How to analyze the low-speed circuit board signal
W represents the width of the printed line; t represents the thickness of the printed line; and εr represents the relative permittivity of the dielectric between the printed line and the reference plane.
H indicates the thickness of the medium between the printed line and the reference plane
transmission lines is the same. Characteristic impedance is an important parameter describing the electrical characteristics of the transmission line and the interaction between the signal and the transmission line. It is related to the material characteristics of the transmission line, the dielectric constant and the capacitance per unit length. It is the inherent attribute of the transmission line, regardless of the length of the transmission line. The characteristic impedance is also a major factor affecting the signal integrity in the transmission line circuit. In general, the characteristic impedance of a uniform microstrip transmission line
Transverse cross-section along the transmission line Geometry and characterization The constant transmission line is called a uniform transmission line. When the signal propagates over a uniform transmission line, the characteristic impedance at any one of the
