Semi-lumped bandstop filter

Details Semi-lumped bandstop filter Semi-lumped bandstop filter

1998-06-26

2000-07-18

Bettendorf, Justin P.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333204, 333134, H03H 701

Patent

active

060913126

ABSTRACT:
The inventive bandstop filter is suitable for use in a multi-layer ceramic (MLC) structure. Specifically, the filter is a semi-lumped type, formed by lumped capacitors and distributed transmission lines. Preferably, transmission lines are used as equivalent inductors, instead of as J, K inverters or resonators. The bandstop filter preferably has attenuation poles very close to lower passband edge, which results in a very sharp rejection near the stopband. The inventive filter may be utilized as a transmitter-end filter in, e.g., duplexer applications or for miniaturized applications, such as portable communications.

REFERENCES:
patent: 2922968 (1960-01-01), Patten
patent: 4449108 (1984-05-01), Endo et al.
patent: 4586007 (1986-04-01), Ciszek
patent: 5357227 (1994-10-01), Tonegawa et al.
patent: 5834994 (1998-11-01), Shapiro

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