Abstract
In this paper, a tunable patch array based on high-order is proposed at the frequency of 300 GHz, achieving active controllable beam steering, focusing and generation of orbital angular momentum vortex beams. It has been demonstrated that the patch array can achieve wide beam scanning angle by controlling the phase of array elements with tunable phase shifters. Meanwhile, beam focusing on the specified position can also be realized by phase modulation of array elements based on the focusing theory. In addition, we also designed a patch array to generate vortex beams with multiple topological charges by high-order modes. The performances show that the patch antenna array we designed has a good application prospect.
Highlights
With the rapid development of modern wireless electronic technology, multiple functions should simultaneously exist in a single device to save resource and space, which raises the demand for multi-functional antennas
From an experimental point of view, 7×7 patch elements, phase shifters, bias voltage control circuits operating at high frequency and vector network analyzer are required
From an experimental point of view, 7 × 7 patch elements, phase shifters, bias voltage control circuits operating at high frequency and vector network analyzer are required
Summary
With the rapid development of modern wireless electronic technology, multiple functions should simultaneously exist in a single device to save resource and space, which raises the demand for multi-functional antennas Among all these functions, beam steering, focusing and generation of vortex beam are the most popular and related to the phase manipulation of the wavefront. The other is based on electrical scanning, whose principle is to achieve the angular deflection of the wavefront by electrical engineering the phase distributions This method is convenient and can be adopted by using various antenna structures, such as resonator cavity [4,5,6], reflect array [7,8,9,10], dipole antenna [11,12], and patch array [13,14,15]. The patch array antenna provides a simple solution with a low profile, compact size, low cost, and ease of integration with planar circuits [16]
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