Novel selective feeding scheme integrated with SPDT switches for a reconfigurable bandpass-to-bandstop filter

Salman Arain and Photos Vryonides and Kashif Nisar and Abdul Quddious and Symeon Nikolaou (2021) Novel selective feeding scheme integrated with SPDT switches for a reconfigurable bandpass-to-bandstop filter. IEEE Access, 9. pp. 25233-25244. ISSN 21693536

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Abstract

This paper demonstrates a new technique for designing high performance reconfigurable bandpass-to-bandstop filters by employing a ring resonator and a selective feeding scheme integrated with single-pole double-throw switches (SPDT). The transformation from bandpass-to-bandstop mode and vice-versa is achieved by connecting or disconnecting two\lambda g/4 open-circuited stubs on the ring using PIN diodes. SPDT switches are employed for electronic switching between two different feeding line sections. In the bandpass state the resonator presents two transmission zeros near the edges of the passband and four attenuation poles inside the passband, enhancing the filter's performance, thus achieving excellent sharp rejection with high roll-off-rate (ROR20dB). On the other hand, high stopband rejection with wide bandwidth, good return loss and good skirt-band attenuation rates are achieved in the bandstop state. Even-and odd-mode analysis is adopted and closed-form expressions are derived to describe the filter's behaviour. To verify the validity of the proposed design, a prototype filter was fabricated and measured. In measurement, a 65% 3-dB bandwidth bandpass filter (BPF) with an insertion loss of 0.86 dB was switched to a 70% 20-dB bandwidth bandstop filter (BSF) with more than 40 dB stopband rejection.

Item Type:	Article
Keyword:	Bandpass filter (BPF), bandstop filter (BSF), PIN diodes, ring resonator, single-pole-double-throw (SPDT)
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1-9971 Electrical engineering. Electronics. Nuclear engineering T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1-9971 Electrical engineering. Electronics. Nuclear engineering > TK5101-6720 Telecommunication Including telegraphy, telephone, radio, radar, television
Department:	FACULTY > Faculty of Computing and Informatics
Depositing User:	ABDULLAH BIN SABUDIN -
Date Deposited:	23 Aug 2023 15:26
Last Modified:	23 Aug 2023 15:26
URI:	https://eprints.ums.edu.my/id/eprint/36431

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