High-precision Measurement of the Radiation Patterns of Small Antennas by an S-Parameter Method Using a Photodiode Module

This paper proposes an S-parameter method using a small PhotoDiode module for improving precision of radiation pattern measurement. The effects of structure for measurement are reduced compared to the measurement system with the conventional method by using the RF cable of the minimum necessary length and the PhotoDiode module. We verify the effectiveness of the proposed method by the measurement of a small bent monopole antenna.