Resonant waveguide cavity system for complex permittivity measurements
US11650168B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2020 |
| Grant date | May 16, 2023 |
| Priority date | — |
| Expiry date | Sep 18, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P7/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of using a resonant cavity for measuring a complex permittivity ε and identifying of a sample (solid or liquid) of microliter volume size includes using a network analyzer to measure over a defined millimeter wave frequency range, a first resonance frequency at a cavity resonance mode, and calculating an unloaded quality factor of an enclosed resonant waveguide cavity of a defined internal dimensions, placing a sample on a surface of a bottom wall of the resonant waveguide cavity and measure a second resonance frequency and calculating a loaded quality factor; determining, a resonance frequency shift Δf=(fs−fo), determining a complex permittivity ε of the sample according to the resonance frequency shift Δf, the loaded quality factor, the unloaded quality factor and the defined internal dimensions; and identifying the sample using a database through the complex permittivity ε.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.