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WHAT'S YOUR ENGINEERING QUOTIENT?

Problem 7—One end of a microstrip line (effective permittivity at 1GHz = 4) is left open, the other is terminated in matched load. What would be the impedance measured 37.5mm from the open end at 1GHz?

This means that 37.5 mm is a quarter of a wavelength. A l/4 section of a transmission line inverts the load impedance, so at 37.5 mm, the open circuit at the end of the line will be perceived as a short circuit.

Contributor: Michal Okoniewski

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