Pyramidal adaptive antenna of planar arrays for satellite communications

2007 ◽  
Author(s):  
I. Montesinos-Ortego ◽  
J.L. Masa-Campos ◽  
M. Sierra-Perez ◽  
J.L. Fernandez-Jambrina
Keyword(s):  
Satellite Communications ◽  
Adaptive Antenna ◽  
Planar Arrays

Triangular planar array of a pyramidal adaptive antenna for satellite communications at 1.7 GHz

2009 ◽  
Vol 51 (11) ◽  
pp. 2633-2639 ◽  
Author(s):  
J. L. Masa-Campos ◽  
I. Montesinos-Ortego ◽  
M. Sierra-Pérez
Keyword(s):  
Satellite Communications ◽  
Adaptive Antenna ◽  
Planar Array

Some aspects of the defect structure in an austenitic stainless steel

1978 ◽  
Vol 36 (1) ◽  
pp. 314-315
Author(s):  
R. Gonzalez ◽  
L. Bru
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cellular Structures ◽  
Total Strain Amplitude ◽  
Total Deformation ◽  
Density Of Dislocations ◽  
Planar Arrays ◽  
Stacking Fault Tetrahedra ◽  
Distribution Of Dislocations ◽  
Very High

The analysis of stacking fault tetrahedra (SFT) in fatigued metals (1,2) is somewhat complicated, due partly to their relatively low density, but principally to the presence of a very high density of dislocations which hides them. In order to overcome this second difficulty, we have used in this work an austenitic stainless steel that deforms in a planar mode and, as expected, examination of the substructure revealed planar arrays of dislocation dipoles rather than the cellular structures which appear both in single and polycrystals of cyclically deformed copper and silver. This more uniform distribution of dislocations allows a better identification of the SFT.The samples were fatigue deformed at the constant total strain amplitude Δε = 0.025 for 5 cycles at three temperatures: 85, 293 and 773 K. One of the samples was tensile strained with a total deformation of 3.5%.

Phased Arrays for Radio Astronomy, Remote Sensing, and Satellite Communications

2018 ◽  
Author(s):  
Karl F. Warnick ◽  
Rob Maaskant ◽  
Marianna V. Ivashina ◽  
David B. Davidson ◽  
Brian D. Jeffs
Keyword(s):  
Remote Sensing ◽  
Radio Astronomy ◽  
Phased Arrays ◽  
Satellite Communications

Advanced domestic digital satellite communications systems experiments

1984 ◽  
Vol 131 (1) ◽  
pp. 92
Author(s):  
Akio Iso ◽  
Tomoyuki Izumisawa ◽  
Noriaki Ishida
Keyword(s):  
Satellite Communications ◽  
Communications Systems

Satellite communications testing

1970 ◽  
Author(s):  
R. ALBORN ◽  
J. STREISAND
Keyword(s):  
Satellite Communications
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