Publications

Results 51–75 of 98

Search results

Jump to search filters

Electromagnetic coupling into two standard calibration shields on the Sandia cable tester

Warne, Larry K.; Basilio, Lorena I.; Langston, William L.; Chen, Kenneth C.

This report presents analytic transmission line models for calculating the shielding effectiveness of two common calibration standard cables. The two cables have different canonical aperture types, which produce the same low frequency coupling but different responses at resonance. The dominant damping mechanism is produced by the current probe loads at the ends of the cables, which are characterized through adaptor measurements. The model predictions for the cables are compared with experimental measurements and good agreement between the results is demonstrated. This setup constitutes a nice repeatable geometry that nevertheless exhibits some of the challenges involved in modeling non-radio frequency geometries.

More Details
TYPE SAND Report YEAR 2014
DOIOSTI

Loop-to-loop coupling

Warne, Larry K.; Basilio, Lorena I.; Langston, William L.; Salazar, Robert S.; Coleman, Phillip D.; Lucero, Larry M.

This report estimates inductively-coupled energy to a low-impedance load in a loop-to-loop arrangement. Both analytical models and full-wave numerical simulations are used and the resulting fields, coupled powers and energies are compared. The energies are simply estimated from the coupled powers through approximations to the energy theorem. The transmitter loop is taken to be either a circular geometry or a rectangular-loop (stripline-type) geometry that was used in an experimental setup. Simple magnetic field models are constructed and used to estimate the mutual inductance to the receiving loop, which is taken to be circular with one or several turns. Circuit elements are estimated and used to determine the coupled current and power (an equivalent antenna picture is also given). These results are compared to an electromagnetic simulation of the transmitter geometry. Simple approximate relations are also given to estimate coupled energy from the power. The effect of additional loads in the form of attached leads, forming transmission lines, are considered. The results are summarized in a set of susceptibility-type curves. Finally, we also consider drives to the cables themselves and the resulting common-to-differential mode currents in the load.

More Details
TYPE SAND Report YEAR 2012
DOIOSTI

A Summary of the Theory and Design Team Efforts for the Sandia Metamaterials Science and Technology Grand Challenge LDRD

Basilio, Lorena I.; Brener, Igal B.; Burckel, David B.; Shaner, Eric A.; Wendt, J.R.; Luk, Ting S.; Ellis, A.R.; Bender, Daniel A.; Clem, Paul G.; Rasberry, Roger D.; Langston, William L.; Ihlefeld, Jon I.; Dirk, Shawn M.; Warne, Larry K.; Peters, D.W.; El-Kady, I.; Reinke, Charles M.; Loui, Hung L.; Williams, Jeffery T.; Sinclair, Michael B.; McCormick, Frederick B.

Abstract not provided.

More Details
TYPE Presentation YEAR 2012
OSTI

Modeling of general 1-D periodic leaky-wave antennas in layered media using EIGER™

Proceedings - 2010 12th International Conference on Electromagnetics in Advanced Applications, ICEAA'10

Johnson, W.A.; Paulotto, S.; Jackson, D.R.; Wilton, D.R.; Langston, William L.; Basilio, Lorena I.; Baccarelli, P.; Valerio, G.; Celepcikay, F.T.

This paper presents a mixed-potential integral-equation formulation for analyzing 1-D periodic leaky-wave antennas in layered media. The structures are periodic in one dimension and finite in the other two dimensions. The unit cell consists of an arbitrary-shaped metallic/dielectric structure. The formulation has been implemented in the EIGER™ code in order to obtain the real and complex propagation wavenumbers of the bound and leaky modes of such structures. Validation results presented here include a 1-D periodic planar leaky-wave antenna and a fully 3-D waveguide test case. ©2010 IEEE.

More Details
TYPE Conference YEAR 2010
ScopusOSTI
Results 51–75 of 98
Results 51–75 of 98