MOBILE COMMUNICATIONS SYSTEMS AND METHODS RELATING TO POLARIZATION-AGILE ANTENNAS
First Claim
1. A mobile communication system comprising:
- a) a first terminal; and
b) a second terminal, the second terminal being mobile and capable of communicating with the first terminal via radio signals propagated through a changing propagation channel, the second terminal comprising;
i) a first polarization-agile antenna for transmission/reception of radio signals using any one of a plurality of polarization modes, andii) a polarization selector coupled to the first polarization-agile antenna to select one of the plurality of polarization orientations substantially matching a polarization orientation preferentially propagated through the changing propagation channel.
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Accused Products
Abstract
A wireless communication system can include polarization agile antennas to enable adaptation to the polarization characteristics of a changing propagation channel. In one embodiment, a mobile terminal can include one or more polarization-agile antennas, and can select polarization orientations that are preferentially propagated through the changing propagation channel. In another embodiment, a mobile terminal having two polarization-agile antennas can provide spatial diversity, polarization diversity, or combinations of both. Multiple-input multiple-output (MIMO) systems can include polarization-agile antennas to allow for switching between spatial and polarization diversity, combined spatial and polarization diversity, and various Eigen channel decompositions using spatial, polarization, and combined spatial and polarization dimensions. An extended polar normalization provides enhanced fidelity for methods of communications system modeling.
35 Citations
18 Claims
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1. A mobile communication system comprising:
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a) a first terminal; and b) a second terminal, the second terminal being mobile and capable of communicating with the first terminal via radio signals propagated through a changing propagation channel, the second terminal comprising; i) a first polarization-agile antenna for transmission/reception of radio signals using any one of a plurality of polarization modes, and ii) a polarization selector coupled to the first polarization-agile antenna to select one of the plurality of polarization orientations substantially matching a polarization orientation preferentially propagated through the changing propagation channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A polarization agile antenna comprising:
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a ground plane; a patch surface disposed proximate to the ground plane; a first feed coupled to the ground plane and the patch surface, the first feed disposed at a position on a first diagonal extending from a center of the patch surface to a first corner of the patch surface; a second feed coupled to the ground plane and the patch surface, the second feed disposed at a position on a second diagonal extending from a center of the patch surface to a second corner of the patch surface adjacent to the first corner; and three switches electrically connected between the ground plane and the patch surface, one switch disposed at a center of each side of the patch surface except for the side of the patch between the first corner and the second corner, a polarization orientation of the antenna determined by the state of the switches and relative power distribution between the first feed and the second feed. - View Dependent Claims (17)
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18. A method for predicting the performance of a mobile communication system having communications terminals communicating through a communication link, the method comprising:
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forming a model of the communications terminals; creating a channel model of a changing propagation channel of the communication link including an accounting of polarization-dependent propagation effects; normalizing a channel matrix portion of the channel model using an extended polar normalization; and predicting performance of the mobile communication system using the communication terminal models and the channel model.
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Specification