HardwareChap
Junior Member level 1
I realise that for maximum power transfer, the input and output impedance of filters should match the impedance of whatever they're connected to (in this case 50 Ω in and out). My question is, should the PCB tracks between the Ls and Cs, that make up a complete filter, use track widths that equate to 50 Ω? My thought is that if you follow the filter round a Smith Chart, it will deviate from 50 Ω, but work its way back there in the end. Is the deviation from 50 Ω negligible, so the rule of thumb is to control track impedance and set it at 50 Ω?