High-Selectivity Lowpass-Bandpass Filters With Flexible Passband Allocation

This letter presents a dual-band lowpass-bandpass filter utilizing dual-mode unit cells. The first mode can be tuned without affecting the second mode. The I/O coupled lines for the bandpass response introduce a transmission zero (TZ) to improve the selectivity of the lowpass response. Indeed, the d...

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Bibliographic Details
Published in:IEEE microwave and wireless technology letters (Print) 2023-07, Vol.33 (7), p.1-4
Main Authors: Yuan, Yuefeng, Xie, Wei, Dai, Jinhao, Zhang, Chi, Jiang, Runbo, Wang, Jia, Li, Chunguang, Wu, Yun, Wang, Xu, Sun, Liang
Format: Article
Language:English
Subjects:
Band-pass filters
Bandpass filters
Bandwidth
Bandwidths
Coupled modes
Dual-band
flexible allocation
Frequency measurement
independent modes
lowpass–bandpass
Microwave filters
Passband
Resonator filters
Resonators
Unit cell
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Summary:This letter presents a dual-band lowpass-bandpass filter utilizing dual-mode unit cells. The first mode can be tuned without affecting the second mode. The I/O coupled lines for the bandpass response introduce a transmission zero (TZ) to improve the selectivity of the lowpass response. Indeed, the developed improved unit cell provides a frequency ratio ranging from 1 to 4 and a fractional bandwidth of up to 60%. Additionally, a seven-section lowpass-bandpass filter is designed and fabricated, affording a flexible passband allocation, where the lowpass response's cutoff frequency and roll-off rate are 0.917 GHz and 1055 dB/GHz, respectively. The center frequency and fractional bandwidth of the bandpass response are 1.718 GHz and 13%, respectively, and the filter measures only 0.139 \lambda _{g} \times 0.046 \lambda_{g}.
ISSN:2771-957X
2771-9588
DOI:10.1109/LMWT.2023.3261106