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.
Over the past 10 years or so, many broadband and ultra-wideband antennas have been developed for broadband high data rate mobile communications. It is realized how to make efficient and accurate measurements for such antennas could be a challenging issue. In this paper, we examine the antenna efficiency measurement techniques which have been used up to now, and identify their advantages and disadvantages...
The ultra wide band (UWB) systems require antennas having a very broad impedance bandwidth. The planar inverted-F antenna (PIFA) is widely used in mobile and portable devices due to its excellent performance. But it is not used as an ultra wide band antenna as it is assumed to be a narrow band antenna. This paper is aimed at addressing this problem by introducing a PIFA antenna having a parasitic...
Recently, Wheeler cap method was extended to measure wideband antennas. This paper presents an investigation on the effects of the loss of wheeler cap on antenna efficiency measurement results. Two caps/cavities (one large and one small) are employed for this study and numerical simulation is also conducted to aid the analysis. Both the experimental and numerical results show the loss due to the imperfection...
Most portable UWB antennas generate near omni-directional radiation pattern which is not suitable for some applications. In this paper, we present a numerical and experimental investigation of a wideband (4.5 GHz to 8.5 GHz) microstrip slot antenna of reduced size which produces a directional pattern. It is found that the optimum design of this antenna can be achieved by cutting a wide slot at the...
One of the tasks of the European antenna centre of excellence (ACE) is to investigate the time domain systems for antenna measurements, especially for ultra-wide band (UWB) antennas. In this paper, different time-domain measurement systems from three different organisations within the ACE are described and discussed along with some measured results. Some discrepancies and problems are identified....
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.