Multifunctional Switchable Filter Using Coupled-Line Structure

A compact multifunctional switchable filter based on parallel-coupled lines with three different filtering functions is presented in this letter. By using p-i-n switches to connect or disconnect microstrip line and shorted coupled lines, three different modes, i.e., wideband bandpass filter (BPF), b...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2021-05, Vol.31 (5), p.457-460
Main Authors: Li, Donghao, Xu, Kai-Da
Format: Article
Language:English
Subjects:
Band-pass filters
Bandpass filter (BPF)
Bandpass filters
bandstop filter (BSF)
Bandstop filters
Bandwidths
Broadband
Coupled modes
Dual band
dual-band filter
Insertion loss
Microstrip
Microstrip transmission lines
Microwave filters
parallel-coupled lines
Resonator filters
switchable filter
Switches
Switching circuits
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Summary:A compact multifunctional switchable filter based on parallel-coupled lines with three different filtering functions is presented in this letter. By using p-i-n switches to connect or disconnect microstrip line and shorted coupled lines, three different modes, i.e., wideband bandpass filter (BPF), bandstop filter (BSF), and dual-band BPF, can be realized. For demonstration, the switchable filter prototype is designed and fabricated. For the wideband BPF mode, the measured 3-dB fractional bandwidth is about 53.1% (1.41-2.43 GHz) with the measured insertion loss of 0.9 dB. For the BSF mode, the measured 10-dB fractional bandwidth is about 30.2% (1.63-2.21 GHz) with in-band suppression level of over 15.5 dB. For the dual-band BPF mode, the measured 3-dB bandwidths of the two passbands are around 3.8% and 2.7%, respectively.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2021.3067893