Highpass filters use modified equal-element design

  
Using a modified equal-element design for a lumped-circuit lowpass filter has several advantages over the well-known equal-element design (Reference 1 and Reference 2). The modified design exhibits superior passband performance with only modest degradation of stopband selectivity. Moreover, the modified design is simple and easy to manufacture. You can extend the modified equal-element design to highpass LC filters.
Highpass filters use modified equal-element design - schematic




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