Asymmetric-element reflect array antenna
First Claim
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1. A patch antenna element, comprising:
- a non-electrically conducting substrate;
a patch antenna element;
a plurality of notches formed in the antenna element an angularly displaced around the circumference of the patch antenna element;
a plurality of stub short transmission lines, each stub positioned in one of the plurality of notches; and
a plurality of switches individually coupled to an end of one notch and to one of the plurality of stub short transmission lines.
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Abstract
A reflect array antenna comprises a non-electrically conductive substrate with an array of antenna elements supported on the substrate. Each antenna element comprises a plurality of patch radiating elements arranged in rows and columns. Each patch radiating element comprises a plurality of notches formed in the element, the notches being angularly displaced around the circumference of the element. A plurality of stub short transmission lines are individually positioned in each of the plurality of notches and a plurality of switches individually couple one end of a notch to one of the plurality of stub short transmission lines.
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Citations
27 Claims
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1. A patch antenna element, comprising:
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a non-electrically conducting substrate;
a patch antenna element;
a plurality of notches formed in the antenna element an angularly displaced around the circumference of the patch antenna element;
a plurality of stub short transmission lines, each stub positioned in one of the plurality of notches; and
a plurality of switches individually coupled to an end of one notch and to one of the plurality of stub short transmission lines. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A reflect array antenna, comprising:
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a non-electrically conductive substrate;
an antenna array supported on the substrate, each antenna of the array comprising;
a patch antenna element;
a plurality of notches formed in the patch antenna element and angularly displaced around a circumference of the patch antenna element;
a plurality of stub short transmission line, each stub positioned in one of the plurality of notches; and
a plurality of switches individually coupled to an end of one notch and to one of the plurality of stub short transmission lines. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A circularly polarized reflect array antenna, comprising:
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a support substrate;
a plurality of subarrays supported on the support substrate, each subarray comprising a plurality of antenna elements, each antenna element comprising;
a patch antenna element;
a plurality of notches formed in the patch antenna element and angularly displaced around a circumference of the patch antenna element;
a plurality of stub short transmission lines, each stub positioned in one of the plurality of notches; and
a plurality of switches individually coupled to an end of one notch and to one of the plurality of stub short transmission lines. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
a scanning array controller coupled to each of the plurality of switches to activate each switch to scan the reflect array antenna in a controlled pattern.
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25. A circularly polarized reflect array antenna, comprising:
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a plurality of subarrays supported on a support base, each subarray comprising a plurality of antenna elements, each antenna element comprising;
a patch antenna element;
a plurality of notches formed in the patch antenna element and angularly displaced around a circumference of the patch antenna element;
a plurality of stub short transmission lines each stub positioned in one of the plurality of notches;
a plurality of switches individually coupled to an end of one notch and to one of the plurality of stub short transmission lines;
a feed horn coupled to the support base for transmitting or receiving radio frequency energy; and
a subreflector supported on the support base for focusing radio frequency energy from the feed horn to the plurality of subarrays. - View Dependent Claims (26, 27)
a scanning array controller coupled to each of the plurality of switches to activate each switch to scan the reflect array antenna in a controlled pattern.
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27. The circularly polarized reflect array antenna as in claim 26 wherein the support base comprises a semiconductor substrate with a ground plane;
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further comprising a plated via for shorting the patch antenna elements to the ground plane.
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Specification