Waveguide Reflector Element for Uniform Microwave Distribution
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Solution Overview
Problem
Existing microwave ovens require rotating elements to achieve uniform heating, which can be cumbersome and inefficient, and often face impedance matching issues that lead to critical operations when there are mismatched or no loads.
Innovation Solution
Incorporating a reflector element with slanted, rotation-symmetrically arranged reflection surfaces within the waveguide to distribute microwaves uniformly within the oven cavity, eliminating the need for rotating parts and enhancing impedance matching between the microwave generator and oven cavity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotating elements (turntable or mode stirrers) are used to achieve uniform microwave distribution, then heating uniformity is improved, but device complexity and mechanical reliability deteriorate due to moving parts
Solution Approach 1:
The patent replaces mechanical rotating elements (turntable or mode stirrers) with a stationary reflector element that has a specific geometric shape. This reflector element redistributes microwaves through its fixed structure, achieving uniform heating without any moving parts. The geometric configuration of the reflector element creates multiple reflection paths that distribute microwave energy evenly throughout the oven cavity, eliminating the need for mechanical rotation while maintaining heating uniformity.
2Power
If the waveguide interface is properly dimensioned for impedance matching, then power transfer is improved, but adaptability to different load conditions deteriorates
Solution Approach 1:
The patent introduces a reflector element with variable geometric parameters (shape, size, position) within the waveguide that can be optimized to achieve both good impedance matching and adaptability to different load conditions. The reflector element modifies the electromagnetic field distribution and impedance characteristics dynamically through its geometric design, allowing the system to maintain power transfer efficiency while adapting to various load scenarios without requiring active adjustment mechanisms.
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
This solution achieves uniform microwave distribution and impedance matching without rotating elements, ensuring consistent heating and preventing critical operations due to load mismatches, thereby improving the efficiency and reliability of microwave ovens.
Implementation Method 1
a reflector element comprising a plurality of reflection surfaces, the reflector element being fixedly arranged within the waveguide or integrated in the waveguide wall in order to reflect the microwaves into the oven cavity in a distributed manner
Data Source
AI summary
The invention relates to a microwave oven comprising an oven cavity (2), a microwave generator (3) for generating microwaves and a waveguide (4) for guiding the microwaves to the oven cavity (2), wherein the waveguide (4) includes a reflector element (5) comprising a plurality of reflection surfaces (5.2), the reflector element (5) being fixedly arranged within the waveguide (4) or integrated in the waveguide wall in order to reflect the microwaves into the oven cavity (2) in a distributed manner.