Tunable Microwave Bandstop Filter for Sub-6 GHz 5G Applications

This work reports design and implementation of three pole tuned BSF for sub 6 GHz applications. Based on coupled resonator theory systematic design of tuned filter using square slotted ground resonator is studied and implemented to achieve the desired FBW nearly 26% is achieved with desired stop band Isolation of 30 dB. Elliptical model-based structure improves the tunability thus improving the controllability. The 3-pole tuned BSF designed and implemented for higher sub 6 GHz and lower 3 GHz applications yield compact and scalable BSFs supporting wireless systems by integrating with 5G antenna units thus leading to miniature RF system development.