Parametric Optimization of Modal Filters with a Circular Cross Section in the Real Geometric and Electrophysical Parameters

Abstract

The paper presents the study of a novel modal filter configurations. Modal filters (MF) with a circular cross section are simulated and optimized in the real geometric and electrophysical parameters. A wide range of geometric variations of such MFs are considered, in particular, 8 structures (2-and 3-conductor MFs). In four structures, the reference conductor is made as a central conductor, and in the other four – in the form of a protective shield. The parametric optimization is performed by heuristic search by amplitude and time criteria. The amplitude criterion is important for minimizing the voltage amplitude at the output of the MF. Time criteria are necessary to provide the best conditions for the complete decomposition of the exciting pulse. As a result of optimization, a complete decomposition of the exciting pulse was achieved in almost all MFs. The peak attenuation was 3.2 times (for MF 6 in lossless simulations) and 12.4 times (for MF 5 and MF 6 in simulations with losses) while maintaining the matching of the MFs with the path. Based on the results of the study, promising MFs with a circular cross section were identified for further experimental study, and further directions of these studies were outlined.