NEC4 Analysis of a Navy VLF Antenna (2006)
Deneris, C. A., Schukantz, J. H., Hansen, P. M., Logan, J. C.
This paper describes the NEC4 analysis used to evaluate proposed modifications to a Navy VLF top-loaded monopole. Charge densities are computed and used to calculate the maximum top-load gradient for...
Ferroelectric Properties of Poly (vinylidene fluoridetetrafluoroethylene). (2002)
Hicks,J. C., Jones,T. E., Logan,J. C.
This report investigates the electrical properties of a copolymer of vinylidene fluoride and tetrafluoroethylene. To accomplish this, the charge induced on the surface of the copolymer was measured...
This report presents the electric near fields of the trussed-whip, twin-whip, discone-cage, and bottom-fed fan shipboard hf antennas. It also discusses the importance of the electric near fields of...
Shipboard Antenna Pattern Inversion using Prony's Method. (2002)
Because far field antenna patterns can be expressed in terms of an exponential series of the spatial distribution of the source, they are candidates for Prony processing. Prony's method is used here...
Mini-Numerical Electromagnetic Code (MININEC). Version 3. (Computer Diskette). (2002)
File characteristics: computer program (10 files). Physical description: 1 computer disk; double density; 5 1/4 in. System requirements: IBM PC compatible; DOS; 360K. MININEC is a method of moments...
EMI Evaluation of SESEF. (1998)
Li,S. T., Logan,J. C., Tam,D. W. S.
This report describes an EMI evaluation of the effects of off-shore exploratory drilling operations on the SESEF facility at Long Beach Naval Shipyard. This study uses mathematical model simulation...
The New MININEC (Version 3). A Mini-Numerical Electromagnetic Code. (1998)
MININEC is a method of moments computer program for the analysis of thin wire antenna problems. MININEC uses a Galerkin procedure to solve for the wire currents using an integral equation formulation...
The New MININEC (Version 3): A Mini-Numerical Electromagnetic Code. (1998)
The Mini ELECTROMAGNETICS Code, or MININEC, is a method of Moments computer programs for analysis of thin wire antennas. A Galerkin procedure is applied to an electric field integral equation to...
Computer Code Validation in Electromagnetics. (1998)
Logan, J. C., Rockway, J. W., Li, S. T.
This is a discussion of some key elements and issues that contribute to a perception of the validity for an electromagnetic modeling code. A perception of validity implies that the user has...
Rockway, J. W., Logan, J. C., Deneris, C. A.
The principal goal of the Electromagnetic Compatibility (EMC) Project is to minimize exterior electromagnetic interference (EMI) problems during the life-cycle of Navy surface ships. An important...
Measurement of Electromagnetic Properties of Composite Materials. (1998)
Ho, T. Q., Logan, J. C., Schukantz, J. H., Shaw, F. W., Welch, R. Q.
This report describes four different techniques that may be used for measuring the electromagnetic properties of composite materials. Experimental data obtained from each method are presented. The...
Intermodulation Interference (IMI) Testing of Composite Materials. (1998)
Rockway, J. W., Logan, J. C., Schukantz, J. H., Danielson, T. A.
With the possibility of the large-scale use of graphite-bearing composites for topside structures and masts, some concern has been expressed as to whether these materials might be intermodulation...
Intermodulation Interference (IMI) Testing of Composite Materials. (1998)
Rockway, J. W., Logan, J. C., Schukantz, J. H., Danielson, T. A.
With the possibility of the large scale use of graphite bearing composites for topside structures and masts, some concern has been expressed as to whether these materials might be intermodulation...
Dipole and Monopole Antenna Gain and Effective Area for Communication Formulas (1998)
A comparison involving antenna measurements and performance predictions has sometimes revealed a 6-dB discrepancy between the ground wave transmission measurements and the corresponding calculations....
Thin-Wire Modeling Techniques Applied to Antenna Analysis. (1998)
This document is a summary of work performed in applying thin-wire modeling techniques in support of antenna analysis at NELC during FY74. Detailed discussion is limited to aspects which show how...