Document Type and Number:
Japanese Patent JPH0334684
Kind Code:
B2
Abstract:
PURPOSE:To realize desired characteristics by providing a tap to an inductor of one set of parallel resonance circuit inserted in series with an input/output terminal in an FM radio receiver and adopting simple circuit constitution where a capacitor is connected between the tap and ground to produce an attenuating poles at high frequencies. CONSTITUTION:The circuit is constituted by selecting values of an inductor L2 and capacitors C2, C4 so that the tap 5 is provided to the inductor L2 of the 2nd parallel resonance circuit inserted in series with the input/output terminal 1, the capacitor C4 is added between the tap 5 and ground 2, the 1st attenuation pole is produced in a frequency range of nearly 1.2 time to 1.6 time of the high frequency cut-off frequency f2 of pass band and the 2nd attenuation pole is produced in the frequency range of nearly 1.9 time to 3 times of the cut-off frequency f2, and the frequency band between the 1st attenuation pole and the 2nd attenuation pole is used as the pass band. The figure shows the circuit constituted by printing a circuit pattern comprising an inductor and capacitor to both sides of a dielectric board 8.
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Inventors:
KAWAGUCHI CHIHIRO
ONIZUKA AKIRA
ONIZUKA AKIRA
Application Number:
JP14272484A
Publication Date:
May 23, 1991
Filing Date:
July 10, 1984
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H03H7/01; H01F17/04; H01F27/00; H01G4/40; H03H1/00; H03H7/07
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