Compact Multi-Band Antenna Structure With Via-Coupled Radiation Portions
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Solution Overview
Problem
Existing antennas in mobile devices often have insufficient bandwidth, leading to degraded communication quality.
Innovation Solution
A novel antenna structure comprising a grounding element, radiation portions, and a dielectric substrate with specific configurations to cover multiple frequency bands, including a first radiation portion, a second radiation portion, a shorting radiation portion, a third radiation portion, and conductive via elements, optimized for small size and wide bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional antenna structure is used, then the device size is reduced, but the bandwidth is insufficient
Solution Approach 1:
The antenna is divided into multiple radiation portions (first, second, third radiation portions) with different orientations and functions. Each portion contributes to different frequency bands, allowing the antenna to achieve wide bandwidth coverage while maintaining a compact overall structure that fits within mobile device constraints.
Solution Approach 2:
The antenna structure utilizes three-dimensional space by extending radiation portions in different directions (e.g., first radiation portion in x-direction, second in y-direction, third in z-direction) and employing via holes to connect different layers. This multi-dimensional arrangement enables wide bandwidth operation within a small footprint area.
2Adaptability or versatility
If the antenna bandwidth is increased to cover multiple frequency bands, then communication quality is improved, but the impedance matching becomes more difficult
Solution Approach 1:
Different radiation portions are designed with locally optimized geometries and orientations tailored to specific frequency bands. The first radiation portion is optimized for 2.4-2.5 GHz, the second for 5.15-5.85 GHz, and the third for 5.925-7.125 GHz, allowing each section to achieve optimal impedance matching for its target band while contributing to overall wideband performance.
Solution Approach 2:
The antenna employs asymmetric ground structures and non-uniform radiation element configurations to achieve broad bandwidth coverage. The asymmetric design allows different parts of the antenna to resonate at different frequencies, enabling multi-band operation with proper impedance matching across all bands without requiring symmetric geometric constraints.
Data Source
AI summary
An antenna structure includes a grounding element, a first, a second and a third radiation portion, a shorting radiation portion, a grounding radiation portion, a dielectric substrate, and a first conductive via element. The first radiation portion and the second radiation portion are coupled to a feeding point. The second radiation portion is coupled to the grounding element through the shorting radiation element. The third radiation portion is coupled to the grounding element. A first coupling gap is formed between the grounding radiation element and the grounding element. The dielectric substrate has a first surface and a second surface which are opposite to each other. The first radiation portion is disposed on the first surface. The third radiation portion is disposed on the second surface. The third radiation portion is coupled to the first radiation portion through the first conductive via element.