Wireless communications device having a compact antenna cluster
First Claim
Patent Images
1. A wireless communication device comprising:
- at least one signal processing device; and
a cluster of N multiple port antennas, which is capable of simultaneous transmission and/or reception of signals with relatively low correlation between the signals, is coupled to the at least one signal processing device where at least one pair of the antenna ports operating at a frequency, f, are placed within a volume of space whose longest linear dimension is λ
/3 or less where λ
is equal to c/f and N is an integer equal to 2 or greater.
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Abstract
A wireless communication device comprising a signal processing device coupled to a cluster of multiple port antennas that can simultaneously transmit and/or receive communication signals. The cluster of antennas operates within a frequency band having maximum frequency f, and at least a pair of the antenna ports is placed in a volume of space whose longest linear dimension is λ/3 or less where λ is equal to c/f. During operation of the antenna cluster, the radiation patterns from different antennas have main lobes that point in different directions and have correlations of 0.7 or less with respect to each other.
83 Citations
30 Claims
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1. A wireless communication device comprising:
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at least one signal processing device; and
a cluster of N multiple port antennas, which is capable of simultaneous transmission and/or reception of signals with relatively low correlation between the signals, is coupled to the at least one signal processing device where at least one pair of the antenna ports operating at a frequency, f, are placed within a volume of space whose longest linear dimension is λ
/3 or less where λ
is equal to c/f and N is an integer equal to 2 or greater.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of constructing an antenna cluster comprising N multiple port antennas capable of simultaneously transmitting and/or receiving communication signals while maintaining a relatively low correlation between signals of antennas in the cluster where N is an integer equal to 2 or greater, the method comprising the step of:
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positioning and orienting the antennas in the cluster such that during operation of the antenna cluster at a frequency f, resulting radiation patterns of each operating antenna port have a main lobe that points in a direction that is different from the direction pointed to by any other lobe and at least a pair of the antenna ports are placed in a volume of space whose longest linear dimension is λ
/3 or less where λ
is equal to c/f.- View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
adjusting the positioning and orientation of antennas in the cluster;
calculating the resulting radiation pattern of each of the operating antenna ports; and
calculating correlations between the resulting radiation patterns.
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25. The method of claim 24 where the step of calculating the resulting radiation pattern comprises the step of using a programmed computer to calculate the radiation pattern.
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26. The method of claim 24 where the step of adjusting the positioning and orientation of the antennas comprises the step of directing the antennas such that the antenna ports have non-overlapping full width half maximum regions of their main lobes.
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27. The method of claim 24 where the step of adjusting the positioning and orientation of the antennas comprises the step of directing the antennas such that the correlation between the radiation patterns of any two operating antenna ports is reduced to 0.7 or below.
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28. The method of claim 24 where the step of adjusting the positioning and orientation of the antennas further comprises the step of placing one antenna in a resulting radiation null of another antenna port.
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29. The method of claim 24 where the step of adjusting the positioning and orientation of the antennas further comprises the step of obtaining a statistical distribution of achievable information transfer rate values by measuring a set of transmission matrices H as the position of scattering objects in the multipath environment changes.
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30. The method of claim 24 where the step of adjusting the positioning and orientation of the antennas further comprises the step of obtaining a statistical distribution of achievable information transfer rate values by measuring a set of transmission matrices H as the position of the antenna cluster is changed within the multipath environment.
Specification