Multi-element Antenna for Omnidirectional Wi-Fi Coverage
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Solution Overview
Problem
Designing an almost omnidirectional antenna structure that effectively covers multiple frequency bands while maintaining communication quality is a challenge, especially for mobile devices that require wide coverage and efficient signal transmission and reception.
Innovation Solution
The proposed antenna structure includes a dielectric substrate with strategically positioned radiation elements of varying shapes and feeding points, coupled with a switch circuit to optimize signal distribution across frequency bands from 2400 MHz to 7125 MHz, ensuring wideband operations and high radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a traditional antenna structure is used, then the device complexity is low, but the radiation coverage is narrow and communication quality deteriorates
Solution Approach 1:
The antenna structure is divided into multiple independent radiation elements (first through seventh radiation elements) with different geometries and feeding points. Each element contributes to different aspects of the omnidirectional radiation pattern, allowing the system to achieve wide coverage by combining multiple segmented components rather than using a single complex element
Solution Approach 2:
The patent transitions from planar antenna elements to a three-dimensional configuration by positioning radiation elements on both the first surface and second surface of the dielectric substrate. This vertical dimensionality addition enables omnidirectional radiation in the horizontal plane while maintaining structural compactness, resolving the contradiction between coverage area and structural complexity
2Loss of energy
If multiple radiation elements are added to achieve omnidirectional radiation, then the radiation efficiency improves, but the device complexity increases
Solution Approach 1:
Multiple radiation elements with different orientations and feeding points are merged into a single integrated antenna structure mounted on one dielectric substrate. The elements work cooperatively to produce omnidirectional radiation patterns, achieving high radiation efficiency through constructive combination rather than requiring separate antenna systems
Solution Approach 2:
The antenna structure is designed to operate across multiple frequency bands (2.4 GHz, 5 GHz, and 6 GHz Wi-Fi bands) simultaneously using the same set of radiation elements. The multi-functional design achieves high radiation efficiency for various wireless standards without proportionally increasing complexity, as the same structural components serve multiple communication functions
3Adaptability or versatility
If the antenna structure is optimized for wideband operations, then the adaptability improves, but the manufacturing precision requirements increase
Solution Approach 1:
Different radiation elements are designed with specific local geometries and positioning optimized for their particular function within the omnidirectional system. Each element has tailored dimensions and placement (e.g., elements on the first surface versus second surface) that simplify its individual fabrication while contributing to the overall wideband performance, reducing the need for ultra-precise manufacturing across the entire structure
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 structure achieves almost omnidirectional radiation patterns, significantly improving communication quality and supporting wideband operations for mobile devices, including conventional WLAN and next-generation Wi-Fi 6E, with radiation efficiency exceeding 34% across the covered frequency bands.
Implementation Method 1
a first radiation element (130), a second radiation element (140), a third radiation element (150), a fourth radiation element (160), a fifth radiation element (210), a sixth radiation element (220), and a seventh radiation element (230
Data Source
AI summary
An antenna structure includes a ground element, a dielectric substrate, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, a fifth radiation element, a sixth radiation element, and a seventh radiation element. The dielectric substrate has a first surface and a second surface. The first radiation element and the third radiation element are coupled to a first feeding point. The second radiation element and the fourth radiation element are coupled to the ground element. The first radiation element, the second radiation element, the third radiation element, and the fourth radiation element are on the first surface. The fifth radiation element is coupled to a second feeding point. The sixth radiation element and the seventh radiation element are coupled to the fifth radiation element. The fifth radiation element, the sixth radiation element, and the seventh radiation element are on the second surface.