Results 181 to 190 of about 197,522 (217)

Measurements of beyond horizon propagation loss

2011 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, 2011
The behavior of the path loss between two base stations has been investigated via measurements using one fixed transmitter and a helicopter-borne receiver. This has allowed the gathering of data for a range of distances and antenna heights, including beyond horizon conditions and antennas below and above the clutter.
H. Asplund, J. Medbo, J.-E. Berg
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Atmospheric models for over-ocean propagation loss

MILCOM 2015 - 2015 IEEE Military Communications Conference, 2015
Humidity over the ocean tends to be higher than over land, and long-range links at frequencies above 10 GHz may experience large propagation loss due to atmospheric absorption. When high link reliability is required, the log-normal assumption used to estimate power margins from the loss mean and standard deviation is not accurate.
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Propagation Losses Of Thin Film Waveguides

SPIE Proceedings, 1988
Propagation losses of ZnS thin film waveguides have been investigated. The effects of oxygen and water backpressures during the deposition of ZnS thin films on waveguide performance and microstructure have been observed. These effects dominated losses caused by surface finish. A decrease in losses, and a change in preferential crystal orientation from (
M. D. Himel, J. A. Ruffner, U. J. Gibson
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Propagation Losses in Fibers and Waveguides

2011
In view of the very small propagation losses for light guided via high-purity optical fibers drawn from highly transparent glasses with linear attenuation coefficients below 10−4–10−5 cm−1, one could think of the necessity to develop extremely sensitive measurement procedures detecting internal losses in such fibers.
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Propagation Loss Prediction Models

2009
This chapter contains sections titled: Introduction Empirical Models Analytical Models Deterministic Methods Summary This chapter contains sections titled ...
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Propagation and loss in layered viscoelastic composites

The Journal of the Acoustical Society of America, 1997
The acoustic response of a source in an anisotropic viscoelastic medium has not only a directionally dependent speed of propagation, but also a directionally dependent rate of attenuation. The long wavelength properties of a layered composite comprised of two alternating constituent layers, both of which are isotropic, but with one elastic and the ...
Wallace R. A. George, Michael Schoenberg
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Propagation loss and MSSW delay lines

IEEE Transactions on Magnetics, 1974
Propagation loss measurements of magnetostatic surface waves are reported and related to recent theory. They are also compared with other published loss data. Recently, a frequency independent damping parameter, λ, for MSSW's has been related to the dB/μsec loss. Using our data we find \lambda = 0.88 \times 10^{4} Hz.
J. Sethares, M. Stiglitz
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Propagation losses in dielectric image guides

IEEE Transactions on Microwave Theory and Techniques, 1988
The authors calculated the propagation losses of a dielectric image guide using the effective dielectric constant (EDC) method to a higher order of approximation. It was found that there exist a minimum in the waveguide attenuation that has not been alluded to in the literature, and also a peak in the imaginary parts of the transverse propagation ...
J. Xia, S.W. McKnight, C. Vittoria
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On the reduction of wave propagation loss in tunnels

IEEE Transactions on Electromagnetic Compatibility, 1992
The reduction of radio wave attenuation in two-dimensional tunnels is discussed. The attenuation of the dominant mode due to its field penetration into the lossy dielectric side wall is reduced by means of the attachment of periodically aligned metallic strips on the wall surface.
Y. Yamaguchi, T. Honda, M. Sengoku, S. Motooka, T. Abe   +4 more
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“Transmission loss” and “propagation loss” in undersea acoustics

The Journal of the Acoustical Society of America, 2005
Ainslie, Michael A., Morfey, Christopher L.   +1 more
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