Reconfigurable Diffractive Antenna Based on Switchable Electrically Induced Transparency
Reconfigurable Diffractive Antenna Based on Switchable Electrically Induced Transparency
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基于可切换电感应透明度的可重构衍射天线
DOI：
10.1109/tmtt.2015.2393862
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发表时间：
2015-03-01
影响因子：
4.3
通讯作者：
Ran, Lixin
中科院分区：
文献类型：
--
作者：
Li, Huan;Ye, Dexin;Ran, Lixin
耦合电磁共振在微波工程中具有各种重要的应用。其中，新发现的电磁感应透明（EIT）引起了人们的广泛兴趣。在本文中，我们探索使用可配置的电感应透明度来构建微波“衍射介质”，其类空气最佳匹配透明度和类金属最佳反射不透明度可以通过二元直流电压方便地切换。与基于紧密耦合谐振的 EIT 不同，我们使用解耦电感应谐振来实现低损耗透明度以及与空气的最佳阻抗匹配。在满足无损完美匹配层的条件下，可以在宽范围的入射角下获得这样的透明度和不透明度。我们通过实验演示两个基于衍射光栅效应的电控转向天线来验证我们的方法，两者都具有薄平面孔径和二进制数字控制电路。所提出的方法可以扩展到更高的频率，实现毫米波和太赫兹频率的可配置衍射装置。
Coupled electromagnetic resonances have various important applications in microwave engineering. Among them, the newly discovered electromagnetically induced transparency (EIT) has attracted much interest. In this paper, we explore the use of configurable electrically induced transparency to construct a microwave “diffractive medium” whose air-like optimally matched transparency and metal-like optimally reflective opacity can be conveniently switched by a binary dc voltage. Different from EITs based on closely coupled resonances, we use decoupled electrically induced resonances to achieve a low-loss transparency along with an optimal impedance matching with air. Satisfying the condition of a lossless perfectly matched layer, such transparency and opacity can be obtained in a wide range of incident angles. We validate our approach by experimentally demonstrating two electrically controlled steering antennas based on diffractive grating effect, both with thin planar apertures and binary digital control circuits. The proposed approach can be extended to higher frequencies, achieving configurable diffractive devices at millimeter-wave and terahertz frequencies.