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

AI Technical Summary

Problems solved by technology

[0007] However, if a common-point, 3-polarized loop antenna composed of 3 common loop antennas is used, there wi

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[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 3-polarized magnetic dipoles.

[0033] To build a common-point, low-coupling 3-polarized magnetic dipole MIMO antenna system, first, the center of the antenna unit must be located at the same point in space and kept perpendicular to each other to facilitate receiving the magnetic field components in the three polarization directions . Second, in order 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 the antenna elements large enough to obtain greater radiation efficiency.

[0034] In the present invention, a specially designed loop antenna with uniform current distribution is used to form a low-coupling, orthogonal 3-polarized magnetic dipole MIMO antenna (first loop ante...

Example Embodiment

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

[0051] The channel capacity of a communication system is an important indicator of system performance. 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 such a 3-polarized magnetic dipole antenna with the results of a 2-polarized magnetic dipole antenna. 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) in the structure.

[0052] The formula for calculating the channel capacity of the MIMO system is:

[0053]

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

[0055] Compared with a single-polarization system, a multi-polarization MIMO system generally can obtain a larger channel capacity gain in a...

Example Embodiment

[0061] Embodiment 3: As shown in the figure, the key point of the present invention is to use the principle of polarization diversity to propose a compact type consisting of three magnetic dipoles (the first loop antenna 1, the second loop antenna 2 and the third loop antenna). The loop antenna 3) consists of a 3-polarized MIMO antenna with a common geometric center, orthogonal, low coupling and high channel capacity.

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

[0063] This is a MIMO antenna system composed of three-polarized loop antennas. These loo...

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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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