In recent years, the development of large capacity wireless communication technology using millimeter wave and terahertz wave has been remarkable. Especially for antennas, it is preferable to have a higher directivity and a higher gain. In this paper, we propose a dielectric cuboid antenna. For the proof-of-concept, we measured the radiation pattern of the dielectric cuboid antenna in the 24 GHz band and compeered it with that of a horn antenna with the same dimension.
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