5G MIMO Antenna With Inverted-U and Monopole Branches
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Solution Overview
Problem
Designing small-sized, broadband 5G MIMO antenna systems for handheld devices that can cover the entire 3.3-4.2 GHz frequency band with good isolation, as existing designs typically cover only one or two frequency bands and face challenges in reducing isolation between antennas.
Innovation Solution
A 5G MIMO antenna system comprising four antenna units with an inverted-U structure and a monopole antenna branch, where the first branch is grounded and the second branch serves as both a feed and resonance generator, allowing for adjustments to cover the whole frequency band N77 with improved isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple isolation methods (isolation strips, slots, isolation networks, neutralization lines) are added between antennas, then isolation between antennas is improved, but device complexity and debugging difficulty increase
Solution Approach 1:
The patent extracts and eliminates the need for complex isolation structures by using a simplified antenna unit design with inverted-U and monopole branches. The isolation between antenna units is achieved through the inherent structure and spacing rather than adding isolation strips, slots, or networks, thereby reducing device complexity while maintaining good isolation performance
Solution Approach 2:
The antenna units are designed to self-isolate through their structural configuration. The inverted-U branch and monopole branch arrangement creates natural isolation between adjacent antenna units without requiring additional isolation components, allowing the system to achieve its own isolation requirements
2Volume of moving object
If antenna size is reduced to fit handheld devices, then space utilization is improved, but bandwidth coverage and isolation performance deteriorate
Solution Approach 1:
The patent segments each antenna into two functional branches: an inverted-U branch and a monopole branch. This segmentation allows compact positioning within limited space while maintaining resonance characteristics that enable broadband coverage across the 3.3-4.2 GHz frequency band
Solution Approach 2:
The inverted-U structure utilizes three-dimensional space efficiently by bending the antenna elements in multiple directions rather than extending linearly. This dimensional transformation allows the compact antenna to achieve the electrical length required for broadband operation without increasing its physical footprint
3Ease of manufacture
If existing MIMO antenna designs are used, then implementation is simplified, but frequency band coverage is limited to one or two bands
Solution Approach 1:
The patent designs a universal antenna unit that can cover the entire 3.3-4.2 GHz frequency band (including N77, N78, and N79 bands) with a single configuration. The inverted-U and monopole branch structure provides multi-functional resonance capabilities, eliminating the need for separate antenna designs for different frequency bands while maintaining ease of manufacture
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
The antenna system achieves good isolation and covers the entire 3.3-4.2 GHz frequency band with two resonances, maintaining high radiation efficiency and channel capacity, while being compact enough for handheld devices.
Implementation Method 1
The first branch generates one resonance of the antenna unit
Implementation Method 2
the second branch is also used to generate one resonance of the antenna unit
Data Source
AI summary
A 5G MIMO antenna system includes at least four antenna units which are arrayed at intervals. Each antenna unit includes a first branch and a second branch, wherein the first branch is of an inverted-U structure, and two ends of an opening of the first branch are grounded; the second branch is located in an area defined by the first branch and is a monopole branch, and a feed point is arranged at an end, close to the opening of the first branch, of the second branch. The first branches and the second branches generate two different resonances, so that the 5G antenna system has a broadband operation. Meanwhile, the 5G MIMO antenna system has the characteristics of being small in size, good in isolation and broad in frequency band.