Flexible Antenna Loop Layout Without Soldered FPC Connections
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Solution Overview
Problem
The integration of contactless communication antennas in portable devices poses challenges due to miniaturization constraints, interference from other communication modules, and high manufacturing costs associated with flexible printed circuits that are not fully utilized, especially when designed to wrap around screens.
Innovation Solution
A flexible printed circuit with at least two parallel conductive tracks forming antenna loops, where the tracks connect within a connector to form a multi-turn antenna without the need for soldering, reducing manufacturing costs and allowing for efficient placement in three-dimensional spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible printed circuit is designed to wrap around the screen to place the contactless antenna close to the user interface, then the antenna radiation efficiency is improved, but the manufacturing cost increases due to the large surface area of the flexible circuit required
Solution Approach 1:
The flexible printed circuit is divided into multiple segments or strips that are connected in series to form the antenna loop. Instead of using a single large-area flexible circuit wrapping around the screen, the antenna is constructed from several smaller flexible circuit segments joined together, reducing the total surface area required and thus lowering manufacturing costs while maintaining the antenna's radiation efficiency
Solution Approach 2:
The antenna configuration transitions from a two-dimensional surface wrapping around the screen to a three-dimensional folded structure. The flexible printed circuit segments are arranged and connected in a folded configuration that achieves the necessary antenna geometry and radiation characteristics without requiring a large planar surface area, thereby reducing manufacturing costs
2Reliability
If soldering is used to connect the flexible printed circuit to form the antenna loop, then the connection reliability is improved, but the manufacturing complexity and cost increase due to the need for solder-resistant materials and soldering processes
Solution Approach 1:
The soldering process is replaced with a mechanical connection method. The flexible printed circuit segments are connected through mechanical means such as snap-fit connectors, friction fits, or interlocking structures that join the segments without requiring soldering, hot air reflow, or other thermal processes, thereby eliminating the need for solder-resistant materials and simplifying the manufacturing process
Solution Approach 2:
The flexible printed circuit segments are designed with self-connecting features that allow them to join together automatically through their own structural characteristics. The segments may have complementary geometries, elastic elements, or friction-based connection mechanisms that enable self-assembly without additional joining processes, reducing manufacturing complexity and eliminating the need for soldering
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 simplifies the implementation and reduces manufacturing costs by eliminating the need for soldering and expensive solder-resistant materials, enabling a more economical and efficient production of contactless communication antennas for portable devices.
Implementation Method 1
The antenna is a device making it possible to radiate (transmitter) or, pick up (receiver), electromagnetic waves
Data Source
AI summary
A flexible printed circuit including at least two conductive tracks extending along the length of the flexible printed circuit. The conductive tracks form at least two antenna loops. The at least two conductive tracks are substantially parallel to one another. A contact zone located at a first end of the flexible printed circuit is configured to contact a predetermined portion of the flexible printed circuit so that a first track of the flexible printed circuit is connected with a second track of the flexible printed circuit when the first end is placed in contact with the predetermined portion.