Dual-Loop Antenna Structure for Compact Mobile Devices
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Solution Overview
Problem
Designing a small-size antenna with wideband characteristics for mobile devices is challenging due to limited interior space, as existing antennas struggle to accommodate the required elements for multiple frequency bands efficiently.
Innovation Solution
The proposed antenna structure incorporates two combined loop structures excited at different frequency bands, sharing resonant paths to minimize size while maintaining efficiency, featuring a U-shaped radiation branch and straight-line ground branches, with optional extensions and parasitic branches to enhance bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a conventional antenna design is used, then the antenna can cover required frequency bands, but the antenna size becomes too large for limited mobile device interior space
Solution Approach 1:
The patent combines two loop structures (first and second loop structures) into a single antenna system that shares common elements (first radiation branch, ground element, and feeding mechanism). This merging allows the antenna to support multiple frequency bands (2.4 GHz and 5 GHz Wi-Fi bands) while reducing the overall area occupied compared to separate antennas for each band.
Solution Approach 2:
The antenna structure is designed with dual functionality to operate across two distinct frequency bands (2400-2500 MHz and 5150-5850 MHz) using a single radiating structure. The first and second loop structures enable the same physical antenna to serve multiple communication standards (Wi-Fi 2.4 GHz and 5 GHz), eliminating the need for separate dedicated antennas.
2Area of moving object
If the antenna size is reduced to fit mobile devices, then interior space is saved, but the bandwidth and efficiency of the antenna deteriorate
Solution Approach 1:
The antenna is segmented into distinct functional portions: the first loop structure (comprising first radiation branch, first ground branch, and ground element) optimized for 2.4 GHz operation, and the second loop structure (comprising second radiation branch, second ground branch, and ground element) optimized for 5 GHz operation. This segmentation allows each portion to be tuned for its specific frequency band while sharing common elements, maintaining efficiency in both bands despite the compact overall size.
Solution Approach 2:
Different portions of the antenna structure are optimized for different frequency bands: the first loop structure with its specific configuration is locally optimized for 2.4 GHz Wi-Fi, while the second loop structure is locally optimized for 5 GHz Wi-Fi. The ground element serves both functions, demonstrating local quality optimization where different regions of the structure serve different functional purposes.
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
This design achieves efficient dual-band operation across 2.4 GHz and 5 GHz frequency bands with reduced size, maintaining antenna efficiency and widening bandwidth, making it suitable for small-size mobile communication devices.
Implementation Method 1
the first loop structure is excited to generate a first frequency band, and the second loop structure is excited to generate a second frequency band
Data Source
AI summary
An antenna structure includes a ground element, a first radiation branch, a first ground branch, a second radiation branch, and a second ground branch. A first end of the first radiation branch is coupled to a signal source. A first end of the first ground branch is coupled to the ground element. A second end of the first ground branch is coupled to a second end of the first radiation branch. A first end of the second radiation branch is coupled to the second end of the first radiation branch. A first end of the second ground branch is coupled to the ground element. A second end of the second ground branch is coupled to a second end of the second radiation branch.