Dual-grid dual-band shaped reflector antennas for AsiaSat-2

1996 ◽  
Author(s):  
R. Rayasam ◽  
M. Birdee ◽  
R. Kularajah
Keyword(s):  
Dual Band ◽  
Reflector Antennas

Flexible Dual-Band Dual-Beam Radiation of Reflector Antennas by Embedding Resonant Phase Alignment Elements for Power Refocusing

2020 ◽  
Vol 68 (6) ◽  
pp. 4259-4270
Author(s):  
Hsi-Tseng Chou ◽  
Titipong Lertwiriyaprapa ◽  
Prayoot Akkaraekthalin ◽  
Danai Torrungrueng
Keyword(s):  
Dual Band ◽  
Reflector Antennas ◽  
Beam Radiation ◽  
Dual Beam ◽  
Phase Alignment

A new dual-band primary feed for reflector antennas

1990 ◽  
Author(s):  
P. Lepeltier ◽  
M. Salvan ◽  
P. Mongrand
Keyword(s):  
Dual Band ◽  
Reflector Antennas

scholarly journals Multibeam Reflectarrays in Ka-Band for Efficient Antenna Farms Onboard Broadband Communication Satellites

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 207
Author(s):  
Daniel Martinez-de-Rioja ◽  
Eduardo Martinez-de-Rioja ◽  
Yolanda Rodriguez-Vaqueiro ◽  
Jose A. Encinar ◽  
Antonio Pino
Keyword(s):  
Dual Band ◽  
Multibeam Antenna ◽  
Broadband Communication ◽  
Reflector Antennas ◽  
Ka Band ◽  
Considerable Benefit

Broadband communication satellites in Ka-band commonly use four reflector antennas to generate a multispot coverage. In this paper, four different multibeam antenna farms are proposed to generate the complete multispot coverage using only two multibeam reflectarrays, making it possible to halve the number of required antennas onboard the satellite. The proposed solutions include flat and curved reflectarrays with single or dual band operation, the operating principles of which have been experimentally validated. The designed multibeam reflectarrays for each antenna farm have been analyzed to evaluate their agreement with the antenna requirements for real satellite scenarios in Ka-band. The results show that the proposed configurations have the potential to reduce the number of antennas and feed-chains onboard the satellite, from four reflectors to two reflectarrays, enabling a significant reduction in cost, mass, and volume of the payload, which provides a considerable benefit for satellite operators.

DNA sequence mapping in interphase and metaphase chromosomes by fluorescence in situ hybridization

1992 ◽  
Vol 50 (1) ◽  
pp. 496-497
Author(s):  
Barbara Trask ◽  
Susan Allen ◽  
Anne Bergmann ◽  
Mari Christensen ◽  
Anne Fertitta ◽  
...  
Keyword(s):  
In Situ Hybridization ◽  
Dna Sequence ◽  
Dna Sequences ◽  
Dual Band ◽  
Nick Translation ◽  
Metaphase Chromosomes ◽  
Band Pass ◽  
Texas Red ◽  
Fluorescent Spot

Using fluorescence in situ hybridization (FISH), the positions of DNA sequences can be discretely marked with a fluorescent spot. The efficiency of marking DNA sequences of the size cloned in cosmids is 90-95%, and the fluorescent spots produced after FISH are ≈0.3 μm in diameter. Sites of two sequences can be distinguished using two-color FISH. Different reporter molecules, such as biotin or digoxigenin, are incorporated into DNA sequence probes by nick translation. These reporter molecules are labeled after hybridization with different fluorochromes, e.g., FITC and Texas Red. The development of dual band pass filters (Chromatechnology) allows these fluorochromes to be photographed simultaneously without registration shift.

Dual band hybrid vehicular telephone antenna

2002 ◽  
Vol 149 (1) ◽  
pp. 41-44 ◽  
Author(s):  
L. Economou ◽  
R.J. Langley
Keyword(s):  
Dual Band
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