Voltage-Controlled Polarization at 0.1 THz Based on Phase-Tuned Coupled Oscillation via a Magic Tee
Voltage-Controlled Polarization at 0.1 THz Based on Phase-Tuned Coupled Oscillation via a Magic Tee
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DOI：
10.1109/tthz.2022.3191233
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发表时间：
2022-11
影响因子：
3.2
通讯作者：
Keisuke Sasao;Y. Monnai
中科院分区：
文献类型：
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作者：
Keisuke Sasao;Y. Monnai
我们提出了一种技术，以实现电压控制的极化在0.1太赫兹使用一对相位调谐的古恩二极管振荡器耦合通过一个WR10魔术三通混合耦合器。通过用偏置电压微调自激振荡频率，我们可以控制两个耦合振荡器之间的相位差。由于混合耦合器的两个输出端口对应于来自两个耦合振荡器的信号的和与差，因此可以通过调谐两个输出端口之间的相位差来任意调整两个输出端口之间的功率比。因此，通过将一对正交喇叭天线连接到输出端口，可以获得任意极化比。在这项研究中观察到的最大偏振比为31.8 dB。为了在垂直和水平方向之间完全切换极化，当改变两个振荡器之一的偏置电压时，涉及在约94.3GHz处的26.6MHz（0.03%）的频移。这种频率偏移可以通过同时小心地控制两个振荡器的偏置电压来补偿。所提出的方法能够使用波导平台对亚太赫兹波的偏振进行完全电气控制，这对于传感和通信中的各种应用都具有重要意义。
We propose a technique to implement voltage-controlled polarization at 0.1 THz using a pair of phase-tuned Gunn diode oscillators coupled through a WR10 magic tee hybrid coupler. By finely tuning the free-running oscillation frequency with bias voltage, we can control the phase difference between the two coupled oscillators. Since the two output ports of the hybrid coupler correspond to the sum and difference of the signals from the two coupled oscillators, the power ratio between the two output ports can be adjusted arbitrarily by tuning their phase difference. Thus, by connecting a pair of orthogonal horn antennas to the output ports, an arbitrary polarization ratio can be obtained. The maximum polarization ratio observed in this study is 31.8 dB. To fully switch the polarization between the vertical and horizontal directions, a frequency shift of 26.6 MHz (0.03%) at around 94.3 GHz is involved when changing the bias voltage of one of the two oscillators. This frequency shift could be compensated by carefully controlling the bias voltages of the two oscillators simultaneously. The proposed approach enables fully electrical control of the polarization of subterahertz waves using a waveguide platform, which will be of importance for a variety of applications in sensing and communication.