A three-dimensional antenna array for terahertz sensing

Linear and planar arrays have been demonstrated to be effective in interferometric imaging and sensing of one-dimensional and two-dimensional objects. A planar spiral array was used for sensing sources or objects located on a plane parallel to the array plane. This paper shows that by using a three-dimensional array, it is possible to detect differences in distances and thus detect three dimensional objects more accurately. The concept is demonstrated for an array on an Archimedean spiral projection in the x-y plane and different functional variations in the z direction. A log-periodic variation in the z direction show better resolution of the image.