Compact multiband sensing MIMO antenna array for cognitive radio system

This paper presents a new design for a multiband sensing MIMO antenna system that can be used in cognitive radio communication for a mobile platform. The antenna system consists of two identical small-size multiband antennas with dimensions 29.5 × 17 × 5 mm3 and each of them is comprised of a driven strip monopole and a coupled parasitic shorted strip. These antennas are located diagonally to limit the mutual coupling and antenna correlation at low frequencies. The obtained operating bands are 698-990 MHz and 1710-5530 MHz, which include most of the LTE and Wi-Fi frequency bands. A prototype was fabricated and the measured results indicate that the realized efficiency is acceptable for a mobile application considering the compact size.