Multi-Band Radio Wave Radiator Layout for Compact Oven Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional microwave ovens have limited radiation efficiency across multiple frequency bands, which hinders optimal heating of various cooking ingredients, leading to inefficient cooking and longer cooking times.
Innovation Solution
A radio wave radiating device with multiple radiating portions, including a curved middle portion and separate radiating elements connected to a waveguide and ground, allowing for optimal radiation efficiency across multiple frequency bands and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single radiating portion is used in the electromagnetic wave radiating device, then the device structure is simple, but the radiation efficiency is limited to a single frequency band only
Solution Approach 1:
The electromagnetic wave radiating device is divided into multiple radiating portions (first radiating portion and second radiating portion), each optimized for different frequency bands. The first radiating portion has a length optimized for 2.45GHz while the second radiating portion has a length optimized for 5.8GHz, allowing simultaneous operation across multiple frequency bands with high radiation efficiency in each band.
2Productivity
If the radiating device is designed for optimal radiation efficiency at multiple frequency bands, then heating performance improves, but the device size increases
Solution Approach 1:
Multiple radiating portions for different frequency bands are merged into a single integrated electromagnetic wave radiating device. The first and second radiating portions share common structural elements including the waveguide connection and ground reference, allowing multi-band operation without proportionally increasing the overall device volume.
3Volume of moving object
If the distance between waveguide connector and ground is reduced for miniaturization, then device size decreases, but radiation efficiency at multiple frequency bands is compromised
Solution Approach 1:
The device employs local quality optimization by providing different radiating portion lengths (first radiating portion: 6cm for 2.45GHz, second radiating portion: 2.6cm for 5.8GHz) while maintaining a compact overall structure. Each radiating portion is locally optimized for its target frequency band, achieving high radiation efficiency without requiring a large distance between the waveguide connector and ground.
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 solution enables uniform heating and defrosting of cooking ingredients with improved efficiency and reduced cooking time, while allowing for a more compact device design.
Implementation Method 1
a radiating element electrically connected to another end of the radio wave supply unit and another end of the earth part, respectively, and configured to radiate radio wave received from the radio wave supply unit
Implementation Method 2
another part of the electromagnetic wave radiating device is disposed on the inner wall of the inner space of the oven for miniaturization and is connected to a ground that is electrically connected to an earth. Due to a ground effect, an electromagnetic wave in a lower band compared to a length of an actual electromagnetic wave radiating device may be radiated through the electromagnetic wave radiating device
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
Embodiments of the present disclosure disclose a radio wave radiating device including multiple radiating portions and an antenna having bending patterns. As the multiple radiating portions are provided, optimal radiation efficiency can be provided at plural frequency bands. Further, due to the bending patterns, a total length of a portion disposed between an earth terminal and a transmission connector in the antenna is longer than a distance between the earth terminal and the transmission connector