Foldable Screen Antenna Layout for High-Isolation Overlap
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The design of antennas in foldable electronic devices, such as smartphones with foldable screens, faces challenges in achieving high isolation and efficient space utilization due to overlapping antenna structures in different device configurations.
Innovation Solution
The implementation of complementary antenna designs, including strip-shaped conductors and feed points, with specific overlap and alignment configurations, to achieve orthogonal polarization directions and high isolation performance, particularly for MIMO antenna systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antennas are placed at overlapping positions in foldable devices, then space utilization is improved, but isolation between antennas deteriorates
Solution Approach 1:
The patent applies local quality by configuring different antenna structures at overlapping positions: one antenna uses a strip-shaped conductor while the other uses a slot structure. These locally differentiated structures enable orthogonal polarization directions, achieving high isolation (greater than 20 dB) while maintaining overlapping spatial arrangement for efficient space utilization in foldable devices
Solution Approach 2:
The patent resolves the isolation problem by transitioning from spatial separation to polarization dimension differentiation. By designing antennas with orthogonal polarization directions (one horizontal, one vertical) at overlapping positions, the system achieves high isolation without requiring physical separation, thus maintaining compact form factor while solving the isolation challenge
2Volume of moving object
If antenna structures are simplified for compact design, then device compactness is improved, but antenna performance deteriorates
Solution Approach 1:
The patent employs parameter changes by optimizing the geometric dimensions of antenna structures, specifically setting the width of strip-shaped conductors and slots to between 0.05λ and 0.15λ (where λ is the operating wavelength). This parameter optimization enables compact antenna structures that maintain high radiation efficiency and impedance matching, achieving both compactness and performance in foldable devices
Data Source
AI summary
A foldable electronic device having a primary screen portion with a primary-screen antenna, and a secondary screen portion with a secondary-screen antenna. Positions of the primary-screen antenna and the secondary-screen antenna overlap when the electronic device is folded. The primary-screen antenna and the secondary-screen antenna may excite two antenna patterns of high isolation. In this way, even if the primary-screen antenna and the secondary-screen antenna operate on a same frequency band and overlap, good isolation performance can also be obtained.