CN113766690B - Waveguide horn excitation metal fold surface wave uniform heating device - Google Patents
Waveguide horn excitation metal fold surface wave uniform heating device Download PDFInfo
- Publication number
- CN113766690B CN113766690B CN202110894850.0A CN202110894850A CN113766690B CN 113766690 B CN113766690 B CN 113766690B CN 202110894850 A CN202110894850 A CN 202110894850A CN 113766690 B CN113766690 B CN 113766690B
- Authority
- CN
- China
- Prior art keywords
- metal
- horn antenna
- metal sheets
- waveguide
- waveguide horn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/72—Radiators or antennas
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention provides a waveguide horn excitation metal corrugated surface wave uniform heating device which comprises a waveguide horn antenna and a metal corrugated structure arranged at the tail end of a horn mouth of the waveguide horn antenna, wherein an object stage is arranged above the metal corrugated structure. The device is through the open architecture that sets up the metal fold for the energy distribution in the furnace chamber is more even, and food can thermally equivalent, shortens the heat time, has improved heating efficiency.
Description
Technical Field
The invention relates to the technical field of microwave heating, in particular to a uniform heating device for a corrugated surface wave excited by a waveguide horn.
Background
With the rapid development of science and technology, the quality of life of people is further improved. Microwave ovens are now becoming an essential appliance in almost every household kitchen. The heating principle of the microwave oven is that electric energy is converted into high-frequency microwaves through a magnetron and the high-frequency microwaves are transmitted into a cavity of the microwave oven, and because food consists of molecules, a large number of charged particles exist among the food and the food has different polarities. In the microscopic field, the movement of molecules is extremely intense, so that the high frequency field causes the particles to oscillate back and forth in the food. The positively and negatively charged particles collide during extremely fast oscillations, generate heat by friction, and present a thermal reaction on a macroscopic scale, so that the food is heated finally. Since the 21 st century, the flat microwave oven has gradually replaced the turntable microwave oven due to its advantages of high space utilization, better heat transfer and convection, easy cleaning, etc. But the biggest disadvantage of the flat microwave oven is that the heating uniformity is poor.
The number of modes existing in the microwave oven cavity is generally calculated by using a mode analysis theory according to the size of the microwave oven cavity, and the more the mode number is distributed, the more uniform the field distribution is. Based on the theory, the method for improving the heating uniformity is to excite more electromagnetic field modes in the furnace chamber, so that the energy distribution in the chamber becomes uniform, and further uniform heating is realized.
At present, the problem of nonuniform field distribution in a microwave oven cavity is solved, and two technologies for realizing uniform heating are provided. The first technique is to change the cavity structure of the flat microwave oven, for example, to add metal protrusions and grooves on the inner wall of the cavity of the microwave oven. The second technique is to install electromagnetic stirrers in the microwave oven, increase the number of mode distributions in the microwave oven cavity, and supplement the weak place of the original microwave energy, so that the microwave energy is distributed more uniformly in the space in the microwave oven cavity.
The change of the inner structure of the cavity of the flat microwave oven is adjusted according to the standing wave distribution in the microwave oven, and the uniformity of the standing wave distribution can be improved. However, when different foods are heated in the microwave oven, the field distribution in the microwave oven can be changed, the reflection and refraction in the cavity of the microwave oven can be changed, the weakening effect of the metal bulges and the grooves additionally arranged on the inner wall of the cavity of the oven on the reflection and refraction is obviously reduced, and uniform electromagnetic field distribution cannot be obtained in the cavity. Meanwhile, structural modification in the cavity of the microwave oven can affect the space utilization rate of the microwave oven and increase the cost.
Rotation by an electromagnetic stirrer is another method to improve the heating uniformity of a microwave oven. However, the stirrer is poorly matched, rotation of the stirrer causes microwave reflection, and more microwave energy is reflected back to the magnetron in an idle condition, so that the temperature of the anode strip of the magnetron is increased, the service life of the magnetron is reduced, and the magnetron is even burnt out.
Disclosure of Invention
In view of the above problems, the present invention provides a uniform heating device for a corrugated surface wave excited by a waveguide horn, which can improve the heating uniformity of a microwave oven and the heating efficiency of the microwave oven.
The technical effects are realized by the following technical scheme:
the utility model provides a waveguide horn excitation metal fold surface wave uniform heating device, the device include waveguide horn antenna and set up the metal fold structure at waveguide horn antenna horn mouth end, the top of metal fold structure is equipped with the objective table.
Furthermore, the metal fold structure is a plurality of metal sheets vertical to the objective table.
Furthermore, the uniform heating device also comprises a metal grounding plate which is arranged at the tail end of the horn mouth of the waveguide horn antenna and extends along the bottom surface of the waveguide horn antenna.
Furthermore, the metal sheets are arranged on the upper surface of the metal grounding plate, the metal sheets are perpendicular to the extending direction of the horn mouth of the waveguide horn antenna, and the metal sheets are arranged in the extending direction of the horn mouth of the waveguide horn antenna in parallel.
Furthermore, the height of each metal sheet is equal, the height of each metal sheet is lower than the height of the tail end of the horn mouth of the waveguide horn antenna, and the metal sheets are arranged at equal intervals; the distance between the metal sheets is d1The height of the metal sheet is h1The thickness of the metal sheet is l1Then d is1+2×h1+l1λ/2, where λ is the wavelength of the electromagnetic wave propagating in the metal corrugated structure.
Furthermore, the sheetmetal divide into two sets ofly, and every group includes a plurality of sheetmetals, and one of them group sheetmetal setting is at the upper surface of metal ground plate, and another group sheetmetal setting is at the lower surface of objective table, and the sheetmetal is all perpendicular to waveguide horn antenna horn mouth's extending direction, and crisscross setting between upper and lower two sets of sheetmetals, and the extending direction at waveguide horn antenna horn mouth of the range that each sheetmetal is parallel to each other.
Furthermore, the height of each metal sheet is equal, the height of each metal sheet is lower than the height of the tail end of the horn mouth of the waveguide horn antenna, and the metal sheets are arranged at equal intervals; the distance between the metal sheets is d2The height of the metal sheet is h2Then d is2+4×h2λ, where λ is the wavelength of the electromagnetic wave propagating in the metal corrugated structure.
Further, the sheetmetal divide into four groups, and every group includes a plurality of sheetmetals, sets up a set of sheetmetal respectively on the both sides direction that metal ground plate upper surface lies in waveguide horn antenna horn mouth, sets up two sets of sheetmetals on the middle direction that metal ground plate upper surface lies in waveguide horn antenna horn mouth, and every group sheetmetal all is perpendicular to waveguide horn antenna horn mouth's extending direction, and the range that a plurality of sheetmetals of every group are parallel to each other is at waveguide horn antenna horn mouth's extending direction. Furthermore, the height of the two groups of metal sheets on the upper surface of the metal grounding plate in the directions of the two sides of the horn mouth of the waveguide horn antenna is lower than the height of the tail end of the horn mouth of the waveguide horn antenna, the height of the two groups of metal sheets on the upper surface of the metal grounding plate in the middle direction of the horn mouth of the waveguide horn antenna is slightly lower than the height of the tail end of the horn mouth of the waveguide horn antenna, and the thickness of the metal sheets is equal to that of the two groups of metal sheetsThe spacing between each group of metal sheets is equal, and the spacing between a plurality of metal sheets of each group is also equal; the height of two groups of metal sheets on the upper surface of the metal grounding plate in the middle direction of the horn mouth of the waveguide horn antenna is h3The height of two groups of metal sheets on the upper surface of the metal grounding plate in the directions of two sides of the horn mouth of the waveguide horn antenna is h4The distance between each group of metal sheets is d3The distance between the metal sheets of each group is d4Then d is a4+2×h3+l3＝λ/2，λ/4＜d4+2×h4+l4< lambda/2, where lambda is the wavelength of the electromagnetic wave propagating in the metal corrugated structure.
Furthermore, the device also comprises a metal guide plate which is arranged above the metal folds and can enhance the directionality of the feed source, the metal guide plate is positioned between the upper edge of the horn mouth of the waveguide horn antenna and the objective table and spliced with the objective table, and the arrangement direction of the metal guide plate and the objective table is the extension direction of the upper edge of the horn mouth of the waveguide horn antenna; the length of the metal guide plate along the extension direction of the horn mouth of the waveguide horn antenna is d5Then d is4+l3＜d5＜2×(d4+l3)。
The invention adopts a metal fold slow wave structure to slow down the propagation speed of microwave generated by a magnetron along the axial direction, so that the magnetron generates surface waves, and the food is heated by utilizing the uniformity of the surface waves. The metal corrugated surface wave uniform heating structure comprises a radiation source, a metal ground and metal corrugations with different sizes. The technical scheme of the specific implementation is that a proper feed source is selected, the position of the feed source is determined, and the basic size of the metal fold structure is determined according to the working frequency of the microwave oven, so that the microwave forms surface waves on the metal fold. According to the energy distribution in the microwave oven cavity, the position and the size of each fold structure are optimally designed, so that the energy distribution in the microwave oven cavity is relatively uniform. The metal fold structures are transversely arranged in the microwave oven cavity, so that uniform surface waves can be generated on the longitudinal section in the microwave oven cavity. And finally, placing a high-temperature-resistant medium on the metal corrugated structure to serve as an object stage so as to reduce multiple complex reflection and refraction of the electromagnetic waves in the microwave oven cavity. Meanwhile, the metal guide plate laid above the metal fold structure can enhance the directionality of the feed source and ensure that microwave energy can be completely fed into the cavity of the microwave oven.
Compared with the traditional microwave oven uniform heating technology, the waveguide horn-excited metal corrugated surface wave uniform heating device adopted by the invention has the following advantages:
(1) the invention adopts the waveguide horn for excitation, and can generate electromagnetic waves with high frequency, high power and various modes.
(2) The metal fold structure is simple, low in cost, capable of bearing high input power, low in reflection, low in loss of the microwave oven and high in space utilization rate of the microwave oven.
(3) The waveguide horn excited metal corrugated surface wave uniform heating device can reduce the propagation speed of microwaves along the axial direction, generate uniform surface waves, enable the energy distribution in the oven cavity to be more uniform, enable food to be uniformly heated, shorten the heating time and improve the heating efficiency of a microwave oven.
(4) The waveguide horn excited metal corrugated surface wave uniform heating device is suitable for various microwave heating devices.
Drawings
Fig. 1 is a schematic structural view of a corrugated metal surface wave uniform heating apparatus according to a first embodiment of the present invention.
Fig. 2 is a schematic side view of the corrugated surface wave uniform heating apparatus shown in fig. 1.
Fig. 3 is a side view of the corrugated surface wave uniform heating apparatus of fig. 1.
Fig. 4 is a schematic structural view of a staggered corrugated metal surface wave uniform heating device according to a second embodiment of the present invention.
Fig. 5 is a schematic side view of the staggered corrugated surface wave uniform heating apparatus shown in fig. 4.
Fig. 6 is a side view of the staggered corrugated surface wave uniform heating apparatus of fig. 4.
Fig. 7 is a schematic structural diagram of a surface wave uniform heating array device of a high-low metal corrugated array according to a third embodiment of the present invention.
Fig. 8 is a schematic side view of the surface wave uniform heating array device of the high-low metal corrugated array shown in fig. 7.
Fig. 9 is a schematic front dimension view of the surface wave uniform heating array device of the high-low metal corrugated array shown in fig. 7.
Fig. 10 is a side view of the surface wave uniform heating array device of the high and low metal corrugated array shown in fig. 7.
Fig. 11 is a return loss diagram of the surface wave uniform heating array device of the high-low metal corrugated array shown in fig. 7.
Fig. 12 is a field intensity distribution diagram of the XOZ surface of the surface wave uniform heating array device of the high-low metal corrugated array shown in fig. 7.
Fig. 13 is a YOZ plane field intensity distribution diagram of the surface wave uniform heating array device of the high-low metal corrugated array shown in fig. 7.
In the figure: 1-waveguide horn antenna, 2-metal grounding plate, 3-lower metal fold, 4-upper metal fold, 5-high metal fold, 6-low metal fold, 7-objective table and 8-metal guide plate.
Detailed Description
The invention is further described below with reference to specific examples.
As shown in fig. 1-3, the waveguide horn-excited metal corrugated surface wave uniform heating device of the present invention includes a waveguide horn antenna 1 and a metal corrugated structure, wherein the metal corrugated structure is disposed at the end of the horn mouth of the waveguide horn antenna 1, and a stage 7 is disposed above the metal corrugated structure.
The metal fold structure of the invention is a slow wave structure. The slow-wave structure is a structure for transmitting surface waves, and the open structure can be used for guiding electromagnetic wave propagation, so that the propagation speed of the electromagnetic wave is smaller than the wave speed of a free space, and the electromagnetic wave can regularly propagate along the axial direction of the structure, namely the surface waves. In the invention, the open structure adopts a metal fold structure, and high-power electromagnetic waves are generated by the waveguide horn antenna. The material of the objective table is heat-resistant material such as ceramic.
The metal fold structure is a plurality of metal sheets, and the metal sheets are perpendicular to the objective table. The metal sheet is made of copper, aluminum and other metals with good conductivity.
The uniform heating device also comprises a metal grounding plate 2 which is arranged at the tail end of the horn mouth of the waveguide horn antenna and extends along the bottom surface of the waveguide horn antenna.
Referring to fig. 1 to 3, the metal sheets are disposed on the upper surface of the metal ground plate 2, the metal sheets are perpendicular to the extending direction of the horn mouth of the waveguide horn antenna 1, and the metal sheets are arranged in parallel to each other in the extending direction of the horn mouth of the waveguide horn antenna 1.
The surface of the metal fold structure is an inductive surface and can transmit TM waves. The electromagnetic wave forms standing waves up and down in the metal fold structure, so that each metal fold plays a role of a parallel double-conductor stub. Assuming the material is lossless, the metal corrugated structure behaves as a pure reactance to the incoming wave:
in the formula ZdIs the intrinsic impedance, epsilon, of the metal medium in the metal corrugated structurerIs the relative dielectric constant of the medium, λ0For wavelengths in free space, h is the height of the metal corrugations, assuming each element in the corrugated metal structure is infinitely thin, the spacing between elements is negligible.
The metal fold structure stores energy from passing electromagnetic waves when d < lambda0At/4, the surface along the top position of the metal fold presents an inductive surface; when d ═ λ0-4, z ∞, with open circuit along the surface of the metal pleat at the top position; when d ═ λ0And/2, z is 0, and the surface is in short circuit.
In the waveguide horn excited corrugated surface wave uniform heating device shown in fig. 1-3, the waveguide horn antenna is used for generating electromagnetic waves with stronger power, in the corrugated metal structure, the metal sheets have the same height, the height of the metal sheets is slightly lower than the height of the tail end of the horn mouth of the waveguide horn antenna, and the metal sheets are arranged at equal intervals, that is, the metal sheets are periodic junctions with equal interval and equal heightThe distance between the metal sheets is d1The height of the metal sheet is h1The thickness of the metal sheet is l1The periodic structure parameter satisfies the following relation: d1+2×h1+l1λ/2, where λ is the wavelength of the electromagnetic wave propagating in the metal corrugated structure.
In addition, the distance d between the metal sheets with the metal fold structure according to the actual propagation condition of the electromagnetic wave1Height h1Thickness l1The adjustment can be made without using a periodic structure, for example the height of the last cell can be increased to increase the heating effect of the surface wave.
Fig. 4-6 illustrate a second embodiment of the present invention. In the metal fold structure, the metal sheets are divided into two groups, each group comprises a plurality of metal sheets, and one group of metal sheets is arranged on the upper surface of the metal grounding plate, namely a lower metal fold 3; the other group of metal sheets are arranged on the lower surface of the object stage, namely the upper metal fold 4; the metal sheets are all perpendicular to the extending direction of the horn mouth of the waveguide horn antenna 1, the lower metal folds 3 and the upper metal folds 4 are arranged in a staggered mode, and the metal sheets are arranged in the extending direction of the horn mouth of the waveguide horn antenna 1 in parallel. At this time, the waveguide horn-excited metal corrugated surface wave uniform heating device is a staggered metal corrugated surface wave uniform heating device. The metal sheets have equal height, the height of the metal sheets is lower than that of the tail end of the horn mouth of the waveguide horn antenna, the metal sheets are arranged at equal intervals, namely, the metal fold structure is composed of upper and lower metal fold periodic structures with equal interval and equal height, and the interval between the metal sheets is d2The height of the metal sheet is h2The thickness of the metal sheet is as thin as possible, then d2+4×h2λ, where λ is the wavelength of the electromagnetic wave propagating in the metal corrugated structure.
Compared with the first embodiment shown in fig. 1 to 3, the upper and lower metal corrugated structures of the second embodiment have better guiding effect on the electromagnetic wave, and are easier to slow down the transverse propagation speed of the electromagnetic wave, so as to generate a more uniform surface wave. Connected to the upper metal pleat structure is a stage, which is a heat-resistant medium; connected to the lower metal corrugated structure is a metal ground plate.
Fig. 7-10 show a third embodiment of the present invention, which is to reduce the overall size of the waveguide horn structure while maintaining the performance of the horn antenna. In the metal fold structure, the metal sheets are divided into 4 groups, each group comprises a plurality of metal sheets, and a group of metal sheets, namely a low metal fold 6, is respectively arranged on the upper surface of the metal grounding plate 2 in the directions of two sides of the horn mouth of the waveguide horn antenna 1; two groups of metal sheets, namely high metal folds 5 are arranged on the upper surface of the metal grounding plate 2 in the middle direction of the horn mouth of the waveguide horn antenna; each group of metal sheets is perpendicular to the extending direction of the horn mouth of the waveguide horn antenna 1, and the plurality of metal sheets of each group are arranged in parallel in the extending direction of the horn mouth of the waveguide horn antenna 1. The thickness of the metal sheet should be as thin as possible. In this embodiment, the uniform heating device of the present invention is a high-low metal corrugated array surface wave uniform heating array device. The two groups of metal fold structures (high metal folds 5) in the middle have higher height which is slightly lower than the height of the tail end of the horn mouth of the waveguide horn antenna, and the height is set as h3Thickness of l3(ii) a The two groups of metal fold structures (low metal folds 6) on the outer side are lower in height and far lower than the height of the tail end of the horn mouth of the waveguide horn antenna, leakage of electromagnetic waves in the transverse transmission process is reduced, and the height is set to be h4Thickness of l4(ii) a Setting the distance between each group of metal sheets as d3The distance between the metal sheets of each group is d4Then d is4+2×h3+l3＝λ/2，λ/4＜d4+2×h4+l4< lambda/2, where lambda is the wavelength of the electromagnetic wave propagating in the metal corrugated structure.
In this embodiment, the uniform heating device further includes a metal guide plate 8 disposed above the metal fold and capable of enhancing directionality of the feed source, the metal guide plate 8 is located between the upper edge of the horn mouth of the waveguide horn antenna and the stage 7 and is spliced with the stage 7, and the arrangement direction of the metal guide plate 8 and the stage 7 is the extending direction of the upper edge of the horn mouth of the waveguide horn antenna. The metal guide plate is made of metal with strong conductivity, and the thickness of the metal guide plate is consistent with that of the object stage, so that the microwave energy can be completely fed into the microwave oven cavityAnd the utilization rate of microwave energy is enhanced. The length of the metal guide plate 8 along the extension direction of the horn mouth of the waveguide horn antenna is d5Then d is4+l3＜d5＜2×(d4+l3)。
It should be noted that the structure of the metal guide plate may be added to the uniform heating apparatus of the first and second embodiments to enhance the microwave energy utilization efficiency.
Fig. 11-13 are graphs showing simulation results of a third embodiment of the present invention, which has a return loss of about-10 dB around the center frequency in the unloaded condition, and a return loss of less than-7.5 dB in the operating frequency range of the microwave oven. The return loss of the heated food placed in the cavity of the microwave oven is reduced accordingly.
As shown in fig. 12-13, the homogeneous heating device of fig. 7 was simulated under no load conditions to obtain the surface wave longitudinal and transverse electric field distributions and the field intensity distribution on the stage at different frequencies. According to the distribution of the longitudinal and transverse electric fields of the surface wave, the electromagnetic wave field intensity of the XOZ surface and the YOZ surface is relatively uniform, the maximum field intensity in the cavity of the microwave oven is 100V/m under the condition that the direct current power is 1W, and the stronger uniform surface wave can be generated in the cavity of the microwave oven. The device of the invention can realize uniform heating.
The third embodiment may not secure the periodic structure in order to secure a uniform and strong surface wave throughout the inside of the microwave cavity, similar to the first embodiment, but needs to satisfy the above-mentioned relationship. Compared with the first and second embodiments, the structure of the third embodiment can generate uniform surface waves in the direction of transverse propagation of electromagnetic waves, so as to ensure uniformity of electromagnetic energy in a transverse section, and can also generate uniform surface waves in a plane parallel to the aperture of the horn antenna, so as to ensure uniformity of electromagnetic energy in a longitudinal section, so that the electromagnetic energy covers every corner in the cavity of the microwave oven, and the heating uniformity of the microwave oven is improved.
The waveguide horn excited metal corrugated surface wave uniform heating device can also be applied to other open or closed microwave heating equipment and other equipment needing high-power uniform heating in the industry.
Claims (4)
1. The uniform heating device for the metal corrugated surface wave excited by the waveguide horn is characterized by comprising a waveguide horn antenna and a metal corrugated structure arranged at the tail end of a horn mouth of the waveguide horn antenna, wherein an object stage is arranged above the metal corrugated structure; the metal fold structure is a plurality of metal sheets vertical to the objective table; the uniform heating device also comprises a metal grounding plate which is arranged at the tail end of the horn mouth of the waveguide horn antenna and extends along the bottom surface of the waveguide horn antenna;
the metal sheets are divided into four groups, each group comprises a plurality of metal sheets, a group of metal sheets is respectively arranged on the upper surface of the metal grounding plate in the directions of two sides of the horn mouth of the waveguide horn antenna, two groups of metal sheets are arranged on the upper surface of the metal grounding plate in the direction of the middle of the horn mouth of the waveguide horn antenna, each group of metal sheets is perpendicular to the extending direction of the horn mouth of the waveguide horn antenna, and the plurality of metal sheets of each group are arranged in the extending direction of the horn mouth of the waveguide horn antenna in parallel;
the height of the two groups of metal sheets on the upper surface of the metal grounding plate in the direction of the two sides of the horn mouth of the waveguide horn antenna is lower than the height of the tail end of the horn mouth of the waveguide horn antenna, the height of the two groups of metal sheets on the upper surface of the metal grounding plate in the direction of the middle of the horn mouth of the waveguide horn antenna is slightly lower than the height of the tail end of the horn mouth of the waveguide horn antenna, the thicknesses of the metal sheets are equal, the intervals between the metal sheets of each group are equal, and the intervals between the metal sheets of each group are also equal; the height of two groups of metal sheets on the upper surface of the metal grounding plate in the middle direction of the horn mouth of the waveguide horn antenna is h3Thickness of l3The height of two groups of metal sheets on the upper surface of the metal grounding plate in the directions of two sides of the horn mouth of the waveguide horn antenna is h4Thickness of l4The distance between each group of metal sheets is d3The distance between the metal sheets of each group is d4Then d is4+2×h3+l3＝λ/2，λ/4＜d4+2×h4+l4< lambda/2, where lambda is the wavelength of the electromagnetic wave propagating in the metal corrugated structure.
2. The uniform heating device according to claim 1, wherein the metal sheets are disposed on the upper surface of the metal ground plate, the metal sheets are perpendicular to the extending direction of the horn mouth of the waveguide horn antenna, and the metal sheets are arranged in parallel with each other in the extending direction of the horn mouth of the waveguide horn antenna.
3. The uniform heating device according to claim 2, wherein the metal sheets have equal height, the height of the metal sheets is lower than that of the tail end of the horn mouth of the waveguide horn antenna, and the metal sheets are arranged at equal intervals; the distance between the metal sheets is d1The height of the metal sheet is h1The thickness of the metal sheet is l1Then d is1+2×h1+l1λ/2, where λ is the wavelength of the electromagnetic wave propagating in the metal corrugated structure.
4. The uniform heating device according to claim 1, further comprising a metal guide plate which is arranged above the metal folds and can enhance the directionality of the feed source, wherein the metal guide plate is arranged between the upper edge of the horn antenna bell mouth of the waveguide horn antenna and the objective table and is spliced with the objective table, and the arrangement direction of the metal guide plate and the objective table is the extension direction of the upper edge of the horn antenna bell mouth of the waveguide horn antenna; the length of the metal guide plate along the extension direction of the horn mouth of the waveguide horn antenna is d5Then d is4+l3＜d5＜2×(d4+l3)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110894850.0A CN113766690B (en) | 2021-08-05 | 2021-08-05 | Waveguide horn excitation metal fold surface wave uniform heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110894850.0A CN113766690B (en) | 2021-08-05 | 2021-08-05 | Waveguide horn excitation metal fold surface wave uniform heating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113766690A CN113766690A (en) | 2021-12-07 |
| CN113766690B true CN113766690B (en) | 2022-06-14 |
Family
ID=78788559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110894850.0A Active CN113766690B (en) | 2021-08-05 | 2021-08-05 | Waveguide horn excitation metal fold surface wave uniform heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113766690B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114665242B (en) * | 2022-04-06 | 2023-03-24 | 湖南大学 | Device and method for improving electromagnetic field uniformity in microwave cavity by using adjustable artificial magnetic conductor |
| CN114709586B (en) * | 2022-04-07 | 2023-04-25 | 湖南大学 | Microwave resonant cavity implementation method capable of continuously translating electromagnetic field in microwave cavity |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4460814A (en) * | 1982-09-27 | 1984-07-17 | Amana Refrigeration, Inc. | Oven antenna probe for distributing energy in microwave |
| CN2834091Y (en) * | 2005-09-02 | 2006-11-01 | 美的集团有限公司 | Waveguide tube for microwave heater |
| CN2834092Y (en) * | 2005-09-02 | 2006-11-01 | 美的集团有限公司 | Waveguide tube for microwave heater |
| CN102377005B (en) * | 2011-07-15 | 2013-07-17 | 电子科技大学 | Reactance-regulated plane integrated waveguide circulator with T-shaped port |
| CN102496759B (en) * | 2011-11-29 | 2014-03-12 | 华为技术有限公司 | Planar waveguide, waveguide filter and antenna |
| CN103367894B (en) * | 2013-07-04 | 2015-04-08 | 西安电子科技大学 | Holographic antenna used for directed radiation on surface of flight body |
| KR101707233B1 (en) * | 2015-03-31 | 2017-02-28 | 공성호 | Multi-band microwave cavity antenna and heating apparatus using the same |
| CN105509108B (en) * | 2015-12-21 | 2018-01-12 | 电子科技大学 | A kind of micro-wave oven for using cylindrical chamber and making radiator with helical antenna |
| CN107534028A (en) * | 2016-04-12 | 2018-01-02 | Ｓｃｉｖａｘ株式会社 | Thermoelectricity magnetic wave transformational structure, thermoelectricity magnetic wave translation building block, wavelength selectivity heat dissipation equipment, wavelength selectivity firing equipment, wavelength selectivity heat dissipating method, the manufacture method of wavelength selectivity heating means and thermoelectricity magnetic wave transformational structure |
| EP3661326B1 (en) * | 2016-06-30 | 2022-04-20 | Panasonic Intellectual Property Management Co., Ltd. | High-frequency heating device |
| KR101707921B1 (en) * | 2016-06-30 | 2017-02-17 | 한국기초과학지원연구원 | Microwave heating and dryer using a rectangular waveguide traveling wave antenna |
| CN111066375B (en) * | 2018-04-06 | 2022-03-04 | 松下知识产权经营株式会社 | High-frequency heating device |
| CN109888466B (en) * | 2019-02-20 | 2020-11-03 | 北京航空航天大学 | Novel feed ultra-low profile surface wave antenna |
| CN111129724B (en) * | 2019-12-03 | 2021-09-28 | 西安电子科技大学 | H-plane horn antenna, radar and communication system with miniaturized loading slow-wave structure |
-
2021
- 2021-08-05 CN CN202110894850.0A patent/CN113766690B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113766690A (en) | 2021-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113766690B (en) | Waveguide horn excitation metal fold surface wave uniform heating device | |
| JP3031898B2 (en) | microwave | |
| KR20030031112A (en) | Improved dielectric heating using inductive coupling | |
| CN217591139U (en) | Waveguide slot array heater | |
| CN114007294B (en) | Excitation device for uniform field distribution of radiation type surface wave | |
| US3471672A (en) | Slotted waveguide applicator | |
| CN115734413A (en) | High-energy-efficiency stepped metal corrugated microwave uniform heating device | |
| US4259561A (en) | Microwave applicator | |
| CN113597038B (en) | Microwave surface wave uniform heating device for microwave oven | |
| JPH0922775A (en) | High-frequency heating device | |
| CN114245505B (en) | Microwave film heating device | |
| MXPA02005638A (en) | A cylindrical reactor with an extended focal region. | |
| CN1258380A (en) | Electrodeless discharge energy supply apparatus and electrodeless dicharge lamp device | |
| JPWO2018037696A1 (en) | High frequency heating device | |
| CN114040533B (en) | Surface wave uniform heating device for horn excitation medium | |
| CN112820608B (en) | Low-frequency-band slow-wave structure based on metamaterial | |
| CN112616213B (en) | High-efficiency waveguide slot antenna array for drying base cloth | |
| EP3133348B1 (en) | Heating cell, heater using same, heating system and use thereof | |
| JPH10253066A (en) | Microwave oven equipped with induction structure of electromagnetic waves | |
| CN113851822B (en) | High-power frequency division space selective antenna | |
| CN109698107A (en) | Surface wave plasma equipment | |
| CN118234074A (en) | System and method for improving uniform distribution of microwave energy by microwave array | |
| CN211720772U (en) | Microwave excitation cavity device | |
| CN114173442A (en) | Waveguide slot array heater designed by Taylor function synthesis method | |
| Bhargava et al. | Effect of Different Positions of Waveguide Port on the Coupled Model of Electromagnetic Wave and Heat Transfer in Microwave Heating of Coal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |