Time filter

Source Type

Ottobrunn, Germany

Maune H.,TU Darmstadt | Sazegar M.,TU Darmstadt | Zheng Y.,TU Darmstadt | Zhou X.,Karlsruhe Institute of Technology | And 5 more authors.
Microsystem Technologies | Year: 2011

The research on materials and systems for tunable microwave devices has gained attraction within the last years. The radio frequency characterization and the component design of tunable microwave components based on dielectric ceramics especially barium-strontium-titanate (BST) are presented in this second part, whereas the basic material properties are discussed in detail in the first part. After a short introduction to the processing technology used for the fabrication of tunable components based on a BST thick film, the relations between microwave properties and material properties as well as the microstructure are presented in detail. The design process for tunable microwave components based on BST thick films is described. Especially the considerations related to micro-and macrostructure and their connection are highlighted. The paper closes with two different application examples: A reconfigurable array antenna for satellite communication and varactors for high power applications. © Springer-Verlag 2011.

Maune H.,TU Darmstadt | Sazegar M.,TU Darmstadt | Zheng Y.,TU Darmstadt | Giere A.,Astyx GmbH | Jakoby R.,TU Darmstadt
German Microwave Conference Digest of Papers, GeMIC 2010 | Year: 2010

This paper analyzes design routines for their suitability in the design of tunable capacitances (varactors) based on the Barium-Strontium-Titanate (BST) thick-film technology, concerning their static and dynamic description of the component's properties. After a short introduction of the thick-film process the design rules for planar varactors are discussed in detail. Especially, a guideline for maximizing the tunability of the component is discussed by choosing the right geometry parameters.

A distance measuring device and a method for determining a distance are provided. The distance measuring device includes a reflective member, evaluation electronics and a sensor device having at least one coupling probe for feeding a transmission signal into a line structure with the reflective member. The reflective member includes a base plate with an attached collar for forming a cup-shaped element.

The invention relates to a device for detecting objects within a sweep range, comprising at least two switchable transmitting antennas, a plurality of receiving antennas, the transmitting antennas and receiving antennas respectively extending longitudinally, parallel to one another, in a first direction, and the receiving antennas being arranged in a row and the row extending in a second direction, the receiving antennas and the transmitting antennas being arranged such that they produce a synthetic receiving antenna array for the beam sweep by means of the sequential activation of the transmitting antennas and the positions of the transmitting and receiving antennas, the resulting distance corresponding to the positions of the receiving antennas in the synthetic receiving antenna array in the second direction d, the adjacent receiving antennas in the device being spaced apart by a distance of d

A device and a method for determining the position of an object, in particular of a moving object, in a three dimensional space is made available. Here the device comprises at least two switchable transmitting antenna arrays having different vertical beam alignments and a number of receiving antennas arranged in a row. The transmitting antennas are arranged spaced apart by a distance that corresponds to the distance between the outer phase centres of the receiving antennas. Otherwise the transmitting antennas can be positioned arbitrarily around the receiving antenna. The horizontal beam sweep over a wide angle range is implemented by the digital beam forming method. The vertical object position is measured by comparing the amplitude of the received signals with sequentially operated transmitting antennas having different vertical beam directions.

Discover hidden collaborations