Abstract-This paper presents a design of a dual-orthogonal, linear polarized antenna for the IR-UWB technology in the frequency range from 3.1 GHz to 10.6 GHz. The antenna is compact with dimensions of 40x40 mm of the radiation plane, which is orthogonal to the radiation direction. Both, the antenna and the feeding network are realized in planar technology. The radiation principle and the computed design are verified by a prototype. The input impedance matching is better than -6 dB. The measured results show a mean gain in co-polarization close to 4 dBi. The cross polarizations suppression w.r.t. the copolarization is better than 20 dB. Due to its features the antenna is suited for polarimetric ultra wideband radar and ultra wideband MIMO applications.

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Abstract-An antenna concept for compact millimeter-wave radar sensors that desire a fan-beam radiation pattern is proposed. It combines an end-fire antenna on a ceramic substrate with a cylindrical parabolic reflector that can be integrated in the sensor's metal housing. The concept allows a direct interconnection from the active components to the antenna in a flip-chip attachment. It is validated with a 77-GHz Yagi-Uda antenna on a 127-m thick Alumina substrate by measurements with a probe-based measurement setup. The measured return loss, gain, and radiation patterns of the antenna without and with the reflector are given.Index Terms-End-fire antennas, millimeter-wave antennas, millimeter-wave radar, radar antennas, reflector antennas.

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