TE01δ mode dielectric resonator technique
is intended for very precise complex permittivity
measurements of bulk low loss disc or cylinder shape
dielectric ceramics. Additionally, with this technique the
thermal coefficients of permittivity and the dielectric loss
tangent can be measured. With this application QWED offers
dedicated software for the rigorous computations of the
complex permittivity as well as cavities of different size with
adjustable coupling mechanisms and low loss dielectric
All TE01δ mode dielectric resonator cavities
are custom made.
|Accuracy of measurements of a sample of thickness h and diameter d||Δε/ε=T*Δh/h+(2-T)*Δd/d
for 0 < T < 2
Δtanδ=±2*10-6 or ±0.03*tanδ
|Operational frequency range||
Measurement frequency depends on the diameter, height and
permittivity of the sample under test, and for typical samples
is in the range of 1 ÷ 10 GHz. Measurements at higher
frequencies are possible by employing either smaller cavities
and samples or higher order quasi TE0mn modes.
|Operational temperature range||-2700C÷1100C|
|Additional equipment needed to perform measurement||Vector Network Analyser|
To obtain the highest precision of the measurements, the size
of the sample under test should be in the range of 0.25÷0.6
of the size of the cavity (for both dimensions: diameter and height).
Sample under test is placed in a metal cavity on a low loss
dielectric support. Resonant frequency and Q-factor of the
TE01δ are measured. Dedicated software is provided for
permittivity and dielectric loss tangent determination.