Energy-Selective-Surface-Based Dynamic Phase Modulation Surface
Yiling Guo, Gaosheng Li
Abstract
An energy-selective-surface (ESS)-based phase modulation surface (EPMS) is illustrated in this letter, which is composed of an ESS layer on top and a copper reflection surface in bottom. The ESS can be actively configured to achieve binary states, i.e., transmission and reflection states. Under these two states, the propagation paths of the reflection waves are different and phase modulation can be achieved. Simulations show that the match filter output of linear frequency modulation radar experiences a suppression of 10–35 dB when the EPMS are dynamically modulated with a phase differences of 140 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^\circ$</tex-math></inline-formula> –180 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^\circ$</tex-math></inline-formula> . Finally, the prototype is fabricated and measured, with a reflection phase difference of 140 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^\circ$</tex-math></inline-formula> –190 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^\circ$</tex-math></inline-formula> between two states over a bandwidth of 25.3 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\%$</tex-math></inline-formula> from 1.55 to 2.0 GHz, while the amplitude responses are almost the same. Overall, the proposed EPMS provides a new perspective for protection in energy and information domains.