Synthesis design of wideband bandpass filter with narrow notch band

In this article, a novel wideband bandpass filter (BPF) with narrow notch band is presented. It is composed of two sets of shunt microstrip‐to‐slotline vertical transitions, a coplanar waveguide (CPW) connecting line, and a meandering half‐wavelength slotline section. Utilizing the synthesis method...

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Bibliographic Details
Published in:Microwave and optical technology letters 2021-05, Vol.63 (5), p.1389-1393
Main Authors: Chai, Yong‐Qiang, Cheng, Chong‐Hu, Mo, Jin‐Rong, Shi, Yan‐Feng, Hu, Sheng‐Bo
Format: Article
Language:English
Subjects:
Bandpass filters
Bandwidths
Broadband
Chebyshev approximation
Chebyshev equal‐ripple response
Circuits
Coplanar waveguides
Frequency response
notch band
slotline stub
Synthesis
synthesis design
Transmission lines
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Summary:In this article, a novel wideband bandpass filter (BPF) with narrow notch band is presented. It is composed of two sets of shunt microstrip‐to‐slotline vertical transitions, a coplanar waveguide (CPW) connecting line, and a meandering half‐wavelength slotline section. Utilizing the synthesis method based on the transmission line network, a four‐pole BPF with Chebyshev equal‐ripple frequency response is realized in the desired passband. The narrow notch band with 3‐dB fractional bandwidth (FBW) of 3% at the center frequency 2.75 GHz is introduced by an embedding meandering slotline stub. To verify the theoretical prediction, the proposed BPF is fabricated and measured. The circuit model and EM simulation are consistent with theoretical calculation and test results, which sufficiently confirm the correctness and feasibility of the design method.
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.32762