A Compact Multiport Sensing and Communicating Antenna System for Cognitive Radio Applications

Abstract

Efficient utilization of unlicensed radio spectrum is a significant concern in wireless communication. This manuscript proposes an antenna structure system to support secondary user (SU) functionality. The design integrates a sensing UWB antenna (3.1–11) GHz to monitor spectrum utilization by primary users (PU) and four narrow-band (NB) communication antennas, resonating at (9.66, 9.03, 5.72, 7.78, and 10.21) GHz with 75.30 % UWB spectrum utilization. The configuration supports up to four simultaneous communications with acceptable gain & isolation, validated using Ansys-HFSS and experimental results, highlighting its potential for trustworthy Cognitive Radio applications.