Transmission Path Termination Layout for Stable Impedance
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Solution Overview
Problem
Noise is caused in wireless communication systems due to impedance disorder between a transmission path connected to a signal source and a resistor, particularly in systems involving moving parts like robots and manufacturing systems.
Innovation Solution
A communication apparatus with a transmission path on a substrate, a metal member as a ground, and a termination circuit on the substrate surface, which includes a space between the metal member and the transmission path to stabilize impedance and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission path is connected to a signal source and terminated with a resistor, then data communication can be performed, but noise is caused due to impedance disorder
Solution Approach 1:
The patent changes the physical parameter of the termination circuit by arranging it on the substrate surface rather than making direct contact with the ground. This spatial parameter change maintains impedance matching while reducing noise coupling between the termination resistor and ground, thereby resolving the contradiction between reliable data communication and noise reduction
2Stability of the object's composition
If a ground portion is placed close to the transmission path, then impedance stability can be improved, but geometric and fixing shifts cause impedance disorder
Solution Approach 1:
The patent introduces the substrate surface as an intermediary arrangement for the termination circuit. By placing the termination circuit on the substrate surface with a space between it and the ground, the design reduces sensitivity to geometric and fixing shifts while maintaining stable impedance characteristics, thus resolving the contradiction between impedance stability and manufacturing precision
Data Source
AI summary
A communication apparatus includes a transmission path arranged on a substrate, a signal source connected to an input portion of the transmission path, a metal member configured to function as a ground portion for the transmission path and having a space between the metal member and the transmission path, and a termination circuit configured to terminate the transmission path, wherein the termination circuit is arranged on a surface of the substrate on which the metal member is arranged.