Microwave Resonator Heating for Compact Aerosol Generation
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Solution Overview
Problem
Existing microwave heating technologies face challenges in miniaturization and energy efficiency, particularly when applied to small-scale heating devices, such as those required for generating aerosols in heating-type cigarettes.
Innovation Solution
The development of a compact microwave heating device using a solid-state microwave generator, a miniaturized microwave transmission line, and a resonator formed by a cavity between an outer and central conductor, which generates an amplified electromagnetic field to heat an aerosol-generating substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If microwave heating technology is applied to small-scale heating devices, then heating rate increases, but device size cannot be miniaturized due to microwave wavelength constraints
Solution Approach 1:
The patent embeds the aerosol-generating substrate inside the resonator cavity, nesting the heating target within the microwave resonant structure. This allows the substrate to be positioned at the electromagnetic field maximum point, maximizing heating efficiency while keeping the overall device compact and overcoming the wavelength-size constraint
Solution Approach 2:
The patent creates a localized high-energy electromagnetic field region within the resonator by designing specific cavity dimensions that resonate at the microwave frequency. This concentrates the heating effect precisely where needed (at the substrate position) rather than requiring uniform heating throughout a large volume, enabling miniaturization
2Use of energy by moving object
If microwave heating is used for aerosol generation, then energy efficiency improves, but precise control of heating temperature becomes difficult
Solution Approach 1:
The patent incorporates a temperature sensor that detects the temperature of the aerosol-generating substrate and feeds this information back to the control unit. The control unit adjusts the microwave output power based on the detected temperature, creating a closed-loop control system that maintains precise temperature control while preserving microwave heating efficiency
Solution Approach 2:
The patent uses pulsed microwave heating rather than continuous heating, controlling the microwave generator to operate in periodic cycles. This allows the substrate to be heated in controlled increments, preventing overheating and enabling precise temperature management while maintaining energy efficiency
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 enables efficient aerosol generation with increased heating rates and improved energy efficiency, while also allowing for the miniaturization of microwave heating devices, overcoming the limitations of traditional external heating schemes.
Implementation Method 1
generating a microwave of a preset frequency using a generator
Implementation Method 2
generating an amplified electromagnetic field by resonating the microwave using the resonator
Implementation Method 3
Microwave heating technology is used to directly heat polar molecules such as water or organic solvents based on the principle of dielectric heating
Data Source
AI summary
According to an example, to generate an aerosol, microwaves of a preset frequency are generated by using an oscillator the generated microwaves supplied to a resonator formed by a cavity between an outer conductor and a central conductor via a microwave coupler, the microwaves are resonated through the resonator to generated an amplified electromagnetic field, and an aerosol-generating substrate inserted such that the electromagnetic field is adjacent to the central conductor is heated to generate an aerosol.