Was lucky enough to get this featured on Hackaday! See: Rapidly Prototyping RF Filters
A guide to simulating microstrip filters in QUCS and prototyping them with copper tape on blank FR4 sheets. These super-cheap materials are good up to a couple gigahertz, as you'll see in the video.
Following a quick real-time demonstration, I simulate and build 2 microstrip filters, a 1GHz stepped-impedance LPF, and a 10GHz end-coupled BPF.
(Checkout the youtube description section for active timecode links)
2:05 - 1/4 wavelength stub build & tests
3:46 - Radial stub build & tests
4:18 - Stepped impedance microstrip LPF design
6:42 - Stepped impedance microstrip LPF build & tests
9:10 - Trimming the stepped impedance LPF
10:26 - Brief tutorial on synthesizing filters in QUCS
14:51 - Synthesizing a 10GHz end-coupled microstrip BPF
18:33 - 10GHz end-coupled BPF build & tests