Depolarization of a V-band (72 GHz) Circularly Polarized Beacon Signal Due to Tropospheric Weather Events

2020 ◽  
Author(s):  
Jordan D. Keeley ◽  
S. Lane ◽  
D. Murrell ◽  
E. Hong ◽  
N. Tarasenko ◽  
...  
Keyword(s):  
Circularly Polarized ◽  
V Band ◽  
Weather Events ◽  
Beacon Signal

V-Band Wideband Circularly Polarized Endfire Multibeam Antenna With Wide Beam Coverage

2019 ◽  
Vol 18 (8) ◽  
pp. 1616-1620 ◽  
Author(s):  
Fei Yang Xia ◽  
Yu Jian Cheng ◽  
Ya Fei Wu ◽  
Yong Fan
Keyword(s):  
Multibeam Antenna ◽  
Wide Beam ◽  
Circularly Polarized ◽  
V Band

A Wideband Circularly Polarized Patch Array for V-band Low-Cost Applications

2007 ◽  
Author(s):  
Nolwenn Caillet ◽  
Stephane Pinel ◽  
Cedric Quendo ◽  
Christian Person ◽  
Eric Rius ◽  
...  
Keyword(s):  
Low Cost ◽  
Circularly Polarized ◽  
V Band

A V-band switched-beam transmit-array antenna

2014 ◽  
Vol 6 (1) ◽  
pp. 51-56 ◽  
Author(s):  
José A. Zevallos Luna ◽  
Laurent Dussopt
Keyword(s):  
Low Cost ◽  
Axial Ratio ◽  
Multimedia Communication ◽  
High Resistivity ◽  
Gain Bandwidth ◽  
Circularly Polarized ◽  
V Band ◽  
Communication Devices ◽  
High Resistivity Silicon ◽  
Source Array

A high-directivity switched-beam antenna in the V-band is presented and includes a circularly-polarized transmit-array realized in a low-cost printed technology associated with a focal source array integrated on high-resistivity silicon. The measurements show a maximum gain of 12.1 dBi, a 3-dB gain-bandwidth of 57.8–70 GHz, and an axial ratio below 5 dB. The antenna exhibits five beams pointing from −22° to +23° in one plane, its size of 25 × 25 × 10 mm3is compatible with the integration in different multimedia communication devices.

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

How to Evaluate Remote Tower Metrics in Connection With Weather Observations

2018 ◽  
Vol 8 (2) ◽  
pp. 100-111 ◽  
Author(s):  
Maik Friedrich ◽  
Christoph Möhlenbrink
Keyword(s):  
Traffic Control ◽  
Air Traffic Control ◽  
Influential Factors ◽  
Air Traffic ◽  
Weather Event ◽  
Evaluation Of Performance ◽  
Weather Events ◽  
Weather Observations ◽  
Validation Experiment ◽  
Remote Controller

Abstract. Owing to the different approaches for remote tower operation, a standardized set of indicators is needed to evaluate the technical implementations at a task performance level. One of the most influential factors for air traffic control is weather. This article describes the influence of weather metrics on remote tower operations and how to validate them against each other. Weather metrics are essential to the evaluation of different remote controller working positions. Therefore, weather metrics were identified as part of a validation at the Erfurt-Weimar Airport. Air traffic control officers observed weather events at the tower control working position and the remote control working position. The eight participating air traffic control officers answered time-synchronized questionnaires at both workplaces. The questionnaires addressed operationally relevant weather events in the aerodrome. The validation experiment targeted the air traffic control officer’s ability to categorize and judge the same weather event at different workplaces. The results show the potential of standardized indicators for the evaluation of performance and the importance of weather metrics in relation to other evaluation metrics.

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