🔹 FBW (%) = (f₂ – f₁) / f_center × 100 where f_center = (f₁ + f₂) / 2
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Ever designed a filter, antenna, or amplifier and wondered: “How wide is my band, really?” 🔹 FBW (%) = (f₂ – f₁) /
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For waveguide or cavity filters, fractional bandwidth also influences Q-factor and insertion loss. Low FBW = higher Q, narrower tuning range.