Notch filter system and method

Details Notch filter system and method Notch filter system and method

2006-08-15

2006-08-15

Jones, Stephen E. (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Nonreciprocal gyromagnetic type

C333S202000

Reexamination Certificate

active

07091798

ABSTRACT:
A circulator is used as a notch filter having a notch at a notch frequency band outside its frequency band of operation as a circulator. It has been observed that circulators operate as a notch filter at a relatively narrow band of operation outside its typical band of operation as a circulator. In certain embodiments, the circulator operates as a narrowband notch filter with sharp edges. Such a notch filter can be used between frequency bands carrying communications signals to reduce energy from one frequency band from spilling into a different frequency band. Since the notch has been observed to be relatively narrow and deep with sharp edges, such a notch filter can be used to reduce the guard bands between frequency bands, thereby increasing the amount of bandwidth that can de used to transmit communications signals. Furthermore, since a typical ferrite circulator is a relatively low cost component, the resulting notch filter can also be of low cost.

REFERENCES:
patent: 5129099 (1992-07-01), Roberts
patent: 5721521 (1998-02-01), Drabeck et al.
patent: 6374094 (2002-04-01), Zappala

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