Nominal frequency

The nominal value of centre frequency, and shall be used as the basis of detail specifications.
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Pass band width

The spacing between two frequencies at which the relative attenuation is equal to or below the specified value in the pass band.
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Attenuation Band width

The spacing between two frequencies at which the relative attenuation is equal to or above the specified value in the attenuation band.
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Insertion loss

The minimum value of working attenuation within the pass band.
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Ripple

If there are maximum values of attenuation in the guaranteed pass band, the maximum value among the differences between the maximum loss and the minimum loss.
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Guaranteed attenuation

The guaranteed relative attenuation in the attenuation band.
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Spurious

The attenuation caused by the extraordinary response in the attenuation band.
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Group delay distortion

The difference between maximum and minimum group delay in the pass band.
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Terminal impedance

The power source impedance or load impedance viewed from the filter side.