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Multiple-input multiple-output (MIMO) antenna

A multi-output, multi-input technology, applied in the direction of antenna, antenna coupling, antenna components, etc., can solve the problems of increased cost of MIMO antenna, low isolation of antenna units, easy mutual influence of frequency bands, etc., to reduce the number of filters or combining The use of the device, the high isolation, and the simple design effect

Inactive Publication Date: 2017-07-04
HUAWEI TECH CO LTD
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  • Description
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Problems solved by technology

Therefore, the decoupling network needs to be designed for multiple frequency bands, making the decoupling network very complicated
Moreover, since multiple frequency bands share a feed point, it is easy for the frequency bands to affect each other
In addition, multiple frequency bands share a feed point. In the front end of the RF circuit corresponding to each frequency band, a filter or combiner is required to connect to the feed point of the antenna unit, which increases the cost of the MIMO antenna.
This makes the design of the MIMO antenna very complicated, and the isolation between the antenna elements in the MIMO antenna is low

Method used

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Embodiment Construction

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0043] Some design schemes of existing MIMO antennas are firstly introduced below.

[0044] In the MIMO antenna, since there are multiple antenna elements in a limited space, coupling occurs between the antenna elements. Coupling is mainly divided into three types, such as figure 1 As shown, antenna coupling includes current coupling, free space coupling and surface wave coupling. For the above three types of coupling, decoupling design can be carrie...

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Abstract

The invention discloses a multiple-input multiple-output (MIMO) antenna. The antenna supports operation at M frequency bands; the MIMO antenna comprises a first antenna unit and a second antenna unit, and each of the first antenna unit and the second antenna unit has M feed points separately; the M feed points of the two antenna units are in one-to-one correspondence to the M frequency bands respectively; each feed point is connected with a radio frequency circuit of a corresponding frequency band separately; the MIMO antenna also comprises a decoupling circuit; and the decoupling circuit is connected between the first antenna unit and the second antenna unit and used for lowering coupling, generated between the first antenna unit and the second antenna unit, of the first frequency band in the M frequency bands. The MIMO antenna disclosed by the embodiment of the invention is provided with multiple feed points, so that the frequency bans are independent from each other; in addition, usage of filters or combiners in radio frequency channels can be reduced; the decoupling circuit is set specific to one frequency band, so that simple design and low cost can be realized; and furthermore, the antenna units are relatively high in isolation degree.

Description

technical field [0001] Embodiments of the present invention relate to the field of antennas, and more specifically, to a multiple-input multiple-output MIMO antenna. Background technique [0002] The Single Input Single Output (SISO) antenna has an unbreakable bottleneck in terms of channel capacity—Shannon capacity limitation. Under the condition of unlimited size, the more antennas, the throughput rate will increase exponentially. Thus, a multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) antenna technology has been developed. At present, MIMO antenna technology has become one of the core technologies of wireless communication technology. [0003] But for terminal devices such as smartphones, its size is strictly limited. Concentrating multiple antenna elements in the limited space of the terminal equipment will cause a large coupling with each other, and the performance of the MIMO antenna will also decrease accordingly. How to achieve high isolatio...

Claims

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Application Information

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IPC IPC(8): H01Q1/52H01Q5/335H01Q5/328
CPCH01Q1/523H01Q5/328H01Q5/335
Inventor 张明刘大庆王斌
Owner HUAWEI TECH CO LTD
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