An active AMC ground plane for tunable low-profile antennas

We have designed an active Artificial Magnetic Conductor able to change its resonance by varying the diode polarization. This type of surface has been employed as backing plane for a bow-tie radiating element in order to synthesize a tunable and steerable antenna. The AMC allows to obtain a thin structure with a thickness equal to lambda/24, able to dynamically change impedance matching frequency. Moreover, the possibility of performing a beam scanning has been shown in correspondence of the mid-band frequency.