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A well-conditioned coupled set of electric field integral equation (EFIE) and thin dielectric sheet (TDS) approximation surface integral equations for analyzing densely discretized composite structures with perfect electric conductor (PEC) and thin dielectric layer is proposed. Whereas TDS operator is well-posed, a EFIE operator is ill-posed when applied to densely discretized surfaces. This makes...
In this study, we designed a thin frequency selective surface (FSS) structure for a 5 GHz wireless local area network (WLAN) frequency bandstop. A novel hexagonal structure was designed with the intent to implement stability-affirming frequency properties in response to various incident wave angles and transverse electric (TE) and transverse magnetic (TM) polarization. The feasibility of designing...
Curved Frequency selective surface (FSS) radome was analyzed by using characteristic basis function method (CBFM). Analysis of conventional FSS radome is classified as electrically large problem and regarded as multiple excitation problem which is cause of increasing in computer resources and calculation time. CBFM is appropriate method to analyze electrically large problem including multiple excitation...
In this paper, we present a novel design of a transparent circuit analog electromagnetic absorber for building window applications to control the coverage area of wireless communication in secure building or conference room. The presented transparent absorber consists of a transparent resistive film made of an indium-tin-oxide(ITO) and glass as dielectric spacer. Recently, transparent electromagnetic...
Registration sensitivity study of double-layer cross FSS and 4-legged slot FSS designed for FSS radome was conducted in this paper. Transmission properties, from aligned structure to misaligned structure of half periodicity of unit cell between FSS layers, were discussed. Transmission properties such as center frequency, 3-dB bandwidth and specific characteristic of each misaligned double layer FSS...
Finite periodic array is applied in real situation. But, generally, assumed that periodic structure is arranged infinitely, approximate electromagnetic characteristics can be obtained efficiently. Therefore, comparison and analysis of cylindrical infinite array and cylindrical finite array are required. In this paper, scattering characteristics of cylindrical infinite periodic array are obtained efficiently...
Pade-Chebyshev approximation with Clenshaw-Lord type approximation is presented for wide-band analysis with method of moments (MoM). The surface currents can be expanded in a Chebyshev series. To improve bandwidth and accuracy of the expected results, a rational function is obtained from Chebyshev series with Clenshaw-Lord type approximation. Also, Chebyshev polynomials such as first, third, and fourth...
In this paper, the reconfigurable blind structure with frequency selective surfaces(FSS) for the building applications are presented. Frequency transmission characteristics for different angles of the proposed blind-FSSs are investigated and verified through simulation and measurement. The simulation results show that we can implement the reconfigurable blind-FSS for multiband wireless applications...
Many researches which calculate the scattering characteristic of cylinder frequency selective surface (FSS) have been made. But, most of papers don't provide the validation such as the comparison between the calculation and experimental results. In this paper, method of moment using both entire domain function of rectangular patch and cylindrical Floquet harmonics are studied for representing surface...
This paper proposes a simple design equation for A-sandwich radome design. Operating frequency and transmittance are input parameters for the design equation. For a given design specifications to achieve appropriate performance with A-sandwich radome, tedious calculations must be carried out to extract key material and structural parameters. This letter shows that when material constant and thickness...
This paper describes about a broadband cross-dipole element with four polarization reconfigurations (BCDE_PR). The BCDE_PR can configure two linear and two circular polarizations in the operating band of 1.7~2.5 GHz. To implement broadband polarization reconfigurations, broadband phase shifters of switched network types were chosen. The fabricated BCDE_PR prototype showed good electrical performances...
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