Antenna Cavity Extension for Foldable Device Volume Constraints
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Solution Overview
Problem
The increasing number of antennas in small mobile devices, combined with reduced available volume and the need for antennas to function in both 'fold' and 'open' states of foldable devices, poses challenges to achieving sufficient antenna performance and coverage.
Innovation Solution
The design of an antenna cavity with a perpendicular cavity extension, which can be open or closed, allows for increased usable antenna volume and improved performance by guiding electromagnetic fields, and can be integrated into foldable devices to maintain performance in both states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display size is extended to cover the whole front face of the device, then the display area is increased, but the usable antenna volume is decreased
Solution Approach 1:
The patent extends the antenna cavity in a direction perpendicular to the display surface, utilizing the third dimension (depth/thickness) of the device to increase antenna volume without compromising display area. The cavity extension protrudes from the front face of the device, effectively using the Z-axis dimension to resolve the contradiction between display area and antenna volume.
2Adaptability or versatility
If the device uses a foldable display mechanism, then the device flexibility is improved, but the antenna design freedom is limited due to the need to maintain performance in both folded and open states
Solution Approach 1:
The patent employs a movable cavity extension that can be positioned in different locations along the foldable device's body. This dynamic positioning capability allows the antenna cavity to adapt to different device states (folded or open), maintaining antenna performance flexibility while supporting the foldable display mechanism's adaptability.
3Adaptability or versatility
If multiple antennas are placed in a small mobile device, then the frequency band coverage is increased, but the antenna efficiency is decreased due to limited space
Solution Approach 1:
By extending the antenna cavity perpendicular to the display surface and utilizing the device's thickness dimension, the patent creates additional space for antenna elements. This vertical expansion allows multiple antennas to be accommodated with sufficient separation, maintaining their efficiency while achieving broader frequency band coverage.
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 enhances antenna performance and volume utilization in foldable devices, maintaining performance regardless of the device's state and avoiding coupling issues when folded.
Implementation Method 1
the cavity extension may be open at an end of the cavity extension. This solution enables using the cavity extension as a guiding mechanism for an electromagnetic field excited by an antenna feed of the device
Implementation Method 2
a cavity extension extending at a direction substantially perpendicular to the first side of the antenna cavity and aligned with the gap
Implementation Method 3
a resonant frequency of the cavity antenna may be tuned with a size of the cavity extension
Data Source
AI summary
A device for radio frequency communications includes an antenna cavity enclosed by at least four conductor walls, a gap between two perpendicular conductor walls at a first side of the antenna cavity, and a cavity extension extending at a direction perpendicular to the first side of the antenna cavity and aligned with the gap. The cavity extension extends from a second side of the antenna cavity opposite to the first side of the antenna cavity, and the cavity extension is closed at an end of the cavity extensions.