SIMULTANEOUS TRANSMIT AND RECEIVE ANTENNA SYSTEM
First Claim
1. A simultaneous transmit and receive (STAR) antenna system, comprising:
- a ring array of transmit antenna elements equally angularly distributed about a ring axis, each of the transmit antenna elements having a phase relative to the phase of the other transmit antenna elements wherein the phases increase linearly according to an angular position in the ring array and wherein the phases for an opposite pair of transmit antenna elements differ by 180 degrees;
a ground plane disposed under the ring array of transmit antenna elements;
an electrically-conductive cylinder disposed on the ring axis above the ground plane;
a top ground plane disposed at an end of the electrically-conductive cylinder opposite the ground plane; and
a receive antenna element disposed on the ring axis above the electrically-conductive cylinder and top ground plane, wherein a path between each transmit antenna element and the receive antenna element is at least partially obscured by at least one of the electrically-conductive cylinder and the top ground plane to thereby increase isolation between the transmit antenna elements and the receive antenna element.
1 Assignment
0 Petitions
Accused Products
Abstract
Described is a simultaneous transmit and receive antenna system having a ring array of transmit antenna elements and a receive antenna element disposed on an axis that is perpendicular to and passing through the center of the ring array. Alternatively, the ring array includes receive elements and a transmit antenna element is disposed on the axis perpendicular to the ring array. Opposite antenna elements in the ring array differ in phase by 180° so that a radiation pattern null occurs at the antenna element at the center of the ring array. Also included are at least one ground plane and an electrically-conductive cylinder disposed on the perpendicular axis inside the ring array to provide a high degree of isolation between the transmit and receive antenna elements. The system may be configured for wireless communications, for example, according to WIFI IEEE standard 802.11 or WIMAX IEEE standard 802.16.
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Citations
34 Claims
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1. A simultaneous transmit and receive (STAR) antenna system, comprising:
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a ring array of transmit antenna elements equally angularly distributed about a ring axis, each of the transmit antenna elements having a phase relative to the phase of the other transmit antenna elements wherein the phases increase linearly according to an angular position in the ring array and wherein the phases for an opposite pair of transmit antenna elements differ by 180 degrees; a ground plane disposed under the ring array of transmit antenna elements; an electrically-conductive cylinder disposed on the ring axis above the ground plane; a top ground plane disposed at an end of the electrically-conductive cylinder opposite the ground plane; and a receive antenna element disposed on the ring axis above the electrically-conductive cylinder and top ground plane, wherein a path between each transmit antenna element and the receive antenna element is at least partially obscured by at least one of the electrically-conductive cylinder and the top ground plane to thereby increase isolation between the transmit antenna elements and the receive antenna element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A simultaneous transmit and receive (STAR) antenna system, comprising:
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a ring array of transmit antenna elements equally angularly distributed about a ring axis, each of the transmit antenna elements having a phase relative to the phase of the other transmit antenna elements wherein the phases increase linearly according to an angular position in the ring array and wherein the phases for an opposite pair of transmit antenna elements differ by 180 degrees; a ground plane disposed under the ring array of transmit antenna elements; and a receive antenna element disposed on the ring axis above the ring array. - View Dependent Claims (17)
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18. A simultaneous transmit and receive (STAR) antenna system, comprising:
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a ring array of transmit antenna elements equally angularly distributed about a ring axis, each of the transmit antenna elements having a phase relative to the phase of the other transmit antenna elements wherein the phases increase linearly according to an angular position in the ring array of transmit antenna elements and wherein the phases for an opposite pair of transmit antenna elements differ by 180 degrees; a first ground plane disposed under the ring array of transmit antenna elements; an electrically-conductive cylinder disposed on the ring axis above the first ground plane; a second ground plane disposed at an end of the electrically-conductive cylinder opposite the first ground plane; and a ring array of receive antenna elements equally angularly distributed about the ring axis and disposed above the second ground plane, each of the receive antenna elements having a phase relative to the phase of the other receive antenna elements wherein the phases increase linearly according to an angular position in the ring array of receive antenna elements and wherein the phases for an opposite pair of receive antenna elements differ by 180 degrees. - View Dependent Claims (19)
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20. A simultaneous transmit and receive (STAR) antenna system, comprising:
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an upper truncated conical section having an electrically-conductive surface; a lower truncated conical section having an electrically-conductive surface; a ring array of transmit antenna elements equally angularly distributed about a ring axis and disposed between the upper and lower truncated conical sections, each of the transmit antenna elements having a phase relative to the phase of the other transmit antenna elements wherein the phases increase linearly according to an angular position in the ring array and wherein the phases for an opposite pair of transmit antenna elements differ by 180 degrees; an electrically-conductive cylinder disposed above the upper truncated conical section; a top ground plane disposed at an end of the electrically-conductive cylinder opposite the upper truncated conical section; and a conical receive antenna element disposed on the ring axis above the top ground plane. - View Dependent Claims (21, 22, 23)
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24. A simultaneous transmit and receive (STAR) antenna system, comprising:
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an upper truncated conical section having an electrically-conductive surface; a lower truncated conical section having an electrically-conductive surface; a ring array of transmit antenna elements equally angularly distributed about a ring axis and disposed between the upper and lower truncated conical sections, each of the transmit antenna elements having a phase relative to the phase of the other transmit antenna elements wherein the phases increase linearly according to an angular position in the ring array and wherein the phases for an opposite pair of transmit antenna elements differ by 180 degrees; a lower conical section having an electrically-conductive surface and being disposed above the upper truncated conical section; an upper conical section having an electrically-conductive surface and being disposed above the lower conical section; and a receive antenna element disposed between the lower and upper conical sections. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A simultaneous transmit and receive (STAR) antenna system, comprising:
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a ring array of receive antenna elements equally angularly distributed about a ring axis, each of the receive antenna elements having a phase relative to the phase of the other receive antenna elements wherein the phases increase linearly according to an angular position in the ring array and wherein the phases for an opposite pair of receive antenna elements differ by 180 degrees; a ground plane disposed under the ring array of receive antenna elements; an electrically-conductive cylinder disposed on the ring axis above the ground plane; a top ground plane disposed at an end of the electrically-conductive cylinder opposite the ground plane; and a transmit antenna element disposed on the ring axis above the electrically-conductive cylinder and top ground plane, wherein a path between each receive antenna element and the transmit antenna element is at least partially obscured by at least one of the electrically-conductive cylinder and the top ground plane to thereby increase isolation between the receive antenna elements and the transmit antenna element.
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31. A simultaneous transmit and receive (STAR) antenna system, comprising:
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a ring array of receive antenna elements equally angularly distributed about a ring axis, each of the receive antenna elements having a phase relative to the phase of the other receive antenna elements wherein the phases increase linearly according to an angular position in the ring array and wherein the phases for an opposite pair of receive antenna elements differ by 180 degrees; a ground plane disposed under the ring array of receive antenna elements; and a transmit antenna element disposed on the ring axis above the ring array.
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32. A simultaneous transmit and receive (STAR) antenna system, comprising:
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a ring array of receive antenna elements equally angularly distributed about a ring axis, each of the receive antenna elements having a phase relative to the phase of the other receive antenna elements wherein the phases increase linearly according to an angular position in the ring array of receive antenna elements and wherein the phases for an opposite pair of receive antenna elements differ by 180 degrees; a first ground plane disposed under the ring array of receive antenna elements; an electrically-conductive cylinder disposed on the ring axis above the ground plane; a second ground plane disposed at an end of the electrically-conductive cylinder opposite the first ground plane; and a ring array of transmit antenna elements equally angularly distributed about the ring axis and disposed above the second ground plane, each of the transmit antenna elements having a phase relative to the phase of the other transmit antenna elements wherein the phases increase linearly according to an angular position in the ring array of transmit antenna elements and wherein the phases for an opposite pair of transmit antenna elements differ by 180 degrees.
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33. A simultaneous transmit and receive (STAR) antenna system, comprising:
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an upper truncated conical section having an electrically-conductive surface; a lower truncated conical section having an electrically-conductive surface; a ring array of receive antenna elements equally angularly distributed about a ring axis and disposed between the upper and lower truncated conical sections, each of the receive antenna elements having a phase relative to the phase of the other receive antenna elements wherein the phases increase linearly according to an angular position in the ring array and wherein the phases for an opposite pair of receive antenna elements differ by 180 degrees; an electrically-conductive cylinder disposed above the upper truncated conical section; a top ground plane disposed at an end of the electrically-conductive cylinder opposite the upper truncated conical section; and a conical transmit antenna element disposed on the ring axis above the top ground plane.
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34. A simultaneous transmit and receive (STAR) antenna system, comprising:
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an upper truncated conical section having an electrically-conductive surface; a lower truncated conical section having an electrically-conductive surface; a ring array of receive antenna elements equally angularly distributed about a ring axis and disposed between the upper and lower truncated conical sections, each of the receive antenna elements having a phase relative to the phase of the other receive antenna elements wherein the phases increase linearly according to an angular position in the ring array and wherein the phases for an opposite pair of receive antenna elements differ by 180 degrees; a lower conical section having an electrically-conductive surface and being disposed above the upper truncated conical section; an upper conical section having an electrically-conductive surface and being disposed above the lower conical section; and a transmit antenna element disposed between the lower and upper conical sections.
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Specification