In this paper, the theoretical justification and the numerical verification of the anomalous scattering from cavities partially filled with metamaterials are presented. A hybrid numerical formulation based on the Finite Element Method (FEM) and on the Boundary Integral (BI) for the analysis of cavity backed structures with complex loading metamaterials is first presented. The proposed approach ...

Abstract Several porous materials, especially natural fibres and polyurethane foams, are frequently used as sound absorbers in multiple noise reduction applications. Notwithstanding their excellent absorption performance, these materials usually lack the structural strength fire resistance required for use aggressive environments or situations requiring stability. This paper proposes design of ...

This letter presents a 4 × single-layer dual-band array antenna operating in the K- and Ka-band using gap waveguide (GW) technology. Radiating elements consist of I-shaped slots located on top plate backed by novel coaxial cavity with dual-frequency operation. The two ports, one for each band, radiates directive far field pattern linear polarization. A wideband corporate-feed network is used to...

In this letter, a planar cavity-backed multiplexing antenna (SMA) is proposed and validated experimentally. A cavity realized by using novel transmission line known as substrate-integrated waveguide (SIW) technology. The design comprises five SIW cavities each one consisting of slot for launching the energy in free space. Three different types slots are employed lower mutual coupling compact ci...

In this study, a simple and compact antenna structure with dual-port dual-mode operating in single-band is proposed for wireless body area network. This composed of rectangular ring patch antenna, which shorted the outer edge to generate an omni-azimuthal radiation pattern. pattern desired on-body communication level. A substrate integrated waveguide cavity-backed slot also located at centre pr...

In this paper, a theoretical model of a micro-perforated panel (MPP) backed by a finite cavity and flush-mounted in an infinite baffle is developed and its performance in terms of sound absorption is analyzed. The model allows an oblique incidence sound impinging upon the MPP absorber. The simplified Rayleigh integral method, thin plate theory and the acoustical impedance of the MPP are used to...

This paper demonstrates a novel kind of cavity-backed self-quadplexing slot antenna for the S and C-band applications. The proposed consists 4 distinct “U”-shaped slots different lengths produces quad frequency band wireless communication systems. These are excited through separate orthogonal placed microstrip feed lines 50 Ω; generates four operating bands at 3.2 GHz, 4.1 5.8 7.2 GHz. Due to p...