Air-bridged Schottky diodes for dynamically tunable millimeter-wave metamaterial phase shifters.
Air-bridged Schottky diodes for dynamically tunable millimeter-wave metamaterial phase shifters.
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DOI：
10.1038/s41598-021-85565-z
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发表时间：
2021-03-16
影响因子：
4.6
通讯作者：
Feresidis A
中科院分区：
文献类型：
--
作者：
Vassos E;Churm J;Powell J;Viegas C;Alderman B;Feresidis A
提出了一种低损耗的超材料单元，该单元集成了GaAs空气桥肖特基二极管，以产生动态可调的反射式移相器，该移相器能够实现高达250°的相移，在V波段实验测量的平均损耗为6.2 dB。空气桥接肖特基二极管在施加的反向电压偏置下提供在30和50 fF之间的范围内的可调谐电容。这可以用于改变周期性超颖表面的分裂贴片单位单元的谐振频率和相位响应。空气桥接二极管芯片倒装焊接到贴片上，具有超低的寄生电容和电阻。模拟和测量结果验证了在毫米波频率下实现可接受损耗的二极管开关速度的潜力。此外，该研究表明，这种基于二极管的单位单元可以集成到超材料组件中，这些超材料组件在未来的毫米波天线波束转向，6G通信的智能反射表面，反射阵列，发射阵列或全息天线中具有潜在的应用。
A low loss metamaterial unit cell is presented with an integrated GaAs air-bridged Schottky diode to produce a dynamically tunable reflective phase shifter that is capable of up to 250° phase shift with an experimentally measured average loss of 6.2 dB at V-band. The air-bridged Schottky diode provides a tuneable capacitance in the range between 30 and 50 fF under an applied reverse voltage bias. This can be used to alter the resonant frequency and phase response of a split patch unit cell of a periodic metasurface. The air-bridged diode die, which is flip-chip soldered to the patch, has ultra-low parasitic capacitance and resistance. Simulated and measured results are presented which verify the potential for the attainment of diode switching speeds with acceptable losses at mmWave frequencies. Furthermore the study shows that this diode-based unit cell can be integrated into metamaterial components, which have potential applications in future mmWave antenna beam-steering, intelligent reflecting surfaces for 6G communications, reflect-arrays, transmit-arrays or holographic antennas.
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