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Design a Composite low pass filter by image parameter method for following specifications: R0=50Ω,fc=50MH2,f=52 MH2
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Solution:

z0=R0=LC=50Ω

with constant k section low pass filter,

WC=2LC=2πfCC2π×50MH2=2LC50π×106=1LCLC=150π×106LC=4.05×1017

LC=2500L=2500C2500C2=4.05×1017C=0.127nFL=0.318MH

m-derived low pass filter:

m=1f2cf2=1502522HH2=0.274L/2=0.159μH,C=0.127nFmL2=0.043μH,mC=0.034nF(1m24 m)2L=0.268μH

1lp \& Olp matching sectious:

0.3 L=0.095μH0.3C=0.038nF(8]15)L=0.1696μH

enter image description here

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