how to design HPF for butterworth filter using ADS

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saiyidah

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Hye,i want to design HPF using ADS.But I've a problem where I don't know how to calculate the spec of interdigital capacitor which is for o/c stub.Can u help me to solve this problem?Here are my design spec:
FR-4
Er=4.9
Tand=0.019
t=0.035mm
h=1.6 mm
fc=2.5 Ghz
 

U mean, U want to replace an Open Ckt stub with an interdigital capacitor ??
 

SpaceDust said:
U mean, U want to replace an Open Ckt stub with an interdigital capacitor ??
Click to expand...

Yeah,i want to replace an o/c stub with interdigital capacitor.It is because my layout look like weird when I'm using the open cct.Here I attached my cct

stub
 

Hye everybody,could u help me to calculate the value for microstrip interdigital capacitor (MICAP 1) in ADS...I need the value for W,L,G and GE..i can't find MICAP type in my calculator..my spec is

FR-4
h=1.6mm
tand=0.019
t=0.035mm
Zo=80.9
f=2.5Ghz and 4 Ghz
E_Eff=90 degree
 

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