A hybrid MoM formulation for scattering from dielectrically covered arrays of cylindrical cavities in a ground plane

Villegas, F.J.; Rahmat-Samii, Y.; Jackson, David R.

doi:10.1109/aps.2001.959459

Cited by 2 publications

(8 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The vector basis functions are comprised of the complete set of ( , ) cylindrical waveguide modes. The MoM convergence characteristics resulting from the use of such bases in discussed in [1], [2], [5], [6]. The particular transverse vector mode functions employed here are defined in [1], [2].…”

Section: A Hybrid Space-spectral Domain Mfie-mom Implementationmentioning

confidence: 99%

“…The resulting magnetic field continuity equation is . For a given aperture, we then expand the unknown aperture currents in a suitable basis (1) where and denotes the total number of basis functions. The vector basis functions are comprised of the complete set of ( , ) cylindrical waveguide modes.…”

Section: A Hybrid Space-spectral Domain Mfie-mom Implementationmentioning

confidence: 99%

“…In this section, we will present a cursory review of the hybrid MoM formulation presented in detail in [1], [2]. We begin with a MFIE defined over the finite arrangement of apertures.…”

Section: A Hybrid Space-spectral Domain Mfie-mom Implementationmentioning

confidence: 99%

“…Background I N [1] as well as a companion paper submitted to this publication [2], we have introduced a novel hybrid space/spectral-domain MoM formulation for the analysis of plane wave scattering from finite one-(1-D) and two-dimensional (2-D) arrays of cylindrical cavities embedded within an infinite perfect electric conducting ground plane. A magnetic field integral equation (MFIE) is formulated for the multiple-aperture arrangement (with the single aperture as a special case), with the unknown currents represented by the complete set of circular (TE,TM) waveguide modes [3], [4].…”

Section: Introductionmentioning

confidence: 99%

“…A magnetic field integral equation (MFIE) is formulated for the multiple-aperture arrangement (with the single aperture as a special case), with the unknown currents represented by the complete set of circular (TE,TM) waveguide modes [3], [4]. The MoM formulation introduced in [1], [2] is hybrid in the sense that the exterior (upper half-space) reactions are computed in the spectral domain, while the interior (cavity) reactions are computed directly in the space domain. In effect, this leads to a more efficient and versatile algorithm.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Scattering characteristics of finite arrays of cylindrical cavities in an infinite ground plane

Villegas

Rahmat‐Samii

Jackson

2003

IEEE Trans. Antennas Propagat.

Self Cite

View full text Add to dashboard Cite

In this paper, we investigate the scattering characteristics of finite one-dimensional (1-D) and two-dimensional arrays of cylindrical cavities embedded within an infinite perfect electric conducting ground plane. Fundamental radar cross-section (RCS) features of said arrays are illustrated, with the RCS computed with respect to the scattered (diffracted) field component, obtained directly from the aperture currents. The aperture currents on the finite structure are computed using a hybrid space/spectral-domain MoM formulation. The complete set of (TE,TM) cylindrical eigenmodes are used to represent the unknowns. The formulation is quite versatile and efficient, allowing us to include planar stratification and dissimilar cavity depths/radii in the geometry. Several rather interesting results and applications are illustrated. The dependence of the current distribution on the source polarization is shown for the canonical cavity. Three-dimensional plots of the RCS signature of a 1-D finite array illustrate the unique radiation characteristics of such structures, e.g., the constant-directivity surfaces form cones about the array axis in 3-D space. The effects of a superstrate layer on the radiation behavior of a 2-D finite array are also shown. We find that the layer can in fact either enhance or diminish the radiation, depending on the source polarization. It also tends to reduce endfire radiation in all cases. The scattering signature of large finite arrays is computed approximately by the introduction of an active element factor defined specifically for scattering problems. Using the MoM solution of a reduced window array, we obtain the far-field patterns of larger structures by a simple computation of the array factor. An improvement to this approximation makes use of an exterior equivalent source, which models the localized edge effects. Finally, the use of nonuniform arrays for sidelobe suppression and 2-D "masked" structures is illustrated.

show abstract

Section: A Hybrid Space-spectral Domain Mfie-mom Implementationmentioning

confidence: 99%

Section: A Hybrid Space-spectral Domain Mfie-mom Implementationmentioning

confidence: 99%

“…In this section, we will present a cursory review of the hybrid MoM formulation presented in detail in [1], [2]. We begin with a MFIE defined over the finite arrangement of apertures.…”

Section: A Hybrid Space-spectral Domain Mfie-mom Implementationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations