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605 610 53 5 ; S ; [EN] This paper introduces a slotted empty substrate integrated waveguide (ESIW) antenna for a multiple-input multiple-output (MIMO) radar sensor. The proposed system is based on the MIMO radar architecture. Orthogonal signals are sent from the transmitters, in such a manner that a MIMO image reconstruction is possible. The presented system application targets the surveillance of strategic areas in gas pipelines and nuclear plants. ESIW technology enables a high-efficiency, low-profile, and compact antenna for these MIMO systems. The fabricated device includes a transition to microstrip line, and, in consequence, the antenna can be integrated with the rest of the system in a standard integrated circuit. The slotted ESIW antenna design and measured results for the targeted application are presented in this paper. The measured results present a gain greater than 15 dBi and return loss below ¿13 dB over the targeted frequency band of operation (16¿16.5 GHz). To the best of the authors¿ knowledge, this is the first slotted ESIW antenna reported in the scientific literature up to now. This work was supported by the Ministerio de Economia y Competitividad, Spanish Government, under research projects TEC2016-75934-C4-3-R and TEC2016-75934-C4-1-R. Miralles-Navarro, E.; Belenguer Martinez, A.; Mateo Sotos, J.; Torres Aranda, AM.; Esteban González, H.; Lucas Borja, A.; Boria Esbert, VE. (2018). Slotted ESIW Antenna with high efficiency for a MIMO Radar Sensor. Radio Science. 53(5):605-610. https://doi.org/10.1002/2017RS006461

This paper deals with the accurate and efficient modal analysis of arbitrarily shaped waveguides whose cross section is defined by a combination of straight, circular, and/or elliptical arcs. A novel technique for considering the presence of circular and/or elliptical segments within the frame of the well-known boundary integral-resonant mode expansion (BI-RME) method is proposed. This new extended BI-RME method will allow a more accurate solution of a wider number of hollow conducting waveguides with arbitrary profiles, which are usually present in most modern passive waveguide components. To show the advantages of this new extended technique, the modal chart of canonical (circular and elliptical) waveguides, as well as of irises with great practical interest (i.e., cross-shaped irises with rounded corners) has been first successfully solved. Next, a computer-aided-design software package based on such a novel modal analysis tool has first been validated with the accurate analysis of a referenced complex dual-mode filter, and then applied to the complete design of a novel twist component for K-band application based on circular and elliptical waveguides. A prototype of this novel device has been manufactured and measured for verification purposes. ; This work was supported by the European Commission under the Research and Training Networks Programme Contract HPRN-CT-2000-00043, and by the Ministerio de Ciencia y Tecnología, Spanish Government, under Research Project TIC2000-0591-C03-01 and Research Project TIC2000-0591-C03-03.