Compact microstrip band-pass filter for EMI reduction
A compact microstrip band-pass filter design using parallel coupled lines is presented in this work. The parallel coupled resonator's dimensions are calculated theoretically and the equivalent circuit is analyzed. The frequency response is then approximated using CST software. The filter is int...
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| Main Author: | |
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| Format: | Thesis |
| Published: |
2014
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/6719/ http://eprints.uthm.edu.my/6719/1/hussein_mohamed_hagihassan.pdf |
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| Summary: | A compact microstrip band-pass filter design using parallel coupled lines is
presented in this work. The parallel coupled resonator's dimensions are calculated
theoretically and the equivalent circuit is analyzed. The frequency response is then
approximated using CST software. The filter is integrated with Defected Ground
Structure (DGS) to alter current distribution over the ground plane and hence changing
the resonance properties of the filter's element.
The proposed structure offers a simple and compact design while exhibiting wide
stop-band characteristics in comparison with conventional coupled microstrip line filter
design. The fabrication and measurements of 2GHz prototype DGS integrated parallelcoupled
bandpass filter are presented.
The measured results agree well with the simulations and calculations data. The
introduction of DGS suppresses the second, third and fourth harmonic responses
enhancing the stop band criteria. In addition, the DGS causes resonance frequency shift
on some resonator elements, miniaturizing the length and make the overall size 20.8%
more compact compared to the conventional ones. |
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