微带线特征阻抗计算器
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Microstrip Impedance Calculator
Inputs
Trace Thickness
T
Substrate Height
H
Trace Width
W
Substrate Dielectric
Er
Output
特征阻抗（Z）：
Introduction
The microstrip is a very simple yet useful way to create a transmission line with a PCB. There are some advantages to using a microstrip transmission line over other alternatives. Modeling approximation can be used to design the microstrip trace. By understanding the microstrip transmission line, designers can properly build these structures to meet their needs.
Description
A microstrip is constructed with a flat conductor suspended over a ground plane. The conductor and ground plane are seperated by a dielectric. The suface microstrip transmission line also has free space (air) as the dielectric above the conductor. This structure can be built in materials other than printed circuit boards, but will always consist of a conductor seperted from a ground plane by some dielectric material.
Microstrip Transmission Line Models
Models have been created to approximate the characteristics of the microstrip transmission line. The source for these formulas are found in the IPC-2141A (2004) “Design Guide for High-Speed Controlled Impedance Circuit Boards”
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