On Bandwidth of Transmission-line-based and Inclusion-based Non-Foster ENZ Metamaterials

This paper reports active non-Foster metamaterial with reconfigurable unit cells, operating in lower RF regime (up to 300 MHz). The unit cell of this metamaterial comprises a negative capacitor, the values of which can be tuned by DC bias. In such a way, it is possible to obtain both the ENZ/DPS response. Both the single reconfigurable unit cell and the compact 1D reconfigurable metamaterial were constructed and tested.