Title:
NON-REVERSIBLE CIRCUIT ELEMENT AND COMMUNICATION EQUIPMENT
Document Type and Number:
Japanese Patent JP3558003
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a non-reversible circuit element, which is miniaturized and can provide a great attenuation quantity in a prescribed frequency band without increasing costs, a non-reversible circuit constituted together with this non-reversible circuit element and communication equipment using the same.
SOLUTION: Central conductors 51, 52 and 53 are located while mutually crossing a ferrite 54, to which a DC magnetic filed is impressed, and an inductor L1 is provided on the lower surface of a capacitor C1 connected to the port part P1 of the central conductor 51. A serial resonance circuit is composed of the capacitor C1 and the inductor L1 and a trap filter is constituted with respect to a signal to be passed through an isolator. The resonance frequency of this serial resonance circuit is set to almost the double central frequency of the passing band of the element, and the double fundamental wave is attenuated. Besides, the frequency becomes a capacitive impedance in the fundamental wave frequency and is operated as a matched capacitance of the fundamental frequency by being combined with the equivalent inductance of the central conductor 51.
Inventors:
Katsuyuki Ohira
Takashi Hasegawa
Takashi Hasegawa
Application Number:
JP2000155379A
Publication Date:
August 25, 2004
Filing Date:
May 25, 2000
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
H01P1/36; H01P1/383; H01P1/387; (IPC1-7): H01P1/36; H01P1/383
Domestic Patent References:
| JP50122145A | ||||
| JP7115306A | ||||
| JP11308013A | ||||
| JP10079606A | ||||
| JP13320205A |
Attorney, Agent or Firm:
Hisao Komori
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