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TUNABLE FILTER APPARATUS COMPOSED BY COMBINING A MULTIBAND BPF(BAND PASS FILTER) AND A VARIABLE BPF OR THE MULTIBAND BPF AND A VARIABLE BSF(BAND STOP FILTER)
TUNABLE FILTER APPARATUS COMPOSED BY COMBINING A MULTIBAND BPF(BAND PASS FILTER) AND A VARIABLE BPF OR THE MULTIBAND BPF AND A VARIABLE BSF(BAND STOP FILTER)
PURPOSE: A tunable filter apparatus is provided to obtain a desired bandwidth and a center frequency by selecting at least one from preset multi-bands through a variable BPF(Band Pass Filter) or a variable BSF(Band Stop Filter).;CONSTITUTION: A tunable filter apparatus(100) includes a multiband BPF(Band Pass Filter)(110) and a variable BPF(120). The multiband BPF passes through only a plurality of frequency bands having a preset form from received signals. The multiband BPF is used as a filter passing through the multiband having 3 bands. Each band is designed to be a desired bandwidth and center frequency. The variable BPF passes one band from the multiband outputted in the multiband BPF according to the control signal for selecting the band. The variable BPF is used as the filter passing through only one band from 3 different variable bands.;COPYRIGHT KIPO 2012
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