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Presentation
Second harmonic reduction of miniaturized dual-mode microstrip band pass filters using fractal shaped open stub resonators
Progress In Electromagnetics Research Symposium, Kuala Lumpur, Malaysia (2012)
  • Jawad K. Ali, Department of Electrical Engineering, University of Technology, Iraq
  • Hussam Alsaedi, Department of Electrical Engineering, University of Technology, Iraq
Abstract
Higher harmonics normally accompany the performance of bandpass filters; and
the miniaturized microstrip dual mode bandpass filters are not an exception. The use of the
conventional open stub resonator to reduce such harmonics is not a practical solution since it
has a length of a quarter the guided wavelength at the harmonic frequency. This will make the
miniaturized filterlarger. In this paper, the use of a fractal based open stub, with high space ¯lling
property, has been investigated as a more practical solution of the 2nd harmonic reduction of the
miniaturized dual mode bandpass filters. The proposed stub has the Peano fractal shape geometry
which is characterized by its high space-filling property. The Peano based stub has been applied
to many miniaturized filterreported in the literature. Modeling and performance evaluation
of the presented filters have been carried out using a full-wave electromagnetic EM simulator,
from Sonnet Software Inc. Simulation results show that the introduction of the proposed stub
maintains the physical size of the filter under test and improves the ¯lter performance by reducing
the harmonics to satisfactory levels. This might presents a solution for second harmonic reduction
of a wide variety of miniaturized dual mode bandpass filters with different miniaturization levels.
Publication Date
March 27, 2012
Citation Information
Jawad K. Ali and Hussam Alsaedi. "Second harmonic reduction of miniaturized dual-mode microstrip band pass filters using fractal shaped open stub resonators" Progress In Electromagnetics Research Symposium, Kuala Lumpur, Malaysia (2012)
Available at: http://works.bepress.com/jawad_ali/21/