Phase-Loss Cascade Combination Method for Multilayer Ultrabroadband Reconfigurable Absorber
Haoran Li, Yunfei Xia, Peiliang Wang, Kaixuan Si, Ling Miao, Zhaowang Cao, Jianjun Jiang
Abstract
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 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.036\lambda _{L}$ </tex-math></inline-formula> ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda _{L}$ </tex-math></inline-formula> is the longest reconfigurable wavelength).