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Small-sized wideband high-isolation four-unit MIMO antenna array

A high-isolation, four-element technology, applied in the field of four-element MIMO antenna arrays, can solve the problem of not considering increasing or retaining the impedance bandwidth of antenna array elements, MIMO antenna array technology has not been substantially improved, and regardless of performance independence Controllable problems and other problems, to achieve the effect of small mutual influence, small size and simple structure

Inactive Publication Date: 2011-04-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, in the existing MIMO antenna array design, because the main consideration is how to reduce the mutual coupling between the antenna elements, it does not consider how to increase or retain the original impedance bandwidth of the antenna array elements, let alone the independent controllability of the performance. , which makes the MIMO antenna array technology not substantially improved

Method used

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  • Small-sized wideband high-isolation four-unit MIMO antenna array
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  • Small-sized wideband high-isolation four-unit MIMO antenna array

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Embodiment 1

[0032] like image 3 The structure of the four-element MIMO antenna array shown, it comprises the dielectric substrate (11) that comprises relative permittivity 1-100, thickness 0.2-5mm and the antenna element (15a) of MIMO antenna, antenna element (15b), An antenna unit (15c) and an antenna unit (15d), wherein the back side of the dielectric substrate (11) is (12) and the front side is (13), and the floor (14) is printed on the back side of the dielectric substrate (12); the antenna unit (15a), antenna unit (15b), antenna unit (15c) and antenna unit (15d) are respectively provided with the radiation unit (16a), radiation unit (16b), radiation unit (16c) printed on the medium substrate front (13) ) and radiation unit (16d), and are respectively provided with the radiation unit (17a), the radiation unit (17b), the radiation unit (17c) and the radiation unit (17d) printed on the dielectric substrate backside (12), the radiation unit (16a ) and the radiation unit (17a) have an o...

Embodiment 2

[0037] In order to reduce S21 (S12, S43, S34), the present invention adopts isolation structures (31a) and (31b), such as Figure 5 shown. The isolation structure (31a) consists of a metal strip (32a) and two slits (33a), (33b). The function of the slits (33a), (33b) is to prevent the surface current of the floor (14) from flowing from one feed port to the other, thereby reducing the mutual coupling caused by the floor surface waves. The innovation of the isolation structure (31a) is that the length of the metal strip (32a) is greater than the length of the slits (33a), (33b). It space-isolates the antenna units (15a) and (15b) placed on both sides of it, and the principle and function of the isolation structure (31b) are similar to those of the isolation structure (31a), which can reduce the noise caused by the floor surface wave and space wave at the same time. Mutual coupling. Compare EM simulation curves for frequency response Figure 4 and Image 6 , it can be clearl...

Embodiment 3

[0039] In order to reduce |S 31 |(|S 13 |, |S 42 |, |S 24 |), such as Figure 7 The isolation structure (41) shown is applied. At this point, the design of the controllable, broadband and high-isolation four-element MIMO antenna array involved in the present invention is completed. Because the antenna units (15a) and (15d) are relatively far apart and the mutual coupling between them is small, it is not necessary to consider the mutual influence between them in the present invention. Compare EM simulation curves for frequency response Image 6 and 8 , it is obvious that the effect of the isolation structure (41) is to greatly reduce |S 31 |(|S 13 |, |S 42 |, |S 24|), however its introduction has a significant impact on return loss and |S 21 |(|S 21 |, |S 43 |, |S 34 |) can be ignored.

[0040] Therefore, the four-element MIMO antenna array with small broadband and high isolation in this embodiment includes a double strip mechanism, an impedance matching structur...

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Abstract

The invention provides a small-sized wideband high-isolation four-unit multiple input multiple output (MIMO) antenna array, which greatly improves the impedance matching under the condition of extremely small influence on isolation between antenna units by using a double-band structure and an impedance matching structure, so the MIMO antenna unit remains the original wide impedance bandwidth to the greatest extent, good impedance bandwidth can be obtained by properly adjusting the double-band structure and the impedance matching structure, and the isolation is slightly influenced. Because theimpedance matching structure and the double-band structure bring extra capacitance for the antenna unit which is substantially inductive, the influence of cross coupling on return loss is effectivelyreduced (counteracted). In other words, the design can independently adjust the impedance bandwidth. Therefore, the antenna unit can achieve excellent impedance bandwidth under the condition of smallsize, so the antenna unit becomes the best choice of an MIMO antenna array element.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a four-unit MIMO antenna array with small broadband and high isolation. Background technique [0002] The main problem that wireless communication faces at present is how to provide higher data transmission rate. A traditional wireless communication system is a communication system using one transmitting antenna and one receiving antenna, which is a so-called single-input single-output (SISIO) antenna system. The SISO antenna system has an unbreakable bottleneck in communication in terms of channel capacity—Shannon capacity limitation. No matter what modulation technology, coding strategy or other methods are used, the wireless channel always sets a practical physical limit for wireless communication engineering. . Under the condition of not increasing the spectrum bandwidth and transmitting power, the use of multi-antenna diversity technology can improve the signal-to-noise r...

Claims

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Application Information

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IPC IPC(8): H01Q1/38H01Q1/48H01Q1/52H01Q21/00
Inventor 褚庆昕李健凤
Owner SOUTH CHINA UNIV OF TECH
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