AC2 Fundamentals Unit 6 – Bandpass and Bandstop Filters
Like bandpass filters, bandstop filters can be implemented by connecting a series or parallel
resonant circuit with a resistor.
A bandstop filter, or band reject filter, rejects a narrow range of frequencies but passes
frequencies above and below that range. The range of frequencies rejected by a bandstop filter is
the bandwidth (B), which depends on the upper (f 2 ) and lower (f 1 ) cutoff frequencies.
Resonant bandpass and bandstop filters select a specific range of frequencies.
NEW TERMS AND WORDS
bandpass filters - a circuit that passes frequencies over a narrow range, or band, of frequencies
and rejects those above and below this range.
bandstop filters - a circuit that rejects frequencies within a narrow band and passes those above
or below this band; also called a band reject filter.
center frequency - resonant frequency.