• KJ7LNW
    1
    According to https://www.microwaves101.com/encyclopedias/microstrip, "Microstrip does not support a TEM mode, because of its filling factor."

    However, this article says that it works if the spacing to the dialectric is much smaller than the wavelength:
    With microstrip, a portion of the electric fields are in the dielectric between the strip and the ground plane while other fields exist in the region above the strip with air as a dielectric. At frequencies where the electrical distance in the dielectric material between the strip and ground plane is much less than a wavelength, microstrip behaves as a non-dispersive TEM line.Unlike moding in pure TEM lines, the transition in microstrip from TEM to quasi-TEM is not sudden. With increasing frequency, as the substrate thickness of microstrip becomes appreciable, the propagation velocity and the characteristic impedance of the line increase.HF Filter Design and Computer Simulation

    Does the 101 microstrip page need updating to indicate that?

    -Eric
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