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Adjusting impedance of a microstrip line at 40 ghz

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krparris

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I'm doing a simulation on a microstrip line at 40 ghz, and when I look at the impedance output (plot results -> Z parameters) i get the attached graph. Is there any way i can get rid of the resonances that occur at the quarter wavelength points (the material i'm working with is 10 mil RO 4350, so 40 ghz*sqrt(2.62 relative permittivity)/4 is the quarter wavelength in the material, which is about 16.2 ghz, which is shown in the graph. Is there any point to getting rid of the resonances? I thought it might help me get better S11 results, but I'm not sure.
 

Re: adjusting impedance

Apparently you are operating an unmatched transmission line. But what you are trying to achieve? I also can't follow your wavelength calculation. A wavelength can be expected to have a length dimension λ/4 may be around 20 mm at 40 GHz.
 

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