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.
The following topics are dealt with: antennas; antenna engineering; antenna propagation; RF devices; microwave devices; metamaterials; wireless networks; UWB communications; MIMO communications; and GPS.
In this paper we identify some challenges in antenna designs-both small and large types-that we have recently encountered in the process of designing antennas for personal communication, GPS, UWB, Millimeter waves, BANs (body area networks), sensors, RFID, and other similar applications. The primary challenges in designing small antennas arise from the specifications that are often very demanding...
Engineered materials, such as new composites, electromagnetic bandgap, and periodic structures have attracted considerable interest in recent years due to their remarkable and unique electromagnetic properties. Among this class of media are the magnetic photonic (MPC) and degenerate band edge (DBE) crystals. These periodic media have the concurrent characteristics of wave slow down and impedance matching...
Millimetrewave systems are becoming increasingly important in many scientific, civil, and military applications because they can provide wider bandwidth for transmitting large amount of data and better resolution in radar systems. However their history goes back to the early days of wireless communications. In this paper we will look at the early millimetrewave experiments of Bose through current/potential...
Negative-Refractive-Index Transmission-Line (NRI-TL) Metamaterials comprise transmission lines loaded periodically with series capacitors and shunt inductors, such that the phase flow and power flow are contra-directional on the lines. These NRI-TL media exhibit properties that can be utilized for miniaturizing microwave devices and antennas. A compact antenna, power divider and branch-line coupler...
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.