Koch Fractal Shape Microstrip Bandpass Filters on High Resistivity Silicon for the Suppression of the 2nd Harmonic

  • Kim, Ii-Kwon (School of Electrical and Computer Engineering, Georgia Institute of Technology) ;
  • Kingsley Nickolas (School of Electrical and Computer Engineering, Georgia Institute of Technology) ;
  • Morton Matthew A. (School of Electrical and Computer Engineering, Georgia Institute of Technology) ;
  • Pinel Stephane (School of Electrical and Computer Engineering, Georgia Institute of Technology) ;
  • Papapolymerou John (School of Electrical and Computer Engineering, Georgia Institute of Technology) ;
  • Tentzeris Manos M. (School of Electrical and Computer Engineering, Georgia Institute of Technology) ;
  • Laskar Joy (School of Electrical and Computer Engineering, Georgia Institute of Technology) ;
  • Yook, Jong-Gwan (Department of Electric and Electronics Engineering, Yonsei University)
  • Published : 2006.12.31

Abstract

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.

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