Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1997-09-02
1999-03-16
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333175, 455209, 455323, H03H 700, H04B 116
Patent
active
058835539
ABSTRACT:
In a filter unit having a first and a second bandpass filter (21 and 22) and an input terminal (101) supplied with a unit input signal, the first bandpass filter has a first filtering bandwidth with a first center frequency while a second bandpass filter having a second filtering bandwidth with a second center frequency. Only when the unit input signal has a bandwidth similar to the first filtering bandwidth, a first impedance-adjusting arrangement (11 and 31) matches a first impedance of a combination of the first bandpass filter and the first impedance-adjusting arrangement with an output impedance of an input side component. Only when the unit input signal has a bandwidth similar to the second filtering bandwidth, a second impedance-adjusting arrangement (12 and 32) matches a second impedance of a combination of the second bandpass filter and the second impedance-adjusting arrangement with the output impedance of the input side component.
REFERENCES:
patent: 5390346 (1995-02-01), Marz
patent: 5561406 (1996-10-01), Ikata et al.
Ham Seungsook
NEC Corporation
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