Foldable Antenna Coupling Layout for Low-Band Folded Efficiency
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Solution Overview
Problem
Foldable electronic devices experience a significant drop in antenna efficiency due to high-loss materials in the gap between foldable bodies, leading to poor antenna performance in the folded state.
Innovation Solution
Implement a foldable electronic device with a main antenna element and a parasitic antenna element that perform current loop radiation, utilizing magnetic field coupling to excite currents in the same direction on overlapping grounding plates, thereby suppressing gap mode excitation and enhancing longitudinal mode excitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antenna is used in a foldable electronic device, then the antenna can operate in both folded and unfolded states, but the antenna efficiency drops significantly (2 dB to 4 dB) in the folded state due to high-loss materials in the gap
Solution Approach 1:
The antenna system is divided into two separate antenna elements: a first antenna element disposed on the first foldable body and a second antenna element disposed on the second foldable body. This segmentation allows each element to be optimized for its specific location and reduces the impact of gap losses on overall antenna performance.
Solution Approach 2:
A coupling mechanism is introduced between the first and second antenna elements to enable magnetic field coupling. This intermediary coupling allows the antenna system to maintain efficient operation in the folded state by transferring energy between the two elements through magnetic coupling rather than direct electrical connection through the lossy gap.
2Volume of moving object
If the electronic device is folded to achieve portability, then the device becomes more compact and portable, but the antenna efficiency decreases due to the presence of high-loss materials in the gap between foldable bodies
Solution Approach 1:
The antenna system is segmented into two separate elements located on different foldable bodies, allowing the device to maintain compact folded form factor while preserving antenna functionality through distributed antenna elements that do not rely on continuous current paths through the gap.
Solution Approach 2:
Magnetic field coupling serves as an intermediary mechanism that enables energy transfer between the two antenna elements without requiring direct electrical connection through the high-loss gap materials, thus maintaining efficiency in the compact folded state.
3Volume of moving object
If the gap between foldable bodies is reduced to improve folding compactness, then the device becomes more portable, but the impact of high-loss materials on antenna performance increases
Solution Approach 1:
By segmenting the antenna system into two separate elements on different foldable bodies, the design eliminates the need for continuous current paths through the gap, making antenna performance less sensitive to gap size and the associated high-loss materials.
Solution Approach 2:
Magnetic field coupling acts as an intermediary that enables effective antenna operation independent of the physical gap size between foldable bodies, allowing compact folding without compromising antenna reliability.
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 approach increases antenna efficiency in the folded state by reducing energy consumption and improving performance, effectively addressing the issue of poor efficiency in low bands.
Implementation Method 1
The first radiating branch is configured to perform magnetic field coupling with the second radiating branch, to form current loop radiation on both the first radiating branch and the second radiating branch
Implementation Method 2
The main antenna element is an antenna structure having a radiation characteristic of a current loop antenna
Data Source
AI summary
This application provides a foldable electronic device and an antenna system for same. The antenna system includes a main antenna element and a parasitic antenna element. The main antenna element includes a feed point and a first radiating branch disposed on a first body of the electronic device. The parasitic antenna element includes a second radiating branch disposed on a second body of the electronic device. In a folded state, the first radiating branch and the second radiating branch are at least partially overlapped. The first radiating branch is configured to perform magnetic field coupling with the second radiating branch, to form current loop radiation on both the first radiating branch and the second radiating branch, and a current direction in a current loop formed on the first radiating branch is the same as a current direction in a current loop formed on the second radiating branch.