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The compliance with standards calls for proper designed EMI filters. EMI typically comprises common mode (cm) and differential mode (dm) noise. A systematic optimization of EMI filters requires the knowledge of the contribution and distribution of these two noise sources. The paper discusses different methods that allow the independent measurement of cm and dm noise. One suitable method described...
Impedance probes, which are well known in geophysical prospection, in particular for ground permittivity investigations, have been successfully transposed to space plasmas. Transmitting and receiving electrodes are used for measuring on open circuit the dynamic impedance of the system at several fixed frequencies over a range that includes characteristic frequencies of the ambient plasma. The measurements...
This paper reports on recent research on folded ref-lectarray antennas done at the University of Ulm. The first area of work deals with the investigations of reflector elements with improved phase angle range and the influence of different effects on bandwidth and antenna gain including cell type, size, or substrate layer structure. A second area of work is the precise characterization of reflector...
This paper presents an experimental study on the microwave detection of spherical dielectric bodies exhibiting varying complex permittivity from the embedding lossy dielectric medium, simulating malignant tumors of different dielectric contrast from normal biological tissue. Measurements are performed using a flanged parallel-plate dielectric waveguide probe (PPDW) on phantom materials. Preliminary...
A method to design ultra-wideband dielectric resonator antennas is described. The volume of the antenna is further reduced by employing the standard conducting mirror wall technique. The effectiveness of the method is demonstrated using HFSS simulations.
A low-loss scheme for the continuous tracking of dual-linear polarisation for application to SOTM systems is described and analysed. The technique is suitable for application at the input of any feed horn excited by orthogonal TE11 modes.
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