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.
This paper describes parametric relationships that affect the design of high gain multibeam antennas, discusses tradeoffs, and presents optimized performance of two candidate antennas for wide-angle coverage Advanced Satcom: an aperiodic array with suppressed grating lobes and reduced number of elements, and a side-fed offset Cassegrain system with low scan loss. Given basic performance requirements...
This paper presents a method for contactless gain measurements of 50 Ohm antennas. The method is based on connecting a special passive RFID chip assembly, matched to 50 Ohm in the wide band, to the antenna and measuring the read sensitivity of the resulting tag in the tag characterization system. The gain of the antenna is then calculated from previous calibrated measurement done with reference antenna...
This paper presents impact of spacecraft scattering on the RF performance of low gain antennas used for communications satellites. The scattering analysis includes nadir deck structures, other spacecraft structures, large reflector used for high gain communication antennas, and solar panels. Impact of these spacecraft structures on both gain and cross-polar isolation of the low gain antennas is analyzed...
In this paper, we describe a compact high gain circularly polarized antenna for handheld UHF RFID reader. The antenna is an axial mode helix operating in a backfire mode with ground plane on top and reflector on the bottom. The described antenna has small footprint (85 mm in diameter) and delivers maximum linear gain > 6 dBil, standing wave ratio < 2, and axial ratio < 2 dB in 60 MHz band...
In order to meet the miniaturization of portable communication equipment, researchers have given much attention recently to compact microstrip antennas. Conventional microstrip antennas in general have a conducting patch printed on a grounded microwave substrate, and have the attractive features of low profiles, light weight, easy fabrication, and conformability to mounting hosts. However, microstrip...
This paper presents a modified single Miller capacitor feed forward compensation design for regulators resulting in a linear LDO (low dropout) regulator whose performance is independent of the off-chip capacitor and its ESR (equivalent series resistor). The proposed compensation method ensures the stability of the feedback loop and the sufficient phase margin of the LDO regulator. The proposed design...
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.