Compact Hairpin Filter Using Sonnet Software, I synthesized a five-section bandpass filter (BPF) on 20-mil-thick Rogers RO4350B laminate. The design began with a normalized low-pass Chebyshev prototype having 0.1 dB of ripple. The prototype was then transformed into a bandpass response, and the component values were converted into mutual coupling coefficients. Once the coupling coefficients … Continue reading Compact Hairpin Filter