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A super wideband radiator (SWB) with the simplest topology and architecture is proposed. The superb results and EM characteristics are recorded by this radiator: 1) the widest bandwidth, to the author knowledge, ever reported from 5GHz till 150GHz, 2) no pattern deformation attested in decade-bandwidth, 3) the smallest form-factor ever achieved. SWB prototype is designed, fabricated and evaluated...
In this work we assess the feasibility of focused electromagnetic ablation of breast cancer. In our approach we consider two degrees of freedom, namely the bolus permittivity and the operational frequency. The electric fields in a two-dimensional configuration are computed per source using the iterative conjugate gradient method. The fields are subsequently focused in two lesions. The focusing performance...
The time-domain receiving properties of a multi-mode cylindrical waveguide antenna are investigated. The configurational properties of the antenna are characterized by the time-domain scattering matrix that interrelates the time-domain amplitudes of the axial modal constituents traveling towards and away from the radiating aperture of the waveguide, which is taken as their reference plane. The excitation...
This paper will give an overview of the recent advances on an innovative sparse array synthesis technique for the design of satellite antenna arrays. The equi-power sub-arrays constituting the aperiodic array are placed on a lattice reproducing the positions of the sunflower seeds, opportunely adjusted according to a desired tapering law. This particular non-uniform lattice is selected, essentially,...
The working principles of coplanar-waveguide (CPW) -fed, ultra-wideband (UWB) printed antennas are investigated. The behavior of the current distributions at different frequencies are examined. The modifications in the current distributions when the phase of the currents changes lead us to some conclusions on the behavior of UWB antennas.
Enhanced Leaky lens antennas provide new opportunities for the development of wireless links over extremely large bandwidths without dispersions. In this contribution the potentials in this respect are presented. We provide the experimental characterization of a planarly fed ultra-wideband leaky lens antenna including a brief description of two antenna prototypes with radiating elements realized in...
The inter-channel isolation of an FMCW radar with interleaved transmit-receive array antennas is, for the first time, characterized by measurements on an operative system. Theoretical predictions, based on full-wave simulations, are compared to computations from the measured antenna scattering parameters. In both cases, the received signals are re-combined by using ideal equi-phase and equi-amplitude...
The pulsed signal transfer between transmitting and receiving loops employed for inter-chip and intra-chip wireless interconnects in integrated circuit devices is investigated. A computational model, based on the electromagnetic reciprocity theorem of the time-convolution type, is developed. The transmitter loop excitation is modeled as a causal, unipolar pulse characterized by its pulse amplitude,...
An innovative aperiodic planar array for satellite communications has been recently proposed [1–2]. The configuration presented guarantees an almost rotationally symmetric pencil beam pattern and a very low sidelobe level. In order to improve the directivity, while keeping limited the number of controls, the available aperture is filled with different sized sub-arrays. In this work the ideal radiators,...
A novel analytically based synthesis technique for the design of sparse antenna arrays is presented. The proposed technique permits the synthesis of linear arrays with arbitrarily shaped patterns and it is applied here to the design of an Earth-coverage antenna featuring a shaped radiation pattern with an isoflux uniform illumination on the field of view (FOV).
The shared aperture antenna, an effective and versatile radar front-end design strategy based on deploying interleaved sub-arrays on a common aperture, is discussed. A number of instantiations of this concept, demonstrating multi-functionality and polarisation agility capabilities, is described in detail. Some limitations of this concept are singled out, and measures to counteract them are put forward.
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