Systems and methods employing coupling elements to increase antenna isolation
First Claim
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1. An antenna system comprising:
- a first antenna element;
a second antenna element, wherein electromagnetic coupling occurs between the first antenna element and the second antenna element such that a current IExcite in the first element causes a current IDirect in the second antenna element; and
a coupling element disposed between the first and second antenna elements and mutually coupled to the first and second antenna elements such that the coupling element causes a current ICancel, wherein ICancel at least partially cancels IDirect by at least −
10 dB, wherein a total coupled current in the second antenna element is ICouple, wherein ICouple is equal to IDirect plus ICancel and is negligible.
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Abstract
An antenna system comprises a first antenna element mutually coupled with a second antenna element, the mutual coupling between the first and second antenna elements causing a first current in the second antenna element, and a coupling element disposed at least partially between the first and second antenna elements, wherein the coupling element is mutually coupled to each of the first and second antenna elements, and wherein the coupling element is configured to induce a second current in the second antenna element that at least partially cancels the first current.
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Citations
22 Claims
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1. An antenna system comprising:
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a first antenna element; a second antenna element, wherein electromagnetic coupling occurs between the first antenna element and the second antenna element such that a current IExcite in the first element causes a current IDirect in the second antenna element; and a coupling element disposed between the first and second antenna elements and mutually coupled to the first and second antenna elements such that the coupling element causes a current ICancel, wherein ICancel at least partially cancels IDirect by at least −
10 dB, wherein a total coupled current in the second antenna element is ICouple, wherein ICouple is equal to IDirect plus ICancel and is negligible. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for increasing isolation in an antenna system, wherein the antenna system comprises a first antenna element, a second antenna element, and coupling element, said method comprising:
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exciting a first current in said first antenna element; directly inducing by said first current a second current in said second antenna element; inducing a third current by said first current in said coupling element; and inducing a fourth current by said third current in said second antenna element, said fourth current being out of phase with said second current and reducing effects of mutual coupling between said first and second antenna elements. - View Dependent Claims (9, 10, 11)
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12. An antenna system comprising:
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a first antenna element mutually coupled with a second antenna element, said mutual coupling between said first and second antenna elements causing a first current in said second antenna element; and a coupling element disposed at least partially between said first and second antenna elements, said coupling element mutually coupled to each of said first and second antenna elements; said coupling element configured to induce a second current in said second antenna element that at least partially cancels said first current, wherein said antenna system comprises a Three-Dimensional (3D) array. - View Dependent Claims (13, 14, 15, 16)
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17. An antenna system comprising:
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a first antenna element mutually coupled with a second antenna element, said mutual coupling between said first and second antenna elements causing a first current in said second antenna element, wherein said first and second antenna elements comprise Planar Inverted F Antenna (PIFA) elements; and a coupling element disposed at least partially between said first and second antenna elements, said coupling element mutually coupled to each of said first and second antenna elements; said coupling element configured to induce a second current in said second antenna element that at least partially cancels said first current. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification