3D Vertically Polarized MIMO Antenna Layout for Low-Band Isolation
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Solution Overview
Problem
Conventional MIMO antenna designs fail to simultaneously optimize performance indicators and MIMO performance in limited spatial layouts, particularly for low-frequency bands like LTE B13, leading to inadequate signal-to-noise ratios and throughput, especially in small form factor devices like 5-inch mobile phones.
Innovation Solution
A MIMO antenna configuration where the diversity antenna's radiation end is disposed perpendicular to the primary antenna's, allowing for flexible and diverse layout options, including geometric shapes like rectangles, triangles, and polygons, with parasitic coupling units to enhance bandwidth through near-field electromagnetic wave coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional planar antenna forms (PIFA, IFA, monopole) are used with traditional up-down or left-right distribution, then antenna structure is simple and easy to manufacture, but MIMO performance and system channel capacity cannot be simultaneously optimized in limited spatial layout
Solution Approach 1:
The patent applies dimensionality change by transitioning from traditional planar (2D) antenna layouts to a three-dimensional spatial configuration. The first and second antennas are arranged in different spatial planes with specific orientation relationships, creating a 3D antenna system that overcomes the limitations of conventional 2D distributions. This spatial dimensionality enhancement allows simultaneous optimization of MIMO performance and system channel capacity within limited device form factors.
Solution Approach 2:
The patent employs asymmetric arrangement of antenna elements, where the first and second antennas have different orientations and spatial positions rather than symmetric distribution. The antennas are configured with specific directional relationships (perpendicular or parallel orientations in different planes), creating an asymmetric spatial layout that improves MIMO performance by reducing correlation between antenna channels while maintaining manufacturing feasibility.
2Volume of moving object
If antennas are placed closer together to reduce device size, then device form factor is reduced, but signal-to-noise ratio and throughput performance deteriorate, especially for low frequency bands like LTE B13
Solution Approach 1:
By utilizing three-dimensional spatial arrangement, the patent achieves effective antenna separation in multiple dimensions while maintaining compact device form factor. The antennas are positioned in different spatial planes with optimized orientations, creating sufficient electromagnetic isolation without increasing the device's footprint or volume. This 3D configuration enables small device size while maintaining adequate signal-to-noise ratio for low frequency bands.
Solution Approach 2:
The patent applies local quality optimization by configuring each antenna with specific orientation characteristics and spatial positioning tailored to its function. The first and second antennas have different local spatial qualities (orientations and positions) that are optimized for their respective roles in the MIMO system, enabling effective performance in compact configurations through localized spatial optimization rather than uniform distribution.
3Device complexity
If traditional antenna distributions are used, then layout is simple, but envelope correlated coefficient cannot be reduced and antenna isolation is insufficient
Solution Approach 1:
The patent reduces envelope correlated coefficient and improves antenna isolation by transitioning to three-dimensional spatial arrangement. The first and second antennas are positioned in different spatial planes with specific orientations (perpendicular or parallel configurations), creating sufficient electromagnetic isolation in multiple dimensions. This 3D layout achieves better antenna independence while maintaining reasonable layout complexity through systematic spatial configuration.
Solution Approach 2:
The asymmetric spatial configuration of the two antennas, with different orientations and positions in three-dimensional space, creates unequal electromagnetic coupling paths between them. This asymmetry reduces the envelope correlated coefficient by minimizing correlation between antenna channels, thereby improving MIMO performance while maintaining manageable layout complexity through deliberate asymmetric design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves MIMO performance, reduces the envelope correlated coefficient, and enhances isolation, achieving better antenna efficiency and satisfying stringent industry requirements for signal-to-noise ratios across a full angle without increasing frequency spectrum resources or antenna transmission power.
Implementation Method 1
parasitic coupling units to enhance bandwidth through near-field electromagnetic wave coupling
Data Source
Figure 1(a)~3(b)
Figure 4(a)~6(b)
Figure 7(a)~9(b)
AI summary
Provided are a vertically polarized MIMO antenna and a terminal having an MIMO antenna. The antenna includes a primary antenna and a diversity antenna, where a radiation end of the diversity antenna is disposed vertically to a radiation end of the primary antenna. The terminal includes the above-mentioned antenna. A combination form of the MIMO antenna in the present disclosure is not limited to a position of antenna feed, so that the size of the terminal is not limited to a spacing of the antennas, and antenna feed points do not need to be designed symmetrically or diagonally. Therefore, flexible and diverse characteristics of the layout of the current terminal are satisfied, the efficiency of the antenna is maximally improved, the ECC is reduced, the isolation degree is improved, and meanwhile, the MIMO performance of the antenna is improved.