This paper discusses the operating range of frequency modulated (FM) radars in the presence of interference. For this purpose, radar- and path loss equations are used to draw the equipotential lines for a given signal-to-interference ratio as a function of the spatial distribution of targets and interferers in order to identify relevant scenario constellations. Further the factors influencing the gain of signal versus deterministic interference are discussed based on measurements and simulations. Finally, the influence of different kinds of interference on the spectrum of a frequency modulated continuous wave radar is shown.

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This letter presents a realization method of reconfigurable antenna systems based on smart materials. The reconfigurability is obtained by utilizing shape memory alloy directors. This realization method offers a longer lifetime and lower energy consumption than conventional approaches such as microelectromechanical systems (MEMS) or p-i-n diodes. As a proof-of-concept, a compact reconfigurable antenna for the 2.6-GHz Long Term Evolution (LTE) band was designed. The designed antenna is a quasi-Yagi antenna with its directors made from shape memory alloy. This antenna is made to be installed in a standard car-roof antenna housing. A prototype of the antenna presented here has been fabricated and measured.Index Terms-Automotive antenna, reconfigurable antenna, shape memory alloy (SMA), smart materials, Yagi.