scholarly journals Broadband Operation of Acoustic Collimated Beam Source

2021 ◽  
Author(s):  
Sincheng Huang ◽  
Cristian Pantea ◽  
Vamshi Chillara ◽  
John Greenhall
Keyword(s):  
Beam Source ◽  
Collimated Beam

scholarly journals Broadband Operation of Acoustic Collimated Beam Source

2021 ◽  
Author(s):  
Sincheng Huang ◽  
Vamshi Krishna Chillara ◽  
Cristian Pantea
Keyword(s):  
Beam Source ◽  
Collimated Beam

Broadband operation of acoustic collimated beam source

2021 ◽  
Vol 149 (4) ◽  
pp. A144-A144
Author(s):  
Sincheng Huang ◽  
Cristian Pantea ◽  
Vamshi K. Chillara ◽  
John Greenhall
Keyword(s):  
Beam Source ◽  
Collimated Beam

Localization of the virtual point source used in the diffusion approximation to model a collimated beam source

1999 ◽  
Vol 9 (4) ◽  
pp. 489-499 ◽  
Author(s):  
X Intes ◽  
B Le Jeune ◽  
F Pellen ◽  
Y Guern ◽  
J Cariou ◽  
...  
Keyword(s):  
Point Source ◽  
Diffusion Approximation ◽  
Beam Source ◽  
Virtual Point ◽  
Collimated Beam

Localization of the virtual point source used in the diffusion approximation to model collimated beam source

1999 ◽  
Author(s):  
Xavier Intes ◽  
Bernard Le Jeune ◽  
Fabrice Pellen ◽  
Yves Guern ◽  
Jack Cariou ◽  
...  
Keyword(s):  
Point Source ◽  
Diffusion Approximation ◽  
Beam Source ◽  
Virtual Point ◽  
Collimated Beam

ELECTRON BEAM SOURCE MOLECULAR BEAM EPITAXY OF AlxGa1-xAs GRADED BAND GAP DEVICE STRUCTURES

1988 ◽  
Vol 49 (C4) ◽  
pp. C4-607-C4-614
Author(s):  
R. J. MALIK ◽  
A. F.J. LEVI ◽  
B. F. LEVINE ◽  
R. C. MILLER ◽  
D. V. LANG ◽  
...  
Keyword(s):  
Electron Beam ◽  
Molecular Beam Epitaxy ◽  
Band Gap ◽  
Molecular Beam ◽  
Beam Source ◽  
Device Structures ◽  
Graded Band Gap

The CNESM neutron imaging diagnostic for SPIDER beam source

2019 ◽  
Vol 146 ◽  
pp. 660-665 ◽  
Author(s):  
G. Croci ◽  
A. Muraro ◽  
E. Perelli Cippo ◽  
G. Grosso ◽  
R. Pasqualotto ◽  
...  
Keyword(s):  
Neutron Imaging ◽  
Beam Source

Use Of Non-collimated Beam For Determining The Focal Length Of A Lens By Talbot Interferomentry

1993 ◽  
Vol 22 (3) ◽  
pp. 61-66
Author(s):  
K. V. Sriram ◽  
M. P. Kothiyal ◽  
R. S. Sirohi
Keyword(s):  
Focal Length ◽  
Collimated Beam

scholarly journals High-Efficiency Polarizer Reflectarray Antennas for Data Transmission Links from a CubeSat

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1802
Author(s):  
Eduardo Martinez-de-Rioja ◽  
Daniel Martinez-de-Rioja ◽  
Rafael López-Sáez ◽  
Ignacio Linares ◽  
Jose A. Encinar
Keyword(s):  
Circular Polarization ◽  
Data Transmission ◽  
High Efficiency ◽  
High Gain ◽  
Dual Band ◽  
Left Handed ◽  
Linearly Polarized ◽  
Flat Profile ◽  
First Time ◽  
Collimated Beam

This paper presents two designs of high-efficiency polarizer reflectarray antennas able to generate a collimated beam in dual-circular polarization using a linearly polarized feed, with application to high-gain antennas for data transmission links from a Cubesat. First, an 18 cm × 18 cm polarizer reflectarray operating in the 17.2–22.7 GHz band has been designed, fabricated, and tested. The measurements of the prototype show an aperture efficiency of 52.7% for right-handed circular polarization (RHCP) and 57.3% for left-handed circular polarization (LHCP), both values higher than those previously reported in related works. Then, a dual-band polarizer reflectarray is presented for the first time, which operates in dual-CP in the frequency bands of 20 GHz and 30 GHz. The proposed antenna technology enables a reduction of the complexity and cost of the feed chain to operate in dual-CP, as a linear-to-circular polarizer is no longer required. This property, combined with the lightweight, flat profile and low fabrication cost of printed reflectarrays, makes the proposed antennas good candidates for Cubesat applications.

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