Abstruct -The lumped-element bridged-T notch fdterThe purpose of this paper is to extend Bode's Concept is extended to reciprocal distributed-element bridged-T notch filter concept to reciprocal circuits that fdter employing singlemode resonators is described that enhances the effective resonator Qu by a factor of 325, while ,a different microstrip fdter topology with a Mple-mode bdance and phase cancellation [61 can take the place of resonator is described that enhances the effective resonator Bode's impedance balance concept. The result is Qu by a factor of 89. The new notch filters can be either essentially the passive enhancement of resonator effective partly reflective or fully absorptive within the stopband.
Q~ ( Q , ,~~) ) .
A microstrip bridged-T topology is used toAdditional enhanced+, notch fdter topologies, such as a notch mter, that include at least two illustrate how one can obtain quasi-infinite attenuation at resonances and at least two signal paths are suggested.single frequencies using passive lossy distributed components. Also, it is shown that the technique can be generalized to other topologies that include at least two resonances and at least two signal paths.fflters. A prototype microship bfidged-T notch include distributed elements. It is demonstrated that, for distributed element circuits, the concepts of attenuation
Normal realizations of bandstop resonators with finite unloaded Q suffer from degradation of performance due dissipation loss. In this paper it is shown theoretically that there exists a class of second-order networks which simultaneously exhibit an ideal bandstop resonance, with infinite stopband attenuation, and a perfect match at all frequencies. Theoretical analysis is backed up with experimental results for three different physical realizations.
A frequency-agile bandstop filter technology with tunable stopband attenuation and constant absolute bandwidth is described. The technology is demonstrated by a six-resonator planar microstrip filter with simultaneous varactor-diode tuning of stopband attenuation from 30dB to 50dB and of operating frequency from 1.8 GHz to 2.2 GHz, with a stopband bandwidth of 60 MHz and absolute 3dB bandwidth of less than 390 MHz.
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