Magnetic probe factor with consideration of probe tilt for near-field measurement
This paper presents a frequency and space dependent analytical model of near-field magnetic probe factor with probe tilt angle for measuring electromagnetic emissions. The principle and derivation of the probe factor are elucidated. The vector-network-analyzer (VNA) measurement of the probe factor is also introduced. The correlation between the measured and calculated probe factors is finally demonstrated.
Radiation from Microstrip Discontinuities
Radically different methods of calculation by Lewin and by van der Pauw are compared. It is shown that the difference in the two sets of results is due not to the difference in method, but to assumptions on the value of dielectric constant to be used when calculating the substrate polarization. Curves show that differences of up to 30 percent can arise from this source, but the differences are much smaller for the larger values of dielectric constant.
An optically linked three-loop antenna system for determining the radiation characteristics of an electrically small source
Experimental results on an antenna system for determining the radiation characteristics of an electrically small source are presented. Three orthogonal loop antennas, each terminated at diametrically opposite points with identical loads, encircle the source and characterize its equivalent electric and magnetic dipole moments. The total radiated power can be determined from this near-field measurement of the device under test. The test system operates from 3 kHz to over 100 MHz with up to 90 dB of dynamic range. Test results are presented for a system constructed from three 1-m-diameter loops.<<ETX>>