Synthesis and Design of Highly Selective Multi-Mode Dual-Band Bandstop Filter

FAISAL, MUHAMMAD and KHALID, SOHAIL and REHMAN, , MUJEEB UR and REHMAN, MUHAMMAD ABDUL Synthesis and Design of Highly Selective Multi-Mode Dual-Band Bandstop Filter. IEEE ACCESS.

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Abstract

This paper presents the synthesis and design of the multi-mode dual-band bandstop filter
(MM-DBBSF). A highly selective multi-mode dual-band bandstop response is obtained using a quarter wavelength coupled line structure. It has been shown that by increasing the coupled line’s order,
the selectivity and the transmission zeros are increased in the desired stopband. Moreover, a step impedance
resonator (SIR) is used between two coupled lines to achieve more transmission poles for better out-of-band
selectivity. The paper show a detailed theoretical synthesis of the coupled line and SIR structure. In order
to validate the theoretical model, ideal and microstrip topologies are designed and simulated. Furthermore,
a high-frequency substrate is used to fabricate four prototypes. The simulated and measured results show
good concurrence.

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