A Novel Artificial Defected Ground Structure (DGS) for RF Filter Design in Package
Date Issued
2010
Date
2010
Author(s)
Hsu, Yu-Hao
Abstract
A novel defected ground structure (DGS) in a multilayer stack-up is proposed. This structure is a defected ground plane with mushroom structures (DGMS). The proposed structure provides a relatively compact size and low radiation and is suitable for multilayer applications. A design method using a transmission line model is introduced to predict the physical size of a DGS-type resonator. In this model, the short-end effect is considered to modify the theoretical calculation. Band-stop filters and coupled-resonator band-pass filters are fabricated with DGS-type resonators in a multilayer structure. There are two kinds of band-stop filter with rectangular- and dumbbell-shape DGS-type resonators. Compared with the conventional DGS, the band-stop filter with DGMS can reduce about 21.2% and 28.7% for band-stop filter with rectangular- and dumbbell-shape DGS-type resonators. For coupled-resonator band-pass filters, the size reduction of DGMS resonators is about 46.8% and the total size reduction of the band-pass filter is about 29.7% in contrast with the conventional DGS. The radiation can be reduced about 5dB and 10 dB for the band-stop filter and the band-pass filter. The proposed structure with miniature size and low radiation is suitable for multilayer applications.
Subjects
defected ground structure (DGS)
mushroom
miniaturization
size reduction
Electromagnetic interference (EMI)
multilayer.
Type
thesis
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