Reflectarray
First Claim
1. A reflectarray for use in combination with a spaced apart antenna feed element, the reflectarray reflecting energy at first and second different frequencies to and/or from said antenna feed element, the reflectarray comprising:
- a first array of conductive patches supported by a substrate, wherein each conductive patch in the first array has a first center line along a Y-direction and a second centerline along an X-direction, the conductive patches each having a length dimension and a width dimension, the length dimension being algebraically related to said first frequency and the width dimension being algebraically related to said second frequency for reflecting energy impinging the patches of said first array (i) at said first and second different frequencies and (ii) with different polarizations;
a plurality of first variable capacitors, wherein each first variable capacitor is electrically coupled to one of the conductive patches in the first array along the first centerline; and
a plurality of second variable capacitors, wherein each second variable capacitor is electrically coupled to one of the conductive patches in the first array along the second centerline.
1 Assignment
0 Petitions
Accused Products
Abstract
A reflectarray is disclosed. The reflectarray includes a first array of conductive patches supported by a substrate, wherein each conductive patch in the first array has a first center line along a Y-direction and a second centerline along an X-direction, a plurality of first variable capacitors, wherein each first variable capacitor is electrically coupled to one of the conductive patches in the first array along the first centerline, and a plurality of second variable capacitors, wherein each second variable capacitor is electrically coupled to one of the conductive patches in the first array along the second centerline.
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Citations
27 Claims
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1. A reflectarray for use in combination with a spaced apart antenna feed element, the reflectarray reflecting energy at first and second different frequencies to and/or from said antenna feed element, the reflectarray comprising:
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a first array of conductive patches supported by a substrate, wherein each conductive patch in the first array has a first center line along a Y-direction and a second centerline along an X-direction, the conductive patches each having a length dimension and a width dimension, the length dimension being algebraically related to said first frequency and the width dimension being algebraically related to said second frequency for reflecting energy impinging the patches of said first array (i) at said first and second different frequencies and (ii) with different polarizations; a plurality of first variable capacitors, wherein each first variable capacitor is electrically coupled to one of the conductive patches in the first array along the first centerline; and a plurality of second variable capacitors, wherein each second variable capacitor is electrically coupled to one of the conductive patches in the first array along the second centerline. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of making a reflectarray antenna, the method comprising:
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directing an antenna feed element towards a reflectarray, the reflectarray reflecting energy at first and second different frequencies to and/or from said antenna feed element; forming said reflectarray of a first array of conductive patches on a substrate, wherein each conductive patch in the first array has a first center line along a Y-direction and a second centerline along an X-direction, the conductive patches each having a length dimension and a width dimension, the length dimension being algebraically related to said first frequency and the width dimension being algebraically related to said second frequency; coupling each first variable capacitor of a plurality of first variable capacitors to one of the conductive patches in the first array along the first centerline; and coupling each second variable capacitor of a plurality of second variable capacitors to one of the conductive patches in the first array along the second centerline. - View Dependent Claims (19)
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20. A reflectarray for use in combination with a spaced apart antenna feed element, the reflectarray reflecting energy at first and second different frequencies to and/or from said antenna feed element, the reflectarray comprising:
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an array of conductive patches supported by a substrate, wherein each conductive patch in said array has a first centerline along a first direction and a second centerline along a second direction, the conductive patches each having a length dimension and a width dimension, the length dimension being algebraically related to said first frequency and the width dimension being algebraically related to said second frequency for reflecting energy impinging the patches of said array (i) at said first and second different frequencies and (ii) with different polarizations; a plurality of first variable capacitors, wherein each first variable capacitor is electrically coupled to one of the conductive patches in the array along the first centerline; a plurality of parasitic elements wherein each parasitic element is disposed adjacent to each of the conductive patches in the array of conductive patches; and a plurality of second variable capacitors, wherein each second variable capacitor is electrically coupled to one of the adjacent parasitic elements the second centerline.
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21. A method of operating a reflectarray antenna at first and second different frequencies, the method comprising:
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supporting an array of conductive patches by a substrate, wherein each conductive patch in said array has a first centerline along a first direction and a second centerline along a second orthogonal direction, the conductive patches each having a length dimension and a width dimension, the length dimension being algebraically related to said first frequency and the width dimension being algebraically related to said second frequency; a plurality of first variable capacitors, wherein each first variable capacitor is electrically coupled to one of the conductive patches in the array along the first centerline; a plurality of second variable capacitors, wherein each second variable capacitor is electrically coupled to one of the conductive patches in the array along the second centerline; varying a voltage applied to said plurality of first variable capacitors whereby a phase of reflected energy from said reflectarray is polarized along a first direction is thereby varied; and varying a voltage applied to said plurality of second variable capacitors whereby a phase of reflected energy polarized along a second direction is thereby varied.
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22. A reflectarray for use in combination with a spaced apart antenna feed element, the reflectarray reflecting energy at first and second different frequencies to and/or from said antenna feed element, the reflectarray comprising:
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first and second arrays of conductive patches disposed by a substrate, each conductive patch of the first array having a length dimension and a width dimension, the length dimension being longer than the width dimension and therefor having a corresponding direction of elongation, the length dimension of each conductive patch of the first array being algebraically related to said first frequency and the width dimension of each conductive patch of the first array being algebraically related to said second frequency for reflecting energy impinging the patches of said first array at said first and second different frequencies, each conductive patch of the second array having a length dimension and a width dimension, the length dimension of the patches of the second array being longer than the width dimension of the patches of the second array and therefor having a corresponding direction of elongation, the patches of the first array being disposed with their directions of elongation being parallel to one another, the patches of the second array being disposed with their directions of elongation being (i) parallel to one another and (ii) orthogonal to the directions of elongation of the patches of the first array whereby the reflectarray reflects energy at said first and second different frequencies and at each of two different orthogonal directions of polarization. - View Dependent Claims (23)
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24. A reflectarray comprising:
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a first array of conductive patches supported by a substrate, wherein each conductive patch in the first array has a first center line along a Y-direction and a second centerline along an X-direction; a plurality of first variable capacitors, wherein each first variable capacitor is electrically coupled to one of the conductive patches in the first array along the first centerline; and a plurality of second variable capacitors, wherein each second variable capacitor is electrically coupled to one of the conductive patches in the first array along the second centerline, wherein the variable capacitor from the plurality of first variable capacitors and the variable capacitors from the plurality of second variable capacitors are asymmetrically coupled to the first array of conductive patches. - View Dependent Claims (25, 26, 27)
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Specification