标题： 无线多端口传感：虚拟VNA启用的空中夹具去嵌入 显示英文标题

标题： Wireless Multi-Port Sensing: Virtual-VNA-Enabled De-Embedding of an Over-the-Air Fixture

摘要： 我们开发了一种多端口背散射调制技术，以在空中（OTA）确定被测线性、无源、时不变多端口设备（DUT）的散射参数。一组“无法直接访问”（NDA）天线可以在由DUT终止或由特定、已知、可调负载网络终止之间切换。可以通过一组不同的“可访问”天线辐射和捕获波，这些天线将OTA耦合到NDA天线。首先，我们对可访问天线端口与DUT端口之间的OTA夹具进行表征。我们基于我们最近引入的“虚拟VNA”技术；具体来说，我们将NDA天线连接到可调负载网络，并测量可访问天线端口在可调负载网络各种配置下的散射。其次，我们将NDA天线连接到DUT，并测量可访问天线端口的散射。第三，我们去嵌入OTA夹具以恢复DUT的散射参数。我们在2.45 GHz频率下对1端口DUT和5端口DUT进行了实验验证，考虑了混响室内的丰富散射OTA夹具。我们系统地研究了可访问天线数量以及系统模型的各种可能简化以及可调负载网络属性的影响。我们的无线多端口传感技术可以在RFID和无线生物电子学等领域找到应用。 显示英文摘要

摘要： We develop a multi-port-backscatter-modulation technique to determine, over the air (OTA), the scattering parameters of a linear, passive, time-invariant multi-port device under test (DUT). A set of "not-directly-accessible" (NDA) antennas can be switched between being terminated by the DUT or by a specific, known, tunable load network. Waves can be radiated and captured via a distinct set of "accessible" antennas that couple OTA to the NDA antennas. First, we characterize the OTA fixture between the accessible antennas' ports and the DUT's ports. We achieve this based on our recently introduced "Virtual VNA" technique; specifically, we connect the NDA antennas to the tunable load network and measure the scattering at the accessible antennas' ports for various configurations of the tunable load network. Second, we connect the NDA antennas to the DUT and measure the scattering at the accessible antennas' ports. Third, we de-embed the OTA fixture to retrieve the DUT's scattering parameters. We experimentally validate our technique at 2.45 GHz for 1-port DUTs and 5-port DUTs, considering a rich-scattering OTA fixture inside a reverberation chamber. We systematically study the influence of the number of accessible antennas and various conceivable simplifications in terms of the system model as well as the properties of the tunable load network. Our wireless multi-port sensing technique can find applications in areas like RFID and wireless bioelectronics.