Abstract
Switched beam antennas provide an efficient and cost effective alternative to complex phased array and digital beam forming techniques. In this paper, we present the design and characterization of an electrically thin Huygens metasurface lens operating at 83GHz with high transmission efficiency and we demonstrate its applicability to switched beam antenna applications. We accurately characterize the 3D scattered field distribution and determine the focal length and transmission efficiency of the lens by near-field scanning. A model based on ideal Huygens sources is used to predict the focal performance, allowing the geometrical measurement parameters to be determined in advance. Finally, the ability of the lens to operate as a switched beam antenna is experimentally verified by exciting it with an omnidirectional waveguide antenna placed at different positions. The experimental results are in very good agreement with numerical simulations, showing steering angles up to 12° while keeping the side lobe level below -15dB.
Highlights
M ETASURFACES have been shown to enable versatile wavefront transformation, especially at microwave frequencies [1], [2]
We design and characterize a flat Huygens metasurface lens operating at 83 GHz with high transmission efficiency, and we investigate its applicability to switched beam antennas
We presented the design and the characterization of a Huygens metasurface lens operating at 83 GHz with high transmission and demonstrated its applicability as integral part of a switched beam antenna
Summary
M ETASURFACES have been shown to enable versatile wavefront transformation, especially at microwave frequencies [1], [2]. They can enhance the directivity of antennas [3], [4], provide polarization control [5]–[8] and enable reconfigurability [9], [10]. By changing the lateral position of the source, the direction of the radiated wave can be controlled. Since in practice it is often implemented with multiple source antennas connected to the transmitter by RF switches, this configuration is referred to as a switched beam antenna
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