What does ZEFF stand for?

Effective Impedance

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Samples in periodicals archive:

Metamaterials can be used to tailor the effective impedance of a substrate or ground plane or to improve an antenna's radiation pattern and efficiency.

Antenna design tool simulates metamaterials

At the junction point, the effective impedance is then 100/3 = 33.

Topology characteristics of reliable bus design: symmetry, minimized ...

The effective impedance of two resistors in series is just the sum of the two individual resistance values.

Evaluation of organic coatings with Electrochemical Impedance ...

The effective impedance and propagation delay for loaded microstrip and symmetric stripline.

Loading effects on transmission lines, Part 2: a minimum loaded line ...