Self-Supporting Antenna With Flexible Printed Circuit
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Solution Overview
Problem
There is a need for antenna technologies that can accommodate the size, cost, and performance requirements of small, thin, and affordable handheld devices for close-range wireless communication, such as RFID and NFC, while maintaining structural integrity and minimizing electromagnetic interference.
Innovation Solution
A self-supporting antenna comprising an electrically conductive wire with a width and length, forming one or more loops, and an adhesive layer, which is flexible and can be easily integrated into handheld devices and RFID tags, allowing for effective communication and electromagnetic interference suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional antenna structures are used in handheld devices, then antenna performance can be maintained, but device size and thickness increase
Solution Approach 1:
The patent applies this principle by using a flexible printed circuit board (FPC) as the antenna substrate, which is a thin film structure that enables the antenna to be integrated into slim handheld devices while maintaining functionality. The FPC allows the antenna to conform to thin device profiles without requiring rigid support structures.
Solution Approach 2:
The patent transitions from traditional planar antenna layouts to a three-dimensional spiral configuration on the FPC. This dimensional transformation allows the antenna to achieve resonant frequencies and impedance matching in a compact footprint by utilizing vertical stacking and spiral patterns that effectively increase the electrical length without increasing planar area.
2Volume of moving object
If antenna size is reduced for thin devices, then device thickness decreases, but antenna performance and structural integrity deteriorate
Solution Approach 1:
The FPC substrate provides a flexible yet structurally sound platform that maintains antenna integrity in thin configurations. The flexible nature allows the antenna to be bent and shaped to fit thin device profiles while the rigid circuit traces maintain electrical performance.
Solution Approach 2:
The antenna structure uses composite construction with conductive traces on the FPC substrate, combining the flexibility of the polymer base with the electrical conductivity of metal traces. This composite approach enables both thin profile and maintained electrical performance.
3Reliability
If conventional antenna integration methods are used, then antenna functionality is achieved, but electromagnetic interference increases
Solution Approach 1:
The patent extracts the antenna from traditional rigid PCB integration and relocates it to a flexible FPC substrate. This separation allows independent optimization of antenna geometry and positioning, enabling better EMI management through strategic placement away from interfering components while maintaining functionality.
Data Source
AI summary
An antenna includes a self-supporting electrically conductive wire having a width (W) and extending longitudinally along a length and between first and second ends of the conductive wire. The conductive wire forms one or more loops and comprises an electrically conductive layer disposed on and aligned with an adhesive layer. A width and a length of each of the conductive and adhesive layers are substantially co-extensive with the width and the length of the conductive wire.