Demonstration on performance characteristics of microstrip low-pass filter for various substrates employing Tschebycheff distribution

Abstract

In modern microwave design sector, Electromagnetic Band Gap (EBG) structures which is a unique innovation by virtue of their high potency and low complexity in designing with integrated circuits. This article examines the relationship between operating performance of different substrates and Tschebycheff polynomial distribution. A number of methods, method of moments (MOM) for numerical analysis and Tschebycheff polynomial distribution for designing the traditional circular pattern on ground plane are used. In like manner, the parametric comparison has been demonstrated in view of the selectivity, 20-dB insertion loss bandwidth (20-dB IL BW) and 10-dB return loss bandwidth (10-dB RL BW). The consequence of that is, two substrates FR4 and RT/Duroid 5870 prevail with good matching upto 70 dB, negligible ripple less than 0.7 dB in the passband and wider, deeper stopband performance upto 6-7.5 GHz. Improving compactness of the circuit with high efficiency, this complication is solved by Tschebycheff polynomial distribution.