Wideband Radiation Pattern Measurement of Terahertz Antenna-Integrated Photodiodes by Frequency-Domain Spectroscopy

Abstract

In this paper the potential of terahertz frequency-domain spectroscopy (THz-FDS) for wideband radiation pattern measurements of terahertz antennas is demonstrated. To this end, radiation patterns of a commercially available bowtie antenna-integrated photodiode are measured with a frequency resolution of 250MHz from 100 to 400 GHz. Parasitic translation of the antenna during its rotation can be accurately resolved and compensated. Furthermore, by analysis in the time domain, the measurement setup can be examined for unwanted scatterers.