This document provides information on transmission line models and calculators for printed circuit boards. It discusses the stripline and microstrip models for calculating characteristic impedance and transmission line losses using perturbation methods. It provides examples of calculating line width for different stripline and microstrip configurations. Finally, it lists some online calculators and CAD tools for transmission line design and includes references for further reading.

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PCB calculator
Jay Chang

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Stripline model
給線寬W, height b, ߳‫ݎ‬, 求Z0

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Stripline model
給Z0, height b, ߳‫ݎ‬, 求線寬W

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Stripline model
perturbation method求loss ߙ = conductor loss + dielectric loss

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Microstrip model
For low frequency and DC (for infinitely thin conductors)

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Microstrip model
給線寬W, height d, ߳‫ݎ‬, 求Z0 (for infinitely thin conductors)

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Microstrip model
給Z0, ߳‫ݎ‬, 求W/d (for infinitely thin conductors)

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perturbation method求loss ߙ = conductor loss + dielectric loss
Microstrip model

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Microstrip model
給線寬W, height h, ߳‫ݎ‬, 求Z0 and ߳݁
(for finite thickness)

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Microstrip model
Frequency-Dependent Effects
For example:

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http://www.desmith.com/NMdS/Electronics/TraceWidth.html
http://wcalc.sourceforge.net/cgi-wcalc.html
Good website
算最大電流附載線寬(including temp)
算microstrip等效RLC model
reference
Pozar, Microwave Engineering 4th Edition
Hall, Advanced Signal Integrity For High-Speed Digital Designs
CAD tools
TXLINE (NI AWR)
AppCAD (Agilent)
Python verification for freq-dependent