A little disclaimer. Electronics is a hobby to me so I learn it on my spare time. This leads to certain knowledge gaps that professionals might not have.
I want to build a good filter using SMD components. I started from some existing design I found online and trying to modify components and parameters in order to achieve the good results. I lack in theory heavily so I would welcome a good literature references.
I found LTSpice and started playing around. I learned how to step through parameters.
The only thing that concerns me is impedance matching. CT/CB are forming the divider and I want to optimize schematic for optimal Q while preserving 50 Ohm i/o impedance.
The problem here I don't know how to do these optimizations while I remain within assortment of available components. Plus there are tolerances on them which also should keep the schematic working fine.
My question is - what I should read or where to find an information or methodology to design such filters properly and suitable for manufacturing?
Answers for questions:
Type of the filter - band pass filter for ham-radio transceiver. So I have low signal levels. Low losses are very important because the signal will come from the antenna.
Frequency range: HF, 1.5MHz-30MHz. Bandwidth depends on the band. I am not sure about the ripple, the lower the better but I think 1db should be ok.
Source has a series resistance set to 50 Ohm in Parasitic Impedances section. My load is a resistor of 50 Ohm.
With regards to the components Q - ideally I want to use a inductances table from manufacturer which already has a Q measured. But I don't know how to use this table inside LTSpice because it has inductance+DCR+Q at the same time. Plus, there are tolerances that affect filter performance.
Also, the filter works at the higher impedance than its input output (CT/CB make a some sort of capacitive transformer).
Right now I am pretty much lost because I am trying to find the best fitting curve with lowest losses. Plus how to keep input/output impedance the same 50 Ohm?