Title
Compact 1.75–2.7 GHz Tunable BPF With Wide Stopband Up to 9.5 GHz Using Harmonic-Controlled SIDGS Resonators
Abstract
In this brief, a harmonic-controlled substrate-integrated defected ground structure (SIDGS) resonator with tuning capacitor is proposed for the design of tunable filter. Such resonator exhibits a harmonic-controlled characteristic. The fundamental resonant frequency can be properly tuned, while the spurious resonance is controlled at much higher frequency to achieve a wide stopband. To verify the principle, a tunable bandpass filter (BPF) is designed and fabricated based on the resonator. The center frequency can be tuned from 1.75 to 2.7 GHz. Meanwhile, the stopband can extend up to 9.5 GHz with a rejection level of 20 dB for all tuning cases. The BPF also exhibits low insertion loss (i.e., 1.1–1.9 dB) and compact size (i.e., 0.07 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${\lambda _{g}}\,\,{\times }\,\,0.08\,\,{\lambda _{g}}$ </tex-math></inline-formula> , where <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${\lambda _{g}}$ </tex-math></inline-formula> is the microstrip guided wavelength at the 1.75 GHz).
Year
DOI
Venue
2022
10.1109/TCSII.2022.3185805
IEEE Transactions on Circuits and Systems II: Express Briefs
Keywords
DocType
Volume
Harmonic-controlled,substrate-integrated defected ground structure (SIDGS),tunable bandpass filter (BPF),wide stopband
Journal
69
Issue
ISSN
Citations 
11
1549-7747
0
PageRank 
References 
Authors
0.34
8
4
Name
Order
Citations
PageRank
Deshan Tang100.68
Huizhen Jenny Qian200.68
Yuandan Dong384.36
Xun Luo41410.67