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The present-day trend in automobile radar is toward the millimetre-wave technology which have the effect of increasing visibility in the road traffic. But despite the obvious benefits for the traffic safety, the high cost presents a serious deterrent to this millimetre-wave application. Even with a certain improvement in cost of some signal processing and functional units utilizing solid-state components, the planar small-size antennas remain too complex and expensive, sending us in search of new millimetre-wave antenna designs and calculation algorithms.