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In this work barium hexaferrite films for self-biased nonreciprocal devices are produced by means of the sol-gel method. The effect of the drying temperature on the film surface is examined via scanning electron microscopy. The influence of the crystallization temperature and the composition of the precursors on secondary phases is analyzed via X-ray diffraction analysis. Measurements of a coplanar...
An active 30 GHz transmit antenna array featuring digital beam forming and polarization multiplexing is presented. A fully equipped scalable module with 16 antenna elements is realized and tested. The active components and additional functional elements such as a temperature monitoring system are characterized. The radiation pattern is thoroughly assessed. The impact of mutual coupling is analyzed...
A compact and inexpensive microwave system for in situ monitoring the moisture content in concrete structures is presented. It consists of an active microwave sensor and a frequency meter. Both components and their integration are briefly described. To cover the vast moisture range of interest, the system is calibrated against the wet basis moisture content and the ambient (equilibrium) relative humidity...
A satellite transponder system for the on-orbit verification of low temperature co-fired ceramics technology (LTCC) at K-band is presented. It is part of the payload of a small scientific satellite to be launched in summer 2011. The transponder converts S-band input signals to K-band and, after bandpass filtering, back to the S-band output for downlink. The K-band stage consists of various advanced...
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