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.
Quasi Conformal Transformation Optics (QCTO) is employed here to produce 3D gradient-index lenses. These lenses are able to improve radiation properties of conventional antennas, such as gain, side lobe levels and cross polarization.
Transformation optics (TO) is a novel method that creates a mathematical link between material properties and a set of coordinate systems [1,2]. There has been a significant amount of interest in the literature due to the possibility of this technique to design an electromagnetic cloak [1] capable of concealing an object at optical frequencies. This is, however, incredibly difficult to realize due...
This paper describes a two-dimensional optical transformation method that can be used to tailor the propagation of waves confined to a surface. Virtual and physical geometries are employed, and the equivalence of the wave behaviour on these two different surfaces is illustrated using full wave simulations of a graded-index loaded waveguide. This technique has great promise to design devices that are...
An all-dielectric carpet cloak, formulated using the optical transformation technique, is presented here. The carpet cloak was fabricated by implementing a dielectric disk matrix (DDM) with varying periods. To demonstrate that it is functional for multiple angles of incidence, the cloak is measured in a near-field scanner. The performance of this cloak is then quantitatively compared to that of a...
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.