Results 261 to 270 of about 3,328,221 (312)
Some of the next articles are maybe not open access.
Antenna Radiation Pattern Compressive Sensing
MILCOM 2018 - 2018 IEEE Military Communications Conference (MILCOM), 2018Modern wireless communications is placing ever greater demands on the system's antenna. But high-resolution, wide-band antenna pattern measurement remains a slow, expensive process that can hinder research, development, and production. This paper explores the use of compressive sensing to accelerate the measurement process.
Michael L. Don, Gonzalo R. Arce
openaire +2 more sources
1969
Having examined the boundary value problem, we now want to consider a problem which might be called the boundary problem at infinity, because we want to study solutions of the Maxwell equations which have a specified asymptotic behavior. We already discussed this question in § 8 for the case e = μ = 1 and here we assume again these same values of e and
openaire +1 more source
Having examined the boundary value problem, we now want to consider a problem which might be called the boundary problem at infinity, because we want to study solutions of the Maxwell equations which have a specified asymptotic behavior. We already discussed this question in § 8 for the case e = μ = 1 and here we assume again these same values of e and
openaire +1 more source
Angular radiation pattern of Smith-Purcell radiation
Journal of the Optical Society of America B, 1984The power radiation pattern of Smith–Purcell radiation is measured at various latitudes and azimuth angles relative to the electron beam. The experimental data are used to evaluate the various models and the physical mechanisms previously suggested to describe Smith–Purcell radiation.
A. Gover, P. Dvorkis, U. Elisha
openaire +1 more source
Synthesis of a slot radiator with a given radiation pattern
Journal of Communications Technology and Electronics, 2009Synthesis of a slot cylindrical radiator with a given radiation pattern is studied. For a Gaussian pattern, the phenomenon of superdirectivity is analyzed and the parameters of the radiator providing for the optimal spread in the orders of the amplitudes of the currents on slots are estimated.
A. S. Il’inskii, E. V. Chernokozhin
openaire +1 more source
Radiation patterns of arbitrarily oriented radiating elements
1995 International Conference on Electromagnetic Interference and Compatibility (INCEMIC), 2002The radiation patterns of horizontal and vertical dipoles have been reported in the literature. These results are used in the analysis and design of arrays of parallel vertical elements and collinear elements. However no information is available for the arbitrarily oriented elements. The element patterns of such elements are derived from the concept of
P. Manju Latha +5 more
openaire +1 more source
Pattern Discovery in Internet Background Radiation
IEEE Transactions on Big Data, 2019Internet Background Radiation (IBR) is observed in empty network address spaces. No traffic should arrive there, but it does in overwhelming quantities, gathering evidences of attacks, malwares and misconfigurations. The study of IBR helps to detect spreading network problems, common vulnerabilities and attack trends.
Félix Iglesias, Tanja Zseby
openaire +1 more source
Adjustment of Radiation Pattern of Street Luminaire
2019 21st International Conference on Transparent Optical Networks (ICTON), 2019This article deals with the analyze of the radiation pattern of the street luminaire Boos Naica and suggests its modifications by turning the LEDs and reflecting surfaces. The goal is to create a more uniform optical power distribution. The street luminaires can provide two functions at the same time, illumination and communication. It is important for
Jan Vitasek +4 more
openaire +2 more sources
Intensity patterns of solar ultraviolet radiation
Environmental Research, 1977Abstract Using field measurements of ultraviolet radiation, intensity patterns by time of day and time of year are examined. Depending on location, 39 to 80% of the half-hourly readings of sufficient intensity to produce minimum erythema occur between 10:00 am and 2:00 pm during the late spring and early summer months of May through August.
J, Scotto, T R, Fears
openaire +2 more sources
Patterns of coevolution in the adaptive radiation of crossbills
Annals of the New York Academy of Sciences, 2010Although evidence for coevolution and geographic variation in its apparent strength is increasing, we still have a relatively poor understanding of why coevolution varies among interactions. Here we review how variation in the occurrence of competitors, resource stability, habitat area, and time has affected the extent of trait escalation in ...
Craig W, Benkman +2 more
openaire +2 more sources
Beam-shaped radiation pattern for uniform radiated power distribution
2014 IEEE Latin-America Conference on Communications (LATINCOM), 2014This paper presents the application of optimization methods for the synthesis of antenna arrays. The desired pattern shall exhibit a shape that allows uniform distribution of the radiated power on the Earth. Besides beamshaping, the optimization methods allow controlling the level of the sidelobes.
Edson R. Schlosser +3 more
openaire +2 more sources