Compact Multi-Element Antenna Layout for Wideband Mobile Coverage
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Solution Overview
Problem
Designing a small-size, wideband antenna element that can effectively cover multiple frequency bands for mobile devices is a critical challenge due to the limitations of existing antennas in maintaining communication quality across varying frequency ranges.
Innovation Solution
The proposed antenna structure includes a ground element, multiple radiation elements of specific shapes (inverted U, straight, T, and rectangular) disposed on a dielectric substrate, with strategic coupling gaps and dimensions optimized to cover low-frequency and high-frequency bands, including those for WLAN and Wi-Fi 6E, achieving wideband operations.
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 it cannot cover multiple frequency bands with sufficient bandwidth
Solution Approach 1:
The antenna structure is divided into multiple independent radiation elements (first radiation element with inverted U-shape, second radiation element with straight-line shape, third radiation element with T-shape, fourth radiation element with inverted T-shape, and fifth radiation element with rectangular shape). Each element is optimized for specific frequency bands, allowing the antenna to cover low-frequency band (700-900 MHz), first high-frequency band (2.3-2.7 GHz), second high-frequency band (3.5-3.8 GHz), and third high-frequency band (5.15-5.85 GHz) simultaneously while maintaining a compact overall structure.
Solution Approach 2:
The antenna structure achieves multi-functionality by integrating multiple radiation elements that can operate across different frequency bands. The ground element, first radiation element, second radiation element, third radiation element, and additional elements work together to provide universal coverage for mobile communication (2G, 3G, 4G) and wireless local area network (Wi-Fi 6E) applications, allowing a single antenna structure to replace multiple separate antennas.
2Volume of moving object
If the antenna size is reduced, then the device can be more compact, but the bandwidth and radiation efficiency deteriorate
Solution Approach 1:
The antenna structure utilizes three-dimensional space effectively by positioning radiation elements on both the first surface and second surface of the dielectric substrate. The first radiation element extends across both surfaces, while the second, third, fourth, and fifth radiation elements are arranged in different spatial positions and orientations. This spatial distribution allows the antenna to achieve wide bandwidth and high radiation efficiency within a compact footprint, overcoming the limitation that smaller antennas typically have narrower bandwidths.
3Adaptability or versatility
If multiple radiation elements are added to cover more frequency bands, then the frequency coverage is improved, but the manufacturing complexity increases
Solution Approach 1:
The antenna structure merges multiple radiation elements (first, second, third, fourth, and fifth radiation elements) and the ground element onto a single dielectric substrate. All elements are fabricated using standard printed circuit board (PCB) techniques, with conductive patterns formed through copper traces and vias. This integrated design allows the complex multi-band antenna to be manufactured using conventional PCB manufacturing processes, avoiding the need for complex assembly of separate antenna components and thereby simplifying production despite the multiple radiating elements.
Data Source
AI summary
An antenna structure includes a ground element, a first radiation element, a second radiation element, a third radiation element, and a dielectric substrate. The first radiation element has a feeding point. The first radiation element is coupled to a first grounding point on the ground element. The second radiation element is coupled to the feeding point. The third radiation element is coupled to a second grounding point on the ground element. The third radiation element is adjacent to the second radiation element. The ground element, the first radiation element, the second radiation element, and the third radiation element are all disposed on the dielectric substrate.