Filter Shape Factor and Selectivity

The Ideal Filter would have a unit gain (0dB) in its passband and a gain of zero (-infinity dB) in its stop band. Between the pass band and stop band, there would be no indecision and would transition from 0dB to -infinity dB asymptotically.

Q factor - Wikipedia

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High-frequency crystal filters for s.s.b.

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Calculation of shape factor and skirt selectivity factor.

Realization of dual-mode, high-selectivity SIW cavity bandpass filter by perturbing circular shape vias

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