If you want to calculate the complex impedance of a given trace at a specific frequency for example if you want a piece of track to present a given impedance to an RF power amplifier or as part of a filter then a PCB transmission line calculator is the wrong tool because that is not what they are set up to do. It allows defining multiple load impedances (different frequencies), and adding components (discrete components and line sections) in series and parallel. Or a multi-layer dielectric field solver tool such as mdtlc: Download Free Smith Chart Graph Paper (PDF Version) Download PDF. Smith chart calculator linSmith is a Smith Charting program, mainly designed for educational use. If the signal frequency is so high that all the above effects start to matter then you should not be relying on a simple calculator but should be using tools like MWI: To first approximation, transmission line impedance is independent of frequency.Īs the signal frequency increases losses in the dielectric (substrate) and copper (skin effect and surface roughness) increase but the characteristic impedance is more or less constant. and a known (or measured) input impedance, the load impedance may be determined by means of the Chart or Calculator a convenient method of remotely determining. The type of calculator offered by JLCPCB is to calculate characteristic impedance of (a limited set of) PCB transmission line structures. Do you expect to see frequency in a trace impedance calculator?
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