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

Design of Multi-Band Bandstop Filters Based on Mixed Electric and Magnetic Coupling Resonators

“…Therefore, the stopbands of the current multi-band bandstop filters are mainly concentrated in the dual bands. In [4][5][6][7][8][9][10][11][12][13][14], different techniques are presented to achieve the multi-band bandstop frequency response. For example, in [4][5][6][7][8][9], various researchers used different methods to implement dual-band BSFs.…”