This letter presents a rigorous extension of the concept for the bandstop filter (BSF) with inter-resonator couplings to a higher order filter. We show that a BSF topology with inter-resonator couplings can exhibit the frequency response that a conventional BSF topology without inter-resonator couplings generates. Equivalence between the coupling matrices of the two topologies are shown. As an example, this letter shows that fourth-order BSFs with and without inter-resonator couplings can exhibit identical frequency responses.
- Bandstop filter (BSF)
- filter synthesis
- substrate integrated resonator filter
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering