Bandstop filters

Details Bandstop filters Bandstop filters

H - Electricity

03

H

333/49

H03H 11/10 (2006.01) H03H 7/075 (2006.01) H03H 11/52 (2006.01)

Patent

CA 1149478

- 1 - ABSTRACT A filter network that exhibits a bandstop response comprises a network of basically low pass or high pass structure. The network is developed by choosing a bandstop transfer function, a fourth- order elliptic is disclosed, which is converted to a low pass function. This function describes a passive low pass LC ladder network including a nega- tive impedance element. A Bruton transformation is applied to the passive LC network to give an active version including an ungrounded negative resistance network in a series arm and frequency-dependent negative reistances in shunt arms without requiring inductance coils for its implementation.

346730

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