Stopband
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A stopband is a band of frequencies, between specified limits, in which a circuit, such as a filter or telephone circuit, does not let signals through. Frequencies between the lower and upper limits are not transmitted.
The limiting frequencies are those at which the transmitted power level increases to a specified level, usually 3 dB below the maximum level, as the frequency is decreased or increased from that at which the transmitted power is a minimum. The difference between the limits is the stopband bandwidth, which is usually expressed in hertz.
Source: from Federal Standard 1037C and from MIL-STD-188
See also
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