Helmut Essen

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Millimeterwave radar sensors are netted to cover a sufficient region of an airport and deliver as well information on position as classification of debris. To be able to miniaturize the antenna assembly, which is critical for the vicinity of a runway, the 220-GHz radar band is used. Use of this band also allows to achieve a wide signal bandwidth and(More)
G-band low-noise amplifier (LNA) modules have been successfully developed for use in high-resolution radiometric imaging applications. The WR-5 waveguide modules contain a four-stage 220 GHz cascode LNA MMIC and two microstrip-to-waveguide transitions which were realized on 50 mum thick quartz substrates. The monolithic amplifier circuits were fabricated(More)
In this paper, we present the development of a W-band power amplifier (PA) circuit and a G-band low-noise amplifier (LNA) MMIC for use in a high-resolution radar system operating at 210 GHz. The power amplifier circuit has been realized using a 0.1 um InAlAs/InGaAs based depletion-type metamorphic high electron mobility transistor (MHEMT) technology in(More)
The SAR/GMTI sensor PAMIR of Fraunhofer FHR supports in its newest upgrade a bandwidth of 3.6 GHz enabling a resolution of about 4 cm. This capability allows detailed image analysis in urban areas, e.g. the detection and classification of stationary vehicles. To this end SAR images of stationary vehicles in different resolution scales has been analysed and(More)
Interferometric Synthetic Aperture Radar has the capability to provide the user with the 3-D-Information of land surfaces. To gather data with high height estimation accuracy it is necessary to use a wide interferometric baseline or a high radar frequency. However the problem of resolving the phase ambiguity at smaller wavelengths is more critical than at(More)
This contribution describes a novel millimeter-wave radar system for security checks of persons. The goal of the system is not the classical airport checkpoint situation, but it should support existing security systems by a fast and effective prescreening of moving persons to identify threats in an early stage. With the proposed experimental system,(More)