Nested Wideband Antenna Structure for Compact Multi-Band Coverage
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Solution Overview
Problem
Designing a small-size, wideband antenna structure that can effectively cover multiple frequency bands without degrading communication quality is a critical challenge in mobile devices, as existing antennas often have insufficient operational bandwidth.
Innovation Solution
The proposed antenna structure comprises a ground element, L-shaped, meandering, and inverted U-shaped radiation elements, along with a nonconductive support element, where the radiation elements are strategically positioned and coupled to achieve impedance matching across multiple frequency bands, including 800 MHz to 860 MHz, 1710 MHz to 2170 MHz, and 2500 MHz to 2690 MHz, using coupling gaps and terminal widening portions to optimize bandwidth and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional antenna structure is used, then the manufacturing cost is low and结构简单, but the operational bandwidth is insufficient and cannot cover multiple frequency bands
Solution Approach 1:
The patent implements nested radiation elements where the second radiation element is surrounded by the first radiation element, and the third radiation element is surrounded by the second radiation element. This nested configuration allows multiple radiation patterns to coexist in a compact space, enabling wideband operation across multiple frequency bands (700 MHz, 850 MHz, 900 MHz, 1800 MHz, 1900 MHz, 2100 MHz, 2300 MHz, and 2500 MHz) while maintaining a relatively simple overall structure.
2Volume of moving object
If the antenna size is reduced for mobile devices, then the device compactness is improved, but the operational bandwidth and signal coverage are degraded
Solution Approach 1:
The nested configuration of radiation elements allows the antenna to maintain a compact form factor suitable for mobile devices while achieving wideband operation. The surrounding elements create multiple current paths and resonance modes within a small volume, enabling coverage of multiple frequency bands without increasing the overall antenna size.
Solution Approach 2:
The patent transitions from planar radiation elements to three-dimensional nested structures. The radiation elements are arranged in different spatial layers with coupling gaps between them, creating vertical and lateral dimensionality that enhances bandwidth while maintaining a compact footprint suitable for mobile device integration.
3Adaptability or versatility
If multiple frequency bands are covered, then the communication versatility is improved, but the impedance matching becomes more difficult to optimize
Solution Approach 1:
The patent applies different geometric characteristics to different radiation elements to optimize impedance matching for specific frequency ranges. The first radiation element has a meandering shape for lower bands, the second has an inverted U-shape, and the third has a complex multi-segment structure. Each element's local geometry is optimized for its target frequency band, achieving excellent impedance matching across all bands (VSWR < 2:1) without requiring complex overall structure adjustments.
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 nonconductive support element. The first radiation element is coupled to a first grounding point on the ground element. The second radiation element has a feeding point. The second radiation element is adjacent to the first radiation element. 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 first radiation element, the second radiation element, and the third radiation element are disposed on the nonconductive support element. The second radiation element is at least partially surrounded by the first radiation element. The third radiation element is at least partially surrounded by the second radiation element.