A small size and high isolation three-element multiple-input multiple-output antenna based on printed circuit board

Abstract

The invention discloses a small-size high-isolation three-unit MIMO antenna based on a printed circuit board. The antenna comprises a substrate, slot antenna bodies with an open-loop terminal and a micro-strip feed circuit with a micro-strip decoupling structure. The substrate is a double-face printed circuit board with a rotational symmetry structure, the micro-strip feed circuit is etched on the front face of metal of the substrate, the slot antenna bodies are etched on the reverse side of the substrate, the substrate is provided with feed through holes used for feed and short-circuit through holes used for matching, the micro-strip feed circuit is composed of standard micro-strip feeder lines and the corresponding micro-strip decoupling structure, and the micro-strip feeder lines pass through the slot antenna bodies, carry out feed on the slot antenna bodies through coupling and are matched with the short-circuit through holes; the micro-strip decoupling structure is connected with the micro-strip feeder lines to provide a new coupling component for offsetting an original coupling component of the connecting position so as to achieve decoupling. The size of the antenna is reduced, high isolation and directional radiation characteristics are achieved, and the antenna can be applied to small-sized wireless communication equipment with the MIMO technology adopted.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a small-sized high-isolation three-unit multi-input multi-output antenna based on a printed circuit board. Background technique [0002] In recent years, with the development and progress of technology, people have higher and higher requirements for wireless communication speed. As the channel capacity approaches the Shannon limit, it is increasingly difficult to achieve a major breakthrough in the traditional way of increasing the communication rate due to the limited frequency band and power in wireless communication. In this context, emerging airspace resources have become a research hotspot. It is against this background that Multiple Input Multiple Output (Multiple Input Multiple Output, hereinafter referred to as MIMO) technology emerges. MIMO technology refers to the use of multi-unit antennas at the receiving and receiving ends of wireless communication. By removing th...

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Problems solved by technology

However, the working mode of the former antenna is not uniform, and the pattern characteristics and gain characteristics are not ideal, while the structure of the latter is mostly related to the wavelength, so it is difficult to further compress the size

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