A millimeter-wave quasi-optical grid phase shifter using liquid crystal
A millimeter-wave quasi-optical grid phase shifter using liquid crystal
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DOI：
10.1587/elex.7.67
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
T. Nozokido;Satoshi Maede;N. Miyasaka;H. Okada;T. Nose;T. Murai
中科院分区：
文献类型：
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作者：
T. Nozokido;Satoshi Maede;N. Miyasaka;H. Okada;T. Nose;T. Murai
提出了一种利用液晶材料介电各向异性的毫米波准光可变移相器。该器件在传输模式下工作，由电感和电容金属网格组成，每个金属网格在介电基板上形成图案，并由LC薄层隔开。栅极与LC一起形成并联谐振电路。设计并制造了具有25 μ m厚LC层的原型器件，用于50 GHz的毫米波频率。在U波段进行的实验表明，在20 V的控制信号下，在谐振频率处获得了7.8°的相移，插入损耗为± 0.6dB。该器件具有良好的时间响应特性。建议通过使用具有较大介电各向异性和/或较薄介电衬底的LC材料，可以进一步增强与器件可获得的相移。
A new type of millimeter-wave quasi-optical variable phase shifter which exploits the dielectric anisotropy of liquid crystal (LC) materials is presented. The device is operated in transmission mode and consists of inductive and capacitive metal grids, each patterned on a dielectric substrate, which are separated by a thin layer of LC. The grids together with the LC form a parallel resonant circuit. Prototype devices with a 25-µm-thick LC layer for use at a millimeter-wave frequency of 50GHz were designed and fabricated. Experiments performed at U-band frequencies show that a phase shift of 7.8° is obtained with a low insertion loss of ∼ 0.6dB at the resonant frequency by applying a control signal of 20V. Good time response for the device is demonstrated. It is suggested that the phase shift attainable with the device can be further enhanced by using LC materials with larger dielectric anisotropy and/or thinner dielectric substrates.