| Koch Fractal Shape Microstrip Bandpass Filters on High Resistivity Silicon for the Suppression of the 2nd Harmonic |
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Ii-Kwon Kim1, Nickolas Kingsley1, Matthew A. Morton1, Stephane Pinel1, John Papapolymerou1, Manos M. Tentzeris1, Joy Laskar1, Jong-Gwan Yook2 |
1School of Electrical and Computer Engineering, Georgia Institute of Technology
2Department of Electric and Electronics Engineering, Yonsei University |
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| Abstract |
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In this paper, the fractal shape is applied to microstrip band pass filters and integrated on a high-resistivity Si substrate to solve conventional $2^{nd}$ harmonic problem. Conventional microstrip coupled line filters are popular in RF front ends, because they can be easily fabricated and integrated with other RF components. However, they typically have large second harmonics that can cause unwanted interference in interested frequency bands. Without any additional filters, the proposed Koch shape filters have suppressed the $2^{nd}$ harmonics by about -40 dB, so they can be used in systems such as direct conversion receiver with stringent harmonic suppression requirements. |
| Key words:
Koch Fractal Geometry, Space Filling Property, Microstrip Bandpass Filter, The $2^{nd}$ Harmonic Suppression, High Resistivity Silicon |
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