Phase-Loss Cascade Combination Method for Multilayer Ultrabroadband Reconfigurable Absorber

A phase-loss cascade combination (PLCC) method is proposed to provide a more intuitive idea for designing multilayer absorbers. The method focuses on reconfiguring the phase and field distribution of the multilayer structure and realizes lossy absorption in combination with them. Accordingly, three functional layers are designed to achieve phase reconfiguration, reflection suppression, and loss effects. In addition, the standing wave distribution is presented to visualize the relationship between phase and field. Varactors are utilized to broaden the reconfigurable bandwidth at low frequencies. The final measured results demonstrate a reconfigurable ultrabroadband absorption of 0.54–16.29 GHz. The low profile remains constant throughout the design progress with approximately
$0.036\lambda _{L}$
(
$\lambda _{L}$
is the longest reconfigurable wavelength).