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Multidirectional antennas are one of the enabling technologies for the widespread diffusion of intelligent vehicles, which are expected to fill smart cities in the near future characterized by the fifth generation cellular system (5G). In this context, this paper proposes a simple and versatile design procedure for a feeding network, that realizes the beam steering of linear antenna arrays. The developed procedure is intended for a feedline, which must meet some requirements typical in a 5G scenario, such as, for example, easy mass production, low cost, easy integration with other system components and compactness. Precisely, a Blass matrix using the microstrip technology and identical branch line directional couplers is implemented, so that the multidirectional antenna system can be entirely printed on a compact and cheap printed circuit board (PCB). However, when the coupling value is fixed in advance, some pointing directions may be not realizable. So, this paper proposes an algorithm, which evaluates a desired number of beams, in such a way to have a simple design procedure of a feeding network for a multidirectional linear antenna array. The effectiveness of the developed solution is validated by numerical results.

Abstract-Integrated optical systems that perform automated collection of spectra and provide diagnostic information in vivo in real time is a challenge for modern medicine. This work aimed to automate the spectra collection of a dispersive Raman spectrometer for use in skin cancer diagnosis in vivo. The routine of data collection, storage, preprocessing and processing of spectral data was developed under the LabVIEW environment, which controls the excitation, spectrometer, pre-processing signals and spectral analysis in real time. This provided reliable diagnostic information, offering the possibility of routine use in clinical diagnosis and in supporting histopathological evaluation for neoplastic skin lesions.