The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Plasmon resonances are able to produce a large field enhancement, which can be exploited for various purposes, such as biosensing or optical mixing. In this paper, the plasmon resonance of two stacked gold nanodisks separated by a tiny 2 nm gap is studied in time-domain simulations, offering the possibility of transient and broadband analysis. Moreover, time-domain simulations are amenable to extensions...
We discuss and verify experimentally the design of a 1-D planar periodic combline leaky-wave antenna that avoids the open-stopband effects as the beam is scanned through broadside.
The proposed antenna topology is an interesting radiating element, characterized by broadband or multiband capabilities. The exponential and soft/tapered design of the edge transitions and feeding makes it a challenging item to design and tune, leading though to impressive results. The antenna is build on Rogers RO3010 material. The bands in which the antenna works are GPS and Galileo (1.57 GHz),...
Modelling multiple reflections inside materials, using ray-tracing technique and Geometrical Optics (GO), is very important when deterministic propagation modelling is used in indoor environments. Indeed, when an electromagnetic wave undergoes a transmission or a reflection, the thickness of the interacting material has to be taken into account to model the wave propagation in an accurate way. Most...
In a recent work we found equivalence between the Time Reversal techniques and the use of Meta-materials in order to achieve the overcoming of the diffraction limit. Now we present the vector generalization of a formalism developed in a former study of Discrete Acoustic Time Reversal. The ulterior purpose is to apply it to electromagnetic waves, not only as an alternative to the use of left-hand materials...
The purpose of this paper is to demonstrate how the flanged-waveguide material-characterization technique, originally designed to characterize lossy materials only, can be extended to accurately extract permittivity and permeability of low-loss materials. Provided in this paper is a summary of the flanged-waveguide technique. This is followed by a discussion of how time-domain gating can be utilized...
The cylindrical cavity resonator method is presented to evaluate the complex relative permittivity of lossy materials. The loaded sample in the cavity is required to have the rotational symmetry but may have bulky and/or wide sample. To measure the sample at the specified frequency with high Q, movable dielectric supports with low permittivity and low loss are loaded in cavity. Theoretical basis of...
This paper presents a review of the current trend of terminal antenna design, which has been a focused part of modern antenna industry in last decade. Wideband, multiband and embedding characteristics of terminal antennas in different applications are the main features of this trend. Techniques often employed for these requirements are discussed. However, the relative issues for such a kind of design...
Discoveries of new materials can lead to improved technologies - especially if relevant properties can be widely varied and precisely controlled. New materials may exhibit unexpected phenomena that motivate theoretical breakthroughs and quantitative models for optimizing devices. We discuss single crystal data for the R-type ferrites BaFe2±xRu4±xO11 and the Ruddleson-Popper phase Sr2IrO4, in which...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.