Handheld Device Metal Frame Antenna Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The communication quality of handheld devices deteriorates due to human body contact, specifically the 'death grip' effect caused by finger contact with metal frame slits, leading to severe frequency deviation and signal quality loss.
Innovation Solution
A handheld device design featuring a metal frame with slits bridged by switches and sensors that detect finger contact, allowing the switches to switch states and maintain antenna connectivity, ensuring one slit is always disconnected to prevent frequency deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slits are disposed on the metal frame to form an antenna, then antenna performance is improved, but communication quality deteriorates when user's finger touches the slit
Solution Approach 1:
The patent applies dynamics by making the switch states changeable based on detected finger contact. The switches are configured to be switchable between connected and disconnected states, allowing the antenna structure to dynamically adapt when a user's finger touches the slit, thereby preventing frequency deviation and maintaining communication quality.
Solution Approach 2:
The patent implements feedback by using sensors to detect whether a user's finger connects the slit and then switching the switch states accordingly. The detection unit detects finger contact, and based on this detection, the switches are controlled to maintain proper antenna function, creating a closed-loop feedback system that prevents the death grip effect.
2Object-affected harmful factors
If switches are added to bridge slit sides to prevent death grip, then communication quality improves, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by altering the electrical connection state of the switches based on detected conditions. The switches change their connection parameters (connected or disconnected) in response to finger contact detection, allowing the system to maintain optimal antenna performance without permanent structural modifications.
Solution Approach 2:
The patent implements self-service by enabling the antenna system to automatically detect and respond to finger contact without external intervention. The detection unit and switches work together to automatically adjust the antenna configuration when needed, eliminating the requirement for manual adjustment or complex external control mechanisms.
Data Source
Figure 1~2
Figure 3a~3b
Figure 4~5
AI summary
The present invention relates to a handheld device, including a metal frame, two switches, and an antenna feedpoint, where two slits are disposed at a bottom of the metal frame, or a slit is disposed on either side of the metal frame; the slits divide the metal frame into a left frame, a middle frame, and a right frame; two sides of each slit are bridged by one switch, where one of the switches is in a connected state, the other of the switches is in a disconnected state, and the two switches perform state switching when a user's finger connects a slit corresponding to the switch in a disconnected state; and the antenna feedpoint is electrically connected to the middle frame, and the left frame and the right frame are grounded, to form an antenna. When the user's finger connects the slit corresponding to the switch in a disconnected state, the two switches perform state switching to avoid a "death grip", so that the built-in antenna has one slit in a disconnected state in real time, thereby improving communication quality of the handheld communications device.