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Tripolar magneto-dipole MIMO (multiple input multiple output) antenna system

A magnetic dipole and antenna technology, applied in the field of 3-polarized magnetic dipole MIMO antenna system, can solve the problems of low radiation efficiency and unusability of the antenna, and achieve the effect of high channel capacity

Inactive Publication Date: 2014-12-17
COMMUNICATION UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, if a common-point, 3-polarized loop antenna composed of 3 common loop antennas is used, there will be a large coupling between them, resulting in low radiation efficiency of the antenna and making it unusable

Method used

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Embodiment 1

[0031] Example 1: As shown in the figure,

[0032] The invention discloses a MIMO antenna system with uniform current distribution, common point, low coupling, and orthogonal three-polarized magnetic dipoles.

[0033] To construct a common-point, low-coupling 3-polarized magnetic dipole MIMO antenna system, first, the centers of the antenna elements should be located at the same point in space and kept perpendicular to each other, so as to facilitate receiving the magnetic field components of the three polarization directions . Second, to obtain a radiation pattern similar to that of a magnetic dipole, the current on the ring needs to have a uniform distribution. Finally, it is more important to make the isolation between antenna elements large enough to obtain greater radiation efficiency.

[0034] In the present invention, a low-coupling, orthogonal 3-polarized magnetic dipole MIMO antenna (the first loop antenna 1, the second loop antenna 2 and the third loop antenna) is ...

Embodiment 2

[0050] Example 2: As shown in the figure,

[0051] The channel capacity of a communication system is an important index to measure the performance of the system. It refers to the maximum information rate that a channel can transmit without errors. The following compares the channel capacity of the MIMO system composed of this 3-polarized magnetic dipole antenna with the result of the 2-polarized magnetic dipole antenna, in which the 2-polarized magnetic dipole antenna is composed of figure 1 The first loop antenna 1 (magnetic dipole) and the second loop antenna 2 (magnetic dipole) are formed.

[0052] The channel capacity calculation formula of MIMO system is:

[0053]

[0054] Here I is a 3×3 identity matrix, n T is the number of transmitting antennas, SNR is the receiving signal-to-noise ratio, set to 20dB, is the conjugate transpose of matrix H.

[0055] Compared with single-polarization systems, multi-polarization MIMO systems can generally obtain larger channel ca...

Embodiment 3

[0061] Embodiment 3: as shown in the figure, the key point of the present invention is to utilize the polarization diversity principle, proposes a kind of compact, by 3 magnetic dipoles (the first loop antenna 1, the second loop antenna 2 and the third The loop antenna 3) is a 3-polarized MIMO antenna with co-pointing geometric centers, orthogonal, low coupling, and high channel capacity.

[0062] The core problem of realizing high isolation when three loop antennas are compact and orthogonal is solved. The antenna can be used in a multi-polarization MIMO communication system, and can realize the acquisition of magnetic field components in three orthogonal directions, thereby increasing the channel capacity. It can also be used as a reference antenna for electromagnetic vector detectors (EMVS). The specific features of this antenna are described as follows:

[0063] This is a MIMO antenna system composed of three-polarized loop antennas, which have uniform current distributi...

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Abstract

The invention relates to a tripolar magneto-dipole MIMO (multiple input multiple output) antenna system and belongs to the technical field of wireless communication systems. A tripolar magneto-dipole MIMO antenna is composed of a first loop antenna, a second loop antenna and a third loop antenna which are mutually orthogonal. Geometric centers of the first, the second and the third loop antennas are located at one spatial point and feed respectively. Each loop antenna has evenly distributed current; meanwhile, the first, the second and the third loop antennas are low in coupling; MIMO channel capacity is high accordingly. The compact MIMO antenna with high channel capacity is composed of the coincident low-coupled tripolar magneto-dipoles. Extraction and utilization of three magnetic field polarization components are achieved, and three polarization degrees of freedom of the magnetic field components can be acquired accordingly.

Description

technical field [0001] The invention relates to a triple-polarized magnetic dipole MIMO antenna system, which belongs to the technical field of wireless communication systems. Background technique [0002] Due to the great potential of MIMO technology in improving the channel capacity of wireless communication systems, it has been widely concerned by people. However, in order to obtain a larger channel capacity, it is required that the antenna for implementing the MIMO system can obtain a sufficiently large degree of spatial freedom. The spatial degree of freedom of a MIMO system refers to the number of independent sub-channels it can support. In a traditional MIMO system based on a single-polarized antenna, in order to obtain a sufficiently large degree of freedom in space, it is required that the element spacing of the transmitting and receiving antennas should be large enough. In a multipath-rich environment, the minimum inter-array element spacing is half a wavelength,...

Claims

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Application Information

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IPC IPC(8): H01Q7/00H01Q1/38H01Q1/52H01Q21/24
Inventor 朴大志郭庆新李增瑞毛懿杨玲玉
Owner COMMUNICATION UNIVERSITY OF CHINA
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