So I explain a little bit why this question, and what I did.
I really wanted to be able to record the data of a NOAA weather satellite on 1.7Ghz, the pass was in a few hours, so I needed a working filter in a few hours. So I choose the lumped components way instead of the microstrip or cavity to be able to have something very quick.
Because now I understand what cause losses in filters (thank you all
), I choose a 7th order high pass. I found that I needed 1pF and 1,5pF luckily I had them in my SMD C0G capacitor bag. Then I used the kicad calculation tool to have the size of the track at 50ohm. Then with my swiss army knife I made the pcb on scrap dual side FR4. Then for the coil I first tried with a longer coil, thinking that I could space the winding for tunning the filter. I ended to build several smaller coils. Each time I was able to see the filter band pass going higher in frequency. At the end I only had a little pice of wire of maybe 4mm. And the match was good, maybe -25dB RL, and in the band pass (of interest) the losses are only 0.8dB to 1,5dB.
For a quick little filter it's good
But I managed to miss the satellite pass because of the power supply of the LNA ...