A Novel Design of Multifunctional Compact Four-Port Antennas System for Cognitive Radio Applications

Abstract

The paper proposes a hybrid, compact, low profile, multi-port antenna system for Cognitive Radio (CR). It consists of three different shaped NB antennas and a Funnel-shaped UWB monopole antenna which is operating between 1.8 and 14.2 GHz. The objective of this article is to design and discuss a four-port antennas system for cognitive radio application. This antenna system consists with one ultra-wide band antenna (UWB) and three different shaped narrow band (NB) antennas. The compact size of this antenna system is 0.18λ_L×0.30λ_L, where λ_L corresponds to the wavelength at lowest operational frequency. In this antenna system one ultrawide band (UWB) antenna is used for sensing the frequency spectrum and three narrow band antennas are employed for communication purpose. The ultra-wideband antenna sense 1.8 GHz - 14.2 GHz spectrum which cover the ultrawide band frequency range from 3.1 GHz - 10.6 GHz, which is permitted by Federal Communication Commission in year 2002. CST Microwave Studio is used to simulate the system, and a prototype is built to confirm the outcomes. The observed and simulated results accord rather well. The suggested antenna may be used for public safety wireless communication, marine radio navigation, X-band satellite communication, mid-band 5G, ISM/WLAN/Military applications, and C-band operations.