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A Talai, R. Weigel, K. Kölpin, F. Steinhäußer, A. Bittner, U. Schmid:
"The Influence by Trapezoidal Conductor Shapes on Ring-Resonator Based Material Characterization up to 110 GHz";
Talk: IEEE Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave and Terahertz Applications 2014, Pavia, Italien; 05-14-2014 - 05-16-2014; in: "IEEE Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave and Terahertz Applications 2014", IEEE, (2014), ISBN: 978-1-4799-2820-0; 1 - 4.

Material characterization by ring-resonator based
measurements is well established since the early 20th century.
Since then, the demand on spectral complex permittivity char-
acterizations of RF materials and dielectric covers at higher
microwave frequencies rises. Nowadays, both free space applica-
tions, e.g. 77 GHz automotive radar systems, and dielectrics for
microchip packages require accurate knowledge of the relative
permittivity in order to optimize RF circuit designs. With
increasing frequencies, the conductor shape of photochemically
etched ring-resonators gets more influence on the effective ring
radius, and therefore the measured resonance frequencies, which
results in an error for the relative permittivity determination.
This paper provides correction factors for the ring radii up
to 110 GHz, compensating the altered field distribution due to
trapezoidal edges.

Material characterization by ring-resonator based
measurements is well established since the early 20th century.
Since then, the demand on spectral complex permittivity char-
acterizations of RF materials and dielectric covers at higher
microwave frequencies rises. Nowadays, both free space applica-
tions, e.g. 77 GHz automotive radar systems, and dielectrics for
microchip packages require accurate knowledge of the relative
permittivity in order to optimize RF circuit designs. With
increasing frequencies, the conductor shape of photochemically
etched ring-resonators gets more influence on the effective ring
radius, and therefore the measured resonance frequencies, which
results in an error for the relative permittivity determination.
This paper provides correction factors for the ring radii up
to 110 GHz, compensating the altered field distribution due to
trapezoidal edges.

CAD Modeling, Effective Permittivity, Field Simulation, Material Characterization, Microstrip Structure, Ring-Resonator, Trapezoidal Conductor.