Superdirective and Broadband Compact Antenna Array Using Non-Foster Elements

Abstract

Performance characteristics of passive electrically small antennas are limited by fundamental physics. Using active elements into antenna structures appears like an opportunity to overshoot those limits. Non-Foster elements are classically used in matching networks for electrically small antennas in order to increase their impedance matching bandwidth. In this paper, Non-Foster elements are proposed as innovative method to achieve a broadband high directive and compact two-dipole array at 1.2 GHz. This implementation achieves a high directivity within 20% bandwidth.