JP6111421B2 - Microwave heating device - Google Patents

Description

  The present invention relates to a microwave heating apparatus such as a microwave oven, and more particularly to a microwave heating apparatus characterized by the structure of a microwave radiation portion.

  A typical microwave heating apparatus that heats an object to be heated with a microwave is a microwave oven. In the microwave oven, the microwave generated in the microwave supply means is radiated into the metal heating chamber, and the object to be heated in the heating chamber is heated by the radiated microwave.

  A magnetron is used as a microwave supply means in a conventional microwave oven. Microwaves generated by the magnetron are radiated into the heating chamber through the waveguide. If the electromagnetic field distribution of the microwave in the heating chamber is not uniform, the object to be heated cannot be heated by microwaves uniformly.

  As a means for uniformly heating the object to be heated, a structure for rotating the object to be heated by rotating a table on which the object to be heated is rotated, a structure for rotating an antenna for radiating microwaves while fixing the object to be heated, or A microwave heating apparatus having a structure in which the phase of the microwave generated from the microwave supply means is changed by a phase shifter has been common.

  For example, in a conventional microwave heating apparatus, a rotating antenna, an antenna shaft, and the like are arranged inside a waveguide. By driving a magnetron while rotating the rotating antenna by an antenna motor, the microwave distribution in the heating chamber is increased. Non-uniformity is reduced.

  Further, as described in Patent Document 1, a rotatable antenna is provided on the upper part of the magnetron, and the antenna is rotated by the wind of the blower fan by applying cooling air from the blower fan to the blades of the rotary antenna. There has been proposed a microwave heating apparatus that changes the microwave distribution in the heating chamber.

  On the other hand, as described in Patent Document 2 which reduces the uneven heating of the object to be heated by microwave heating and reduces the cost and saves the space of the power feeding unit, it simply radiates circularly polarized waves into the heating chamber. A microwave heating apparatus having a single microwave radiating portion has been proposed.

JP 62-064093 A U.S. Pat. No. 4,301,347

  However, in the microwave heating apparatus such as the microwave oven having the above-described conventional configuration, it is required to efficiently heat an object to be heated with a simple structure as much as possible, and has been proposed so far. There were various problems with the structure.

In addition, microwave heating devices, particularly microwave ovens, have been developed for high-power technology, and a rated high-frequency output of 1000 W has been commercialized in Japan. Microwave ovens are notable for heating food by heat conduction, but the convenience of directly heating food using dielectric heating is a major feature of the product. The problem of non-uniform heating will become more apparent.

  The following two points can be cited as structural problems of the conventional microwave heating apparatus.

  The first point requires a mechanism for rotating the table or antenna in order to reduce non-uniform heating. Therefore, it is necessary to secure a rotation space and an installation space such as a motor for rotating the table or antenna. That was hindering the miniaturization of the range.

  The second point is that in order to stably rotate the table or antenna, it is necessary to provide the rotating antenna above or below the heating chamber, and the structure is limited.

  Installing a table or a phaser rotation mechanism in the microwave irradiation chamber of the microwave heating apparatus lowers the reliability. Therefore, there is a demand for a microwave heating apparatus that does not require these mechanisms.

  Further, circularly polarized light is radiated into the heating chamber as described in Patent Document 2 which reduces the uneven heating of the object to be heated by microwave heating and reduces the cost and saves the space of the power feeding unit. The microwave heating apparatus having a single microwave radiating portion has an advantage that it does not have a rotating mechanism, but the problem is that sufficient uniform heating by microwave heating has not been realized.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a microwave heating apparatus that can uniformly and highly efficiently heat an object to be heated without using a rotation mechanism.

  In order to solve the above-described conventional problems, a microwave heating apparatus according to the present invention supplies a heating chamber in which an object to be heated is placed, a placement unit on which the object to be heated is placed, and microwaves to the heating chamber. Microwave supply means, a waveguide for transmitting microwaves supplied from the microwave supply means, and one or more waveguide structure antennas for radiating microwaves to the heating chamber A termination portion for making the end of the waveguide structure antenna a fixed end and a microwave as a standing wave, and one or more for transmitting the microwave from the waveguide to the waveguide structure antenna And a plurality of microwave radiation openings for radiating from the waveguide structure antenna to the heating chamber.

  As a result, the microwave supplied from the microwave supply means and transmitted through the waveguide is guided to the waveguide structure antenna by the coupling axis, so that the microwave supply point is symmetrically connected to the waveguide structure antenna. By changing to a position where waves can be radiated, and radiating microwaves standing by the terminal from multiple microwave radiation openings, symmetric microwaves can be radiated efficiently and heated. A microwave heating apparatus that heats an object uniformly and with high efficiency can be provided.

According to the present invention, the microwave supplied from the microwave supply means and transmitted through the waveguide is guided to the waveguide structure antenna by the coupling axis, so that the microwave supply point is symmetrical from the waveguide structure antenna. It can be changed to a position where it can radiate microwaves, and microwaves standing by the end part are radiated from multiple microwave radiation openings to efficiently perform symmetrical microwave radiation. It is possible to provide a microwave heating apparatus that can uniformly and efficiently heat an object to be heated without using a rotation mechanism.

Sectional drawing and principal part top view of the microwave heating apparatus in Embodiment 1 of this invention The perspective view of the microwave heating apparatus in Embodiment 1 of this invention FIG. 3 is a diagram for explaining the relationship between a microwave radiation opening and a standing wave of the microwave heating apparatus according to Embodiment 1 of the present invention. The top view which shows the symmetry in the waveguide structure antenna in Embodiment 1 of this invention Sectional drawing and principal part top view which show the example at the time of using the multiple symmetry axis and multiple waveguide structure antenna in Embodiment 1 of this invention FIG. 5 is a diagram illustrating the relationship between the microwave radiation opening and the standing wave of the microwave heating apparatus according to Embodiment 2 of the present invention. The top view which shows the symmetry in the waveguide structure antenna in Embodiment 2 of this invention Sectional drawing and principal part top view which show the example at the time of using the multiple symmetry axis and multiple waveguide structure antenna in Embodiment 2 of this invention Schematic explaining the structure of the waveguide structure antenna in Embodiment 3 of this invention Sectional drawing and principal part top view of the microwave heating apparatus in Embodiment 4 of this invention Explanatory drawing of the relationship between the microwave radiation opening part and standing wave of the microwave heating apparatus in Embodiment 4 of this invention The schematic diagram which shows the example of the microwave radiation | emission opening part which radiates | emits the circularly polarized wave of the microwave heating apparatus in Embodiment 4 of this invention

  1st invention is the heating chamber which puts a to-be-heated material, the mounting part which mounts the said to-be-heated material, the microwave supply means for supplying a microwave to the said heating chamber, The said microwave supply means A waveguide for transmitting microwaves supplied from the antenna, one or more waveguide structure antennas for radiating microwaves to the heating chamber, and a terminal end of the waveguide structure antenna at a fixed end And a termination for making the microwave a standing wave, one or more coupling axes for transmitting microwaves from the waveguide to the waveguide structure antenna, and from the waveguide structure antenna to the By using a microwave heating apparatus having a plurality of microwave radiation openings for radiating into the heating chamber, the microwaves supplied from the microwave supply means and transmitted through the waveguide are guided through the waveguide structure by the coupling axis. Lead to antenna Therefore, the microwave supply point is changed from the waveguide structure antenna to a position where the microwave can be radiated with symmetry, and the microwaves made standing by the terminal portion are changed from the plurality of microwave radiation openings. By radiating, it is possible to provide a microwave heating apparatus that efficiently radiates a symmetrical microwave and heats an object to be heated uniformly and with high efficiency.

  According to a second aspect of the invention, in the first aspect of the invention, in particular, the microwave radiation opening is disposed in the vicinity of a node of a standing wave generated between the coupling axis and the terminal end. By setting it as an apparatus, the microwave heating apparatus which can perform the microwave radiation which improved more uniformity can be provided.

According to a third aspect of the present invention, in the first aspect of the invention, the microwave radiation opening may be a microwave heating device in which the microwave radiation opening is disposed in the vicinity of the antinode of the standing wave generated between the coupling shaft and the terminal end. It is possible to provide a microwave heating apparatus that can perform microwave radiation more efficiently.

  In a fourth aspect of the invention, in particular, in any one of the first to third aspects of the invention, the waveguide structure antenna is configured as a rectangular parallelepiped polyhedron, the microwave radiation opening is provided on the upper surface, and the waveguide is guided on the lower surface. A microwave heating device having a flange portion in contact with the tube structure, the flange portion being formed in parallel with the microwave transmission direction, prevents microwave leakage from other than the microwave radiation opening, and the waveguide It is possible to provide a microwave heating apparatus that realizes uniform heating with a simple configuration in which the structural antenna is not fixed to the heating chamber.

  In a fifth aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, the microwave heating device is configured so that the waveguide structure antenna has a symmetry axis. A microwave heating device that can be transmitted symmetrically and that improves the uniformity of the microwave radiation from the microwave radiation opening can be provided.

  In a sixth aspect of the present invention, in particular, in any one of the first to fifth aspects, the microwave radiation opening is a microwave heating device having a shape that radiates circularly polarized waves. The microwave which spreads from the part is radiated, and the microwave heating apparatus which makes the radiation of the microwave to the object to be heated uniform in a wider range can be provided.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a microwave heating apparatus according to the invention will be described with reference to the accompanying drawings. In the microwave heating apparatus of the following embodiment, a microwave oven will be described. However, the microwave oven is an example, and the microwave heating apparatus of the present invention is not limited to the microwave oven, and uses dielectric heating. And a microwave heating device such as a garbage processing machine or a semiconductor manufacturing device. Further, the present invention is not limited to the specific configurations of the following embodiments, and configurations based on similar technical ideas are included in the present invention.

(Embodiment 1)
FIG. 1 is a cross-sectional view of the microwave heating apparatus according to Embodiment 1 of the present invention. In FIG. 1, 101 is a housing, 102 is an object to be heated, 103 is a heating chamber, 104 is a placement portion, 105 is a microwave supply means, 106 is a waveguide, 107 is a waveguide structure antenna, and 108 is a coupling Reference numeral 109 denotes a microwave radiation opening, and 110 denotes a termination for making the microwave transmitted through the stationary end of the waveguide structure antenna 107 a fixed end. Has been placed. The mounting portion 104 is a glass plate, the microwave supply means 105 is a magnetron, the waveguide 106 is a rectangular waveguide, the waveguide structure antenna 107 is a rectangular parallelepiped, and the coupling axis 108 is a waveguide. A coaxial structure for transmitting microwaves transmitted through the tube 106 to the waveguide structure antenna 107, a microwave radiation opening 109 is an opening provided in the waveguide structure antenna 107, and a termination 110 is a waveguide structure antenna. This configuration can be easily realized by adopting a structure in which the end portion in the transmission direction of the microwave transmitted through 107 is closed by a metal plate.

  FIG. 2 is a perspective view of the microwave heating apparatus according to the first embodiment. In FIG. 2, reference numeral 201 denotes a door for taking the article to be heated 102 into and out of the heating chamber 103. The door 201 is formed to be openable and closable with respect to the housing 101.

3A is a schematic side view of the waveguide 106 and the waveguide structure antenna 107, and FIG. 3B is a schematic view of the microwave radiation opening 109 on the top surface of the waveguide structure antenna 107. In FIG. 3, the coupling shaft 108 is joined to the waveguide structure antenna 107, and a part of the coupling shaft 108 is inserted into the waveguide 106, so that the microwave transmitted through the waveguide 106 is transmitted to the waveguide structure antenna. The configuration is a microwave supply point to 107. Further, the waveguide structure antenna 107 transmits microwaves from the coupling axis 108, which is a microwave supply point, toward the terminal end 110, and the terminal end 110 becomes a fixed end, so that as shown in FIG. A standing wave 301 is formed. The microwave radiation opening 109 is an opening provided on the waveguide structure antenna 107 and radiates microwaves to the heating chamber 103. In the present embodiment, the center of gravity of the microwave radiating opening 109 is arranged at the node of the standing wave 301 generated in the waveguide structure of the waveguide structure antenna 107. .

  Hereinafter, the operation of the microwave heating apparatus will be described. When the object to be heated 102 is placed on the mounting portion 104 in the heating chamber 103 and a heating start instruction is given by the user, the microwave heating device moves from the magnetron serving as the microwave supply means 105 into the waveguide 106. To supply microwaves. The microwave transmitted through the waveguide 106 is transmitted to the waveguide structure antenna 107 through the coupling shaft 108 as shown in FIG. The transmitted microwave forms a standing wave 301 as a microwave power supply source that is uniformly arranged, as shown in FIG. Since the waveguide structure antenna 107 is closed at the terminal end 110, the amplitude at the terminal end 110 is fixed to 0, and the coupling shaft 108 side is a free end that indicates the maximum amplitude value. Here, assuming that the wavelength of the standing wave 301 is λn, the distance between the coupling axis 108 and the terminal portion 110 is c, and the standing wave mode is s (s: natural number) (for example, like the standing wave 301 shown in FIG. 3). , When there are three antinodes of the standing wave including the vicinity of the coupling axis 108 between the coupling axis 108 and the terminal end 110 s = 3), the standing wave wavelength λn is λn = 4c / (2s−1). It has a relationship. Here, since the standing wave mode generated in the waveguide structure antenna 107 can easily take a value close to the in-tube wavelength transmitted through the waveguide, the wavelength λn of the standing wave can be obtained from the above relationship by calculation. it can. However, it is more reliable to actually measure the amplitude in the waveguide antenna 107 for the actual accurate standing wave wavelength λn. Since the standing wave interval is half of the standing wave wavelength λn, if the microwave radiation opening 109 is arranged at an interval of (λn / 2), the energy source existing below the microwave radiation opening 109 is reduced. Since the standing waves 301 are arranged uniformly, it is easy to make the microwave radiation from the microwave radiation opening 109 uniform. In FIG. 3, the node of the standing wave 301 is a point where the amplitude becomes zero, and therefore the center of gravity of the microwave radiation opening 109 is the node of the standing wave generated between the coupling axis 108 and the terminal end 110. By being arranged in the vicinity, excessive output from the center of gravity of the microwave radiation opening 109 can be prevented, and microwave radiation to the object to be heated 102 can be made more uniform.

  As described above, in the present embodiment, the microwave supplied from the microwave supply means 105 and transmitted through the waveguide 106 is guided to the waveguide structure antenna 107 by the coupling shaft 108, thereby supplying the microwave. The point is changed to a position where the microwave can be emitted from the waveguide structure antenna 107 with symmetry, and the microwave is emitted from the plurality of microwave radiation openings 109, so that the microwave radiation having symmetry is obtained. The object to be heated can be heated uniformly. According to this configuration, the energy source existing below the microwave radiation opening 109 is uniformly arranged as the standing wave 301, and at a plurality of locations near the node of the standing wave that can prevent excessive microwave output. A microwave heating apparatus that can radiate from the dispersed openings and can uniformly heat the object to be heated 102 without using a rotating mechanism can be provided.

  Here, as shown in FIG. 4, the waveguide structure antenna 107 includes a left-right direction symmetry axis 401 and a depth-direction symmetry axis 402 in the left-right direction and the depth direction, respectively, so that the microwave is symmetrical with respect to the symmetry axis. It can be transmitted, and the uniformity of the microwave radiation from the microwave radiation opening can be improved.

  In the present embodiment, the opening shape of the microwave radiation opening 109 has been described with reference to the shape of FIG. 3, but the opening shape is not limited thereto.

  In the present embodiment, the case where there is one waveguide structure antenna 107 and one coupling axis 108 has been described. However, a microwave heating apparatus is configured using a plurality of waveguide structure antennas and coupling axes. Obviously it may be. For example, as shown in FIG. 5, by providing a plurality of waveguide structure antennas 107 and coupling shafts 108 and adjusting the amount of insertion of the coupling shaft 108 into the waveguide 106, a plurality of waveguide structure antennas 107 are provided. Therefore, it is possible to arrange the microwave radiation opening 109 so as to cover the entire heating chamber 103.

  In addition, when the uniformity of heating is not important, it is obvious that the arrangement of the microwave radiation opening 109 is not necessarily near the node of the standing wave 301.

(Embodiment 2)
6A and 6B are explanatory diagrams of the relationship between the microwave radiation opening and the standing wave of the microwave heating apparatus according to Embodiment 2 of the present invention, where FIG. 6A is a cross-sectional view, and FIG. 6B is a plan view. It is. In the drawings, the same reference numerals are given to portions showing the same operations as those in the first embodiment. The basic operation in the second embodiment is the same as that in the first embodiment. The operation and action will be described below.

  Here, the second embodiment is different from the first embodiment in that the arrangement position of the microwave radiation opening 109 is not in the vicinity of the node of the standing wave 301 but as shown in FIG. It is arranged in the vicinity of 301 abdomen. In FIG. 6, the antinode of the standing wave 301 is a point where the amplitude is maximum. Therefore, by arranging the center of gravity of the microwave radiation opening 109 in the vicinity of the antinode of the standing wave generated between the coupling shaft 108 and the terminal end 110, the microwave can be most easily transmitted from the microwave radiation opening 109. It is possible to perform microwave heating that further improves the heating efficiency of the object to be heated 102.

  As described above, in the present embodiment, the microwave supplied from the microwave supply means 105 and transmitted through the waveguide 106 is guided to the waveguide structure antenna 107 by the coupling shaft 108, thereby supplying the microwave. The point is changed to a position where the microwave can be emitted from the waveguide structure antenna 107 with symmetry, and the microwave is emitted from the plurality of microwave radiation openings 109, so that the microwave radiation having symmetry is obtained. The object to be heated can be heated uniformly. According to this configuration, the energy source existing below the microwave radiating opening 109 is uniformly arranged as the standing wave 301 and radiated from the openings dispersed in a plurality of locations near the antinode of the standing wave that is the maximum amplitude point. Accordingly, it is possible to provide a microwave heating apparatus that can uniformly heat the object to be heated 102 without using a rotating mechanism while improving the heating efficiency.

  Here, as shown in FIG. 7, the waveguide structure antenna 107 includes a left-right symmetric axis 701 and a depth-direction symmetric axis 702 in the left-right direction and the depth direction, respectively, so that the microwave is symmetrical with respect to the symmetric axis. It can be transmitted, and the uniformity of the microwave radiation from the microwave radiation opening can be improved.

  In the present embodiment, the opening shape of the microwave radiation opening 109 has been described with reference to the shape of FIG. 6, but is not limited to this opening shape.

In the present embodiment, the case where there is one waveguide structure antenna 107 and one coupling axis 108 has been described. However, a microwave heating apparatus is configured using a plurality of waveguide structure antennas and coupling axes. Obviously it may be. For example, as shown in FIG. 8, by providing a plurality of waveguide structure antennas 107 and coupling shafts 108 and adjusting the amount of insertion of the coupling shaft 108 into the waveguide 106, a plurality of waveguide structure antennas 107 are provided. Therefore, it is possible to arrange the microwave radiation opening 109 so as to cover the entire heating chamber 103.

(Embodiment 3)
FIG. 9 is a schematic perspective view of a waveguide structure antenna according to Embodiment 3 of the present invention. The operation and action will be described below. In the drawings, the same reference numerals are given to the portions showing the same operations as those in the first and second embodiments. The basic operation in the third embodiment is the same as in the first and second embodiments.

  In the present embodiment, as shown in FIG. 9, the waveguide structure antenna 107 is configured as a rectangular parallelepiped polyhedron, and the microwave radiation opening 109 is provided on the upper surface portion, as in the first embodiment. However, the waveguide structure antenna 107 in the third embodiment is structurally composed of a waveguide structure portion 901 and a flange portion 902, and this flange portion 902 is guided in parallel with the transmission direction of the microwave. The difference is that the tube structure portion 901 is formed so as to be in contact with the lower surface portion. Here, the distance from the point in contact with the waveguide structure portion 901 to the outer edge of the flange portion 902 is appropriately set (for example, the quarter of the oscillation wavelength of the microwave supply means 105 generally used as a choke structure for preventing microwave leakage). Therefore, even with a simple configuration in which the waveguide structure antenna 107 is not fixed to the heating chamber 103 and the waveguide 106, microwave leakage is suppressed and microwaves are transmitted into the waveguide structure antenna 107. It becomes possible to make it. Since the transmitted microwave forms a standing wave 301 by the terminal end portion 110, the energy source existing below the microwave radiation opening 109 is uniformly arranged as the standing wave 301. The microwave radiation from the radiation opening 109 can be made uniform and used for heating the object to be heated 102.

  As described above, in the present embodiment, the waveguide structure antenna 107 is configured as a rectangular parallelepiped polyhedron, the microwave radiation opening 109 is provided on the upper surface portion, and the flange contacting the waveguide structure on the lower surface portion. Since the flange portion 902 is formed in parallel with the microwave transmission direction, the microwave leakage is prevented and the waveguide structure antenna 107 is not fixed to the heating chamber 103. The waves 301 can be formed to achieve uniform heating.

  In the case of such a configuration, it goes without saying that the direction of the waveguide structure antenna 107 can be freely set. In this case, it is possible to manually set the object 102 in an appropriate direction. In addition, if the rotating means is introduced, the standing wave in the heating chamber generated in the heating chamber 103 is changed, so that the uniformity can be further improved.

(Embodiment 4)
FIG. 10 is a cross-sectional view and a plan view of a main part of the microwave heating apparatus according to the fourth embodiment of the present invention. FIG. 11 is a diagram illustrating a microwave radiation opening and a stationary position of the microwave heating apparatus according to the fourth embodiment of the present invention. It is a wave explanatory drawing. The operation and action will be described below. In the drawing, the same reference numerals are given to the portions showing the same operations as in the first to third embodiments. The basic operation in the present embodiment is the same as in the first to third embodiments.

In the present embodiment, the microwave radiation opening 109 is shaped to radiate circularly polarized waves as shown in FIGS. Circular polarization is a technique widely used in the field of mobile communication and satellite communication. Examples of familiar use include an ETC (Electronic Toll Collection System) “non-stop automatic toll collection system” and the like. Circular polarization is a microwave in which the polarization plane of the electric field rotates with respect to the traveling direction of the radio wave, and when the circular polarization is formed, the direction of the electric field continues to change with time. The radiation angle of the microwave radiated into the inside continues to change, and the electric field strength does not change with time. Thereby, compared with the microwave heating by the linearly polarized wave used in the conventional microwave heating apparatus, the microwave is dispersed and radiated over a wide range so that the object to be heated can be microwave heated uniformly. become. In particular, there is a strong tendency for uniform heating in the circumferential direction of circular polarization. Note that circularly polarized waves are classified into two types, that is, right-handed polarization (CW: clockwise) and left-handed polarization (CCW: counterclockwise) from the direction of rotation, but there is no difference in heating performance.

  The microwave heating apparatus of the present invention uses the standing wave 301, but when the microwave is radiated from the microwave radiation opening 109 and the standing wave balance is lost, the standing wave becomes stable again. A traveling wave is generated until it returns. Therefore, by making the microwave radiation opening 109 a circularly polarized radiation shape, it is possible to make the heating distribution in the heating chamber 103 more uniform by utilizing the above-described features. In order to output a circularly polarized wave from the microwave radiation opening 109 provided in the waveguide structure antenna 107, as shown in FIG. The shape inclined by 45 degrees with respect to the transmission direction 302 needs to be arranged at a position that does not pass through the tube axis 1101 in the microwave transmission direction 302 of the waveguide structure antenna 107.

  As described above, in the present embodiment, the microwave radiation opening 109 is shaped to radiate circularly polarized waves, so that microwaves having a spread from the microwave radiation part are radiated, and the object to be heated The microwave radiation to 102 can be made uniform over a wider range.

  In the present embodiment, the shape of the microwave radiation opening 109 that radiates circularly polarized waves has been described with reference to the shape shown in FIGS. 10 and 11. However, the shape is not limited to this shape, and is shown in FIG. Any shape that radiates circularly polarized waves can be used.

  In the present embodiment, the case where the microwave radiation opening 109 is placed near the node of the standing wave 301 has been described. However, the microwave radiation opening 109 as described in the second embodiment is fixed. Obviously, the present invention may be applied when placed near the antinode of the standing wave 301.

  As described above, since the microwave heating apparatus of the present invention can uniformly irradiate an object to be heated, it can be effectively used for a microwave heating apparatus that performs heating processing or sterilization of food. In the present invention, the microwave device has been described as a microwave device that can uniformly heat an object to be heated without using a rotating mechanism. However, a heating chamber constant generated in the heating chamber by introducing the rotating mechanism is described. It is also possible to improve uniformity by making the standing wave more complex.

DESCRIPTION OF SYMBOLS 102 Object to be heated 103 Heating chamber 104 Placement part 105 Microwave supply means 106 Waveguide 107 Waveguide structure antenna 108 Coupling axis 109 Microwave radiation opening part 110 Termination part 301 Standing wave 302 Microwave transmission direction 401 Left-right direction Symmetry axis 402 Depth direction symmetry axis 701 Left / right direction symmetry axis 702 Depth direction symmetry axis 901 Waveguide structure portion 902 Flange portion 1101 Tube axis

Claims (6)

A heating chamber for storing the object to be heated;
A placement section for placing the object to be heated;
Microwave supply means for supplying microwaves to the heating chamber;
A waveguide for transmitting microwaves supplied from the microwave supply means;
One or more waveguide structure antennas for radiating microwaves into the heating chamber;
A termination for making the end of the waveguide structure antenna a fixed end and a microwave as a standing wave, and one or more couplings for transmitting the microwave from the waveguide to the waveguide structure antenna The axis,
A microwave heating apparatus comprising a plurality of microwave radiation openings for radiating from the waveguide structure antenna to the heating chamber. The microwave heating device according to claim 1, wherein the microwave radiation opening is disposed in the vicinity of a node of a standing wave generated between the coupling axis and the terminal end. The microwave heating device according to claim 1, wherein the microwave radiation opening is disposed in the vicinity of an antinode of a standing wave generated between the coupling axis and the terminal end. The waveguide structure antenna is configured as a rectangular parallelepiped polyhedron, provided with a microwave radiation opening on the upper surface portion, and provided with a flange portion in contact with the waveguide structure on the lower surface portion, and the flange portion is parallel to the microwave transmission direction. The microwave heating device according to any one of claims 1 to 3, wherein the microwave heating device is formed. The microwave heating apparatus according to any one of claims 1 to 4, wherein the waveguide structure antenna is configured to have an axis of symmetry. The microwave heating apparatus according to any one of claims 1 to 5, wherein the microwave radiation opening has a shape that radiates circularly polarized waves.