ESTIMATING REJECTION PERFORMANCE
Bandpass Filters - Rejection can be determined at any frequency outside of the 3 dB bandwidth for any design with the following values: Center Frequency (Fc), 3dBc Bandwidth (BW3dB), and the Number of Sections. Rejection Plot are provides with normalization to the specified 3dBc bandwidths for filters with 3 to 8 sections.
To determine the Rejection (dBc) at a Rejection Frequency:
Rejection Plot 5-8% BW3dB (Combline/cavity and ceramic resonator filters )
Rejection Plot 9-12% BW3dB (All topologies)
Rejection Plot 13-16% BW3dB (Lumped element and combline/cavity filters)
Rejection Plot 17-20% BW3dB (Lumped element and combline/cavity filters)
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