Multi-Frequency Antenna Using Nested U-Shaped Radiators
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Solution Overview
Problem
Existing multi-frequency antennas for wireless local area networks are limited in size due to the ¼ wavelength requirement, making them inadequate for miniaturization and unable to effectively operate across different frequency bands like 2.4 GHz and 5 GHz without compromising performance.
Innovation Solution
A multi-frequency antenna design featuring a feeding element, first and second U-shaped radiators, a grounding element, and a coupling element, where the U-shaped radiators form gaps to optimize size reduction while maintaining performance across IEEE 802.11a and IEEE 802.11b standards, utilizing specific metal bar configurations to achieve wider bandwidth and improved radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna conducting path is designed to be longer than or approximate to 1/4 wavelength of the radiating wave, then the radiation performance is improved, but the antenna occupies more planar space and cannot be reduced in size
Solution Approach 1:
The patent transitions from a planar two-dimensional layout to a three-dimensional folded structure. The radiating element is folded back on itself multiple times, utilizing vertical and lateral dimensions to achieve a longer effective conducting path within a compact footprint. This dimensional transformation allows the antenna to maintain 1/4 wavelength radiation performance while occupying significantly less planar space.
Solution Approach 2:
The radiating element is designed with a nested folded configuration where portions of the antenna structure are folded back and nested within the overall form factor. This nesting approach allows the long conducting path to be compacted into a smaller envelope, achieving both long electrical length and small physical size simultaneously.
2Adaptability or versatility
If a single antenna is designed to operate for multi-frequency bands, then the convenience for users to access different WLAN systems is improved, but the antenna structure becomes more complex
Solution Approach 1:
The patent designs a single radiating element structure that can operate across multiple frequency bands (2.4 GHz and 5 GHz WLAN standards). By carefully controlling the dimensions, folding patterns, and gap configurations of the radiating element, the antenna achieves multi-frequency functionality without requiring separate antenna elements for each band, thus maintaining structural simplicity while enhancing versatility.
Solution Approach 2:
Different portions of the folded radiating element are designed with specific local characteristics (different segment lengths, gap positions, and folding angles) that resonate at different frequencies. This local differentiation allows the single structure to support multiple frequency operations, with each segment contributing to specific frequency band performance.
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 design achieves wider bandwidth, higher radiation efficiency, and increased average gain compared to traditional antennas, supporting miniaturization and improved performance across multiple wireless LAN standards.
Implementation Method 1
The interconnecting element 12 has a connecting terminal 20 coupled to a feeding wire 18, for feeding signals into the planar radiating element 14. The planar radiating element 14 and the planar grounding element 16 generate electromagnetic waves
Data Source
AI summary
A multi-frequency antenna includes a feeding element, a first U-shaped radiator, a second U-shaped radiator, a grounding element and a coupling element. The first U-shaped radiator is coupled to the feeding element and forms a first gap toward the feeding element. The second U-shaped radiator is coupled to the feeding element and forms a second gap toward the first U-shaped radiator. The grounding element is coupled to a ground end. The coupling element is coupled between the feeding element and the grounding element.