Robotically‐controlled antenna measurement system for millimeter‐wave applications

Abstract

The characterization of antenna radiation patterns in millimeter-wave (mmW) bands can be particularly challenging. Due to a small wavelength, minute misplacement of the probe antenna in the order of few millimeters can generate substantial errors in the measured pattern. A highly precise measurement system that incorporates a 6-axis compact robotic arm is implemented to overcome this challenge. System testing shows a positional accuracy and repeatability of approximately 20 μm or 0.004λ at 60 GHz. After implementation, programming, and testing, the system is used to measure gain patterns on three different mmW antennas. The radiation pattern of a 50-75 GHz standard gain horn antenna demonstrated the accurate measurement at the far-field using the robotically controlled system. Furthermore, the characterization of the center element pattern of a 60 GHz phased array has shown that the measurements with this system are repeatable and suitable for arrays as well. Additionally, we performed near-field measurements by successfully characterizing a 40-60 GHz horn antenna with a planar scan.

Exploiting Nonlinear Properties of Vo2 in a Mmwave Antenna-Coupled Sensor

“…Therefore, in a full ROIC-controlled device, initial impedance of VO2 can be set to ~75  using temperature and DC voltage; this impedance will then fluctuate according to power level of incoming RF signal. As shown in Figure 5, we utilize a 6-axis robot system (Fanuc LR Mate200iD) developed in our previous study [16] with a dual-horn monostatic radar setup to measure radiation pattern. The standard gain horn antennas (QSH-SL-50-75-V-20) are used to establish signal floor by scanning the test setup without the microbolometer array in place.…”