Filter unit and duplexer comprising such filter units

A filter unit comprises 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...

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Bibliographic Details
Main Authors NITANI YASUO, KODAMA SHINICHI, NAKAGAWA YUJI, MIYAMOTO KEIZO, FUJIURA HIDEAKI
Format Patent
LanguageEnglish
Published 26.09.2002
Edition7
Subjects
BASIC ELECTRIC ELEMENTS
BASIC ELECTRONIC CIRCUITRY
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
TRANSMISSION
WAVEGUIDES
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Summary:A filter unit comprises 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.
Bibliography:Application Number: US20010960964