en برق خودرو Automotive electrical systems پژوهشي Research Automotive radar systems operating in the 24 GHz band are widely used in Advanced Driver Assistance Systems (ADAS) due to their cost-effectiveness and robust performance across diverse environmental conditions. However, these systems face critical vulnerabilities from electromagnetic interference (EMI) and high-power microwave (HPM) threats, which can degrade detection accuracy. This study presents a novel plasma-based limiter employing a Gas Discharge Tube (GDT) within an optimized K-band waveguide (10.668 × 4.318 mm) filled with Rogers RO3035 dielectric (εr = 3.6). The design achieves exceptional metrics: 0.9 dB insertion loss and 21.5 dB return loss during normal operation, while providing over 30 dB isolation against HPM signals with a sub-100 ns response time. These characteristics position this solution as an industry-leading protection mechanism for next-generation automotive radars.  Plasma, limiter, 24 GHz radar, EMI protection, Automotive safety, GDT technology 4811 4817 http://ase.iust.ac.ir/browse.php?a_code=A-10-738-2&slc_lang=en&sid=1 Hamed Taghi zadeh Taghizadeh.hamed@gmail.com 180031947532846005099 180031947532846005099 No Malek Ashtar University of Technology Ali Jabbar Rashidi aiorashid@yahoo.com 180031947532846005100 180031947532846005100 Yes Malek Ashtar University of Technology Mohammad Mahdi Taskhiri taskhiri@qut.ac.ir 180031947532846005101 180031947532846005101 No Qom University of Technology