A Five-port Integrated Planar Ultra Wideband and Narrowband Antennas System Using Excitation Switching Reconfigurable Technique for Cognitive Radio Applications

Abstract

This work presents an integrated planar five-element antennas system for cognitive radio (CR) applications. The proposed system is composed a ultra-wideband (UWB) antenna for sensing the radio spectrum and four different narrowband (NB) antennas for conducting the communication tasks. The overall antenna system is printed on FR-4 substrate of 50 mm × 50 mm × 1.6 mm dimension. The UWB antenna-coupled at port 5 (P5) is designed for sensing the 3.1 GHz to 10.6 GHz un-licensed UWB band. The first NB antenna attached to port 1(P1) covers 5 GHz to 11.4 GHz wideband frequency, whereas the paired NB antennas located at port 2 and port 3 (P2 & P3) consists of two similar antennas to achieve MIMO operation and provides 3.05 GHz to 3.75 GHz and 4.9 GHz to 6.1 GHz dual-band operation.The last NB antenna accessible at port 4 (P4) operates in dual-band frequencies of 3.7 GHz to 4.92 GHz and 8.3 GHz to 11.3 GHz. These attained resonant bands cover applications, notably Wi-MAX 3.5 GHz, Upper WLAN, sub 6 GHz 5G, and X-bands in the full UWB spectrum.The minimum isolation among all UWB and NB antennas is 16 dB over the working bands. The MIMO performances of the port 2 and port 3 antenna pairs have been computed considering the envelope correlation coefficient and mean effective gain, and found within their practical limits. The measured results are validated and show a good matching with the simulated ones.The low profile and planar features of the suggested antenna make it a possible choice to be assimilated within small wireless devices applicable in CR communication.

A Compact Isolated CR Antenna System for Application in C-Band

“…Table 2 represents the comparative study between recently reported multi-port antennas with diferent functionalities [46][47][48][49][50][51]. For a fair comparison, here, CR antennas with similar objectives are considered.…”