A novel miniaturized sext‐band bandstop filter based on tree‐shaped branches loaded asymmetric multimode resonators

Abstract The working mechanism of suggested tunable bandstop filtered with asymmetrical multiple‐mode resonator equipped tree‐shape branches is described in this letter. Because the established degree freedom, filters’ (BSFs) centre frequencies may be modified based on design approach. Meanwhile, BSFs have small dimensions and abrupt roll‐off skirts for transition bands. A technology demonstration filter six stopbands placed at 1.91/2.38/3.54/5.19/5.79/6.85 GHz was constructed to verify analyses. It found that measurement a consistent comparison simulation data, which indicates proposed structure an optional approach BSF design. can applied field communication, information coal mine automation.