The Brewster effect plays a significant role in the transmission of electromagnetic waves with a transverse magnetic mode or p‐polarization at a specific angle. Here, a transverse electric mode ultrawide‐angle ultralow‐reflection phenomenon is proposed to realize perfect transparency at ultrawide incidence angles. Theoretical formulae are derived to provide the basis for the ultrawide‐angle ultralow‐reflection phenomenon and to explain the significant characteristics of achieving an ultrawide‐angle transmission response. As a proof of concept, a metasurface with an ultrawide‐angle ultralow‐reflection response is designed and measured, whose relative permittivity and permeability tensors are tuned by engineering an electric resonator and a magnetic resonator, respectively. This study unveils a new path for the design of ultrawide‐angle transparent surfaces.
A polarization‐insensitive three‐dimensional (3‐D) microwave absorber is proposed in this letter for ultra‐wideband radar section cross (RCS) reduction. The lossy layer of the designed absorber is evolved from the bent metallic strip with a center‐embedded resistor, which performs the property of absorption‐reflection‐absorption due to its multimode resonances. A short stub with a center‐embedded resistor is connected to the long‐bent strip to abolish the reflection performance, for the sake of achieving wide absorption performance. The fundamental working principle of the designed structure is explained adequately using an intuitive equivalent circuit model. Additionally, the absorber is designed, fabricated, and measured for validation, whose fractional bandwidths is 151.5% with at least 10‐dB RCS reduction.
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