Partially Transparent Jaumann-Like Absorber Applied to a Curved Structure

Abstract

A Jaumann absorber with its metal backing replaced with a combined low-pass and polarizer FSS is investigated with respect to its absorption and its polarization-dependent low-frequency transparency properties. This structure is applied to an idealized curved wing-front end, and its monostatic radar cross-section is determined. The FSS-Jaumann structure preserves an absorption similar to the planar Jaumann absorber in the higher frequency interval and enables a partial transparency in the TEzpolarization at 1 GHz. In addition, once the structure is applied to the wing-front end, a significant reduction in two-dimensional radar cross-section for both the TMzand TEzpolarization over 2–16 GHz is observed. A sensitivity analysis shows that the resistivity of the inner resistive layer has a large impact on the 1 GHz transmission.

Frequency-Selective Rasorber Based on Square-Loop and Cross-Dipole Arrays

“…Similar designs using other unit cell patterns were also reported, such as the circular loop [14], double-square-loop [15], and skewed FSS lattice [16]. Two lossy layers were also placed above a strip-type lossless FSS with a dielectric spacer between different layers to realize the reflection reduction [17][18][19]. Structures composed of lossy layers and strip-type lossless FSS were also reported with an emphasis on the absorption band [20,21], while no mention of the passband transmission was made.…”

A Frequency Selective Radome With Wideband Absorbing Properties

“…The authors of the patent present a multilayer structure formed by a frequency selective surface and by the artificial absorbing coating described in [10] which is composed by a uniform layer of conductive fibers. The patent does not present any quantitative result (neither insertion loss nor absorptive properties) but it is well known that the use of a uniform resistive layer on top of a frequency selective structure spoils the transmissivity of the radome [11], [12] making the proposed design impractical.…”

A transmissive/absorbing radome with double absorbing band

“…The main design goal is to reach one wide-band polarization-independent transmission band located in medium frequency range and two absorption wide bands above and beneath the transmission band, respectively. An important issue is to balance the transmission and reflection performance, and practical use demands reach good transmission performance while maintain two wide band absorption area in the main radar wave frequency field (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) GHz in this article). The interaction between transmission and reflection is inevitable.…”

“…While one of the design purposes of radome is to minimize the insertion loss, that is, to make the transmission coefficient approach 0 dB as near as possible . Because low‐frequency wave tends to have better penetrate ability under same circumstance, transmissive/absorbing radome have been designed for radome structure with relatively low frequency transmission window .…”