BAND-PASS FILTER AND METHOD FOR DESIGNING THE SAME

PROBLEM TO BE SOLVED: To provide a method for designing a band-pass filter in which transmission characteristics can be improved in a required signal band at a low cost while sustaining required out-band attenuation characteristics without increasing the overall dimensions, and to provide the band-p...

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Hauptverfasser:	KUSHIRO YUICHIRO, HATANAKA HIROSHI, NOMOTO TOSHIHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS BASIC ELECTRONIC CIRCUITRY ELECTRICITY IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS RESONATORS RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE WAVEGUIDES
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for designing a band-pass filter in which transmission characteristics can be improved in a required signal band at a low cost while sustaining required out-band attenuation characteristics without increasing the overall dimensions, and to provide the band-pass filter. SOLUTION: In the band-pass filter 1 comprising a plurality of resonators 3, distribution of the no-load Q value of each resonator 3 is set depending on the relative electric field strength thereof. More specifically, in a six stage elliptic function filter, amplitude deviation in the band is minimized when the no-load Q value of a first resonator 31and a sixth resonator 36is set at 3,000, and the no-load Q value of a third resonator 33and a fourth resonator 34is set at 7,000. COPYRIGHT: (C)2008,JPO&INPIT