CST – Computer Simulation Technology

Design of an Array for very short Range Radars

Alfredo De Leo, Università Politecnica delle Marche Very short range radars can be usefully adopted for many applications: GPR, monitoring of physiological activity both for safety and security contexts, electronic travel aids, automotive. In the first stage, the goal of the work is the design and the optimization of an array of patch antennas, considering the array radiating in free space, and working in the 77 GHz frequency band, in order to achieve a miniaturized, cheap, and conformable device. This study is developed using CST Microwave Studio, which allows us to carry out a parametric analysis and its result is the antenna shown in figure 1, having more 4 GHz of bandwidth centred at desired frequency, as shown in figure 2. The most critical part of the work is the analysis of the interaction among the antenna array with objects in the surrounding environment, located at an intermediate distance comprised in the range from tens to hundreds of wavelengths. This distance is usually too large to consider the object in the near field region and to include the object in the same work space of the antenna. Moreover, in this part of the work, we use Time Domain Solver because signal processing will include transit time calculation and auto-correlation in order to have an estimation of the position, the material and maybe also the shape possible obstacles. To overcome the problem related to the numerical analysis of large volumes containing objects with small geometrical details (the antennas) we tried to analyse using far field plane wave decomposition, but this method gives some inconsistencies even scaling the frequency down to 10 GHz. Finally we tried to separate the whole problem into two simpler sub-problems, possibly having different meshes, using the field source utility, an implementation of Equivalence Theorem, that is available into CST Microwave Studio 2010. Preliminary result will be shown at CST User Group Meeting.

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