Microstrip dual-band bandstop filter of defected ground structure and stepped impedance resonators |
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| Authors: | Wenquan Che Wenjie Feng Kuan Deng |
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| Affiliation: | 1. Department of Communication Engineering , Nanjing University of Science and Technology , 210094, Nanjing, China yeeren_che@yahoo.com.cn;3. Department of Communication Engineering , Nanjing University of Science and Technology , 210094, Nanjing, China |
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| Abstract: | This article presents a compact microstrip dual-band bandstop filter (BSF), in which one λg/4 defected ground structure (DGS) pair is utilised to realise one stopband while two stepped impedance resonators (SIRs) help obtain another stopband and suppress the spurious harmonics. The design strategies and the equivalent circuits are introduced in detail. The measured results indicate 43.8% and 18.7% fractional bandwidth in the two stopbands (2.4 GHZ and 5.2 GHz) respectively, and the return loss is greater than 15 dB in the whole passband. In addition, size reduction can be conveniently achieved by adjusting the length of the SIRs and DGS. |
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| Keywords: | microstrip bandstop filter (BSF) defected ground structure (DGS) fractional bandwidth stepped impedance resonators (SIRs) |
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