JP7505588B2 - Heating electromagnetic wave control body and article with heating electromagnetic wave control body - Google Patents

Description

The present invention relates to a heating electromagnetic wave control body used in an apparatus for heating an article with a heating electromagnetic wave, and an article equipped with a heating electromagnetic wave control body.

Patent Document 1 discloses a device for packaging used in microwave ovens that is designed to brown food and heat it in a balanced manner by providing microwave-shielding areas, microwave-transmitting areas, and areas that absorb and generate heat.

The device shown in Patent Document 1 is used by placing it over the rice cake to be heated. This device blocks microwaves with an aluminum foil shield, with openings in the aluminum foil as microwave transmission areas, and is equipped with a heating element made of a mixture of alumina and aluminum and other metals, and is configured to directly heat the rice cake with Joule heat from eddy currents in the heating element.

JP 2005-351486 A

The device described in Patent Document 1 has the following problems:

- The heating element needs to be in contact with the food so that the heat can be transferred directly to the food, which means the food tends to stick to the heating element.

- Since the utensils come into direct contact with food, there are concerns about hygiene.

- The heating element that promotes heating becomes very hot, increasing the risk of burns when removing the food from the microwave.

- Microwaves are blocked from areas where heating is desired to be suppressed, resulting in reduced overall thermal efficiency.

- Since metal is used for the heating element and shielding, there is a concern that the metal may heat up and burn.

Therefore, the object of the present invention is to provide a heating electromagnetic wave control body and an article with a heating electromagnetic wave control body that receives heating electromagnetic waves and controls the electromagnetic waves irradiated to an article to be heated, thereby enabling selective heating or non-heating of the article.

The heating electromagnetic wave control body of the present invention is a heating electromagnetic wave control body that is placed inside an electromagnetic wave heating device together with an item to be heated by the electromagnetic wave heating device and controls the electromagnetic waves irradiated to the item, and is equipped with a plurality of antennas, and has areas between these antennas that are more easily or less easily heated than other areas.

The article with a heating electromagnetic wave control body of the present invention comprises an article to be heated by an electromagnetic wave heating device, and a heating electromagnetic wave control body that is placed inside the electromagnetic wave heating device together with the article and controls the electromagnetic waves irradiated to the article, and the heating electromagnetic wave control body has a plurality of antennas, and between these multiple antennas there are areas that are more easily heated or less easily heated than other areas.

According to the present invention, by receiving electromagnetic waves for heating and controlling the electromagnetic waves irradiated to an item to be heated, the item is selectively heated or not heated, thereby achieving the following effects:

- Because the heating electromagnetic wave control device utilizes the re-radiation of an antenna, there is no need to bring the antenna into contact with the item, which prevents the item from sticking.

- Because the heating electromagnetic wave control device utilizes antenna re-radiation, it is possible to selectively heat items without generating high temperature areas like a heating element, improving safety.

- Since the heating electromagnetic wave control body does not come into direct contact with the item, there are no hygiene concerns when the item is food, etc.

- Since there is no heating element to promote heating, there are no problems caused by the heating element becoming too hot.

- Since the heating electromagnetic waves are not blocked, the overall thermal efficiency does not decrease.

- The radiation efficiency of the radiator is high, so heat generation from the radiator can be reduced.

FIG. 1 is a diagram showing a heated state of an article 201 with a heating electromagnetic wave control element according to the first embodiment. Fig. 2(A) is a perspective view of an article 201 with a heating electromagnetic wave control body, and Fig. 2(B) is a longitudinal sectional view thereof. 3A and 3B are perspective views showing examples of the interval between the first antenna 11 and the second antenna 12. FIG. FIG. 4A shows an example in which food to be heated with high efficiency is placed in the selective heating section, and FIG. 4B shows an example in which non-heated food is placed in the selective non-heating section. FIG. 5 is a diagram showing the relationship between the electromagnetic waves in the interior 55 of the electromagnetic wave heating device 300 and the electromagnetic waves received and re-radiated from the antenna. FIG. 6 is a diagram showing the intensity of the electric field at a distance D between the first antenna 11 and the second antenna 12. As shown in FIG. FIG. 7 is a diagram showing the intensity of the electric field at a distance D between the first antenna 11 and the second antenna 12. As shown in FIG. FIG. 8 is a perspective view showing an example of the size of the first antenna 11 and the second antenna 12. As shown in FIG. 9A, 9B, and 9C are partial cross-sectional views each showing a support structure for an antenna. 10A and 10B are perspective views of two antennas constituting a heating electromagnetic wave control body according to the second embodiment. FIG. 11 is a perspective view of two antennas constituting another heating electromagnetic wave control body according to the second embodiment. Fig. 12(A), Fig. 12(B), and Fig. 12(C) are plan views of one antenna provided in a heating electromagnetic wave control body according to the third embodiment. Fig. 12(D) is a perspective view of one antenna provided in a heating electromagnetic wave control body according to the third embodiment. FIG. 13 is a vertical cross-sectional view of an article 204A with a heating electromagnetic wave control element. FIG. 14 is a perspective view of the articles 204B and 204C equipped with heating electromagnetic wave control elements. FIG. 15 is a perspective view showing the arrangement of the heating electromagnetic wave control body consisting of the first antenna 11 and the second antenna 12. As shown in FIG. FIG. 16 is a diagram showing the temperature distribution in the YZ plane at the center of the space when the distance D between the first antenna 11 and the second antenna 12 is changed. FIG. 17 is a perspective view showing the arrangement of a heating electromagnetic wave control body consisting of a first antenna 11 and a second antenna 12. As shown in FIG. FIG. 18 is a diagram showing the temperature distribution in the YZ plane at the center of the space when the distance D between the first antenna 11 and the second antenna 12 is changed. FIG. 19 is a vertical sectional view of a structure to be measured according to the sixth embodiment. FIG. 20A shows the measurement results for the structure to be measured of the sixth embodiment, and FIG. 20B shows the measurement results for the structure to be measured as a comparative example.

Hereinafter, several specific examples will be given with reference to the drawings to show multiple forms for implementing the present invention. The same symbols are used for the same parts in each drawing. For convenience, the embodiments are shown separately, taking into consideration ease of explanation or understanding of the main points, but partial substitution or combination of configurations shown in different embodiments is possible. From the second embodiment onwards, description of matters common to the first embodiment will be omitted, and only the differences will be described. In particular, similar effects resulting from similar configurations will not be mentioned in each embodiment.

First Embodiment
1 is a diagram showing the heated state of an article 201 with a heating electromagnetic wave control unit according to the first embodiment. The article 201 with a heating electromagnetic wave control unit is placed in an interior 55 of an electromagnetic wave heating device (microwave oven) 300. The electromagnetic wave heating device 300 includes a high-voltage transformer 51, a magnetron 52, an antenna 53, a waveguide 54, an interior 55, a turntable 56, and the like.

The magnetron 52 generates microwaves using high voltage from the high voltage transformer 51 as a power source. The microwaves emitted from the antenna 53 propagate through the waveguide 54 and are irradiated into the interior 55. The article 201 with an electromagnetic wave control body for heating receives the microwaves and generates heat. The arrangement of the components of the electromagnetic wave heating device 300, such as the magnetron 52 and the interior 55, is not limited to that shown in FIG. 1. For example, the magnetron 52 and the waveguide 54 may be located below or both above and below the interior 55.

Figure 2(A) is a perspective view of an article 201 with an electromagnetic wave control body for heating. Figure 2(B) is its longitudinal cross-sectional view.

The item 201 with a heating electromagnetic wave control body comprises an item 100 and a heating electromagnetic wave control body 101. The item 100 is, for example, a lunch box packed in a resin container.

The heating electromagnetic wave control body 101 is composed of a first antenna 11 and a second antenna 12. The resin container is a resin molded body such as PP (polypropylene) or PS (polystyrene), and the first antenna 11 and the second antenna 12 are conductor patterns formed, for example, by patterning an aluminum vapor deposition film or aluminum foil.

The first antenna 11 and the second antenna 12 receive the electromagnetic waves radiated by the electromagnetic wave heating device 300 shown in Figure 1 and re-radiate the electromagnetic waves. The electromagnetic waves in the interior 55 of the electromagnetic wave heating device 300, the electromagnetic waves re-radiated by the first antenna 11, and the electromagnetic waves re-radiated by the second antenna 12 interfere with each other. This interference strengthens the amplitude of the electromagnetic waves in the region Z1 between the first antenna 11 and the second antenna 12 compared to the amplitude of the electromagnetic waves in the region ZA. In other words, the region Z1 between the first antenna 11 and the second antenna 12 is more easily heated than the other region ZA.

The first antenna 11 and the second antenna 12 are both circular or approximately circular conductors and are provided in the packaging body 21.

The first antenna 11 and the second antenna 12 face each other and overlap when viewed in a plane in the direction of opposition.

Figures 3(A) and 3(B) are perspective views showing examples of the distance between the first antenna 11 and the second antenna 12. In the example shown in Figure 3(A), the distance D between the opposing first antenna 11 and second antenna 12 is greater than half the wavelength (λ/2) of the electromagnetic wave and less than one wavelength (λ). In the example shown in Figure 3(B), the distance D between the opposing first antenna 11 and second antenna 12 is less than half the wavelength (λ/2) of the electromagnetic wave.

The distance D between the first antenna 11 and the second antenna 12 when compared to the wavelength of the electromagnetic wave may differ from the actual physical length due to the wavelength shortening effect caused by the dielectric and magnetic permeability of the material between the first antenna 11 and the second antenna 12.

As will be described later, if the distance between the first antenna 11 and the second antenna 12 is as shown in Figure 3(A), the region sandwiched between the first antenna 11 and the second antenna 12 is a selectively heated portion. This selectively heated portion has a higher heating efficiency than other regions. Also, if the distance D between the first antenna 11 and the second antenna 12 is as shown in Figure 3(B), the region sandwiched between the first antenna 11 and the second antenna 12 is a selectively non-heated portion. This selectively non-heated portion has a lower heating efficiency than other regions.

Figure 4 (A) is an example in which ingredients to be heated with high efficiency are placed in the selective heating section, and Figure 4 (B) is an example in which non-heated ingredients are placed in the selective non-heating section. In the selective heating section, ingredient F1 is heated with high efficiency, while ingredient F2 is heated with low efficiency in the selective non-heating section.

Figure 5 is a diagram showing the relationship between the electromagnetic waves in the interior 55 of the electromagnetic wave heating device 300 and the electromagnetic waves that are received and re-radiated from an antenna (first antenna 11 in this example). The thick arrow in Figure 5 indicates the electric field direction of the electromagnetic waves (incident waves) in the interior 55, and the thin arrow indicates the electric field direction of the electromagnetic waves re-radiated by the first antenna 11.

In the cross section, in the area Z0 near the first antenna 11, electromagnetic waves (electromagnetic waves with a phase difference of approximately 180 degrees) whose electric field is oriented in a direction that cancels the electric field of the incident wave are re-radiated. As a result, the electric field strength in the area Z0 near the first antenna 11 is weakened.

On the other hand, in region Z01, which is about λ/2 away from the first antenna 11, the electric field direction of the electromagnetic wave re-radiated from the first antenna 11 is aligned with the electric field direction of the incident wave (is in phase), and the electric field strength in region Z01 increases.

Figures 6 and 7 are diagrams showing the electric field strength at the distance D between the first antenna 11 and the second antenna 12.

As shown in Figure 6, if the distance D between the first antenna 11 and the second antenna 12 is greater than λ/2 and less than λ, the region Z1 in which the electromagnetic wave re-radiated from the first antenna 11 and the electromagnetic wave of the incident wave are in phase or nearly in phase expands.

On the other hand, as shown in Figure 7, if the distance D between the first antenna 11 and the second antenna 12 is λ/2 or less, a region Z2 is formed between the first antenna 11 and the second antenna 12, in which the electromagnetic wave re-radiated from the first antenna 11 and the electromagnetic wave of the incident wave are in opposite phase or nearly in opposite phase.

Figure 8 is a perspective view showing an example of the size of the first antenna 11 and the second antenna 12. In this example, the diameter φ of the circular first antenna 11 and the second antenna 12 is greater than or equal to ¼ wavelength and less than or equal to ¾ wavelength of the electromagnetic wave (3λ/4 ≧ φ ≧ λ/4). With this size, the size in the planar direction of the first antenna 11 and the second antenna 12 becomes close to ½ the wavelength of the electromagnetic wave, and the electromagnetic wave is re-radiated from the first antenna 11 and the second antenna 12 with high efficiency.

9(A), 9(B), and 9(C) are partial cross-sectional views showing the support structure of the antenna. In the example shown in FIG. 9(A), the first antenna 11 is supported by an insulating substrate 22. For example, the insulating substrate 22 is an electrical insulator, such as a resin film of PET (polyethylene terephthalate), PE (polyimide), or LCP (liquid crystal polymer). The first antenna 11 is, for example, an aluminum vapor deposition film or aluminum foil. In the example shown in FIG. 9(B), an adhesive layer 24 is formed on one side of the first antenna 11. In the example shown in FIG. 9(C), the first antenna 11 is formed on the first surface of the insulating substrate 22, and the adhesive layer 24 is formed on the second surface of the insulating substrate 22.

In Fig. 9(A), the insulating substrate 22 is, for example, a package in which the antenna is formed to package an article. The first antenna 11 with the adhesive layer 24 shown in Fig. 9(B) and Fig. 9(C) is attached, for example, to a package or container in which an article is packaged.

The above example shows the first antenna 11, but the same applies to other antennas such as the second antenna 12.

This embodiment provides the following effects:

(a) It is possible to set selective heating sections of an item. It is also possible to set selective non-heating sections of an item.

(b) There is no need to bring the heating electromagnetic wave control body into contact with the item, so the two do not stick to each other.

(c) Since heating is promoted by re-radiation from the antenna, it is possible to selectively heat food without placing it in close proximity to a "heating element" that generates heat by itself, thereby improving safety.

(d) Since it does not block input electromagnetic waves, energy utilization efficiency is high.

Second Embodiment
In the second embodiment, an antenna having a different shape from the antenna provided in the heating electromagnetic wave control body described above will be illustrated.

Figures 10(A) and 10(B) are perspective views of two antennas constituting a heating electromagnetic wave control body according to the second embodiment. The heating electromagnetic wave control body shown in Figure 10(A) is composed of a first antenna 11 and a second antenna 12, with the first antenna 11 being a ring-shaped conductor having an opening AP and the second antenna 12 being a circular conductor. In the heating electromagnetic wave control body shown in Figure 10(B), both the first antenna 11 and the second antenna 12 are ring-shaped conductors having an opening AP.

Figure 11 is a perspective view of two antennas constituting another heating electromagnetic wave control body according to the second embodiment. The heating electromagnetic wave control body shown in Figure 11 is composed of a first antenna 11 and a second antenna 12, where the first antenna 11 is a conductor having a circular outer shape and multiple openings AP, and the second antenna 12 is a circular conductor.

In this way, any or all of the multiple antennas constituting the heating electromagnetic wave control body may have openings. If the heating electromagnetic wave control body shown in Figures 10(A), 10(B), and 11 is applied to the heating electromagnetic wave control body 101 shown in Figures 2(A) and 2(B), the effect is that the visibility of the inside of the resin container of the article 201 with the heating electromagnetic wave control body is not hindered.

In particular, rather than forming a large opening, by distributing multiple small openings as in the example shown in Figure 11, the impact of providing the openings on the operation of the antenna can be reduced.

Third Embodiment
In the third embodiment, an antenna having a different shape from the antenna provided in the heating electromagnetic wave control body described above will be illustrated.

Figures 12(A), 12(B), and 12(C) are all plan views of one antenna provided in a heating electromagnetic wave control body according to the third embodiment. Also, Figure 12(D) is a perspective view of one antenna provided in a heating electromagnetic wave control body according to the third embodiment.

The antenna may be linear or rod-shaped as shown in Fig. 12(A), rectangular as shown in Fig. 12(B), elliptical or oval as shown in Fig. 12(C), or three-dimensional, such as a dome-shaped antenna as shown in Fig. 12(D).

This embodiment can achieve a wide variety of uneven heating effects. It can also be easily attached to curved surfaces.

Fourth embodiment
In the fourth embodiment, some examples of the arrangement of the heating electromagnetic wave control body in the product with the heating electromagnetic wave control body will be shown.

Figure 13 is a longitudinal cross-sectional view of an item 204A with a heating electromagnetic wave control body. The item 204A with a heating electromagnetic wave control body includes a heating electromagnetic wave control body 104 with a first antenna 11 and a second antenna 12, and an item 100. The item 100 is, for example, a lunch box packed in a resin container. The first antenna 11 is provided on the inner surface of the cover of the resin container, and the second antenna 12 is provided on the inner surface of the main body of the resin container. In this way, the multiple antennas constituting the heating electromagnetic wave control body may be disposed inside the item 100. In the example shown in Figure 13, the distance D between the first antenna 11 and the second antenna 12 is D≦λ/2, and the area Z2 between the first antenna 11 and the second antenna 12 has a poor heating efficiency compared to the other area ZA. In other words, the area Z2 between the first antenna 11 and the second antenna 12 is less likely to be heated than the other area ZA. In other words, the heating electromagnetic wave control body 104 is provided in a selectively non-heated section.

Figure 14 is a perspective view of articles 204B and 204C with a heating electromagnetic wave control body. Both articles 204B and 204C with a heating electromagnetic wave control body are provided with a first antenna 11 and a second antenna 12 on opposing side surfaces of the article 100, rather than on the top and bottom surfaces of the article 100. In this way, a heating electromagnetic wave control body can also be formed by multiple antennas arranged on the sides of the article 100.

Fifth embodiment
In the fifth embodiment, a simulation result is shown regarding the heating/non-heating effect depending on the difference in the distance D between the first antenna 11 and the second antenna 12 that constitute a heating electromagnetic wave control body.

Figure 15 is a perspective view showing a heating electromagnetic wave control body consisting of a first antenna 11 and a second antenna 12 placed in the center of a space with a width Wx = 300 mm, a depth = 300 mm, and a height H = 400 mm. The first antenna 11 and the second antenna 12 are circular conductors with a diameter of 60 mm. The temperature distribution in this space was simulated under the condition that an electromagnetic wave with a plane wave propagation direction in the +X direction and a polarization direction in the Y direction is incident on this space.

Figure 16 shows the temperature distribution in the YZ plane at the center of the space when the distance D between the first antenna 11 and the second antenna 12 is changed. Here, the lower the concentration, the higher the temperature. Since the frequency of the electromagnetic wave is 2.45 GHz, λ ≒ 120 mm.

When D≦λ/2, such as D=20 mm, D=40 mm, and D=60 mm, the electric field strength of the area sandwiched between the first antenna 11 and the second antenna 12 is weak. Therefore, the area sandwiched between the first antenna 11 and the second antenna 12 acts as a selective non-heated area.

On the other hand, when λ>D>λ/2, such as D=80 mm, D=100 mm, and D=120 mm, the electric field strength in the area sandwiched between the first antenna 11 and the second antenna 12 is strong. Therefore, the area sandwiched between the first antenna 11 and the second antenna 12 acts as a selective heating area.

Figure 17 is a perspective view showing a heating electromagnetic wave control body consisting of a first antenna 11 and a second antenna 12 placed in the center of a space with width Wx = 300 mm, depth = 300 mm, and height H = 400 mm. The first antenna 11 is a ring-shaped conductor with an inner diameter of 40 mm and an outer diameter of 60 mm, and the second antenna 12 is a circular conductor with a diameter of 60 mm. Other than the shape of the first antenna 11, the configuration is the same as that shown in Figure 15.

Figure 18 shows the temperature distribution in the YZ plane at the center of the space when the distance D between the first antenna 11 and the second antenna 12 is changed, similar to the example shown in Figure 16.

When D≦λ/2, such as D=20 mm, D=40 mm, and D=60 mm, the electric field strength of the area sandwiched between the first antenna 11 and the second antenna 12 is weak. Therefore, the area sandwiched between the first antenna 11 and the second antenna 12 acts as a selective non-heated area.

On the other hand, when λ>D>λ/2, such as D=80 mm, D=100 mm, and D=120 mm, the electric field strength in the area sandwiched between the first antenna 11 and the second antenna 12 is strong. Therefore, the area sandwiched between the first antenna 11 and the second antenna 12 acts as a selective heating area.

Sixth embodiment
In the sixth embodiment, the heating suppression effect by a heating electromagnetic wave control body will be illustrated.

Figure 19 is a longitudinal cross-sectional view of the structure to be measured according to the sixth embodiment. In Figure 19, the dummy food F is a member made of FR4 in which four plates are combined in a cross shape. Each plate has a width of 50 mm and a height of 40 mm. The first antenna 11 is a ring-shaped conductor with an inner diameter of 40 mm and an outer diameter of 60 mm, and the second antenna 12 is a circular conductor with a diameter of 60 mm. An insulating plate 100U simulating the upper exterior of an object is arranged on the top of the first antenna 11, and an insulating plate 100B simulating the lower exterior of an object is arranged on the bottom of the second antenna 12. These structures are placed on the turntable 56 of the microwave oven. Thus, since the distance D between the first antenna 11 and the second antenna 12 is ≦ λ / 2, the area sandwiched between the first antenna 11 and the second antenna 12 is a selectively non-heated area.

Figure 20 (A) shows the results of a thermo camera measurement of the measured structure of this embodiment, and Figure 20 (B) shows the results of a thermo camera measurement of a measured structure as a comparative example. The measured structure of this comparative example does not have the first antenna 11 or the second antenna 12. In this example, the temperature rise when heated at 1800 W for 15 seconds was measured. Note that, to make the structure easier to see, the measurement was performed with the first antenna 11 and the insulator plate 100U removed after heating.

In the comparative example, the temperature rise of the dummy food F is 23.9°C at the top, 28.6°C at the center, and 36.1°C at the bottom, whereas in this embodiment, the temperature rise of the dummy food F is 22.7°C at the top, 18.7°C at the center, and 15.9°C at the bottom. Compared to the comparative example, the temperature rise ratio of the dummy food F in this embodiment is 22.7/23.9 = 0.95 at the top, 18.7/28.6 = 0.65 at the center, and 15.9/36.1 = 0.44 at the bottom. Thus, according to this embodiment, a heating suppression effect of approximately 45% is obtained.

Finally, the description of the above-mentioned embodiments is illustrative in all respects and is not restrictive. Those skilled in the art may make appropriate modifications and changes. The scope of the present invention is indicated by the claims, not by the above-mentioned embodiments. Furthermore, the scope of the present invention includes modifications from the embodiments within the scope of the claims and the scope equivalent thereto.

For example, in each of the embodiments described above, an example has been shown in which the first antenna 11 and the second antenna 12 entirely overlap when viewed in a plane in the opposing direction, but the first antenna 11 and the second antenna 12 may be configured to partially overlap when viewed in a plane.

In addition, in each of the embodiments described above, an example is shown in which a first antenna 11 and a second antenna 12 each have the same external shape, but the external shapes of each antenna may be different.

In addition, in the example shown in Figure 2, the heating electromagnetic wave control body 101 is formed on a packaging body that covers the container of the item, but the heating electromagnetic wave control body 101 may also be formed on a label or sticker that is affixed to the container of the item.

In addition, the heating electromagnetic wave control body need not necessarily be provided in a container that holds an item, but may be placed directly on the selectively heated object or the selectively non-heated object.

In addition, the heating electromagnetic wave control body need not necessarily be provided on a container or packaging body, but may also be provided on a cover or the like that is placed over the target item.

For example, the conductor pattern as a radiator may be formed by printing a conductive paste in addition to patterning a metal foil.

AP...Opening F...Dummy food ingredients F1, F2...Food ingredient Z0...Nearby area Z01...Areas Z1, Z2...Area 11...First antenna 12...Second antenna 21...Packaging body 22...Insulating substrate 24...Adhesive layer 51...High-voltage transformer 52...Magnetron 53...Antenna 54...Waveguide 55...Interior 56...Turntable 100...Items 100B, 100U...Insulating plate 101, 104...Heating electromagnetic wave control body 201, 204A, 204B, 204C...Item 300 with heating electromagnetic wave control body...Electromagnetic wave heating device

Claims (11)

A heating electromagnetic wave control unit that is placed inside an electromagnetic wave heating device together with an article to be heated by the electromagnetic wave heating device and controls electromagnetic waves irradiated to the article,
Equipped with multiple antennas,
the plurality of antennas face each other and have overlapping portions in a plan view in the facing direction,
a distance between two of the plurality of antennas facing each other is less than one wavelength of the electromagnetic wave;
Between the plurality of antennas, there is a region that is more easily heated or less easily heated than other portions,
Electromagnetic wave control unit for heating. Each of the plurality of antennas is composed of a substantially circular conductor.
The heating electromagnetic wave control body according to claim 1 . At least one of the plurality of antennas facing each other has an opening.
The heating electromagnetic wave control body according to claim 2 . Among the plurality of antennas, the distance between two mutually opposing antennas is equal to or less than half the wavelength of the electromagnetic wave.
4. The heating electromagnetic wave control body according to claim 1 . Among the plurality of antennas, the distance between two mutually opposing antennas is greater than half the wavelength of the electromagnetic wave and less than one wavelength.
4. The heating electromagnetic wave control body according to claim 1 . The diameter of the antenna is equal to or greater than ¼ wavelength of the electromagnetic wave, and equal to or less than ¾ wavelength.
6. The heating electromagnetic wave control body according to claim 4 or 5 . The plurality of antennas are disposed at two locations on either side of a predetermined location of the article.
7. The heating electromagnetic wave control body according to claim 4 . The plurality of antennas are formed on a packaging body that packages the article.
The heating electromagnetic wave control body according to any one of claims 1 to 7 . The plurality of antennas are formed on an insulating substrate attached to the article.
The heating electromagnetic wave control body according to any one of claims 1 to 7 . A heating electromagnetic wave control unit that is placed inside an electromagnetic wave heating device together with an article to be heated by the electromagnetic wave heating device and controls electromagnetic waves irradiated to the article,
Equipped with multiple antennas,
Between the plurality of antennas, there is a region that is more easily heated or less easily heated than other portions,
Each of the plurality of antennas is formed of a substantially circular conductor,
At least one of the plurality of antennas facing each other has an opening.
Electromagnetic wave control unit for heating. An article to be heated by an electromagnetic wave heating device, and a heating electromagnetic wave control body that is disposed inside the electromagnetic wave heating device together with the article and controls the electromagnetic waves irradiated to the article,
The heating electromagnetic wave control body includes a plurality of antennas, the plurality of antennas facing each other and having overlapping portions in a planar view in the facing direction, the distance between two of the plurality of antennas facing each other is less than one wavelength of the electromagnetic wave, and the plurality of antennas have an area between them that is more easily heated or less easily heated than other areas.
An item with an electromagnetic wave control device for heating.

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