The influence by trapezoidal conductor shapes on ring-resonator based material characterization up to 110 GHz

Article Number
6995723
Citation
International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications, NEMO: 6995723 (2014-05)
Contribution to Conference
International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications, NEMO 2014  
Publisher DOI
10.1109/NEMO.2014.6995723
Material characterization by ring-resonator based measurements is well established since the early 20th century. Since then, the demand on spectral complex permittivity characterizations of RF materials and dielectric covers at higher microwave frequencies rises. Nowadays, both free space applications, 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.
Subjects
CAD Modeling
Effective Permittivity
Field Simulation
Material Characterization
Microstrip Structure
Ring-Resonator
Trapezoidal Conductor