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# How do I calculate an input impedance?

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#### isend

##### Newbie level 3
what input impedance do i need

This may look like a basic homework problem, but I am just learning... I have a lossless transmission line (characteristic impedance = 70 Ohm, 1.5 cm long) connected to a load of 50 Ohm. How do I calculate the input impedance of this combination? I think Zin should be dependent on the RF frequency due to the impedance mismatch; something looks like:

but I need a formula for it. Where may I find some instructional material online which I can follow to calculate the input impedance for my setup? Thank you very much.

input impedance calculation

Hi

you will find plenty...like Wikipedia

regards

how do i calculate 70% of 1.50%

Zin = Zo (ZL + Zo tan (βl))/(Zo+Zl tan(βl))

calculating input impedance

how is it? can you get the answer?

equation to calculate the input impedance

Hi

You have already been given the formula to compute this impedance by dhavalelectron...

regards,

find the input impedance calculate

Thank you dhavalelectron! I also found the formula in Wikipedia following tyassin's instruction. Thank you everyone!

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