Abstract
This paper proposes a design of a high-gain slotted array waveguide antenna of a radar system to prevent accidents at sea. The proposed antenna has a reduced size, 2−3, of the broad wall length and the narrow wall length of the WR-51 standard waveguide. To realize a low profile and high gain in comparison with the WR-51 standard waveguide slotted array antenna, the parameters, such as the slot length, width, offset, and distance between slots, were precisely calculated using the iterated simulations. The reflection coefficients and radiation patterns of the proposed antenna corresponded with the characteristics of the WR-51 standard waveguide antenna. The measured reflection coefficients and radiation patterns of the fabricated prototype antenna conformed with that of the simulated ones. The peak gains measured at the targeting frequency band were observed at 28 dBi, which were less than approximately 1 dBi of the simulated gains.
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