Nested Multi-Element Antenna Layout for Wideband MIMO Coverage
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Solution Overview
Problem
Existing antennas often have insufficient bandwidth, which negatively affects communication quality in mobile devices, particularly in devices requiring wideband operations across multiple frequency bands.
Innovation Solution
A novel antenna system design comprising multiple radiation elements and a ground element, optimized with specific coupling gaps and shapes, allowing for wideband operation across frequency bands from 617 MHz to 5925 MHz, including LTE frequencies, and supporting MIMO functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional antenna design is used, then the antenna can be simple in structure, but the bandwidth is insufficient and cannot cover multiple frequency bands
Solution Approach 1:
The antenna structure is divided into multiple independent radiation elements (first radiation element, second radiation element, third radiation element) with different geometric shapes. Each element is designed to resonate at specific frequency bands, allowing the composite antenna to cover a wide bandwidth from 617 MHz to 5925 MHz by combining the radiation patterns of all elements.
Solution Approach 2:
The second radiation element and third radiation element are disposed inside the region defined by the first ground element and first radiation element. This nested arrangement allows multiple radiation elements to be integrated in a compact space, achieving wideband coverage without significantly increasing the overall antenna footprint.
2Volume of moving object
If the antenna size is reduced for mobile devices, then the device becomes more compact, but the bandwidth and radiation efficiency deteriorate
Solution Approach 1:
Multiple radiation elements are nested within the compact antenna structure, with the second and third radiation elements positioned inside the region defined by the first ground element and first radiation element. This allows wideband coverage to be achieved in a small form factor suitable for mobile devices.
Solution Approach 2:
The antenna utilizes three-dimensional spatial arrangement of multiple radiation elements with different orientations and shapes. By exploiting the third dimension and spatial distribution, the antenna achieves wideband performance without increasing the planar footprint, making it suitable for compact mobile devices.
3Adaptability or versatility
If multiple frequency bands are covered, then communication versatility is improved, but the antenna structure becomes more complex
Solution Approach 1:
The antenna covers multiple frequency bands by segmenting the radiation function across four distinct radiation elements, each optimized for specific bands. This segmentation allows versatile frequency coverage while keeping each individual element relatively simple in structure.
Solution Approach 2:
The antenna structure is designed with multi-functionality, where the same antenna system can operate across multiple frequency bands (617 MHz to 5925 MHz) and support various communication standards including LTE. The multiple radiation elements work together to provide universal coverage without requiring separate antennas for different bands.
4Volume of moving object
If the radiation elements are placed closer to reduce size, then the antenna becomes more compact, but the isolation between elements deteriorates
Solution Approach 1:
The radiation elements are arranged in an asymmetric configuration rather than uniform spacing. The second radiation element is adjacent to the first radiation element, while the third radiation element is adjacent to the first ground element, with specific coupling gaps. This asymmetric arrangement optimizes the isolation between elements while maintaining a compact overall size.
Solution Approach 2:
Different coupling gaps are introduced between adjacent radiation elements to optimize local isolation characteristics. The specific positioning of the second and third radiation elements within the region defined by the first ground element and first radiation element creates favorable local electromagnetic environments that maintain isolation even in a compact configuration.
Data Source
AI summary
An antenna system includes a first antenna structure which includes a first ground element, a first radiation element, a second radiation element, and a third radiation element. The first radiation element is coupled to the first ground element. A region is defined by the first ground element and the first radiation element. The second radiation element has a first feeding point. The second radiation element is adjacent to the first radiation element. The third radiation element is coupled to the first feeding point. The third radiation element is adjacent to the first ground element. The second radiation element and the third radiation element are disposed inside the aforementioned region.