Antennas Measurement for Millimeter Wave 5G Wireless Applications Using Radio Over Fiber Technologies

We have developed an all-optical fiber link antenna measurement system for a millimeter wave 5th generation mobile communication frequency band around 28 GHz. Our developed system consists of an optical fiber link an electrical signal transmission system, an antenna-coupled-electrode electric-field (EO) sensor system for 28 GHz-band as an electrical signal receiving system, and a 6-axis vertically articulated robot with an arm length of 1 m. Our developed optical fiber link electrical signal transmission system can transmit the electrical signal of more than 40 GHz with more than 30 dBm output level. Our developed EO sensor can receive the electrical signal from 27 GHz to 30 GHz. In addition, we have estimated a far field antenna factor of the EO sensor system for the 28 GHz-band using an amplitude center modified antenna factor estimation equation. The estimated far field antenna factor of the sensor system is 83.2 dB/m at 28 GHz.