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We present a short-range experimental orbital-angular-momentum (OAM) multiplexing millimeter-wave communication system using patch antenna arrays. The dependence of the evolution of OAM beams on the number of array elements and array radius are analyzed. We also find phase delay deviation of 30 degrees leads to mode purity degrading to ∼1% and power deviation of 6 dB reduces the purity by <40%...
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.
A two-dimensional Luneberg lens designed using a symmetrical metamaterial cell to operate a wide frequency band covering 8GHz–12GHz is proposed and studied. The proposed Luneberg lens is composed of an array of complementary circle cells and embedded in a parallel-plate TEM waveguide. Due to high resonant frequency of the complementary circle cell, the equivalent refractive index is nearly constant...
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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