Title: A design of a dual-band bandpass filter based on modal analysis for modern communication systems
Authors: Lalbakhsh, Ali
Alizadeh, Seyed Morteza
Ghaderi, Amirhossein H.
Golestanifar, Alireza R.
Mohamadzade, Bahare
Jamshidi, Mohammad
Mandal, Kaushik
Mohyuddin, Wahab
Citation: LALBAKHSH, A., ALIZADEH, S. M., GHADERI, A. H., GOLESTANIFAR, A. R., MOHAMADZADE, B., JAMSHIDI, M., MANDAL, K., MOHYUDDIN, W. A design of a dual-band bandpass filter based on modal analysis for modern communication systems. Electronics, 2020, roč. 9, č. 11, s. 1-13. ISSN 2079-9292.
Issue Date: 2020
Publisher: MDPI
Document type: článek
URI: 2-s2.0-85094556900
ISSN: 2079-9292
Keywords in different language: dual-band BPF;tunable bandwidth;LC circuit;microstrip technology
Abstract in different language: A dual-band bandpass filter (BPF) composed of a coupling structure and a bent T-shaped resonator loaded by small L-shaped stubs is presented in this paper. The first band of the proposed BPF covers 4.6 to 10.6 GHz, showing 78.9% fractional bandwidth (FBW) at 7.6 GHz, and the second passband is cantered at 11.5 GHz with a FBW of 2.34%. The bent T-shaped resonator generates two transmission zeros (TZs) near the wide passband edges, which are used to tune the bandwidth of the first band, and the L-shaped stubs are used to create and control the narrow passband. The selectivity performance of the BPF is analyzed using the transfer function extracted from the lumped circuit model verified by a detailed even/odd mode analysis. The BPF presents a flat group delay (GD) of 0.45 ns and an insertion loss (IL) less than 0.6 dB in the wide passband and a 0.92 IL in the narrow passband. A prototype of the proposed BPF is fabricated and tested, showing very good agreement between the numerically predicted and measured results.
Rights: © MDPI
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