Development of Numerical Codes for Modeling Electromagnetic Behavior at High Frequencies Near Large Objects
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Home > Reference > Research and information: general > Research methods: general > Development of Numerical Codes for Modeling Electromagnetic Behavior at High Frequencies Near Large Objects
Development of Numerical Codes for Modeling Electromagnetic Behavior at High Frequencies Near Large Objects

Development of Numerical Codes for Modeling Electromagnetic Behavior at High Frequencies Near Large Objects


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About the Book

A study into the problem of determining electromagnetic solutions at high frequencies for problems involving complex geometries, large sizes and multiple sources (e.g. antennas) has been initiated. Typical applications include the behavior of antennas (and radiators) installed on complex conducting structures (e.g. ships, aircrafts, etc..) with strong interactions between antennas, the radiation patterns, and electromagnetic signals is of great interest for electromagnetic compatibility control. This includes the overall performance evaluation and control of all on-board radiating systems, electromagnetic interference, and personnel radiation hazards. Electromagnetic computational capability exists at NASA LaRC, and many of the codes developed are based on the Moment Method (MM). However, the MM is computationally intensive, and this places a limit on the size of objects and structures that can be modeled. Here, two approaches are proposed: (i) a current-based hybrid scheme that combines the MM with Physical optics, and (ii) an Alternating Direction Implicit-Finite Difference Time Domain (ADI-FDTD) method. The essence of a hybrid technique is to split the overall scattering surface(s) into two regions: (a) a MM zone (MMZ) which can be used over any part of the given geometry, but is most essential over irregular and "non-smooth" geometries, and (b) a PO sub-region (POSR). Currents induced on the scattering and reflecting surfaces can then be computed in two ways depending on whether the region belonged to the MMZ or was part of the POSR. For the MMZ, the current calculations proceed in terms of basis functions with undetermined coefficients (as in the usual MM method), and the answer obtained by solving a system of linear equations. Over the POSR, conduction is obtained as a superposition of two contributions: (i) currents due to the incident magnetic field, and (ii) currents produced by the mutual induction from conduction within the MMZ. This effectively


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Product Details
  • ISBN-13: 9781720479314
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 54
  • Spine Width: 3 mm
  • Width: 216 mm
  • ISBN-10: 1720479313
  • Publisher Date: 29 May 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 150 gr


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