Hubertus Braun

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The work presents for the first time a combination of liquid crystal phase shifter technology and dielectric resonator antenna, in an array configuration. The electromagnetic energy is coupled into the rectangular dielectric resonator from the slots in the ground plane which is then radiated from the top face of the dielectric resonator antennas. The(More)
This paper presents a dual band hybrid dielectric antenna covering IEEE.11n bands. The antenna consists of a raised folded monopole which covers the lower band WLAN 2.4 GHz, while the dielectric resonator covers the WLAN 5 GHz. The cylindrical dielectric resonator was manufactured from new glass-ceramic material. This class of new material has promising(More)
We report an electron-discharge mechanism from the floating gate of charged EEPROM cells during the first charging operation after baking (250/spl deg/C, 24 h). For an ensemble of measured EEPROM tells the discharge occurs statistically with threshold-voltage reductions up to over 1 V. Responsible is Fowler-Nordheim (FN) tunneling through the interpolyoxide(More)
This paper presents a new alternative technology to conventional ceramic techniques for the fabrication of compact and efficient microwave components like antennas and filters. It uses glass-ceramics as dielectrics which can be casted to net shape in their glassy phase and which can be crystallized afterwards. The resulting pore-free bulk materials exhibit(More)
Integration of a reconfigurable antenna module for handheld applications employing a set of novel technologies is demonstrated. A low profile dualband hybrid dielectric resonator antenna (DRA) based on glass-ceramics and a tunable matching network (TMN) based on ferroelectric varactors with a maximum biasing of 90V form a reconfigurable antenna module. The(More)
These glass ceramics are produced in a two-step process. In a first step a transparent glass with a solely amorphous structure is molten. In a second and independent step crystallites are grown in such glasses by applying a well defined time-temperature profile. By growing nanosized crystallites with ferro- or para-electric phases, pore free dielectric(More)
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