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.
Ziegler V.,Airbus |
Schubert F.,Airbus |
Schulte B.,Airbus |
Schulte B.,Astyx GmbH |
And 3 more authors.
IEEE Transactions on Microwave Theory and Techniques | Year: 2013
This paper describes the specific development of a planar and especially low-cost near-field obstacle warning sensor system for helicopters based on an adapted electronically steerable automotive radar. All system components, from the antenna arrays, the RF modules, to the baseband processing, the signal processing algorithms, and 3-D data visualization were developed and a complete system prototype was built. Ground-based system field trials (static and dynamic sensor tests) were successfully performed during which typical obstacles like overhead power lines, trees, and poles were detected and visualized. In addition, algorithms for geo-referencing of the sensor movements and the detected obstacles were developed and verified. © 1963-2012 IEEE.
Astyx Gmbh | Date: 2010-08-04
Electron linear accelerators are used to generate X-ray radiation for the treatment of tumors. Efficient irradiation of tumors can only be guaranteed if the electron beam is guided accurately and so the required dose profile is applied. The deviation from the ideal path of the electron beam is measured by means of so-called beam position monitors and then corrected by magnets. According to the invention the deviation of the electron beam is measured in a drift tube of the linear accelerator, the wave to be decoupled having a frequency range that corresponds to a multiple of the basic frequency of the acceleration field. Coupling probes, a mixer-based receiving concept with high dynamics and sensitivity, a method for evaluating the measuring signals and a calibration method for calibrating out non-linearities are specified. Disruptive influences through the acceleration field are minimized by the measurement method according to the invention and the frequency range to be evaluated. The high evaluated frequencies also offer geometrically small coupling probes which one can introduce into a drift tube in which only the field of the electron beam to be evaluated exists.
Astyx GmbH | Date: 2012-09-04
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.
ASTYX GmbH | Date: 2014-11-11
The invention relates to a distance-measuring device for determining a distance between a reflection body in a conducting structure and a coupling region for electromagnetic waves, which region is provided on an end section of the conducting structure, said measuring device comprising a transmitting and receiving device, and a conduction junction (1) provided on the coupling region, for coupling the transmitting and receiving device to the conducting structure containing a medium, in order to couple an electromagnetic wave into the conducting structure, and to decouple the electromagnetic wave, reflected on the reflection body, from the conducting structure. Said measuring device also comprises an evaluation device for determining the distance between the coupling region and the reflection body from the complex reflection coefficient between the coupled electromagnetic wave and the decoupled electromagnetic wave. The invention also relates to the corresponding method.
Astyx GmbH | Date: 2012-07-16
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.
Astyx GmbH | Date: 2012-12-24
A distance measuring apparatus for detecting the position of a reflection body in a line structure is provided that includes a sensor device, which has at least one antenna for feeding a transmission signal as an electromagnetic wave into the line structure and for receiving the electromagnetic wave reflected on the reflection body. The sensor device also includes evaluation electronics which are configured to determine the position of the reflection body from the phase difference between the transmitted and the received wave.
ASTYX GmbH | Date: 2016-02-22
A distance measuring apparatus and method for calculating a distance in a conducting structure are provided. One distance measuring apparatus provides for calculating a distance between a reflection body in a conducting structure and an injection point provided on an end section of the conducting structure for electromagnetic waves is provided. The distance measuring apparatus includes a transmitting and receiving device with a conduction cross-over provided at the injection point for the coaxially-inductive coupling of the transmitting and receiving device to the conducting structure in order to inject an electromagnetic wave into the conducting structure and to decouple the electromagnetic wave reflected on the reflection body from the conducting structure. The distance measuring apparatus also includes an analysis device for calculating a distance between the injection point and the reflection body from the phase difference between the injected electromagnetic wave and the decoupled electromagnetic wave.
Astyx Gmbh | Date: 2012-09-04
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 d2 or greater and d2 being twice as great as distance d.