Patent application number | Description | Published |
20080231276 | MAGNETIC RESONANCE SYSTEM WITH RADIO-FREQUENCY SHIELD WITH FREQUENCY-DEPENDENT SHIELDING EFFECT - A magnetic resonance system has a basic magnet that generates a static basic magnetic field in an examination volume, and a whole-body antenna that emits a homogeneous radio-frequency field in the examination volume, the homogeneous radio-frequency field exhibiting an excitation frequency so that nuclei in an examination subject in the examination volume are excited to emit magnetic resonance signals, and a radio-frequency shield. The radio-frequency shield is arranged between the whole-body antenna and the basic magnet. The whole-body antenna is arranged between the radio-frequency shield and the examination volume. The radio-frequency shield is fashioned to exhibit a high shielding effect in a shielding frequency range that encompasses the excitation frequency. The shielding effect drops to a significantly lower shielding effect on both sides at side bands adjoining the shielding frequency range. The shielding frequency range and the side bands exhibit bandwidths that are significantly smaller than the excitation frequency. | 09-25-2008 |
20090039983 | Magnetically Tunable Filter with Coplanar Lines - The invention relates to a magnetically tunable filter having a filter housing and having two tunable resonator spheres which comprise magnetizable material and are arranged next to one another in two filter branches. Each filter branch comprises a coplanar line arranged on a substrate layer and extending in the direction of an electrical connection, as well as a common coupling opening so that the two filter branches are connected to one another. A resonator sphere is respectively positioned on each side of the coupling opening inside the two filter branches. | 02-12-2009 |
20090051586 | METHOD AND DEVICE FOR HIGH-RESOLUTION IMAGING OF TEST OBJECTS BY ELECTROMAGNETIC WAVES, IN PARTICULAR FOR MONITORING PEOPLE FOR SUSPICIOUS ITEMS - In order to image test objects by electromagnetic waves, in particular millimetric waves, a test object is illuminated with the electromagnetic waves, the scattered waves are received, and are evaluated for a representation of the test object in the form of an image based on the principle of “synthetic aperture radar” (SAR). In order to allow as large an area as possible to be imaged with high resolution in a short time, the phase centres of the transmitting and receiving antennas are, according to the invention, moved on a circular path parallel to the respective digital focus planes of the imaging system, and are at the same time shifted linearly in a further direction parallel to the respective focus plane. The method can be used for monitoring people for suspicious objects, for example for monitoring airline passengers at an airport. | 02-26-2009 |
20110001659 | DEVICE AND METHOD FOR THE IMPROVED DIRECTIONAL ESTIMATION AND DECODING BY MEANS OF SECONDARY RADAR SIGNALS - 1. A device and a method for the improved directional estimation and decoding by means of secondary radar signals. 2.1 Radio-based positioning systems on the basis of secondary radar signals are known. For this purpose special receiver systems are utilized for estimating the direction, and special receiver systems are utilized for decoding secondary radar signals. In particular, a secondary radar system is absent, which, among others, takes into consideration any shortcomings of the hardware used, such as coupled antenna elements, different low-end impedances, deviating distances between the antenna elements, manufacturing and installation tolerances, and the like. 2.2 The device for directional estimation and/or decoding secondary radar signals according to the invention comprises the following: —at least one array A comprising M antenna elements AE—an amplifier LNA and bandpass filter F | 01-06-2011 |
20130063228 | RECONFIGURABLE BANDPASS FILTER BASED ON A PLANAR COMBLINE FILTER COMPRISING VARACTOR DIODES - A reconfigurable bandpass filter including at least a tunable planar combline filter including varactor diodes arranged on a carrier board. For automatic calibration of adjustment of blocking voltage during operation, the reconfigurable bandpass filter includes a filter control offering an external abstracted interface. A memory is connected with the filter control. The memory stores calibration data. For approximating of the best possible filter characteristic, the filter control determines, based on memorized data, the best configuration of tuning voltages. | 03-14-2013 |
20130113503 | METHOD AND DEVICE FOR MEASURING THE LOCATION OF A PARTICLE BEAM PRESENT IN PACKETS IN A LINEAR ACCELERATOR - The invention relates to a method and device for measuring the location of a particle beam ( | 05-09-2013 |
20150292921 | SYSTEM AND METHOD FOR CALIBRATING A MEASURING ARRANGEMENT AND CHARACTERIZING A MEASUREMENT MOUNT - A method and a system for calibrating a measuring arrangement on the basis of a 16-term error model determines a matrix (A) with measured scattering parameters (S | 10-15-2015 |