Filter unit having two attenuation poles
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United States of America Patent
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Mar 11, 2003
Grant Date -
Sep 26, 2002
app pub date -
Sep 25, 2001
filing date -
Mar 23, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A filter unit comprising a band-pass filter for passing signals of a specified frequency band, a SAW filter for passing signals of a band around a frequency fp2 positioned between a cutoff frequency fc of the band-pass filter and an attenuation pole frequency fp1 thereof, and an inversion circuit for inverting the phase of the signal passing through the SAW filter and superposing the phase-inverted signal on an output signal from the band-pass filter.
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