A New Varactor-Tuned 5.8 GHz Dielectric Resonator Band-Stop Filter for ITS and C-V2X Coexistence with Vehicular DSRC

In this paper, we introduce an electronically tuneable band-stop filter based on a dielectric resonator, along with its design principles and equivalent circuit model aimed at the coexistence of intelligent transport systems (ITS) cellular vehicle-to-everything (C-V2X) communications operating 5.9 GHz, widely spread vehicular dedicated short range (DSRC) 5.8 GHz. The proposed architecture involves resonator coupled via microstrip transmission line to planar ring resonator. resonance is tuned by varying bias voltage varactor diode placed in ring. This analyzed theoretically experimentally. For validation, GHz was designed. prototype capable enhancing exhibiting features. First, when inserted into ITS transmitter chain, it reduces unwanted emissions out-of-band spectrum occupied DSRC carriers frequency band least 25 dB, minimal insertion loss 5. 9 1.6 dB; secondly, receiver exhibits high linearity that prevents generation intermodulation products falling pass band. features more than 21 dBm third-order input intercept points, tuning 26 MHz while maintaining loaded Q factor 93. discussed regarding detailed parameter extraction their dependency upon control voltage.