Ultra-Wideband Bandpass Filter With Improved Upper Stopband Performance Using Defected Ground Structure
- Authors
- Lee, Jae-Kwan; Kim, Young-Sik
- Issue Date
- 6월-2010
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Bandpass filter (BPF); coupled double step impedance resonator (CDSIR); defected ground structure (DGS); open loop DGS; ultra-wideband (UWB)
- Citation
- IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, v.20, no.6, pp.316 - 318
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
- Volume
- 20
- Number
- 6
- Start Page
- 316
- End Page
- 318
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/116337
- DOI
- 10.1109/LMWC.2010.2047469
- ISSN
- 1531-1309
- Abstract
- A novel ultra-wideband (UWB) bandpass filter (BPF) with improved upper stopband performance using a defected ground structure (DGS) is presented in this letter. The proposed BPF is composed of seven DGSs that are positioned under the input and output microstrip line and coupled double step impedance resonator (CDSIR). By using CDSIR and open loop defected ground structure (OLDGS), we can achieve UWB BPF characteristics, and by using the conventional CDGSs under the input and output microstrip line, we can improve the upper stopband performance. Simulated and measured results are found in good agreement with each other, showing a wide passband from 3.4 to 10.9 GHz, minimum insertion loss of 0.61 dB at 7.02 GHz, a group delay variation of less than 0.4 ns in the operating band, and a wide upper stopband with more than 30 dB attenuation up to 20 GHz. In addition, the proposed UWB BPF has a compact size (0.27 lambda(g) similar to 0.29 lambda(g), lambda(g) : guided wavelength at the central frequency of 6.85 GHz).
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