I'm having to re-learn RF design after years of not doing it. Can someone lead me in the right direction? If I have two RF networks, say two simple LC filters and I need to feed them both in parallel with the same source simultaneously, what are the steps? To make it easy, say each filter is 50 ohms in and out, filter one is a low pass filter, filter two is a high pass filter. I need to join the two inputs together, fed by the same source, so does that mean they look like 25 ohms in parallel? How do you make sure that the one filter which works fine doesn't have a bad effect on the second filters response?