Segmented Iris Coupling Loops for Wider Microwave QL Range
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Solution Overview
Problem
Existing microwave coupling devices for EPR spectroscopy have limited dynamic range and maximum magnetic field strength at the iris opening, restricting the variability of the loaded quality factor (QL) and coupling efficiency between microwave waveguides and resonant cavities.
Innovation Solution
A coupling device with N electrically conducting conductor loops arranged coaxially along the z-axis, separated by dielectric material, which redistributes microwave magnetic field lines to increase the magnetic field strength at the iris opening, allowing for a higher coupling coefficient and dynamic range by forming induced secondary loops and allowing radial magnetic field penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single metallic coupling device is used in front of the iris opening, then the magnetic field strength can be increased to improve coupling, but the dynamic range of the loaded quality factor is limited
Solution Approach 1:
The coupling device is segmented into N conductor loops (3≤N≤20) arranged coaxially along the z-axis, with dielectric material between adjacent loops. This segmentation allows the magnetic field to be distributed and redistributed across multiple loops, increasing both the maximum magnetic field strength at the iris opening and the dynamic range of the loaded quality factor by enabling more granular control over field distribution.
2Ease of operation
If a movable coupling device is used to alter loaded quality factor, then positioning flexibility is improved, but the maximum magnetic field strength achievable is still limited
Solution Approach 1:
The coupling device combines conductor loops with dielectric material between them, creating a composite structure. The dielectric material enhances the magnetic field concentration effect while the conductor loops provide the necessary inductance and field distortion, together achieving higher maximum magnetic field strength at the iris opening compared to pure metallic structures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves higher maximum magnetic field strength (Bmax) and a larger dynamic range of QL values, enabling optimized measurement conditions for both CW-EPR and Pulse-EPR spectroscopy by efficiently redistributing microwave magnetic field lines and maintaining manufacturing tolerance compatibility.
Implementation Method 1
the conductor loops are arranged coaxially in an array along a z-axis... which redistributes microwave magnetic field lines to increase the magnetic field strength at the iris opening, allowing for a higher coupling coefficient
Implementation Method 2
axially neighboring conductor loops are separated by a dielectric... allowing radial magnetic field penetration
Data Source
AI summary
A coupling device is provided for coupling microwave radiation from a first microwave structure, in particular a microwave waveguide, into a second microwave structure, in particular a microwave resonant cavity, wherein the first and second microwave structures share a common wall, through an iris opening in said wall in front of which the coupling device is positioned on the side of the first microwave structure, in particular wherein the coupling device is of a basically cylindrical shape, characterized in that the coupling device comprises N electrically conducting conductor loops, with N≥3, preferably 3≤N≤20, that the conductor loops are arranged coaxially in an array along a z-axis, and that axially neighboring conductor loops are separated by a dielectric. The inventive coupling device allows for a larger coupling coefficient, and in particular allows for a larger dynamic range.