Oscar A. Peverini

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The international radio astronomy community is currently pursuing the development of a new telescope with unprecedented sensitivity, resolution and survey speed: the Square Kilometre Array (SKA) [1]. In order to cover a frequency band of 70MHz to 10GHz, a frequency band dictated by the science case, several receptor technologies are considered. These(More)
This paper presents an efficient implementation of spectral-element methods (SEMs) for the analysis of 2-D wave guide components with sharp edges. The well-known problem of ill conditioning of the mass matrix when very high-order polynomial basis functions are augmented with singular functions is addressed. A numerical process for the definition of a set of(More)
A new E-plane filtering structure suitable for very high-power telecom satellite applications is presented. The conceived configuration exploits the design flexibility provided by cascading highly integrated step/stub resonators with pseudoelliptic frequency responses. Several design examples of filters and diplexers in Ku-, K-, and Q-band are reported and(More)
This paper presents a Q-band orthomode transducer (OMT) that has been designed according to the mechanical constraints of the platelet (multi-layer) manufacturing strategy. It is composed of a twofold symmetric coupling section with two electrically identical recombination networks. The two OMT outputs lay on the same plane to provide a suitable interface(More)
In this work a mortar-element method aimed at analyzing 2D periodic structures is introduced. The mathematical formulation of a single-domain problem involving periodicity conditions is derived; then, the multi-domain feature of this numerical scheme is exploited, in order to separate regions with media with different refraction indices. Finally, a(More)
A full-wave simulator of 2-D dielectric periodic structures under skew plane wave incidence is presented in this paper. A differential formulation is used and the boundary value problem is solved by means of a multi-domain spectral method. Suitable mappings allow the efficient analysis of dielectric elements with rounded corner cross sections. A comparison(More)
In this paper the development of a full-wave simulator of the scattering from a surface-relief diffraction grating is described. The general case of skew incidence, which leads to a vector differential problem, is addressed. First, the general mathematical formulation of the discretization scheme is introduced; then, a comparison with results obtained by(More)
A novel full-wave method aimed at analyzing axisymmetric waveguide devices is introduced in this paper. The method is based on the application of the equivalence theorem in order to decouple the outer and inner electromagnetic problems. The former refers to the access waveguides, the latter to the complex shape structure inside the device, which is modeled(More)