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.
Medical imaging using electromagnetic waves is a promising field of study, due to its non invasive nature and relatively low cost. Typically, it is pursued at frequencies in the microwave regime to provide adequate penetration depth. However, an increase of the frequency of operation is beneficial in order to improve the resolution, but it is accompanied by increased tissue losses. In this work we...
Near-field shaping at microwave or millimeter wave frequencies is an emerging field of study, able to accelerate a variety of technologies. Applications from sensing to medical imaging will benefit from accurate near-field shaping methods. In this communication, the use of convex optimization to shape the near field of a flat radiating aperture is investigated. The proposed approach, that is known...
We demonstrate that an integrated lens antenna (ILA) with a double lens (DL) focusing system can provide simultaneously a high broadside directivity and a low scan loss over a wide angular range. The proposed DL ILA system consists of a hemispherical substrate lens and a planoconvex objective lens. A prototype of a high-gain DL ILA with lenses made of a low permittivity dielectric material is fabricated...
The near-field (NF) regime is a highly challenging and rather unstudied area of electromagnetic (EM) fields due to the high mathematical complexity that it presents. Nevertheless, the evanescent fields, present within the near field, can offer extra flexibility and freedom in molding the close-to-the-antenna field. In this work we develop an algorithm capable to shape the EM fields according to specifications...
This paper describes the scope and on-going activities of the ESF Research Networking Program entitled “New frontiers in mm / sub-mm waves integrated dielectric focusing systems” (acronym “NEWFOCUS”).
Paper describes the electromagnetic performance of compact-size dielectric lenses typically used as building blocks for integrated lens antennas operating at the microwave to optical ranges. Three configurations of lenses are studied, namely: multi-shell spherical, extended hemielliptical, and shaped ones. Although lenses are usually considered as wideband devices whose operation principles are based...
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.