D-VOR transmitters are used as navigation aids in aviation. In an airborne navigation receiver, a directional information (azimuth angle) related to the position of the aircraft and the location of the transmitter can be derived. In this work, the bearing accuracy of current methods is investigated. The proposed new method reduces noise and thus yields a significant increase in accuracy. Finally, the application of this new method to real measured signals confirms the theoretical expectations.

In this artice two loopantennas in freespace are modeled and simulated in a numerical field calculation program. To verify the results, two approaches based on equivalent electrical circuit diagrams (ECD) were investigated. One approach based on the ECD of a real coil and another is based on the input impedant of the antenna. The comparison of the results of the simulation and the analytical calculation of the ECD from the input impedance of the antenna showed a very good agreement.

This Paper introduces a low-cost vector network analyzer with a large frequency range made of commercial off-the-shelf components. Its architecture reduces complexity while maintaining many features of more complex designs. The design and some characteristic data is shown. The performance is better than currently available low-cost VNAs. The research was conducted as a Masters Thesis. The goal was creating a device hobbyists can afford and engineers can have on their desk for quick measurements.

In this contribution, a radar system for measuring the height profile of bulk solids in silos, is presented. By utilizing six integrated radar chips, a compact 3D imaging radar system with an novel fractal antenna layout is realized. The performance of the system has been evaluated by test measurements on a sand heap, showing an improved measurement accuracy compared to conventional radar level systems.