Waveguide type dielectric resonators - Part 1-4: General information and test conditions - Measurement method of complex relative permittivity for dielectric resonator materials at millimetre-wave frequency
This part of IEC 61338 describes the measurement method of dielectric properties for dielectric resonator materials at millimetre-wave frequency.
This standard consists of two measurement methods: a) the dielectric rod resonator method excited by NRD-guide (Non-Radiative Dielectric waveguide) and b) the cut-off waveguide method excited by coaxial cables with small loops.
a) The dielectric rod resonator method excited by NRD-guide is similar to the dielectric rod resonator method given in IEC 61338-1-3. This method has the following characteristics:
- a complete and exact mathematical solution of complex permittivity is given by computer software;
- the measurement error is less than 0,3 % for s' and less than 0,05 x 10-4 for tan 8;
- the applicable measuring ranges of complex permittivity for this method are as follows: frequency: 30 GHz < 100 GHz;
relative permittivity: 2 < e' < 30;
loss factor: 10~6 < tan 8 < 10~2.
b) The cut-off waveguide method excited by coaxial cables with small loops uses a dielectric plate sample placed in a circular cylinder of the TE011 mode. This method has the following characteristics:
- fringe effect is corrected using the correction charts on the basis of rigorous analysis;
- the measurement error is less than 0,5 % for £' and less than 0,05 x10-4 for tan 8;
- the TCF is measured with high accuracy;
- the applicable measuring ranges of dielectric properties for this method are as follows: frequency: 30 GHz < 100 GHz;
relative permittivity: 2 < s' < 30;
loss factor: 10~6 < tan <5 < 10~2.