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Single-Layer, All Metallic Metasurface Filter With Nearly 90° Angularly Stable Resonance
  • Nadav Goshen ,
  • Yarden Mazor
Nadav Goshen
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Yarden Mazor
Tel-Aviv University, Tel-Aviv University

Corresponding Author:[email protected]

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Abstract

We present a method to design a single-layer angular stable metasurface (ASM) filter unit cell for a nearly full range of angles of incidence. We formulate the optimization criterion using the energy balance condition derived from Poynting’s Theorem. The proposed unit cell has a “cloverleaf” geometry, and we show that by adjusting the properties of the cloverleaf we obtain an angularly stable resonance which extends to nearly 90 degree incidence. After optimization, we revisit the energy and show using a  dispersive impedance model how optimization at three points is enough to obtain the required balance for the entire angular spectrum. The proposed ASM was fabricated from a bare aluminum sheet and measured for both TE and TM polarization, with angularly stable performance that matches the theory and simulation. The proposed design offers new capabilities for radar and antenna design applications.