4 Contributo in Atti di Convegno (Proceeding)

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Reconfigurable antenna based on liquid crystals for continuous beam scanning with a single control

This work presents an electronically scanning leaky wave antenna based on liquid crystals. The antenna provides a continuous scanning at fixed frequency with a single voltage control. The radiating part is constituted by a parallel plate waveguide filled by liquid crystals with gradually modulated, electrically small slots etched on the upper wall. The feeding network is realized through a pillbox network. The concept is first validated through the realization and experimental characterizatio...

Overview of RLSA Antenna Design and Optimization Techniques developed at the University of Siena

In this paper, we present an overview of radial line slot array (RLSA) antenna design and optimization techniques developed in the past years at the University of Siena, both for near and far field applications at microwaves/millimeter waves. Moreover, also the possibility of generating localized pulses in time domain by means of RLSA is briefly sketched.

On the (local) phase center of an antenna and its explicit derivation

In this paper we provide explicit formulas to calculate the phase center location of an arbitrary antenna. Such a formulation allows the description of the phase center dependence from the observation aspect and from the frequency.

Wiener-hopf analysis of the diffraction by a half-plane dipole array

We present a rigorous solution to the canonical problem of the scattering by a semi-infinite planar array of dipoles, presenting an edge truncation, when illuminated by a plane wave. By applying the Wiener-Hopf technique to the Z-transformed system of equations derived from the electric field integral equation, we provide rigorous close form expressions for the current on the dipoles. We prove that such currents are the superposition of the infinite array Floquet-wave solution plus a perturba...

Exact Formulas for the Determination of Antenna Local Phase Center

This paper presents exact formulas for the calculation of antenna local phase center. It will be shown that the knowledge of equivalent current distribution on an arbitrary radiating aperture allows the determination of phase center exact position. We will prove that the transverse coordinate (with respect to the observation direction) of phase center can be interpreted as the electromagnetic barycenter of the electric and magnetic current distributions, whereas (with respect to the observati...

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