An Evaluation and Preparation of Magnetic Fluid Composites for Use at Millimetre Wavelengths.
Abstract
Magnetic fluids containing magnetite particles have been combined with micron sized particles of ploystyrene, copper, tin, silver and aluminum to form magnetic fluid composites. The microwave transmission properties of samples up to 1mm thick have been studied using a 3mm wavelength source and also a fully automated Fourier Transform Spectrometer. Large reductions in the transmission of the samples have been observed in fields of less than 60 Oe. The decrease in transmission arises due to metallic particle alignment in the presence of an applied field. A theoretical model for the composites has been used and the predictions are in very close agreement with experiment. The possibility of using composites as modulating devices for the 3mm wavelength range is discussed. Keywords: Magnetic fluids; composites; microwave; millimetre; wavelength; alignment; dichroism; modulation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1986
- Accession Number
- ADA177325
Entities
People
- J. P. Llewellyn
- J. Poppelwell
- P. Davies
Organizations
- Bangor University