Design of a dual-band quadrifilar helical antenna for radio beacon receiver

2011 ◽  
Author(s):  
Rassamitut Pansomboon ◽  
Chuwong Phongcharoenpanich ◽  
Ravipat Phudpong
Keyword(s):  
Dual Band ◽  
Helical Antenna ◽  
Radio Beacon

scholarly journals Dual-Band Spiral Printed Quadrifilar Helical Antenna Miniaturized by Surface and Inner Dielectric Loading

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 30244-30251 ◽  
Author(s):  
Yunan Han ◽  
Haoliang Wang ◽  
Ziwei Wang ◽  
Yuchen Yao ◽  
Yingjie Feng ◽  
...  
Keyword(s):  
Dual Band ◽  
Helical Antenna ◽  
Dielectric Loading

Analysis of Dual-Band Helical Antenna for Diversity on Mobile Phones

2008 ◽  
Vol 50 (4) ◽  
pp. 417-434 ◽  
Author(s):  
A. Khaleghi ◽  
A. Azoulay ◽  
J.-C. Bolomey
Keyword(s):  
Mobile Phones ◽  
Dual Band ◽  
Helical Antenna

Dual-Band Circularly Polarized Helical Antenna for Satellite Buoy

2021 ◽  
Author(s):  
Wei-Zhi Xiao ◽  
Wei-Chen Cheng ◽  
Jwo-Shiun Sun ◽  
Guan-Yu Chen
Keyword(s):  
Dual Band ◽  
Helical Antenna ◽  
Circularly Polarized

Optimization of a Dual-Band Helical Antenna for TTC Applications at S Band

2012 ◽  
Vol 54 (4) ◽  
pp. 63-77 ◽  
Author(s):  
I. Gonzalez ◽  
J. Gomez ◽  
A. Tayebi ◽  
F. Catedra
Keyword(s):  
Dual Band ◽  
Helical Antenna

scholarly journals Radio tomographic imaging of sporadic-<i>E</i> layers during SEEK-2

2005 ◽  
Vol 23 (7) ◽  
pp. 2357-2368 ◽  
Author(s):  
P. A. Bernhardt ◽  
C. A. Selcher ◽  
C. Siefring ◽  
M. Wilkens ◽  
C. Compton ◽  
...  
Keyword(s):  
Electron Density ◽  
Dual Band ◽  
Electron Content ◽  
Total Electron ◽  
Sporadic E Layers ◽  
E Region ◽  
Sporadic E ◽  
Aeronautical Science ◽  
Computerized Ionospheric Tomography ◽  
Radio Beacon

Abstract. During the SEEK-2 Rocket Campaign in August 2002, a Dual Band Beacon (DBB) transmitting to Ground Receivers provided unique data on E-Region electron densities. Information from two rocket beacons and four ground receivers yielded multiple samples of E-region horizontal and vertical variations. The radio beacon measurements were made at four sites (Uchinoura, Tarumizu, Tanegashima, Takazaki) in Japan for two rockets (S310-31 and S310-32) launched by the Institute of Space and Aeronautical Science (ISAS). Analysis was completed for four sets of beacon data to provide electron density images of sporadic-E layers. Signals from the two-frequency beacons on the SEEK-2 rockets were processed to yield total electron content (TEC) data that was converted into electron density measurements. Wide variations in layer structures were detected. These included horizontal sporadic-E variations, vertical profiles of double, single, and weak layers. The radio beacon measurements were shown to be in agreement with the in-situ SEEK-2 sensors. The first tomographic image of a sporadic-E layer was produced from the data. The rocket beacon technique was shown to be an excellent tool to study sporadic-E layers because absolute TEC accuracy of 0.01 TEC Units can be easily obtained and, with proper receiver placement, electron density images can be produced using computerized ionospheric tomography with better than 1km horizontal and vertical resolution. Keywords. Ionospheric irregularities – Instruments and techniques – Mid-latitude ionosphere

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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