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Are you designing an active or passive filter.?
What application? Practical project or just the simulations?
Now that you have cutoff frequencies, try to select RLC values.How are cutoff frequencies related to Rand C or R,C,L?
What do mean when you say your circuit is zero? Is this bandpass or bandreject operation?
no its rf front end receiver for 3g mobile equipment i want s parameter for simulation on ads and module
1)band pass filter(856562 triquint company s parameter is needed)
2)i/q mixer (maxim max2023) module is needed
plz i really need help
Do you have somebody around you that has some understanding of filter design?
If so, let him carry out a LPF to BPF transformation for a prototype Chebyshev low pass filter. All L in the LPF becomes LC series circuits and all C in the LPF become LC parallel circuits in the BPF. Component values for LPF prototype filters you can find in several books on analog design.
As you only need it in simulation, you don't need the "series circuit" to "parallel circuit" transformation (this saves you time). Start with a third or fifth order LPF, this will give you the BPF (just use ideal components), run an S-parameter simulation on it and you can copy the S-parameter file as a new component in your (system) simulation.
I think many people are willing to help you, but when we don't know what you have it is impossible. When is an OEM filter, the datasheet may not be in the public domain. Did you try to contact the vendor?
If you have the filter, try to measure it yourself. When you don't have a VNA, carry out a scalar measurement of S21 and do a S11 measurement based on a slotted line or other cost effective method. When you have more filters, dismantle one to see the number of poles and coupling method.
With this info you can model your own filter and you continue with your project. your posting is from March 23, so it is likely that you have to do it yourself.
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