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Investigation of novel tapered hybrid defected ground structure (DGS)
Author(s) -
Mollah Mohammad Nurunnabi,
Karmakar Nemai Chandra,
Fu Jeffrey S.
Publication year - 2005
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20098
Subject(s) - passband , chebyshev filter , bandwidth (computing) , microstrip , microwave , return loss , electronic engineering , stopband , insertion loss , computer science , materials science , optoelectronics , topology (electrical circuits) , physics , electrical engineering , band pass filter , telecommunications , engineering , antenna (radio)
Novel defected ground structures (DGSs) have been investigated to achieve improved low‐pass filter (LPF) properties. A chronological development in designs ranging from conventional square‐patterned photonic‐bandgap structure (PBGS) and conventional dumbbell‐shaped DGS to proposed novel nonuniform DGS has been investigated theoretically and experimentally using computer‐aided design (CAD) tools. It can be seen that the proposed novel DGS having Chebyshev distribution provides excellent performances in terms of ripples in the passband, 10‐dB return‐loss bandwidth (RL‐BW), and 20‐dB rejection bandwidth, as compared to conventional DGSs and PBGSs. Thus, a perturbed surface below a standard 50Ω microstrip transmission line provides LPF characteristics. © 2005 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005.