LT spice help needed on simulating a Pi matching network

Thread Starter

Dimis

Joined Oct 24, 2017
17
Dear all hello,
I am new both in this forum as well at LT spice.
I am trying to simulate an Pi matching network with an input at 50 ohm output at 150 ohm and operating frequency from 66 to 86 MHz.
can someone let me know how to apply the above in the advanced settings window.
thanks in advance for your help.
Dimi.
 

Thread Starter

Dimis

Joined Oct 24, 2017
17
Hi again and thanks both for reply, mean that I am not sure how to set the parameters on the window for the source, maybe you can advice me what to select there.
 

Papabravo

Joined Feb 24, 2006
16,162
I'm not familiar with the "advanced settings" window. Could you maybe tell me how to find it?
A pi filter is normally a lowpass filter. You can transform it into a bandpass filter, but you have quite a wide bandwidth so that may not be an appropriate approach.
You can also cascade a lowpass and a high pass to get the right bandwidth, but the matching between the two sections, for a cascaded passive filter, could be a problem.
there many other things you forgot to specify including but not limited to:
  1. Allowable ripple in the passband
  2. Maximum insertion loss
  3. Width of the upper and lower transition bands
  4. Minimum attenuation in the stopband
 
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