:
- a main reflector capable of bidirectionally reflecting a wavefront of electromagnetic energy along a feed axis of the antenna arrangement, the main reflector being curved along a first and second orthogonal axis on a reflecting surface of the main reflector in a first and a second orthogonal plane, respectively, to produce a first and a second focal point, respectively, at a respective separate first and a second predetermined location along the feed axis of the antenna arrangement;
a subreflector disposed on the feed axis of the antenna arrangement between the first and second focal point of the main reflector, the subreflector including a first and a second reflecting surface configuration in the first and the second orthogonal plane, respectively, to form an image line of the first axis on the surface of the main reflector, which image line intersects a secondary focal line formed by the combination of the main reflector and the subreflector in the second plane; and
a linear phased array feed capable of launching or receiving a wavefront of electromagnetic energy, the feed being disposed on the image line of the first axis on the surface of the main reflector and lying in the first plane of the subreflector.
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Accused Products
Abstract
The present invention relates to a scanning beam antenna comprising a doubly-curved main reflector, a doubly-curved subreflector and at least one linear array feed. The main reflector is doubly-curved in two planes to produce a separate first focus for each feed in a first plane in front of the subreflector and a separate second focus for each feed in a second orthogonal plane behind the subreflector. The subreflector is curved to refocus each second focus of the main reflector to coincide with the image line of a first axis on the reflecting surface of the main reflector in the first plane. Each feed array is disposed at a separate secondary focus of the combination of the main reflector and subreflector. The resulting antenna provides very little phase error due to aberrations as each beam is linearly scanned.
159 Citations
5 Claims
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1. An antenna arrangement comprising:
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a main reflector capable of bidirectionally reflecting a wavefront of electromagnetic energy along a feed axis of the antenna arrangement, the main reflector being curved along a first and second orthogonal axis on a reflecting surface of the main reflector in a first and a second orthogonal plane, respectively, to produce a first and a second focal point, respectively, at a respective separate first and a second predetermined location along the feed axis of the antenna arrangement; a subreflector disposed on the feed axis of the antenna arrangement between the first and second focal point of the main reflector, the subreflector including a first and a second reflecting surface configuration in the first and the second orthogonal plane, respectively, to form an image line of the first axis on the surface of the main reflector, which image line intersects a secondary focal line formed by the combination of the main reflector and the subreflector in the second plane; and a linear phased array feed capable of launching or receiving a wavefront of electromagnetic energy, the feed being disposed on the image line of the first axis on the surface of the main reflector and lying in the first plane of the subreflector. - View Dependent Claims (2, 3, 4, 5)
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Specification
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- Resources
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Current AssigneeBell Telephone Laboratories, Inc. (Nokia Corporation)
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Original AssigneeAT&T, Inc.
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InventorsGans, Michael J.
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Primary Examiner(s)NOT, DEFINED
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Application NumberUS06/620,722Time in Patent Office859 DaysField of Search343/781 R, 343/781 P, 343/781 CH, 343/835, 343/836, 343/837, 343/840, 343/914US Class Current343/781.00PCPC Class CodesH01Q 19/19 comprising one main concave...H01Q 3/2658 Phased-array fed focussing ...
