Patch Antenna Microwave Heating Zones
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional microwave ovens often result in non-uniform heating of food due to the use of a single, non-coherent microwave source, leading to inefficiencies and the need for complex control strategies to achieve even heating.
Innovation Solution
A microwave heating apparatus featuring at least two patch antennas coupled to microwave generators and a control unit, which selects energy levels for each antenna to create direct heating zones within the cavity, allowing for more precise and uniform heating by directing microwave energy directly to the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single magnetron is used to generate microwaves, then the device complexity is reduced, but the heating uniformity deteriorates
Solution Approach 1:
The patent divides the single magnetron source into multiple patch antenna elements (at least two) that are spatially distributed within the cavity. Each antenna independently radiates microwaves into its own predefined direct heating zone, creating segmented heating regions that collectively provide uniform overall heating without requiring complex control mechanisms.
Solution Approach 2:
Each patch antenna is configured to create a specific direct heating zone with optimized energy distribution tailored to the local heating requirements. The control unit selects energy levels for each antenna based on its specific position and coverage area, allowing localized optimization of heating uniformity while maintaining overall system simplicity.
2Manufacturing precision
If field-shaping with multiple coherent sources is used, then the heating uniformity is improved, but the device complexity and control difficulty increase
Solution Approach 1:
Instead of using one complex field-shaping system, the patent segments the heating function into multiple independent patch antennas, each creating its own direct heating zone. This segmentation eliminates the need for complex interference-based field shaping while achieving uniform heating through spatial distribution of simpler elements.
Solution Approach 2:
The patent replaces the mechanical and control complexity of field-shaping systems with a simpler geometric arrangement of patch antennas. By using predefined direct heating zones based on antenna positions rather than dynamic field interference control, the system achieves heating uniformity through spatial configuration rather than complex control strategies.
3Manufacturing precision
If field-shaping with multiple coherent sources is used, then the heating uniformity is improved, but the control strategy complexity increases
Solution Approach 1:
The patent establishes predefined direct heating zones for each patch antenna before operation begins. The control unit has access to pre-stored energy level selections for each antenna configuration, eliminating the need for real-time complex control calculations. This preliminary setup simplifies the control strategy while maintaining heating uniformity.
Solution Approach 2:
The control unit simplifies control by adjusting discrete energy level parameters for each patch antenna based on pre-determined configurations. Rather than implementing complex field-shaping control algorithms, the system achieves uniform heating by selecting from predefined energy level combinations for each antenna, reducing control strategy complexity.
4Manufacturing precision
If mechanical stirrers and turntables are used, then the heating uniformity is improved, but the device complexity and energy consumption increase
Solution Approach 1:
The patent replaces mechanical stirring and rotating mechanisms with a static array of patch antennas that create overlapping direct heating zones. This substitution eliminates mechanical components entirely, reducing energy consumption associated with motors and moving parts while achieving heating uniformity through electromagnetic field distribution from multiple fixed sources.
5Manufacturing precision
If mechanical stirrers and turntables are used, then the heating uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent extracts and removes the mechanical stirring and turning mechanisms from the microwave heating system. Instead, it uses multiple patch antennas with predefined direct heating zones to achieve uniform heating, eliminating the need for mechanical components and their associated complexity while maintaining heating effectiveness.
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 configuration enables approximately 85% more energy transfer to the load in the direct heating zones, providing more efficient and uniform heating compared to traditional magnetron-based systems, with benefits including a lightweight, low-cost design and integration with solid-state technology.
Implementation Method 1
Each of the at least two patch antennas is configured to radiate microwaves into a predefined direct heating zone within the cavity
Implementation Method 2
A conventional microwave oven cooks food by a process of dielectric heating in which a high-frequency alternating electromagnetic field is distributed throughout an enclosed cavity
Data Source
AI summary
The microwave heating apparatus (100) includes a cavity (101) arranged to receive a load (102A, 102B), at least two patch antennas (103A, 103B) coupled to the at least one microwave generator (104), and a control unit (105). Each of the at least two patch antennas (103A, 103B) is configured to radiate microwaves into a predefined direct heating zone (108A, 108B) within the cavity proximate the respective patch antenna (103A, 103B). The control unit (105) is configured to select energy levels for each of the at least two patch antennas (103A, 103B) as if the load (102A, 102B) were static and as if there not interference between the at least two patch antennas (103A, 103B).