In this article, radiowave fading caused by fire plumes due to the burning of heaps pine needles is studied. Detailed characterization impact in terms excess loss yielded at UHF frequencies, mainly L-band, when considering two different ignition sources, also presented. The implemented small-scale scenario composed a 1 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="...

This paper presents a new methodology to model the nearground short-range propagation loss in forested areas at the VHF and the UHF band. The path loss modeling is performed by an integration of the foliage induced effect and the effect from the radiowave reflection/reflections. The analysis shows that the reflection from the dense tree canopy is important for short-range propagation at the VHF...

A method for producing radio-wave-reflecting concrete, which is potentially useful for lateral guidance in automatic highways, is provided. In the form of cement paste, it contains a small amount (0.5 vol.%) of 0.1 mm diameter carbon filaments as an admixture. The radiation absorbed is negligible compared to that reflected. The reflectivity at 1 GHz is 10 dB higher for radiowave-reflecting ceme...

This paper provides a geometrically based model for single bounce multipath components in line-ofsight (LOS) microcell radiowave propagation channels. The model characterizes the excess delay, direction-ofarrival, and received power of multipath components and is particular useful for microcell and PCS systems with low transmitter and receiver antenna heights. The model includes analytical expr...

Several wireless communication systems are developed for communication needs between train and ground or between trains in the railway or mass transit domains. In order to deploy these systems in specific environments, such as tunnels, straight or curved, rectangular or archshaped section, specific propagation models have to be developed. In this paper, we propose a method to model the radiowav...

Modal phenomena in planar metamaterial structures modeled by simple scalar frequency-dependent constitutive parameters are investigated. Modal interactions and modal transformations are found in frequency ranges close to the medium resonances when material losses are introduced and their level is continuously varied through certain critical values. Numerical results for TE and TM modes of a gro...