Polycrystal Transmission Line for Lower High-Frequency AC Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High frequency signals experience significant transmission loss due to increased AC resistance in metal transmission lines, particularly at frequencies between 3 MHz and 5 MHz, as the skin effect and counter-electromotive force hinder current flow in the central portion of the metal.
Innovation Solution
A high frequency transmission device utilizing a dielectric with a transmission line composed of resistance reducing materials, such as polycrystals made from conductor or semiconductor fine particles, where the AC resistance value drops sharply within specific frequency bands, reversing the direction of the induced electromotive force to facilitate signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a metal transmission line is used for high frequency signal transmission, then the transmission line provides good electrical conductivity, but the AC resistance value increases due to skin effect, resulting in significant transmission loss
Solution Approach 1:
The patent changes the physical and chemical parameters of the transmission line material by using polycrystals with specific grain sizes (1 nm to 100 nm) and controlled crystalline structures. This parameter change transforms the material's electrical properties, causing the AC resistance to decrease sharply at specific frequency bands (3 MHz to 5 MHz and higher), thereby reducing transmission loss while maintaining signal reliability
Solution Approach 2:
The patent employs composite material structures, specifically polycrystalline materials composed of multiple fine grains with controlled sizes and distributions. This composite structure at the micro level creates unique electromagnetic properties that reduce skin effect and counter-electromotive force, enabling low transmission loss at high frequencies while maintaining overall structural integrity and conductivity
2Ease of manufacture
If the transmission line is made of conventional metal, then the manufacturing process is simple, but the counter-electromotive force in the central portion hinders current flow, increasing AC resistance
Solution Approach 1:
The patent transforms the material parameters from conventional metal to polycrystalline structure with specific grain size distributions (1 nm to 100 nm). This parameter change fundamentally alters the electromagnetic response of the material, reducing counter-electromotive force generation in the central portion and enabling low AC resistance at high frequencies while maintaining manufacturability through established polycrystal fabrication techniques
3Loss of energy
If polycrystal composed of iron nanoparticles or metal grade silicon nanoparticles is used, then the AC resistance value drops sharply at specific frequencies, but the manufacturing process becomes more complex
Solution Approach 1:
The patent optimizes the polycrystal material parameters, specifically controlling grain size distribution (1 nm to 100 nm) and crystal orientation, to achieve sharp AC resistance reduction at target frequency bands. This parameter optimization enables the use of conventional polycrystal fabrication methods while achieving the desired electromagnetic performance, balancing manufacturing complexity with transmission loss reduction
Solution Approach 2:
The patent applies local quality control by creating polycrystals with specific grain size distributions and crystalline structures in different regions or layers of the transmission line. This allows optimization of electromagnetic properties at specific locations where high frequency signal transmission occurs, while maintaining simpler structures in other areas, thereby managing overall manufacturing complexity
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 significantly reduces transmission loss of high frequency signals by lowering AC resistance and reversing the counter-electromotive force, enhancing signal reliability and connection reliability through the use of polycrystals in the transmission line.
Implementation Method 1
a direction of an induced electromotive force (counter-electromotive force) generated in a central portion of the resistance reducing material is reversed in a case where a high frequency signal to be transmitted through the transmission line is of frequencies within one or more specific frequency bands, the induced electromotive force being generated due to a magnetic field generated due to the high frequency signal
Implementation Method 2
skin effect causes the alternating current to flow near the surface of the metal but hardly flow toward the central portion of the metal, resulting in increase of the alternating current resistance (AC) value of the metal
Data Source
AI summary
A polycrystal having a physical property that enables an AC resistance value to drop sharply is used to reduce transmission loss of a high frequency signal being transmitted. A high frequency transmission device D1 is provided that includes a dielectric 100 and a transmission line 200 adapted for transmitting therethrough high frequency signals. At least part of the transmission line 200 is located on or inside the dielectric 100. At least part of the transmission line 200 is composed of a polycrystal composed of conductor fine particles. The polycrystal has a physical property such that, when a high frequency signal to be transmitted through the transmission line 200 is of frequencies within one or more specific frequency bands, the AC resistance value drops sharply.