Coaxial Cable Coupling Structure for Low-Profile Electronic Devices
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Solution Overview
Problem
Existing coaxial cable coupling structures on substrates with functional elements, such as piezoelectric or optical elements, often require increased installation height to accommodate the cable, which can hinder the effective operation of these elements by moving them further away from the equipment surface.
Innovation Solution
A method and structure where a functional element and first electrode are mounted on a substrate, covered with an insulating thin film, and a second electrode is exposed on the substrate-side surface of the insulating member, allowing the coaxial cable to be coupled without increasing the installation height of the substrate, using etching to create a pillar shape for the second electrode and folding the insulating member to facilitate cable coupling from the side or back.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a slit is formed on the top surface of the printed circuit board to couple the external conductor to coupling patterns, then the installation height of the coaxial cable can be reduced, but the functional element cannot be disposed close to the equipment surface
Solution Approach 1:
The patent transitions from a planar slit configuration to a three-dimensional structure where the insulating member extends vertically from the substrate surface. The second electrode is positioned on the side surface of this vertical extension, allowing cable coupling from the side rather than from above or below, thus resolving the conflict between installation height and functional element positioning.
Solution Approach 2:
The insulating member is divided into distinct functional zones: a first portion covering the functional element area, a second portion extending from the end of the substrate, and a third portion connecting these sections. This segmentation allows different regions to serve different purposes - protecting the functional element while providing cable access points at optimal locations.
2Ease of operation
If the functional element is disposed as close to the equipment surface as possible to attain sufficient effect, then the operation effect is improved, but the cable coupling structure requires increased installation height
Solution Approach 1:
The patent moves the cable coupling interface to the side surface dimension of the substrate rather than requiring vertical clearance. The insulating member extends laterally from the substrate end, and the second electrode is positioned on this lateral extension, enabling cable connection without increasing the vertical installation height profile.
Solution Approach 2:
The insulating member acts as an intermediary structure that mediates between the functional element on the substrate surface and the external cable. It provides electrical isolation while creating a dedicated coupling interface that does not interfere with the functional element's operation close to the equipment surface.
Data Source
AI summary
A structure includes a substrate on a surface of which a functional element and a first electrode are disposed, wherein the functional element provides a predetermined function by an operation based on an electrical signal and the first electrode is coupled to the functional element; an insulating member in a thin film that covers the surface of the substrate and extends from an end of the substrate; and a second electrode disposed on a substrate-side surface of the extending portion, which is extending from the end of the substrate, of the insulating member, wherein the second electrode is coupled to the first electrode. The second electrode is electrically coupled to a coaxial cable.