Rear-Facing Antenna Grounding Through Sensor Flex Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic devices with wireless communications capabilities face challenges in achieving compact form factors while maintaining efficient antenna performance and minimizing interference with other components.
Innovation Solution
The electronic device incorporates a housing with conductive sidewalls and a rear wall featuring dielectric portions that house a sensor board and a coil structure, an antenna that radiates through the rear wall, and uses a sensor flex with ground traces to eliminate the need for external grounding clips, grounding the antenna through the sensor flex.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external grounding clips are used to ground the antenna, then the antenna can be properly grounded, but the device becomes bulky and loses compactness
Solution Approach 1:
The patent combines the grounding function with the existing sensor flex circuit board by integrating ground traces onto it. This merges two separate functions (sensor connectivity and antenna grounding) into a single component, eliminating the need for separate external grounding clips and reducing overall device volume while maintaining reliable antenna grounding.
2Reliability
If larger antenna volumes are used, then antenna efficiency bandwidth increases, but the device form factor becomes less compact
Solution Approach 1:
The patent utilizes the vertical stacking of dielectric layers and conductive traces on the sensor flex to create a three-dimensional antenna structure. By transitioning from a planar to a multi-layer spatial configuration, the antenna achieves greater effective volume and improved efficiency bandwidth without increasing the device's external footprint.
3Volume of moving object
If antennas are placed close to other components, then the device can be more compact, but interference between antennas and components increases
Solution Approach 1:
The patent uses dielectric portions as intermediary materials positioned between the antenna traces and other components such as the coil structure. These dielectric layers act as electromagnetic shields and isolators, reducing interference and coupling between the antenna and nearby components while allowing the device to maintain a compact form factor.
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 enhances antenna performance by eliminating the need for bulky external grounding clips, allowing for efficient wireless charging and reduced interference, while maintaining a compact form factor.
Implementation Method 1
The coil structure may be mounted within the cavity and may laterally surround the sensor board. The coil structure may be used to receive wireless charging signals through the rear wall.
Implementation Method 2
The electronic device may include an antenna that radiates through the rear wall.
Data Source
AI summary
An electronic device may have conductive sidewalls and a rear wall. A sensor board may be mounted within a cavity defined by the rear wall. The device may have an antenna with a resonating element that includes a first trace on the rear wall, a second trace on the sensor board, and a conductive interconnect between the first and second traces. A sensor flex may be coupled to the sensor board. The sensor flex may include signal traces that control sensors on the sensor board. The sensor flex may include ground traces coupled to the conductive sidewalls by a conductive interconnect. The ground traces may be coupled to a first grounding point on the first conductive trace and may be coupled to a second grounding point on the second conductive trace. A switch may be disposed on the ground traces for tuning a response of the antenna.