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Side looking airborne radar [1] 

Side looking airborne radar [1] 

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Frequency Modulated Continuous Wave (FMCW) radar uses continuous signal that can change its frequency along the measurement in its detection process. The developed FMCW radar will be combined with Synthetic Aperture Radar (SAR) technology that uses signal processing algorithm to improve the resolution of the output image beyond the limitation of ph...


... Vivaldi antenna has wider BW and broader frequency band than Quasi-Yagi antenna. However, Quasi-Yagi antenna provides higher gain, more compact size, and lighter weight than Vivaldi antenna [38]. Another advantage of the endfire antennas that makes them suitable for planar Rotman lens is their main radiation is less affected by the unwanted radiations, emitted by twisted transmission lines of the array or beam port sides than the broadside antennas, especially at mmWave frequency band. ...
A broadband high-gain millimeter-wave (mmWave) array beamforming network (BFN) design, analysis, and implementation based on the Rotman lens antenna array feeding are presented. The BFN is intended for operation in the (26–40) GHz frequency band for a wide range of potential applications in the fifth generation (5G). The system is made on Rogers substrate, RO6010, to provide compatibility with standard planar low-cost processing techniques for millimeter-wave monolithic integrated circuit (MMIC). The measured results show the system capability of 80° beam scanning for different angles at −39.7°, −26.5°, −13.3°, 0°, +13.3°, +26.5°, and +39.5° at 28 GHz. With these features in addition to being compact size, low profile, and lightweight, this BFN is suitable for various millimeter-wave and 5G applications such as the advanced multi-in multi-out (MIMO) systems, remote sensing, and automotive radar.