Compact Bandpass Filters with Bandwidth Control using Defected Ground Structure (DGS)
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Compact Bandpass Filters with Bandwidth Control using Defected Ground Structure (DGS)摘要
This paper presents new compact microstrip bandpass filters with bandwidth control by employing DGS resonators. The proposed bandpass filters consists of two coupled DGS resonators with a microstrip excitation. The bandwidth can be controlled by choosing the coupling structure between the two DGS resonators. The wider bandwidth can be achieved by adding a strip conductor between the two DGS resonators. However, the narrow bandwidth can be obtained by etching a slot in the strip conductor placed between the DGS resonators. The widths of the strip conductor and the etched slot control the filter bandwidth. Fractional bandwidth (FBW) from about 2.5% or less to more than 22% can be achieved by this design approach. The concept has been validated through the design and implementation of two filters with FBW of 6% and 12.9%. Measurements agree well with theoretical results.
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S=0.5mm
d=0mm
S=0.5mm,
d=0.1mm
Simulated 12.5 % 6 %
Measured 13 % 6.5 %
Simulated fo 1.61 GHz 1.67 GHz
Measured fo 1.63 GHz 1.67 GHz
Simulated
Insertion 1.0 dB 2.3 dB
Measured
Insertion
46 dB 2.1 dB
REHMAN, SHETA, ALKANHAL: COMPACT BANDPASS FILTERS WITH BANDWIDTH CONTROL USING DEFECTED GROUND STRUCTURE 629
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