Compact UWB BPF With Broad Stopband Based on Loaded-Stub and C-Shape SIDGS Resonators

In this letter, two types of substrate-integrated defected ground structure (SIDGS) resonators (i.e., loaded-stub and C-shape resonators) are proposed for the ultra-wideband (UWB) bandpass filter (BPF) design. Coupled SIDGS resonators can generate four transmission poles to achieve the UWB response...

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Published inIEEE microwave and wireless components letters Vol. 32; no. 5; pp. 383 - 386
Main Authors Xie, Jiacheng, Tang, Deshan, Shu, Yiyang, Luo, Xun
Format Journal Article
LanguageEnglish
Published IEEE 01.05.2022
Subjects
Band-pass filters
Bandpass filter (BPF)
broad stopband
Integrated circuit modeling
Load modeling
Microstrip
Passband
Resonant frequency
Resonators
substrate-integrated defected ground structure (SIDGS)
ultra-wideband (UWB)
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Abstract In this letter, two types of substrate-integrated defected ground structure (SIDGS) resonators (i.e., loaded-stub and C-shape resonators) are proposed for the ultra-wideband (UWB) bandpass filter (BPF) design. Coupled SIDGS resonators can generate four transmission poles to achieve the UWB response with low insertion loss in a compact size. Besides, the spurious cancellation with a broad stopband is achieved by mutual suppression of separated harmonics from the SIDGS resonators. In addition, the lowpass units (LPUs) embedded in the microstrip feed-lines are utilized to further improve the BPF stopband rejection. To verify the mechanism, a compact BPF operating at 6.85 GHz (i.e., the passband center frequency <inline-formula> <tex-math notation="LaTeX">f_{0} </tex-math></inline-formula>) with 0.6-dB insertion loss and 3-dB fractional bandwidth (FBW) of 114% is implemented and fabricated. The measured stopband extends to <inline-formula> <tex-math notation="LaTeX">9.7f_{0} </tex-math></inline-formula> with a rejection level more than 26 dB.
AbstractList In this letter, two types of substrate-integrated defected ground structure (SIDGS) resonators (i.e., loaded-stub and C-shape resonators) are proposed for the ultra-wideband (UWB) bandpass filter (BPF) design. Coupled SIDGS resonators can generate four transmission poles to achieve the UWB response with low insertion loss in a compact size. Besides, the spurious cancellation with a broad stopband is achieved by mutual suppression of separated harmonics from the SIDGS resonators. In addition, the lowpass units (LPUs) embedded in the microstrip feed-lines are utilized to further improve the BPF stopband rejection. To verify the mechanism, a compact BPF operating at 6.85 GHz (i.e., the passband center frequency <inline-formula> <tex-math notation="LaTeX">f_{0} </tex-math></inline-formula>) with 0.6-dB insertion loss and 3-dB fractional bandwidth (FBW) of 114% is implemented and fabricated. The measured stopband extends to <inline-formula> <tex-math notation="LaTeX">9.7f_{0} </tex-math></inline-formula> with a rejection level more than 26 dB.
Author Shu, Yiyang
Xie, Jiacheng
Tang, Deshan
Luo, Xun
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Snippet In this letter, two types of substrate-integrated defected ground structure (SIDGS) resonators (i.e., loaded-stub and C-shape resonators) are proposed for the...
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SubjectTerms Band-pass filters
Bandpass filter (BPF)
broad stopband
Integrated circuit modeling
Load modeling
Microstrip
Passband
Resonant frequency
Resonators
substrate-integrated defected ground structure (SIDGS)
ultra-wideband (UWB)
Title Compact UWB BPF With Broad Stopband Based on Loaded-Stub and C-Shape SIDGS Resonators
URI https://ieeexplore.ieee.org/document/9667270
Volume 32
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