Planar compact low-coupling four-polarization MIMO antenna based on orthogonal mode

An orthogonal mode, quad-polarization technology, applied in antennas, resonant antennas, basically flat resonant elements, etc., can solve the problems of difficult removal of coupling between electric dipoles and loop antennas, less antenna design, and unfavorable integration. The effect of easy flat structure, compact structure and simple structure

CN113161730AActive Publication Date: 2021-07-23COMMUNICATION UNIVERSITY OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-07-23

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Abstract

The invention discloses a planar compact low-coupling four-polarization MIMO antenna based on an orthogonal mode, which comprises a first radiator and a second radiator based on the orthogonal mode, the first radiator adopts an annular structure, the second radiator adopts a microstrip patch structure, a radiation mode of an electric dipole (Ex) and a magnetic dipole (Hz) is obtained on the first radiator, and two orthogonal TM11 microstrip antenna modes (Hx, Hy) are obtained on the second radiator. According to the invention, the internal space of the first radiator is fully utilized, the second radiator is arranged in the first radiator, four polarization modes are obtained in a planar structure, and the antenna has the characteristics of compact structure, low coupling and the like; the TM11 mode working frequency of the second radiator is reduced through the fractal structure, and the second radiator and the first radiator work in the same frequency band. According to the invention, the vector characteristics of the electromagnetic field are effectively utilized, and the channel capacity greater than 3 * 3 and close to 4 * 4 independent identically distributed Rayleigh channels can be obtained in a multi-path rich propagation environment through a compact structure.
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Description

technical field

[0001] The invention relates to an antenna, in particular to a planar compact low-coupling four-polarization MIMO antenna based on an orthogonal mode, which can be used in the fields of wireless communication, large-scale MIMO antenna array and the like. Background technique

[0002] With the vigorous development of wireless communication technology, spectrum resources are becoming increasingly tight, and it is an inevitable trend to develop and utilize existing frequency bands as much as possible and improve spectrum utilization. Multiple-Input Multiple-Output (MIMO for short) technology can establish multiple parallel spatial sub-channels by using multiple transmitting antennas and receiving antennas at the transmitting end and receiving end respectively, without increasing spectrum resources and antennas. In the case of lower transmit power, the system channel quality can be doubled. In recent years, with the development of large-scale and ultra-large-sca...

Examples

Embodiment Construction

[0029] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] Such as figure 1 As shown, the four-polarized MIMO antenna of this embodiment is composed of a first radiator 1, a second radiator 2, an antenna ground metal plate 3, a dielectric plate 4, a T-shaped feed structure 5, and a feed port. The feed ports include a first feed port 6 , a second feed port 7 , a third feed port 8 and a fourth feed port 9 . Among them, the first feed port 6 uses a lumped port with a characteristic impedance of 50Ω to excite the inner ring of the first radiator 1, and the second feed port 7 uses an SMA coaxial cable with a characteristic impedance of 50Ω to feed power. The electrical structure 5 excites the outer ring of the first radiator 1, the third feed port 8 and the fourth feed port 9 are fed by SMA coaxial lines with a characteristic impedance of 50Ω, and excite the second radiation on the x-axis and y-axi...