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Method and device for coupling cancellation of closely spaced antennas

A technology of antenna elements and antenna systems, applied in antenna coupling, independent non-interactive antenna combinations, antennas, etc., can solve impractical problems

Inactive Publication Date: 2013-02-13
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method and device for coupling cancellation of closely spaced antennas
  • Method and device for coupling cancellation of closely spaced antennas
  • Method and device for coupling cancellation of closely spaced antennas

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Embodiment Construction

[0034] In a general lossless multiple-antenna system with N ports, the power of the signal received or transmitted by antenna port i is reduced by a factor of 1 minus the sum of the squared magnitudes of the scattering coefficients associated with that port.

[0035] P i = 1 - Σ j ≠ 1 N | S ji | 2 - - - ( 1 )

[0036] In the case of transmission, this relationship is quite pronounced, since reflected and coupled power is absorbed in the load of the port. However, due to reciprocity, this relationship also holds when the antenna system is used for reception. Instead of being received by the other antenna ports, the energy of th...

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Abstract

An antenna system comprising at least two antenna radiating elements and respective reference ports the ports being defined by a symmetrical antenna scattering N×N matrix. The system further comprises a compensating network connected to the reference ports. The compensating network is arranged for counteracting coupling between the antenna radiating elements. The compensating network is defined by a symmetrical compensating scattering 2N×2N matrix comprising four N×N blocks, the two blocks on the main diagonal containing all zeros and the other two blocks of the other diagonal containing a unitary N×N matrix and its transpose. The product between the unitary matrix, the scattering N×N matrix and the transpose of the unitary matrix equals an N×N matrix which essentially is a diagonal matrix. The present invention also relates to a method for calculating a compensating scattering 2N×2N matrix for a compensating network for an antenna system.

Description

technical field [0001] The invention relates to an antenna system comprising at least two antenna elements having respective radiating elements and respective reference ports defined by a symmetric antenna scattering NxN matrix, the system further comprising The ports are connected and a compensation network having corresponding at least two network ports is arranged to cancel the coupling between the antenna radiating elements. [0002] The invention also relates to a method for calculating a compensation scatter 2Nx2N matrix for a compensation network for an antenna system comprising at least two antenna elements with respective radiating elements and respective reference ports, wherein the compensation A network is arranged to be connected to the reference ports and has corresponding at least two network ports, the compensation network is arranged to cancel the coupling between the antenna radiating elements, wherein the method comprises the steps of: using a symmetric ante...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/52H01Q21/28
CPCH01Q1/52H01Q21/28H01Q21/00
Inventor A·德纳伊德A·斯特杰恩曼
Owner TELEFON AB LM ERICSSON (PUBL)