Structure Comb-line (tapped)Interdigital (tapped) Response ChebyshevButterworth Order n Ripple (dB) Centre f0 Bandwidth (%) ripple BW (Chebyshev), 3 dB BW (Butterworth) Line length θ0 (°) Resonator Z_r (Ω) line impedance with neighbours grounded ε_r Port R0 (Ω) Realise in microstrip widths, gaps, vias by the field solver (manual §7.6); ε_r above is then unused Ground vias × drill, and vias per shorted end Loading capacitors idealSMD 0402SMD 0603SMD 0805trimmer (Murata TZC3)printed pad with pads, ESL and ground vias (manual §7.5) E-series (SMD) E24E12 Capacitor substrate pads and vias only; the lines keep ε_r