Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Reexamination Certificate
2008-01-29
2008-01-29
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
C333S110000, C333S126000, C333S132000, C333S174000, C327S556000
Reexamination Certificate
active
11145219
ABSTRACT:
An absorptive bandstop filter includes at least two frequency-dependent networks, one of which constitutes a bandpass filter, that form at least two forward signal paths between an input port and an output port and whose transmission magnitude and phase characteristics are selected to provide a relative stopband bandwidth that is substantially independent of the maximum attenuation within the stopband and/or in which the maximum attenuation within the stopband is substantially independent of the unloaded quality factor of the resonators. The constituent network characteristics can also be selected to provide low reflection in the stopband as well as in the passband. The absorptive bandstop filter can be electrically tunable and can substantially maintain its attenuation characteristics over a broad frequency tuning range.
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Glenn Kimberly E
Karasek John J.
Legg L. George
Pascal Robert
The United States of America as represented by the Secretary of
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