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.
In this paper, we present a multifunctional active frequency selective surface (MAFSS), which consists of two metallic layers and a substrate layer. Three electromagnetic functions of switching, polarization selection and frequency tuning, are integrated into a single board. The bias networks are embedded in each layer and comprise the MAFSS elements themselves, which eliminates the need of extra...
In this paper, we propose a multifunctional active frequency selective surface (MAFSS), which can be switched freely between the electromagnetic switching function and the polarization selection function. Thus, four different working states can be attained by controlling two external bias networks independently. Resonant structures take upon themselves the role of allowing DC currents to pass through...
In this paper, a novel dual-band dual-polarized array antenna with low frequency ratio and integrated filtering characteristics is proposed. By employing a dual-mode stub-loaded resonator (SLR) to feed and tune with two patches, the two feed networks for each polarization can be combined, resulting in the reduction of the feed networks and the input ports. In addition, owing to the native dual resonant...
Collaboration tools support global software engineering (GSE) by providing relevant information and work context to developers, essentially seeking to provide a local context for developers working globally. Although many collaborative tools have been developed, we have insufficient knowledge of how they are used in practice. In this paper, we review the recent empirical studies on collaboration tools...
The loading paths are very important for hydroforming results in tube hydroforming, and need to be designed carefully. But the optimal loading paths are difficultly obtained by using empirical, analytical and experimental methods. FE simulation is perceived by the industry to be a cost-effective process analysis tool compared to the conventional hard tooling prototyping. Unfortunately, the prevalent...
In this paper, a novel conical quadrifilar helical antenna for GPS application is presented. The antenna behaves wide beamwidth and circular polarization. Numerical simulations show that the pitch angle and the length of radiating arms are main factors which influence the beamwidth of this kind of antenna. The model antenna designed working at center frequency of 1.5968GHz characterizes: (1) about...
Grammar based test generation (GBTG) has seen extensive study and considerable practical use since the 1970s. GBTG was introduced to generate source code for testing compilers from context-free grammars specifying language syntax. More recently, GBTG has been applied to many other testing problems, including the generation of eXtensible Markup Language (XML) documents. Recent research has shown how...
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.