Lecture 4f -- Multi Segment TL Devices

[@tensorbundle]

wow! Amazing insight can be developed through these calculations. We became too dependent on EM simulators and we miss out the joy behind these calculations.

[@Kaiser.Alexander.I]

Thank you so much for the great information! 👏🏼

[@michaellove7912]

Keep up. Amazing lecture!

[@empossible1577]

Thank you!

[@hamzahm.marhoon9256]

Thank you very much ❤

[@fuzzyelectrons]

How long is a quarter wavelength? That depends on the permittivity but in a previous lecture you used something called "effective relative permittivity" for microstrip lines. So for a microstrip line, should I compute the wavelength using the signal velocity gotten from the effective relative permittivity or just the relative permittivity?

[@empossible1577]

A quarter wavelength is whatever length of line is necessary for the signal on the line to accumulate 90 degrees of phase. This is calculated as L = pi / (2*beta) The phase constant beta depends on the design of the line, materials, etc.

[@fuzzyelectrons]

@@empossible1577 Obviously I had forgotten the phase constant depended on so many other parameters. I thought you would get L as L_0 * n = L_0 * sqrt(). Is that formula only valid for pure dielectric media with no conductors etc?

[@empossible1577]

@@fuzzyelectrons That formula is pretty close for lines with a homogeneous dielectric and no magnetic response. However, lines like microstrips are not homogeneous.

[@fuzzyelectrons]

@@empossible1577 That's great to know, thanks a bunch!