I have been trying to implement an order 5 Chebyshev LPF by using Kuroda's identity and Richard transformations to convert the standard circuit to microstrip lines and open stubs. This is the design I ended up with but the IL and RL in no way look similar to an LPF so there must be something fundamentally wrong with what I'm doing but I'm not able to figure it out. 
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- 1\$\begingroup\$ Please improve the question. For example, in what way exactly does IL and RL look "no way" similar to an LPF to you? I'm a hobbyist and I stay completely away from anything over about 500 MHz and mostly stay at 100 MHz and below, where I don't have to keep using Laplace domain and scattering parameters. But here's a hairpin distributed element bandpass and this yields this schematic in your 3 GHz band area. So please explain yourself better. How do you judge what looks right? \$\endgroup\$periblepsis– periblepsis2025-11-02 22:45:54 +00:00Commented Nov 2 at 22:45
- \$\begingroup\$ I’m not familiar with those transmission line components. The properties look strange. Usually ideal lines in simulators take two parameters: the characteristic impedance and a delay (which corresponds to the length of the line). Have you tried using a different simulator, such as LTspice? \$\endgroup\$Ste Kulov– Ste Kulov2025-11-03 14:33:17 +00:00Commented Nov 3 at 14:33
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