design of an oscillator at 9 Ghz

[LeThalois]

hello every one.

Please, can anyone help me , how to find the highlighted result in the attached picture , i don't know how to find it.

thank you from the bottom of my heart.

 

[D.A.(Tony)Stewart]

Did you try the stripline defined to get -j75?

 

[LeThalois]

sorry i didn't understand you
what i am asking about is how to reach that result theoretically

 

[D.A.(Tony)Stewart]

Search for Stripline design and plug in the numbers given.
Length is based on material dielectric constant and fraction of 0.092 wavelength or conversely the frequency at which it is a 1/4 wave or 1/2 wave.

You would want to choose low loss tangent dielectric like teflon , ceramic or perhaps some excellent polyamide

Calculations for Zo and pF/" here

https://www.analog.com/static/imported-files/tutorials/MT-094.pdf

...Can be used to derive the suggested solution.

 

[LeThalois]

thanks a lot dear brother sunny