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We investigate a pointing and tracking approach for an OAM multiplexing free-space communication link based on the measurement of the intensity gradient of the received beam. The OAM intensity gradient-based approach may potentially improve the system's tracking accuracy.
In this paper, a design concept of sparse array is applied to total focusing imaging technique. During the process, the elements of a phased array are partially selected according to the theory of effective aperture, in order to reduce the amount of captured data and shorten the processing time of TFM imaging. Simulated imaging with Field II program and experimental verification on two standard phased...
A Ka-band reflectarray consists of modified cross loop is investigated in this paper. The reflectarray consists of 30 × 30 unit cells and covering an area of 15cm × 15 cm. The unit cell is composed of a solid cross inside and a cross loop outside. Varying the lengths of the cross can lead to nearly 550o linear phase shift curve. Using this technique, a single layer reflectarray that has a wider bandwidth...
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