TSP #255 – Terahertz Material & Dielectric Characterization – EM Labs 330GHz Fabry-Perot Resonator

In this episode Shahriar takes a look at a terahertz characterization technique using a Fabry-Perot resonance chamber made by EM Labs:

https://www.emlabs.jp/en/1-8-fpr.php

The chamber is able to measure dielectric constant and loss tangent with remarkable accuracy and prevision, ideal for materials with tan δ (Df) of 0.01 or less. This tutorial and review video is organized as follows:

00:00 – Introductions
00:45 – Dielectric Constant theory, equations and practical importance
04:54 – Measurement techniques using S-Parameters and resonance chambers
08:16 – Fabry-Perot resonator techniques for accurate Dk & Df measurements
11:04 – THz measurement setup including Fabry-Perot resonator, Keysight Streamline VNA and VDI frequency extenders
13:36 – Design challenges and features of the EM Labs Fabry-Perot resonator
16:02 – Software setup, resonator calibration and preparations
19:22 – Preparing, aligning and measuring samples, organic PCB laminate and prepreg
23:19 – Measuring ultra-low loss materials in J-Band
24:21 – Analyzing anisotropic material properties as a function of orientation
26:27 – Concluding remarks

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