Study on Measurement Technique of Complex Permittivity Using Free-Space Method at Millimeterwave Frequencies in Anechoic Chamber

The free-space method is suitable for wide-band measurement in mobile communication systems. In this paper, we propose extending the free-space method based on transmitted characteristics with a horn antenna by 1) setting the material at far-field distances and the Fresnel zone, and 2) by applying a gating function to the S21 characteristics except in the range of ±0.005 ns from the first peak.