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How do you calculate the characteristic impedance for a reed relay, when the reed switch is a circular reed switch?

A reed relay designed to carry high frequencies will generally use a coaxial design approach.  With this in mind the formula to calculate the characteristic impedance  is the following: Z = 60/(√(€R) + ln(2h/d)) where Z is the characteristic impedance, √  is the square root, (€R)  is the dielectric constant between the shield and the reed switch, ln – is the natural log, h is diameter of the shield, d is the diameter of the reed switch.

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