Layered RF Connector With Coupling Membrane for Flexible Interfaces
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Solution Overview
Problem
The integration of flexible antennas with electronic components in wearable technology faces challenges due to mechanical stress and environmental vulnerabilities, particularly at the interface where flexible and rigid components meet, leading to durability issues and performance compromises.
Innovation Solution
A flexible RF connector design that facilitates a snap-fit mechanism for quick attachment and detachment, utilizing a non-conductive membrane for waterproof insulation and ensuring less than 1 dB connection loss, eliminating the need for galvanic contacts and allowing for broadband operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SMA connectors are soldered directly onto conductive fabrics or flexible membranes, then electrical connection is established, but mechanical stress resistance and durability deteriorate
Solution Approach 1:
A rigid support structure is introduced as an intermediary between the flexible antenna and the electronic component. This support structure provides mechanical strength and stability while the flexible antenna maintains its flexibility. The connector is mounted on the rigid support structure rather than directly on the flexible fabric, eliminating the mechanical stress concentration at the connection point.
2Ease of manufacture
If conductive paste is used to connect flexible antennas, then electrical connection is achieved, but connection reliability deteriorates due to cracking after minimal flexion
Solution Approach 1:
The mechanical connection method using conductive paste is replaced with a standardized electrical connector system. The connector includes a flexible printed circuit board with soldered contacts that mate with a corresponding receptacle on the electronic component. This substitution provides a more robust mechanical and electrical connection that can withstand repeated flexing and assembly/disassembly cycles.
3Reliability
If coaxial cable is embedded into fabric through sewing or embroidery, then electrical connection is established, but manufacturing complexity and labor intensity increase
Solution Approach 1:
The connection system is segmented into distinct functional components: the flexible antenna, the rigid support structure with integrated connector, and the electronic component. This segmentation allows each component to be manufactured separately using optimized processes and then assembled through a standardized connector interface, enabling mass production and assembly automation.
4Ease of operation
If traditional connectors are used at the interface between flexible and rigid components, then electrical connection is established, but mechanical stress concentration and durability issues occur
Solution Approach 1:
The connector design transitions from a planar connection to a three-dimensional engagement. The connector includes a rigid support structure that extends perpendicular to the flexible antenna surface, creating a vertical mounting dimension. This dimensional transition distributes mechanical stresses away from the flexible-fabric interface and provides a stable mounting platform for the connector.
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
The solution provides a durable, low-loss connection that withstands real-life usage demands, enhancing antenna performance and wearability without compromising flexibility or comfort, and supports easy detachment for practical considerations like garment washing.
Implementation Method 1
said members being isolated by a coupling membrane, wherein the first layered member comprises a first mating aperture, arranged to receive the RF signal from the first microwave element via first of the coupling interfaces, and the second layered member comprises a second mating aperture, arranged to connect the received RF signal to the second microwave element via second of the coupling interfaces
Data Source
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AI summary
The present invention relates to a device (101) for connecting RF signal between a first (901) and a second (902) microwave element, the device (101) comprising coupling interfaces (121, 122), wherein the device (101) is arranged to facilitate said connection with less than 2 dB coupling loss between said interfaces (121, 122) at a first frequency. The device is a connector arrangement (101) that comprises a first (405) and a second (406) layered member structured to be mated with a fixturing member (150) of the device (101), and said members (405, 406) being isolated by a coupling membrane (510), wherein the first layered member (405) comprises a first mating aperture (602), arranged to receive the RF signal from the first microwave element (901) via first of the coupling interfaces (121), and the second layered member (406) comprises a second mating aperture (603), arranged to connect the received RF signal to the second microwave element (902) via second of the coupling interfaces (122).