Two-Cascade Modal Filters Based on Modified Microstrip Lines with Grounded Conductors at the Ends

In this paper, two-cascade connections of three modal filters (MFs) were investigated based on modifiedmicrostrip lines (MSLs) with conductors grounded at the ends. It is an MSL with grounded conductors: one top, twosymmetrical top, and two side conductors. The study included simulations in the TUSUR.EMC (TALGAT) softwarebased on transmission line analysis and experimental validation using a P4M-18 MICRAN vector network analyzer.The results demonstrated that, due to a two-cascade connection, all three MFs can attenuate the ultrashort pulse(USP) impact by four times by decomposing it into four pulses with small amplitudes. By contrast, a one-cascadeconnection allows for the pulse attenuation by two times by decomposing the USP into two pulses. Meanwhile,the cross-section parameters and total length can be the same for both one-cascade and two-cascade MFs. Thus,modification by cascade connection can cost-effectively improve the protective properties of MFs against USPs.Cite this article as: I. Y. Sagiyeva, T. R. Gazizov and Y. S. Zhechev, "Two-cascade modal filters based on modified microstrip lines with grounded conductors at theends," Electrica, 25, 0149, 2025. doi: 10.5152/electrica.2025.24149.