Multi-Width Choke Assembly for RF Leakage Containment
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Solution Overview
Problem
Conventional RF chokes in ovens are restricted by uniform width requirements, making them cumbersome and unsuitable for sleeker form factors, as they struggle to prevent RF leakage effectively at the interface between the oven cavity and door without compromising size constraints.
Innovation Solution
A multi-width choke assembly with a capacitive coupling element and an inductive tuning element, featuring tabs and projections of different widths, is designed to resonate and prevent RF leakage, offering a smaller profile than traditional quarter-wave resonant chokes while maintaining effective RF containment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform width quarter-wave resonant elements are used in the choke assembly, then RF leakage is effectively blocked, but the choke width becomes too large for sleeker oven form factors
Solution Approach 1:
The choke assembly employs elements with non-uniform widths, where different sections have different width dimensions. This allows specific regions to be optimized for RF blocking performance while other regions are minimized for compactness, resolving the contradiction between effective RF leakage prevention and reduced choke width for sleeker form factors
Solution Approach 2:
The patent changes the width parameter of the resonant elements from uniform to variable/non-uniform. By adjusting the width parameter across different sections of the choke assembly, the design achieves both effective RF blocking at critical interfaces and reduced overall width to accommodate modern sleeker oven designs
2Reliability
If the oven door interface is sealed to prevent RF leakage, then RF containment is improved, but the structural complexity of the door assembly increases
Solution Approach 1:
The choke assembly is integrated directly into the door structure, merging the RF sealing function with the door assembly. This combination eliminates the need for separate RF shielding components, reducing overall structural complexity while maintaining effective RF containment at the door interface
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 multi-width choke assembly effectively inhibits RF leakage, allowing for a more compact oven design without exceeding standard leakage limits, providing a narrower profile than conventional chokes while ensuring RF energy remains contained within the oven cavity.
Implementation Method 1
The choke assembly may include a capacitive coupling element and an inductive tuning element... These chokes are typically constructed based on providing a quarter-wave resonant circuit
Implementation Method 2
The inductive tuning element may include a plurality of projections bent relative to the capacitive coupling elements at a right angle
Implementation Method 3
The capacitive coupling element may include a plurality of tabs each having a first width
Data Source
AI summary
A choke assembly for provision onto an oven door to seal radio frequency (RF) energy within the oven when the door is closed may include a capacitive coupling element and an inductive tuning element. The capacitive coupling element may include a plurality of tabs each having a first width. The inductive tuning element may include a plurality of projections bent relative to the capacitive coupling elements at a right angle, the projections each having a second width that is smaller than the first width.