Transparency of buildings to the radiowave propagation at VHF-UHF frequencies

The effects of large buildings on the propagation of radio waves are considered, in particular at the most commonly used terrestrial broadcasting frequencies (VHF or lower UHF). A numerical full wave analysis of the transmissions and scattering of complete buildings has been carried out and results are presented, showing is some cases a reduced attenuation and a considerable transparency

VBA macro for the construction of an EM 3D model of a tire and part of the vehicle

A VBA script has been developed, controlling all CST STUDIO SUITE™ tools to represent all mechanical elements in the space around the tire in a vehicle, incorporating this complex geometry in a parametric way. One of the applications of this script is for the study of EM field propagation inside and outside the tire. The same script is capable of choosing the appropriate mesh parameters to optimize the simulation time, with the radiating element inside the tire. It is capable also to set field monitors at all frequencies and to run the simulation automatically. The tire geometry is mainly designed with azimuthally variable tire sections, taking in account the deformation of the tire. The main advantages of designing a parametric geometry controlled by a VBA script are the possibility of: -> adapting the model to different vehicles and tire

Dual-multilayer PIFA for wideband signals

This paper presents the results of the design and realization of a compact antenna for the wireless transmission and reception of multifrequency signal with wideband characteristics. The intended use, although not exclusive, is in a station placed on a car, to receive and transmit data to and from a set of sensors placed in the interior of a tire, carrying information on the status of some tire parameters. The frequency bands in use are those of ISM (2.4-2.48 GHz) and part of the UWB (4.25-4.75 GHz). However, the antenna can be used in any other communication system with multifrequency characteristics, with appropriate modification of the dimensions in case of different operating frequencies

Validation of concentric square rings backscattering for reflectarray applications

In this paper the numerical validation of an innovative printed reflectarray is presented. The reflecting structure uses a novel kind of enhanced bandwidth re-radiating element, suitable to be optimized by an evolutionary optimization tool. In order to validate the basic concepts and the design procedure of this planar reflector, its analysis with a full-wave software has been performed: the good agreement between the numerical results obtained with the two approaches proves the feasibility of the proposed configuration

Complete full-wave analysis of a S-band reflectarray demonstrator with square ring resonators

The demonstrator of a planar reflectarray antenna for application in S-band is presented. The re-radiating elements are dual narrow concentric square rings printed on a dielectric substrate. Results are provided concerning the complete radiation pattern from the full-wave analysis and the design of the antenna syste