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.
Horn antennas working at THz frequencies cannot be designed using conventional, e.g. rectangular or circular, metallic waveguides. This is because high losses on non-ideal conductors at THz frequencies lead to design horn antennas with a poor performance at these frequencies. To avoid this problem, this paper presents the design of antennas in the THz band by means of a new rectangular waveguide....
A rectangular waveguide for low-loss transmission at THz frequencies is proposed. The waveguide is based on the reflection of the fundamental mode on the side walls. By adding a stratified medium, a low impedance condition is obtained in the inner wall. Attenuation in side walls is eliminated.
An optimized design procedure of a beam-tilted linear polarization- radial line slot array antennas (LP-RLSA) was presented. The choice of tilt angle reveals to be crucial in achieving a uniform illumination of the whole array, as well as reaching the desired matched design. Optimization approach confirms its validity by means of a measured prototype.
In this paper, an antenna has been proposed for fast vertical scanning in cylindrical coordinates. The antenna is a travelling-wave slot-array antenna with slots activated by RF-MEMS. By switching the different RF-MEMS, the active slots vary and the radiation pattern sweeps from one side to the other side of the array. The active elements can be a group of slots or just one slot. In this paper a group...
Corrugated surfaces have been commonly used to design antennas with low cross polarization or chokes to reduce coupling. Recently, soft and hard surfaces have found novel applications due to its ability to control propagation in a desired way. One of these applications is an oversized waveguide with one single hard wall; from now on Single-Hard-Wall Waveguide (SHWW). This waveguide was first presented...
This paper presents recent advances is a new waveguiding technology referred to as ridge gap waveguides. The main advantages of the ridge gap waveguides compared to hollow waveguides are that they are planar and much cheaper to manufacture, in particular at high frequencies such as for millimeter waves. In these waveguides there are no mechanical joints. The gap waveguides have lower losses than microstrip...
A power divider in ridge gap waveguide technology has been designed to work at 15GHz. Measurements and simulations are provided. Besides, a broad numerical study of the characteristic impedance of a ridge gap waveguide is presented.
Probe correction in spherical near-field measurements is a widely studied technique used to compensate for probe polarization and pattern effects. While the polarization compensation can be carried out in a straightforward way, the pattern compensation requires the knowledge of receiving coefficients which are not easily obtained. With this aim, several techniques, which are known as probe calibration...
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.