Reconfigurable Folded Reflectarray Antenna Based Upon Liquid Crystal Technology
Reconfigurable Folded Reflectarray Antenna Based Upon Liquid Crystal Technology
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DOI：
10.1109/tap.2014.2367491
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发表时间：
2015-01-01
影响因子：
5.7
通讯作者：
Jakoby, Rolf
中科院分区：
文献类型：
--
作者：
Bildik, Saygin;Dieter, Sabine;Jakoby, Rolf
提出了一种基于液晶技术的可重构天线。该天线包括一个平面下反射器，在其中心有一个合并的馈电，在顶部有一个极化栅格作为上反射器。下反射镜用于准直光束和扭转偏振。偏振栅格选择用于透射的偏振，并将正交偏振的波反射向下部反射器。将反射器元件与偏振栅格相结合允许在上反射器上执行附加的相位调整以用于光束转向。可重构性由上反射器保持，其中液晶混合物用作可调谐基板。利用偏置电压配置来调谐液晶层，以获得用于光束转向的适当相位调整。作为概念证明，天线的波束转向能力通过在78 GHz下将主波束转向到-60度、0度和6度来证明。在78 GHz时测得的增益为25.1 dB。所提出的天线配置是一个很有前途的候选可重构，高增益，低剖面，低成本的天线。
A reconfigurable antenna based on the liquid crystal technology is presented in this paper. The antenna comprises a planar lower reflector with an incorporated feed at its center and a polarizing grid on top as an upper reflector. The lower reflector is utilized to collimate the beam and to twist the polarization. The polarizing grid selects the polarization for the transmission and reflects the orthogonally polarized waves toward the lower reflector. Combining reflector elements with a polarizing grid allows performing additional phase adjustment on the upper reflector for beam steering. Reconfigurability is maintained by the upper reflector, in which a liquid crystal mixture is used as a tunable substrate. The liquid crystal layer is tuned with a bias voltage configuration to obtain an appropriate phase adjustment for the beam steering. As a proof of concept, the beam steering capability of the antenna is demonstrated by steering the main beam to - 60 degrees, 0 degrees, and 6 degrees at 78 GHz. The measured gain at 78 GHz is 25.1 dB. The proposed antenna configuration is a promising candidate for reconfigurable, high-gain, low-profile, and low-cost antennas.