Active learning method for microstrip filter design

The Ink Drop spread (IDS) technique which has been proposed as a modeling technique for the active learning method (ALM) shows its advantage in real time capability, tractability, interpretability, robustness and speed. Use of pattern based processing instead of complex formulas make this method a good candidate for modeling complicated electromagnetic problems with no analytical solution. This paper proposes the use of ALM with IDS engine in computation of coupling factor between microstrip open loop resonators in a vanishingly short time instead of the conventional time consuming full wave simulation approach. Using IDS based extracted coupling surfaces in the case of two kinds of open loop resonators, the square open loop resonator (SOLR) and the triangular open loop resonator (TOLR), two Chebychev bandpass filters were designed and fabricated. A very good agreement between the desired characteristics of the filter and the fabricated responses shows the accuracy of the proposed approach.