Reflection and transmission properties of a conductive slab in time domain

2002 ◽  
Author(s):  
M. Weber ◽  
M. Schinke ◽  
K. Reib
Keyword(s):  
Time Domain ◽  
Reflection And Transmission ◽  
Transmission Properties

Analysis for Scattering of Non-homogeneous Medium by Time Domain Volume Shooting and Bouncing Rays

2021 ◽  
Vol 36 (3) ◽  
pp. 245-251
Author(s):  
Jun Li ◽  
Huaguang Bao ◽  
Dazhi Ding
Keyword(s):  
Time Domain ◽  
Electromagnetic Scattering ◽  
Electromagnetic Waves ◽  
High Efficiency ◽  
Homogeneous Medium ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Transient Electromagnetic ◽  
Frequency Domain Methods ◽  
Scattered Fields

In order to evaluate scattering from hypersonic vehicles covered with the plasma efficiently, time domain volume shooting and bouncing rays (TDVSBR) is first introduced in this paper. The new method is applied to solve the transient electromagnetic scattering from complex targets, which combines with non-homogeneous dielectric and perfect electric conducting (PEC) bodies. To simplify the problem, objects are discretized into tetrahedrons with different electromagnetic parameters. Then the reflection and transmission coefficients can be obtained by using theory of electromagnetic waves propagation in lossy medium. After that, we simulate the reflection and transmission of rays in different media. At last, the scattered fields or radiation are solved by the last exiting ray from the target. Compared with frequency-domain methods, time-domain methods can obtain the wideband RCS efficiently. Several numerical results are given to demonstrate the high efficiency and accuracy of this proposed scheme.

Investigation of reflection and transmission properties of dielectric slabs randomly doped with conducting objects

2005 ◽  
Vol 48 (1) ◽  
pp. 83-86
Author(s):  
Daniel L. Faircloth ◽  
Michael E. Baginski ◽  
Sadasiva M. Rao ◽  
Manohar D. Deshpande
Keyword(s):  
Reflection And Transmission ◽  
Transmission Properties

STUDY ON A SORT OF CONTROLLABLE NONLINEAR LEFT-HANDED MATERIALS

2009 ◽  
Vol 18 (03) ◽  
pp. 441-456 ◽  
Author(s):  
HONG XIN ZHANG ◽  
LAN ZHAO ◽  
YING HUA LU
Keyword(s):  
Resonance Frequency ◽  
Time Domain ◽  
Material Properties ◽  
Finite Difference Time Domain ◽  
Transmission Properties ◽  
The Past ◽  
Left Handed ◽  
High Harmonics ◽  
Fdtd Simulations ◽  
Difference Time

In this paper, three kinds of controllable nonlinear left-handed materials (DNLHMs) are proposed and analyzed, which are designed by introducing inductors and capacitors into the traditional nonlinear left-handed materials (NLHMs) as inhomogeneous doped elements. Due to such changes, several new transmission properties have been presented through finite-difference time-domain (FDTD) simulations. These have brought new features to our DNLHMs. On one hand, the original passband in the traditional nonlinear left-handed material is narrowed after introducing inductors. In addition, a new passband, which does not exist in doped linear LHMs, is generated. On the other hand, through introducing capacitors, the original passband of the nonlinear left-handed material can be shifted, resonance frequency can be changed, and a new passband can be generated. When capacitors and inductors are introduced simultaneously, the material properties, such as the number of passbands, the characteristic resonance frequency, and the bandwidth, can also be changed. Noting these characteristics, the values of the introduced inductors and capacitors are varied to investigate the spectrum changes of DNLHMs. Then, a series of controllable properties of the DNLHMs can be retrieved. And more importantly, the designed DNLHMs give the adjustability of suppressing high harmonics, which is not possible in the past materials.

Time-domain terahertz reflection and transmission spectroscopy of InSb

2009 ◽  
Vol 6 (12) ◽  
pp. 2849-2851 ◽  
Author(s):  
RamuÌ„nas AdomavicÌŒius ◽  
Jan Macutkevic ◽  
Rasa SuzanovicÌŒienė ◽  
Aloyzas SÌŒiusÌŒys ◽  
Arūnas Krotkus
Keyword(s):  
Time Domain ◽  
Reflection And Transmission ◽  
Transmission Spectroscopy

SIGNATURE AND SIGNAL GENERATION ASPECTS OF EXPLOSIVE DETECTION USING TERAHERTZ TIME-DOMAIN SPECTROSCOPY

2008 ◽  
Vol 18 (02) ◽  
pp. 295-306 ◽  
Author(s):  
ROBERT OSIANDER ◽  
MICHAEL J. FITCH ◽  
MEGAN LEAHY-HOPPA ◽  
YAMAC DIKMELIK ◽  
JAMES B. SPICER
Keyword(s):  
Time Domain ◽  
Explosive Detection ◽  
Reflection Spectra ◽  
Terahertz Time Domain Spectroscopy ◽  
Reflection And Transmission ◽  
Time Domain Spectroscopy ◽  
Grain Sizes ◽  
Full Analysis ◽  
Characteristic Features ◽  
Absorption Features

In the last few years, a number of researchers including our collaboration have assembled databases of terahertz (THz) time-domain spectroscopy (TDS) absorption spectra from bulk explosives. While this was a necessary and important step in demonstrating the feasibility of THz TDS for explosives detection, the goal of our research is to demonstrate selectivity of THz spectra from the clutter of background spectra coming from the substrate such as soil or sand. We have investigated THz TDS reflection spectra from sand with different grain sizes as well as from metallic powders in order to distinguish between the signals reflected from the rough surfaces compared to distributed reflections at finite depths in the granular material. With marker materials such as tartaric acid, which have absorption features in the 1-2 THz range, we have investigated the reflection spectra of granular substrates with marker chemicals, and compared this to reflection and transmission spectra of solid materials prepared in polyethylene sample pellets. In principle, the same experiments can then be performed using TNT, RDX, HMX and PETN, which all have characteristic features in the 0.5-8 THz frequency range. Absolute molecular absorption coefficients can be measured as well, and we include here preliminary values for RDX. A full analysis will be reported elsewhere.

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