Electronically controlled metamaterial-based leaky-wave transmission-line for conformal surface applications
Electronically controlled metamaterial-based leaky-wave transmission-line for conformal surface applications
复制标题
用于共形表面应用的基于电子控制超材料的漏波传输线
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
T. Itoh
中科院分区：
文献类型：
--
作者：
M. R. Hashemi;T. Itoh
提出了一种新型的多功能电控共形超材料传输线。所提出的结构是一个25个单元的复合右手/左手(CRLH)TL，它被整合在半径为25 cm的圆柱面上。该TL在其基模工作时既支持导波模式又支持辐射模式。在单元电池中引入了变容二极管，以电子控制其导波和辐射特性。通过施加不同的反向偏置电压，可以调节单位电池的电容。结果表明，通过对TL的不同部分施加适当的偏置电压，所提出的TL具有部分在慢波(SW)区和部分在快波(FW)区工作的能力。因此，它具有独特的辐射孔径选择功能，从而将辐射角和波束宽度控制在固定频率。此外，通过适当调整偏置电压，这种电控共形CRLHTL具有补偿构象效应的能力。所提出的方法允许共形结构对其辐射主束进行重新聚焦，并且具有与平面形式相当的性能。
In this paper a novel multifunctional electronically controlled conformal metamaterial-based transmission-line (TL) is presented. The proposed structure is a 25 unit-cell composite right/left-handed (CRLH) TL that is conformed on a cylindrical surface with a radius of 25 cm. This TL supports both guided-wave mode and radiation mode under its fundamental mode operation. Varactor diodes are introduced in the unit-cells to electronically control its guided and radiation characteristics. By applying different reverse-bias voltages the capacitance of the unit-cell is tuned. It will be shown that the proposed TL has the ability to operate partially in the slow-wave (SW) region and partially in the fast-wave (FW) region by applying proper biasing voltages to the different sections of the TL. Therefore, it has a unique radiation aperture selectivity function which results in controlling the radiation angle and beamwidth at a fixed frequency. In addition it will be shown that this electronically controlled conformal CRLH TL has the capability to compensate for the conformation effect by adjusting the biasing voltages properly. The proposed method allows the conformal structure to refocus its radiation main beam and have a comparable performance as the planar version.