Design of Compact Microstrip Sept-Band Bandpass Filter With Flexible Passband Allocation

A compact sept-band bandpass filter (BPF) with flexible passband allocation has been presented. By introducing the multiple coupling paths, all passbands can be fully controlled and designed independently. The first and last resonators are used to not only create one of the passbands but also serve...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2016-05, Vol.26 (5), p.346-348
Main Authors: Chen, Chi-Feng, Chang, Sheng-Fa, Tseng, Bo-Hao
Format: Article
Language:English
Subjects:
Accuracy
Allocations
Band-pass filters
Bandpass filter (BPF)
Bandpass filters
Circuits
Coupling
Couplings
Microstrip
Microwaves
Passband
Resonant frequency
Resonators
Resource management
sept-band
Simulation
stub-loaded resonator
transmission zero
Wireless communication
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Summary:A compact sept-band bandpass filter (BPF) with flexible passband allocation has been presented. By introducing the multiple coupling paths, all passbands can be fully controlled and designed independently. The first and last resonators are used to not only create one of the passbands but also serve as the input and output coupling structure for the other passbands. Thus, more operating bands can be obtained without increasing extra circuit area. The special arrangement of resonators could help to reduce the filter size and create more operating bands. For demonstration, a two-pole sept-band BPF centering at 1.05, 1.3, 1.5, 1.8, 2.05, 2.35, and 2.85 GHz has been designed and fabricated with microstrip technology. The sept-band BPF has an extremely small size of 0.14 λ g by 0.19 λ g . Moreover, good agreement is achieved between simulation and measurement.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2016.2549023