Antenna Grounding Through Sensor Module for Compact Wireless Devices
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Solution Overview
Problem
It is challenging to design small form factor electronic devices with wireless communications capabilities that incorporate sensors while maintaining satisfactory wireless performance, as sensors can interfere with antenna functionality.
Innovation Solution
The electronic device incorporates a housing with peripheral conductive structures that form an antenna resonating element, where a sensor module overlaps a slot in the housing, and flexible printed circuits with conductive springs provide multiple ground paths to couple the tuner close to the antenna, maximizing performance despite the presence of sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensors are added to the electronic device to gather sensor data, then the device functionality is improved, but the wireless performance of the antenna deteriorates due to interference from the sensors
Solution Approach 1:
The housing is segmented to create a slot that separates the antenna resonating element from the sensor module, allowing both components to coexist without interference while maintaining device functionality
Solution Approach 2:
A conductive interconnect structure is introduced as an intermediary between the tuner and ground structures, providing a dedicated grounding path that isolates the antenna from sensor interference while maintaining wireless performance
2Volume of moving object
If the antenna structure is made compact to reduce device size, then the form factor is improved, but the antenna performance deteriorates due to limited space for proper grounding and resonating elements
Solution Approach 1:
The antenna resonating element is formed using the housing structure in three-dimensional space, utilizing vertical and lateral dimensions to create an effective resonating structure within a compact footprint
Solution Approach 2:
The housing serves multiple functions: it provides structural support, forms the antenna resonating element, and incorporates grounding paths, eliminating the need for separate antenna components and reducing overall device size
3Reliability
If the tuner is positioned close to the antenna to maximize wireless performance, then the antenna efficiency is improved, but the device complexity increases due to the need for multiple ground paths and conductive interconnect structures
Solution Approach 1:
The grounding path is merged with the housing structure and sensor module housing, integrating the grounding function into existing structural components rather than adding separate grounding elements
Solution Approach 2:
The sensor module housing serves dual purposes: it houses the sensors and simultaneously provides a conductive path to ground, eliminating the need for dedicated grounding structures in that region
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 configuration allows for efficient wireless communication by ensuring the antenna is coupled to ground structures as close as possible to the tuner, optimizing performance while accommodating sensor modules, thus enabling effective wireless operation in compact devices.
Implementation Method 1
The sensor module may form one or more ground paths from the tuner to the ground structures. The conductive spring may couple the tuner to a conductive structure in the sensor module.
Implementation Method 2
The conductive spring on the flexible printed circuit, the third conductive interconnect structure, and the fourth conductive interconnect structure may exert biasing forces in a first direction.
Data Source
AI summary
An electronic device may be provided with a sensor module and an antenna having an antenna arm, ground structures, and a tuner. The tuner may be mounted to a printed circuit overlapping the sensor module. A spring may be mounted to the printed circuit and may couple the tuner to a conductive chassis of the sensor module. The sensor module may include optical sensors that gather sensor data through a display and may form ground paths from the tuner to the ground structures. Conductive interconnect structures such as springs may exert biasing forces in different directions to couple the ground paths to different layers of the ground structures. This may serve to couple the antenna to the ground structures as close as possible to the tuner, thereby maximizing antenna performance, despite the presence of the sensor module.