A broadband MIMO differential filter slot antenna

Abstract

The invention discloses a broadband MIMO differential filter slot antenna comprising an antenna board and four differential filter slot antenna units; the four differential filter slot antenna units are symmetric about a center point of the antenna board, and each two adjacent differential filter slot antenna units are perpendicular to each other; the antenna board comprises a dielectric substrate, an upper metal layer and a lower metal layer; each differential filter slot antenna unit comprises a slot radiator, a dual mode resonator and two microstrip feeders; the dual mode resonator comprises a closed loop microstrip line and two short-circuit stubs; and each of the short-circuit stubs is provided with a metal through-hole. The antenna of the invention has a steep skirt band and overallefficiency of in-band flatness, maintains good stability and low cross polarization at different frequencies, and has strong suppression of common mode signals. Meanwhile, high isolation is realized without adoption of a decoupling network, so that the filter antenna is miniaturized.

Description

technical field [0001] The invention relates to the field of antennas, in particular to a broadband MIMO differential filter slot antenna. Background technique [0002] Noise effects play a critical role in the performance of most radio frequency and microwave communication systems. The balanced circuit widely used at present can suppress the common mode noise very well. However, it is necessary to use a balun to connect the antenna and the balanced circuit, which occupies a large volume and consumes a lot of energy, which is not conducive to integration and miniaturization. [0003] On the other hand, with the rapid development of wireless communication technology, the problem of limited channel capacity has received more attention. However, new problems such as multipath fading and poor system stability will appear again. MIMO antennas can suppress channel fading by increasing the number of antennas. At present, the research on MIMO antennas is relatively mature, but mo...

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Problems solved by technology

[0004] The filter at the front end of the antenna plays the role of filtering clutter and improving the selectivity of the passband edge, but the connection between the filter and the MIMO antenna occupies a large volume in the system, which cannot meet the requirements of modern communication systems. The filter antenna can realize filtering and radiation functions, and the integrated design of filters and MIMO antennas can save system size and reduce losses

However, due to the mutual influence between adjacent elements of the MIMO antenna, it is still a difficult point to use the filter design method to integrate the design of the MIMO filter antenna.

At present, there are relatively few studies on MIMO filter antennas, especially differential MIMO filter antennas.

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