Antenna Contacting Assembly Traction Mode PCB Integration
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Solution Overview
Problem
In wireless devices with small PCBs and high component density, conventional spring contacts require significant space for horizontal displacement, leading to overhead issues and inefficiencies, while POGO pins are expensive and inconvenient for design integration.
Innovation Solution
An antenna contacting assembly that operates in traction mode, with a curved second portion that reduces transverse displacement, allowing for smaller contact pads on the PCB and enabling electrical connection between the antenna element and the RF module with reduced space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional spring contact is used to ensure electrical connection between antenna and RF front-end, then good electrical continuity is achieved, but significant horizontal displacement space is required on the PCB
Solution Approach 1:
The patent inverts the conventional compression mode to traction mode. Instead of compressing the spring contact downward onto the PCB pad, the antenna element is pulled upward through the spring contact. This inversion changes the displacement characteristics, allowing the spring lever's center of curvature to be positioned closer to the tip, thereby reducing the horizontal displacement distance required on the PCB surface while maintaining reliable electrical contact.
Solution Approach 2:
The patent changes the operational parameter from compression to traction. By applying tensile force instead of compressive force, the spring contact's mechanical behavior is altered. The spring lever rotates about a center of curvature that is strategically positioned to minimize horizontal displacement in traction mode, thus reducing the required PCB pad length while ensuring adequate contact force for electrical continuity.
2Area of stationary object
If a POGO pin is used to reduce contact area, then space on PCB is reduced, but component cost and design complexity increase
Solution Approach 1:
The patent makes the antenna element itself serve the dual function of both radiation and mechanical contact. The antenna element acts as both the electromagnetic radiator and the pulling mechanism that engages the spring contact, eliminating the need for separate POGO pins. This multi-functionality reduces component count and simplifies design integration while achieving compact contact area.
Solution Approach 2:
The patent extracts the unnecessary POGO pin component from the system by making the antenna element directly perform the contact function. By removing the intermediate POGO pin and using the antenna element itself to engage the spring contact in traction mode, the design achieves reduced contact area without the added complexity and cost of additional components.
3Reliability
If spring contact lever is positioned far from PCB to ensure contact, then electrical connection is reliable, but parasitic capacitive effects increase
Solution Approach 1:
The patent utilizes curved geometry in the spring contact lever design. The lever is formed with a specific curvature radius that allows it to rotate smoothly about a center of curvature during traction. This curved geometry enables the lever to maintain an optimized position relative to the PCB pad, ensuring reliable contact while minimizing the distance between the antenna element and PCB, thereby reducing parasitic capacitive effects.
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 solution allows for efficient integration of antenna systems in densely populated PCBs, reducing parasitic capacitive effects and enhancing repeatability of electrical parameters, while enabling more flexible antenna design and testing, particularly in slim form factor devices.
Implementation Method 1
a curved second portion (32b) that reduces transverse displacement
Implementation Method 2
The antenna contacting assembly provides electrical contact between a first conducting surface and a second conducting surface by engaging in traction mode said first conducting surface with said second conducting surface
Data Source
AI summary
This invention refers to an antenna contacting assembly which allows electrical connection of an antenna element to the RF module of a wireless device when very little space is available on the side of the PCB underneath the antenna element. The antenna contacting assembly provides electrical contact between a first conducting surface and a second conducting surface by engaging in traction mode said first conducting surface with said second conducting surface. Further the invention refers to an antenna system provided with such antenna contacting assembly and the corresponding wireless device with an antenna system provided with such antenna contacting assembly.