An_RF_Newbie
Member level 3
Hello,
Here is my circuit:
Regarding the transmission line theory , the input impedance of a shorted-circuit is Zin=Rin+JXin=J*Z0*tan(theta) and Rin=0. For a shorted-circuit quarter-Wavelength that theta=90, if should show the Xin=Infinity and again Rin=0. During my simulation I see the Rin became -50 ohm at resonance frequency and the Xin is a high number(we can assume infinity). I need to know why the Rin became -50 instead of zero.
Here is my circuit:
Regarding the transmission line theory , the input impedance of a shorted-circuit is Zin=Rin+JXin=J*Z0*tan(theta) and Rin=0. For a shorted-circuit quarter-Wavelength that theta=90, if should show the Xin=Infinity and again Rin=0. During my simulation I see the Rin became -50 ohm at resonance frequency and the Xin is a high number(we can assume infinity). I need to know why the Rin became -50 instead of zero.