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01 Sep 2007TL;DR: The ACE Activity 2.3 as mentioned in this paper coordinates and structures European research on wideband and multiband antennas, which comprises three work packages: WP 2.1-1 on wide-band and multi-band radiators, WP 2.3-2 on reflector surface models, and WP 2..3-3 on antennas for subsurface radars.
Abstract: Developments in wireless communications and sensing require increasingly wider frequency bands and that multiple junctions can be provided by a single antenna system. This paper presents an overview of the current work in ACE Activity 2.3, which coordinates and structures European research on wideband and multiband antennas. The activity comprises three work packages: WP 2.3-1 on wideband & multiband radiators, WP 2.3-2 on reflector surface models, and WP 2.3-3 on antennas for subsurface radars. The paper discusses main areas of joint research and development, presents main results achieved, and relates the work to that of other ACE Activities. Main future challenges will be to maintain at least some of the current activities, when the funded period of ACE finishes by the end of 2007, and extend the cooperation to more partners in the ACE Community.
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TL;DR: In this paper, the shape of an aircraft is treated mathematically throughout, and all data from the mathematical definition of shape are delivered in coordinate tables and the outer surface is divided in different segments in a suitable way.
Abstract: Analytical definition of airplane shape in combination with coordinate dimensioning has been shown to be a powerful tool in aircraft production. A very practical method for shape definition has been used at SAAB, Sweden for more than 20 yr. The shape of an aircraft is treated mathematically throughout, and all data from the mathematical definition of shape are delivered in coordinate tables. The outer surface of an aircraft is divided in different segments in a suitable way and the equations of the longitudinal and the sectional boundary curves are chosen to be as simple as possible. In this way anything concerning the aircraft shape which is of importance in production and design can be calculated. The method described below is fully applicable even if a computer is not available.
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01 Jan 2018TL;DR: Dengeling is a new surface mechanical treatment developed as an alternative to the shot peening method used for enhancing the fatigue resistance of metallic materials as mentioned in this paper, which has been used for a number of applications.
Abstract: Dengeling is a new surface mechanical treatment developed as an alternative to the shot peening method used for enhancing the fatigue resistance of metallic materials. In this work, Dengeling is co ...
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23 Aug 2007TL;DR: Radar-Fullstandsmessgerat as discussed by the authors is a type of radar fullstands, which is defined as "a system that is defined by a set of geometrically defined begrenzungs of a Behalter relativ zu einer Messposition".
Abstract: Radarfullstandsmessgerat, das zum Messen eines Abstandes zu einer Oberflache eines Inhalts in einem Behalter relativ zu einer Messposition, die uber der Oberflache liegt und in Bezug auf eine untere Begrenzung des Behalters geometrisch definiert ist, mit einem Nahbereichsradar vorgesehen ist, wobei das Radarfullstandsmessgerat umfasst:eine Stromversorgungsschnittstelle zur Aufnahme von elektrischer Leistung fur das Radarfullstandsmessgerat,eine Kommunikationsschnittstelle zur bezuglich des Radarfullstandsmessgerates externen Wiedergabe von Information basierend auf dem Abstand,einen Sender (DC) zum Erzeugen und Senden eines elektromagnetischen Sendeimpulses mit einer Leistung von weniger als einem Watt,eine Signalmediumschnittstelle (12), die mit einem Mittel (7) zum Richten des Sendeimpulses auf die Oberflache und zum Empfangen eines von der Oberflache reflektierten Empfangsimpulses verbindbar ist,eine Befestigungsstruktur (8) zum Befestigen der Signalmediumschnittstelle (12) in der Messposition,einen Empfanger (23) zum Empfangen des Empfangsimpulses,einen Schalter (26'), der eine Verbindung jeweils des Senders (DC) und des Empfangers (23) mit der Signalmediumschnittstelle (12) ermoglicht, undeinen Controllerschaltkreis (27') zum Steuern des Betriebs des Schalters (26') und zum Bestimmen des Abstandes,wobei der Schalter (26') dazu geeignet ist, eine Impulserzeugung durchzufuhren, indem die Signalmediumschnittstelle (12) mit dem Sender (DC) entsprechend einer Gleichspannung wahrend einer Zeitspanne verbunden wird, die gleich einer gewunschten Impulsbreite ist, und um die Signalmediumschnittstelle (12) mit dem Empfanger zu verbinden, wahrend der reflektierte Impuls empfangen wird,wobei der Schalter (26') eine Schaltzeit aufweist, die kurzer ist als 100 ns, um eine Erfassung eines kurzen Abstandes zu ermoglichen.
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08 Oct 2012
TL;DR: In this paper, the authors discuss some advanced topics of direction finding of communication signals and respective antenna arrays in the frequency range from 20 to 3000 MHz, and show that especially polarization aspects deserve more attention than traditionally paid.
Abstract: The paper discusses some advanced topics of direction finding (DF) of communication signals and respective antenna arrays in the frequency range from 20 to 3000 MHz. There are a number of issues contributing to potentially severe performance degradation of an installed system in its typical operational environment compared to the same system operated under the well-defined test conditions on an antenna test site. It is shown that especially polarization aspects deserve more attention than traditionally paid.
Authors
Showing all 760 results
Name | H-index | Papers | Citations |
---|---|---|---|
Christer Larsson | 64 | 272 | 12916 |
Björn Johansson | 62 | 637 | 16030 |
David C. Viano | 48 | 232 | 8283 |
Thomas Schiex | 47 | 138 | 11031 |
Robin Hanson | 28 | 114 | 3519 |
Per Lötstedt | 28 | 109 | 2960 |
Brigitte Mangin | 26 | 48 | 2652 |
Lars Hanson | 19 | 117 | 1138 |
Carl Gustafson | 17 | 34 | 1035 |
Magnus Carlsson | 16 | 37 | 808 |
Per-Johan Nordlund | 14 | 26 | 2738 |
David Allouche | 14 | 26 | 680 |
Mark A. Saab | 13 | 16 | 1153 |
Andreas Gällström | 13 | 34 | 402 |
Hans Hellsten | 12 | 37 | 549 |