Microwave Heating Device With Phase-Controlled Orthogonal Radiation Portions
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Solution Overview
Problem
Conventional microwave heating devices lack the ability to efficiently radiate both linearly and circularly polarized waves simultaneously and effectively distribute microwave power within the heating chamber, leading to non-uniform heating.
Innovation Solution
The microwave heating device employs a configuration with multiple radiation portions, where the phase difference between microwaves from each portion can be controlled to synthesize power and change the direction of circularly polarized waves, allowing for the distribution of microwaves to form both linearly and circularly polarized waves, and adapt to the shape and size of the heating chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple radiation portions are provided with dedicated microwave generating means, then heating uniformity is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple microwave generating means into a single shared system that serves multiple radiation portions. The microwave generating means includes a dividing portion that splits microwave signals and multiple amplification portions that distribute power to different radiation portions, eliminating the need for separate dedicated generating means for each radiation portion while maintaining heating uniformity.
Solution Approach 2:
The patent segments the microwave generating system into functional modules: an oscillation portion that generates microwaves, a dividing portion that splits the signal into multiple paths, and multiple amplification portions that independently control power levels for different radiation portions. This modular segmentation allows flexible power distribution while reducing overall system complexity.
2Reliability
If microwave generating means are operated in time-division manner, then interference is reduced, but productivity decreases
Solution Approach 1:
The patent implements dynamic control of microwave power distribution through phase shifters that can adjust the phase of microwave signals in real-time. This allows the system to operate multiple microwave generating means simultaneously while dynamically controlling their output phases to prevent interference, eliminating the need for time-division operation and thereby maintaining high productivity.
Solution Approach 2:
The patent changes the phase parameter of microwave signals using phase shifters to control interference patterns. By adjusting phase differences between signals from different radiation portions, the system can operate all microwave generating means simultaneously without interference, maximizing productivity while ensuring reliable operation.
3Manufacturing precision
If phase shifter is used to control power distribution, then heating control precision is improved, but device complexity increases
Solution Approach 1:
The patent designs the phase shifter to serve multiple functions: it controls the phase of microwave signals for interference suppression, regulates power distribution to different radiation portions, and enables both linear and circular polarization modes. This multi-functionality reduces the need for separate control mechanisms, thereby improving heating control precision without proportionally increasing device complexity.
4Stability of the object's composition
If circularly polarized waves are radiated, then heating uniformity is improved, but device complexity increases
Solution Approach 1:
The patent combines linearly polarized wave radiation from multiple radiation portions with phase control to generate circularly polarized waves. By radiating linearly polarized waves from two orthogonal radiation portions with a 90-degree phase difference, the system achieves circular polarization without requiring separate circular polarization generating structures, thereby maintaining heating uniformity while limiting the increase in device complexity.
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 uniform and efficient heating by dispersing microwaves effectively throughout the chamber, accommodating various object types and sizes, and allowing for desired heating states by controlling the phase differences and radiation patterns.
Implementation Method 1
a first microwave feeding point and a second microwave feeding point which are orthogonal to each other in each of the plural radiation portions, wherein the plural radiation portions radiate, to an inside of a heating chamber, microwaves supplied to respective microwave feeding points
Implementation Method 2
the heating chamber having a substantially-rectangular parallelepiped shape for housing an object to be heated and for heating the housed object with microwaves from the plural radiation portions
Implementation Method 3
the first radiation portion and the second radiation portion are supplied with microwaves from a single microwave generating means, wherein the first radiation portion and the second radiation portion synthesize electric power of radiated microwaves
Implementation Method 4
the phase shifter is structured to change over the microwave path line length by utilizing ON/OFF characteristics of diodes
Data Source
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AI summary
In order to provide a microwave heating device which includes radiation portions having a function of radiating microwaves forming both linearly polarized waves and circularly polarized waves and, further, having an electric-power synthesizing function, thereby offering new radiation functions. A heating chamber (100) for housing a to-be-heated object therein is provided with plural radiation portions (20, 21) on a bottom wall surface (103) thereof, and each of the radiation portions (20, 21) is provided with plural microwave feeding points (20a, 20b, 21a, 21b), such that phase control and driving control are performed for each microwave feeding point.