Design of compact superdirective and reconfigurable array antenna associated with Non-Foster elements for IoT

Electrically small or compact antennas are limited by the physical fundamental laws. Introducing elements assets within an antenna structure can be an opportunity to overcome these limitations. Non-Foster elements are generally used to improve impedance matching of miniature antennas. In this paper, the Non-Foster elements are proposed as an innovative method to build up highly directive array antenna. This paper presents a design methodology for super-directive antenna arrays, centred at 868 MHz using two dipoles associated with Non-Foster elements.