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PIER PIER B PIER C PIER M PIER Letters
2011-09-30
Active Learning Method for the Determination of Coupling Factor and External q in Microstrip Filter Design
By
Payman Rezaee,

    Dr. Payman Rezaee

    Faculty of Electrical Engineering

    Iran University of Science and Technology (IUST)

    Iran

    Homepage

Majid Tayarani,

    Dr. Majid Tayarani

    Electrical Engineering Department

    Iran University of Science and Technology (IUST)

    Iran

    Homepage

Reinhard Knöchel

    Prof. Reinhard Knöchel

    Univ Kiel

    Germany

    Homepage

Progress In Electromagnetics Research, Vol. 120, 459-479, 2011
doi:10.2528/PIER11071901
Abstract
In the final step of any filter design process, the desired center frequency, coupling factor and external quality factor (Qext) are used to determine the physical parameters of the filter. Although in the most cases the physical dimensions of a single resonator for a given center frequency are determined using exact analytical or simple approximate equations, usually such simple equations cannot be found to easily relate the required coupling factor and Qext to the physical parameters of the filter. Analytical calculation of coupling factor and Qext versus dimensions are usually complicated due to the geometrical complexities or in some cases such as microstrip resonators due to the lack of exact solution for the field distribution. Therefore coupling factor and Qext of various kinds of resonators, especially microstrip resonators, are related to the physical parameters of the structure by the use of time consuming full wave simulations. In this paper a surprisingly fast and completely general approach based on a soft computing pattern-based processing technique, called active learning method (ALM) is proposed to overcome the time consuming process of coupling factor and Qext determination. At first the ALM technique and the steps of modeling are generally described, then as an example and in order to show the ability of the method this modeling approach is implemented to model the coupling factor and Qext surfaces of microstrip open-loop resonators versus physical parameters of the structure. Using the ALM-based extracted surfaces for coupling factor and Qext, two four pole Chebychev bandpass filters are designed and fabricated. Good agreement between the measured and simulated results validates the accuracy of the proposed approach.
Citation
Payman Rezaee, Majid Tayarani, and Reinhard Knöchel, "Active Learning Method for the Determination of Coupling Factor and External q in Microstrip Filter Design," Progress In Electromagnetics Research, Vol. 120, 459-479, 2011.
doi:10.2528/PIER11071901
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