Highly Directive Biconic Antennas Embedded in a Dielectric

Abstract

Designing antennas suitable for generating highly directive electromagnetic signals has become a fundamental task. This is particularly relevant for the development of efficient and sustainable point-to-point communication channels, and for energy transfer. Indeed, these are nowadays expanding areas of research. In order to deal with said particular wave phenomena, an extension of the electrodynamics equations is taken into account, where exact solitonic type solutions are admitted. These waves may have compact support and travel along a straight line, without dissipation, at the speed of light. The result suggests the design of biconic type antennas having specific properties that are numerically examined in this paper. The cones, supplied with an oscillating source, are embedded in a dielectric material of suitable shape, with the purpose of driving the signal in the proper direction. The computations based on the extended model are aimed toward simulating the possibility of generating peculiar wave behaviors, in view of practical implementations in the framework of point-to-point communications or wireless power transmission.

Tests on High-Directivity Unconventional Biconical Type Antennas

“…The assembly is embedded in a volume occupied by a linear homogeneous medium, featuring a relative permittivity coefficient ε r > 1, whereas the magnetic permeability coefficient is µ 0 . The shape of the dielectric is designed in order to fulfill specific refraction properties as explained in [16]. A final conical metal reflector is added to the transmitting device, so obtaining the complete antenna as shown in Fig.…”

“…The dielectric part has a width of approximately 5.4 cm and height of 3 cm. Its shape has been chosen as suggested in [16], section 6, by a proper matching of the value of the relative permittivity, chosen to be r = 4 (thus a bit larger than the coefficient corresponding to PLA). The dielectric profile can be seen in Fig.…”

“…The results reported in the present paper come from the practical realization of the device proposed and designed in [16], where numerical simulations were also presented. The main peculiarity of this typology of antenna is that the signal departing from the emitter is composed by successive annular regions, traveling from the coaxial cable (TEM-mode) and emerging always preserving the same topology.…”

The magnetic body force in ferrofluids

“…Typical current densities recorded were in the range of 10 µA m −2 , and function of its velocity. By using more advanced and complete models related to electromagnetism, in particular Funaro's equations [31], here extended to the case of a fluid having a proper permeability and dielectric constant, it can be easily derived that the expression for the current density is given by:…”

10th Anniversary of Applied Sciences: Invited Papers in Electrical, Electronics and Communications Engineering Section

“…For improvement purposes, the authors proposed a long short-term memory method to predetermine the produced error. The fundamental task of designing antennas suitable for generating highly directive electromagnetic signals was studied by Chiolerio et al in [10]. The motivation of this study was the design of special antennas able to convey electromagnetic signals along patterns characterized by extremely high directivity, which ameliorated in comparison to existing commercial solutions.…”