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.
Low-sidelobe radiation patterns with good directivity can be generated by antennas consisting of a linear array of parasitic dipoles in front of a smaller linear array of active dipoles fed uniform voltages, a configuration that facilitates the task of feed network design. The fundamental effect of the parasitic array is to allow the length of the active array to increase by a factor of 2 or more,...
Conclusions In this paper, a phased array antenna (PAA) using crossed dipole antenna elements is examined. A partially driven array technique is used for the array antenna. From the analyzed results, it is shown that the element antenna has conical radiation pattern. Using the element antenna, the beam scanning characteristics of the PAA is investigated. It is found that this array antenna can scan...
A design for a new quasi-Yagi antenna suitable for fabrication on low-cost, low dielectric constant materials such as LCP was developed by replacing the half-wavelength dipole driver element with a folded dipole. The input impedance of the folded dipole quasi-Yagi antenna and its resonance frequency may be tuned by properly adjusting the parameters of the folded dipole giving more freedom for optimization...
In this article, we propose a spherical shell-core structure which is able to achieve arbitrarily large directivity. The structure is obtained from coordinate transformation. A small antenna can be projected to free space with a large dimension, which subsequently leads to a large directivity.
For lossless receive antennas, the power absorbed and delivered to a conjugate matched load can be obtained by computing a net power lost within a volume that includes the antenna. Maximum achievable received powers by different planar array configurations were analyzed. It was found that both a grounded dipole array, and an array of electric/magnetic dipole combinations, are capable of receiving...
In this paper, a prototype of active frequency selective surfaces (AFSS) screen based on the simple dipole strips has been proposed for a reconfigurable radiation pattern antenna. The results achieved in the measurements confirm the expected objectives for the proposed structure. However, it has been observed that the parasitic elements created by the active elements are indeed the main problem in...
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.