Multiple Angle of Incidence Measurement Technique for the Permittivity and Permeability of Lossy Materials at Millimeter Wavelengths
Abstract
A technique of measuring the permittivity and permeability of lossy, homogeneous, linear, isotropic materials at millimeter wavelengths was developed. The technique was tested by measurement of representative materials at a frequency of 94 GHz. For the type of materials under consideration, the permittivity and permeability are complex and general. Thus there are four unknowns to be determined and a minimum of four measurements are required. The approach taken was to measure the magnitude of the transmission coefficient of a planar material sample in free space at multiple angles of incidence. The system of equations obtained from any four of the angles is solved numerically for the permittivity and permeability of the sample. The equipment consisted primarily of a Gunn phase-locked millimeter-wave oscillator, a pair of conical horn/lens antennae, a sample holder/positioner, and a microwave receiver. Harmonic mixing was employed to convert the test waveform to the operating range of the receiver.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1986
- Accession Number
- ADA178851
Entities
People
- John C. Joseph
Organizations
- Air Force Institute of Technology