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.
We report on our research about the multistreaming capability of electrically small antenna arrays. It is shown that the near-field interaction of the closely spaced antennas accounts for a surprisingly good multistreaming capability. This is demonstrated for a 2 × 2 system of thin half-wavelength dipoles in a multipath environment provided by two reflector plates, and isotropic back-ground noise...
Inspired by the female Ormia ochracea's mechanically coupled ears, we propose to design a small-size transmission coupled antenna array with high performance radiation pattern. The mechanical coupling provides the female Ormia with high localization accuracy despite the small distance between its ears compared with the incoming wavelength of the source signal. The mechanical coupling between the Ormia's...
In this paper, we present a method of localizing RFID tags located in a Ricean multipath environment using a planar arbitrary array of reader antennas. By employing the well known MUSIC algorithm, we estimate the range and angular coordinates of the tags. When many reader antennas are positioned closely together, the mutual coupling between them affects the accuracy of localization. Assuming that...
The paper presents digital beamforming for Passive Coherent Location (PCL) radar. The considered circular antenna array is a part of a passive system developed at Warsaw University of Technology. The system is based on FM radio transmitters. The array consists of eight half-wave dipoles arranged in a circular array covering 360deg with multiple beams. The digital beamforming procedure is presented,...
Dipole antennas and their arrays are widely used in most of the communication applications. The analysis and synthesis of the arrays becomes simple, if the coupling is neglected as in the case of classical array theory. However, in the case of arrays of wire antennas there exists mutual coupling between the adjacent elements of the array. Moreover, the radiation properties of the array with such widely...
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.