Antenna Ground Plane Sensing Capacitor for Mobile Devices
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Solution Overview
Problem
Current mobile communication devices face challenges in miniaturization and increased costs due to the need for a large metal sheet to improve the sensitivity of the sensing capacitor, which also requires distance from the system ground plane and antenna to avoid interference and failure.
Innovation Solution
A mobile communication device design that forms a sensing capacitor using the antenna and system ground plane, with a signal distributor and sensing controller to detect objects and adjust antenna power, eliminating the need for an additional metal sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large metal sheet is used to form the sensing capacitor to improve sensitivity, then the sensing sensitivity is improved, but the device occupies more hardware space and increases manufacturing complexity
Solution Approach 1:
The patent merges the antenna structure with the sensing capacitor structure by making the antenna's radiating element serve as one plate of the sensing capacitor and the system ground plane serve as the other plate. This eliminates the need for a separate large metal sheet while maintaining sensing functionality, thereby reducing hardware space and assembly complexity without sacrificing sensitivity.
2Volume of moving object
If the metal sheet of the sensing capacitor is disposed close to the system ground plane to save space, then the device miniaturization is improved, but the sensing capacitor may fail
Solution Approach 1:
By integrating the antenna radiating element as the sensing capacitor plate, the design naturally optimizes the spacing between capacitor plates. The antenna structure inherently maintains appropriate distance from the ground plane to ensure both sensing reliability and miniaturization, eliminating the need for an additional separate metal sheet that would require careful spacing management.
3Volume of moving object
If the metal sheet of the sensing capacitor is disposed close to the antenna to save space, then the device miniaturization is improved, but the antenna reception quality is degraded
Solution Approach 1:
The patent resolves this contradiction by making the antenna radiating element itself one plate of the sensing capacitor. This integration ensures that the sensing capacitor plates are properly positioned relative to each other and the ground plane, maintaining both antenna reception quality and achieving miniaturization without requiring an additional metal sheet disposed near the antenna.
4Reliability
If an additional metal sheet is added to form the sensing capacitor, then the sensing function is achieved, but the manufacturing cost and assembly time are increased
Solution Approach 1:
The patent eliminates the need for an additional metal sheet by integrating the antenna radiating element as one plate of the sensing capacitor and using the existing system ground plane as the other plate. This reduces the bill of materials and simplifies assembly procedures while maintaining the sensing function, thereby reducing manufacturing cost and assembly time.
5Reliability
If a separate sensing capacitor structure is added to comply with SAR standards, then the SAR compliance is achieved, but the device miniaturization is limited
Solution Approach 1:
The patent achieves SAR compliance by integrating the sensing capacitor function into the existing antenna structure. The radiating element and ground plane form the sensing capacitor that detects proximity to the human body, enabling power adjustment to meet SAR requirements. This integration eliminates the need for separate sensing components, allowing device miniaturization while maintaining SAR compliance.
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
Facilitates miniaturization and reduces manufacturing costs by integrating the sensing capacitor without additional hardware, while maintaining compliance with SAR standards by adjusting antenna power in response to detected objects.
Implementation Method 1
The antenna is configured to convert an electromagnetic wave to a radio-frequency signal
Implementation Method 2
the antenna and the system ground plane are used to form a sensing capacitor to detect an object so as to generate a detecting signal
Data Source
AI summary
A mobile communication device including a system ground plane, an antenna, a signal distributor, a transceiver and a sensing controller is provided. The antenna converts an electromagnetic wave to a radio-frequency signal. Besides, the antenna and the system ground plane form a sensing capacitor to detect an object and generate a detecting signal accordingly. The signal distributor is electrically connected to the antenna through a first connection terminal and a second connection terminal and guides the radio-frequency signal and the detecting signal from the antenna to a third connection terminal and a fourth connection terminal. The transceiver is electrically connected to the third connection terminal and processes the radio-frequency signal. The sensing controller is electrically connected to the fourth connection terminal and determines whether the object exists around the antenna according to the sensing signal.