Imaging Millimeter Wave Radar with Phased Array Antenna
In the joint research project „RADARAUGE“, funded by the Federal Ministry of Education and Research (BMBF), the development of a phased array radar sensor operated at 79 GHz with active MEMS-based micro-switches is targeted for automotive environmental re
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Imaging Millimeter Wave Radar with Phased Array Antenna
R. Körber, Astyx GmbH V. Ziegler, EADS Innovation Works U. Schmid, Saarland University
Abstract In the joint research project „RADARAUGE“, funded by the Federal Ministry of Education and Research (BMBF), the development of a phased array radar sensor operated at 79 GHz with active MEMSbased micro-switches is targeted for automotive environmental recognition purposes. Basically, driver assistance systems need a narrow beam to detect objects at long distances and to reject reflections originating from objects located next to the road. To survey the traffic on several lanes in medium and short distances, however, a wide detection range is required. The movement of vehicles in the neighbourhood shall be monitored to support lane change manoeuvres etc. Both tasks can be covered by a phased array antenna, which provides electronic beam steering of a narrow lobe over a wide detection range. Beside the automotive application, the sensor can be used to detect wake-vortices of departing and landing aircrafts. This allows the optimization of the time intervals typically inserted between take-off and landing procedures.
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Introduction and Technical Objectives
The overall technical goal of the project is the hardware realization and the corresponding final field test of a radar sensor with a compact design operated at 79 GHz. This device is mainly targeted at automotive applications, requesting a broad detection range (±40°) at a simultaneously narrow lobe characteristics of each individual beam (3°x5°). These requirements are advantageously met using an antenna which is electronically steered. Due to this approach, it is possible to survey with the phased array radar sensor several lanes up to medium distances in the range of 30 to 80 m. Furthermore, a precise tracking of moving objects is feasible to determine the actual values for the velocity and for the position, respectively. Besides this usage, the device offers the qualification for a pre-warning function in the short range regime which enables a complete monitoring of the automobile up to 30 m. For the fabrication of the radar
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Components and Generic Sensor Technologies
module with reduced volume being in addition competitive in the economical sense, a highly integrated assembly is targeted applying a combination of organic and ceramic materials, such as glass-fibre reinforced polyimide and LTCC (Low Temperature Co-fired Ceramics), in a most beneficial way. To meet the tough tolerances for the lateral dimensions of core components, such as the antenna elements, the applicability of thin film technology is of utmost importance. In addition, an electrical wiring approach is envisaged mainly based on thin film elements and hence, with a reduced number of wire bonds. In an accompanying paper [1], a novel process is developed to implement locally a tailored porosity in fired LTCC substrates in the surface-near region, thus reducing the permittivity substantially. For this procedure, phosphoric acid, a
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