In this contribution, we propose the use of Non-Foster circuit to dramatically improve the bandwidth of operation of enhanced transmission devices based on the employment of Split-Ring Resonators (SRRs). The idea behind the proposed solution is to compensate the intrinsic reactance of the SRR through a proper non-Foster active load placed across its external gap. The stability analysis and an ideal load circuit working at Very High Frequency (VHF) band are developed and presented.
Monti, A., Barbuto, M., Toscano, A., Bilotti, F. (2015). Broadband enhanced transmission through a single aperture based on actively loaded SRR. In AIP Conference Proceedings (pp.570016). American Institute of Physics Inc. [10.1063/1.4912802].