A Millimeter-Wave Beam-Steering Lens Antenna With Reconfigurable Aperture Using Liquid Crystal
A Millimeter-Wave Beam-Steering Lens Antenna With Reconfigurable Aperture Using Liquid Crystal
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DOI：
10.1109/tap.2019.2918474
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发表时间：
2019-08-01
影响因子：
5.7
通讯作者：
Maune, Holger
中科院分区：
文献类型：
--
作者：
Reese, Roland;Jost, Matthias;Maune, Holger
本文首次研究了用于波束控制的液晶（LC）填充透镜天线。 LC 的各向异性应用于半圆形平行板波导内部，以实现传播电磁波在较低和较高介电常数界面处的偏转。使用电极网络，可以调整较高介电常数部分的方向，因此也可以调整光束方向。这种天线概念的主要优点是既不需要移相器也不需要开关网络，从而实现了一种非常简单的波束控制方法。第一个演示器在 50 至 75 GHz 的 V 频段运行，通过在 -30 度、0 度和 +30 度的预定义方向上重新配置波束来简化电极偏置网络，从而证明了天线概念。此外，调整波束宽度和生成多个波束是可行的并且正在被证明。在测量中，天线在整个频率范围内的测量输入反射低于 -10 dB。对于非转向辐射方向图，旁瓣电平在 -8 至 -12 dB 之间，而对于转向辐射方向图，这些值在 +/- 30 度处降级至 -4.5 至 -6 dB。测得的增益在 13 至 15 dBi 之间。
For the first time, a liquid crystal (LC) filled lens antenna is investigated for beam steering in this paper. The LC's anisotropy is applied inside a semicircular shaped parallel-plate waveguide to achieve a deflection of the propagating electromagnetic wave at the interface of lower and higher permittivities. Using an electrode network, the direction of the sector of higher permittivity can be adjusted and, therefore, so can the beam direction. The main advantage of this antenna concept is that neither phase shifters nor switching networks are needed, resulting in a very simple approach for beam steering. Operating at V-band, from 50 to 75 GHz, the first demonstrator proves the antenna concept by reconfiguring the beam in predefined directions of -30 degrees, 0 degrees, and +30 degrees to simplify the electrode biasing network. Furthermore, it is feasible and being demonstrated to adjust the beamwidth and to generate multiple beams. In the measurements, the antenna exhibits a measured input reflection below -10 dB over the complete frequency range. For the unsteered radiation pattern, the sidelobe level is between -8 and -12 dB, whereas these values degrade to -4.5 to -6 dB for the steered radiation pattern at +/- 30 degrees. The measured gain is between 13 and 15 dBi.