Dual-source antenna for microwave oven heating

Abstract

The utility model discloses a dual-source antenna used for microwave oven heating, comprising two antenna units arranged on a microwave oven, each antenna unit comprises a radiation main body used for radiation, an isolation cavity used for blocking a coupling path between the antenna units, and a connector; the radiation main body is arranged in the isolation cavity, and a microwave signal is fed in from the connector and transmitted to the radiation main body; and the radiation main body and the isolation cavity are all-metal low-profile structures. The microwave oven can realize high-efficiency uniform heating.

Description

Technical Field

[0001] This utility model relates to the field of microwave oven heating technology, specifically to a dual-source antenna for microwave oven heating. Background Technology

[0002] The principle of microwave oven heating is mainly based on the non-thermal and thermal effects of microwaves. The electromagnetic waves generated by 2.45GHz form standing waves in the oven cavity. The electromagnetic waves interact with water molecules in the food, causing the water molecules to vibrate at high frequency and generate heat energy, thereby heating and defrosting the food.

[0003] Traditional single-source microwave ovens are prone to hot and cold spots due to their single emission path. They mainly rely on a single magnetic control as the microwave source, and although their output power is high, they suffer from uneven heating and limited power adjustment. As consumers' demands for cooking diversity and efficiency increase, single-source systems can hardly meet the needs of complex scenarios. Therefore, a dual-source antenna coordination technology for microwave ovens is needed. Utility Model Content

[0004] In view of this, the present invention provides a dual-source antenna for microwave oven heating, which can achieve high-efficiency and uniform heating in microwave ovens.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A dual-source antenna for microwave oven heating includes two antenna elements disposed on the microwave oven. Each antenna element includes a radiating body for radiation, an isolation cavity for blocking the coupling path between the antenna elements, and a connector.

[0007] The radiating element is housed within the isolation cavity, and microwave signals are fed in from the connector and transmitted to the radiating element; both the radiating element and the isolation cavity are all-metal low-profile structures.

[0008] Furthermore, the isolation cavity includes a grounding plane and a bowl-shaped isolation cavity. The bowl-shaped isolation cavity has an outwardly extending edge at its upper end and an inwardly extending connecting flange at its lower end. The grounding plane is fixedly connected to the connecting flange, and a through hole is provided at the center of the grounding plane. The height of the bowl-shaped isolation cavity is less than one-tenth of a microwave wavelength, and the height of the bowl-shaped isolation cavity is greater than the height of the radiating body.

[0009] Furthermore, the radiating body includes a planar metal sheet, a short-circuit metal sheet, and a feed post;

[0010] The planar metal sheet is parallel to the grounding plane, and the planar metal sheet and the grounding plane are connected by a short-circuit metal sheet; the feed post is vertically arranged on the surface of the planar metal sheet, and is connected to the microwave feed port of the connector through a through hole in the center of the grounding plane; the angle between the inner side of the short-circuit metal sheet and the surface on the planar metal sheet where the feed post is located is an obtuse angle.

[0011] Furthermore, two antenna units are mounted on top of the microwave oven.

[0012] Furthermore, the radiating bodies of both antenna units are placed in the same direction, with the planar metal sheet of the radiating body extending towards the microwave oven door.

[0013] Furthermore, the edge of the upper end of the bowl-shaped isolation cavity is integrated with the top of the microwave oven on the same plane.

[0014] Furthermore, the straight-line distance between the two antenna elements is not less than 1 / 2 wavelength and not greater than 1.6 times the wavelength.

[0015] Furthermore, both the radiation body and the isolation cavity are made of aluminum alloy.

[0016] Beneficial effects:

[0017] 1. This utility model adds an isolation cavity outside the radiating body to block the coupling path between antenna elements and improve the isolation between antennas. At the same time, it can realize the superposition of dual-source microwave fields inside the microwave oven, and the dual-source antennas work together to cover more areas inside the cavity, thereby improving heating uniformity and increasing heating efficiency.

[0018] Secondly, the radiating body and isolation cavity of this utility model adopt an all-metal structure, which makes the antenna resistant to high temperature and corrosion, and its low profile characteristics are suitable for integration with microwave ovens, saving space.

[0019] 2. The height of the radiating body of this utility model is lower than that of the isolation cavity, that is, the radiating body is smaller than the isolation cavity as a whole and is wrapped by the isolation cavity, which can better block the coupling path of the two radiating bodies.

[0020] 3. The angle between the inner side of the short-circuit metal sheet and the surface where the feed post of the planar metal sheet is located is an obtuse angle. This is an optimized design that achieves high integration with the isolation cavity while avoiding the connector connection position, adapting to its low profile structure, and covering the required frequency band.

[0021] 4. The upper edge of the bowl-shaped isolation cavity of this utility model is integrated with the top of the microwave oven on the same plane, which facilitates installation. Attached Figure Description

[0022] Figure 1 This is a full view of the radiating body of this utility model.

[0023] Figure 2 This is a rear view of the radiating body of this utility model.

[0024] Figure 3 This is a schematic diagram of the composition of the isolation cavity of this utility model.

[0025] Figure 4 This is a schematic diagram of the connector structure of this utility model.

[0026] Figure 5 This is an exploded view of the antenna unit structure of this utility model.

[0027] Figure 6 This is a full view of the antenna unit structure of this utility model.

[0028] Figure 7 This is a side view of the antenna unit structure of this utility model.

[0029] Figure 8 This is a top view of the antenna unit structure of this utility model.

[0030] Figure 9 This is a schematic diagram of the present invention located on the top of a microwave oven.

[0031] Figure 10 This is a return loss curve of the dual-source antenna used for microwave oven heating according to this invention.

[0032] Figure 11 This is an isolation curve of the dual-source antenna used for microwave oven heating according to this invention.

[0033] Among them, 1-radiating main body, 11-planar metal sheet, 12-short-circuit metal sheet, 13-feed column;

[0034] 2-Isolation cavity, 21-Grounding plane, 22-Bowl-shaped isolation cavity;

[0035] 3-Connector, 31-Coaxial metal post;

[0036] 4- Microwave oven;

[0037] 5-Water. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] This invention provides a dual-source antenna for microwave oven heating, comprising two antenna units mounted on the microwave oven, such as... Figures 5-8 As shown, each antenna element includes a radiating body 1 for radiation, an isolation cavity 2 to block the coupling path between antenna elements, and a connector 3. The radiating body 1 is disposed within the isolation cavity 2, and the microwave signal is fed in from the connector 3 and transmitted to the radiating body 1. Both the radiating body 1 and the isolation cavity 2 are all-metal low-profile structures. The metal structures of the radiating body 1 and the isolation cavity 2 are heat-resistant to ≥300℃, and their surface corrosion resistance meets the ISO 9227 standard; they can be aluminum alloy structures.

[0040] like Figure 1 , Figure 2 As shown, the radiating body 1 includes a planar metal sheet 11, a short-circuit metal sheet 12, and a feed post 13. The planar metal sheet 11 is parallel to the ground plane 21, and the planar metal sheet 11 and the ground plane 21 are connected by the short-circuit metal sheet 12. The feed post 13 is vertically disposed on the surface of the planar metal sheet 11 and is connected to the microwave feed port of the connector 3 through a through hole in the center of the ground plane 21. The angle between the inner side of the short-circuit metal sheet 12 and the surface on the planar metal sheet 11 where the feed post 13 is located is obtuse. The short-circuit metal sheet 12 is provided with a connection hole for connecting to the ground plane 12 by screws. The position of the connection hole avoids the connection position between the connector 3 and the ground plane 12.

[0041] like Figure 3 As shown, the isolation cavity 2 includes a grounding plane 21 and a bowl-shaped isolation cavity 22. The upper end of the bowl-shaped isolation cavity 22 has an outwardly extending edge, and the lower end has an inwardly extending connecting flange. The grounding plane 21 and the connecting flange are fixedly connected by screws. The center of the grounding plane 21 has a through hole, which is a standardized circular groove and conforms to the electrical protocol standard impedance of 50Ω±5%. The height of the bowl-shaped isolation cavity 22 is less than one-tenth of a microwave wavelength, and the height of the bowl-shaped isolation cavity 22 is greater than the height of the radiating body 1.

[0042] like Figure 4 , Figure 5 As shown, the feed post 13 is threadedly connected to the coaxial metal post 31 of the connector 3 through the through hole in the center of the ground plane 21, thereby enabling the entire antenna to work. Microwave signals in the 2.45GHz or 5.8GHz band are fed in from the connector 3, which has a signal transmission function, and then transmitted by the feed post 13 to the planar metal plate 11. The planar metal plate 11 then radiates electromagnetic wave signals into the microwave oven 4.

[0043] Two antenna units are mounted on the top of the microwave oven 4. The radiating bodies 1 of the two antenna units are placed in the same direction, and the planar metal plate 11 of the radiating body 1 extends towards the door of the microwave oven 4.

[0044] As an improvement, the upper edge of the bowl-shaped isolation cavity 22 is integrated with the top of the microwave oven 4 in a coplanar manner.

[0045] In another embodiment, one antenna unit may be mounted on the top of the microwave oven 4, and the other antenna unit may be mounted on the side of the microwave oven 4. Alternatively, both antenna units may be mounted on the side of the microwave oven 4, including the same side or different sides.

[0046] The straight-line distance between the two antenna elements shall be no less than 1 / 2 wavelength and no more than 1.6 times the wavelength. It should be noted that the straight-line distance here includes the case where the two antenna elements are located on the same panel of the microwave oven 4 (both on the top surface or both on the side surface) or on different panels (one on the top surface and the other on the side surface or on both sides). If the two antenna elements are located on different panels, it refers to the length of the straight-line segment connecting the two antenna elements.

[0047] like Figure 9 As shown, in this embodiment, two antenna units are installed on the top of the microwave oven 4, with a spacing of 190mm between them, and the overall height of the isolation cavity 2 is less than 13mm. 1000ml of water 5 is placed inside the microwave oven 4 for electromagnetic simulation.

[0048] Compared with existing technologies, the low-profile all-metal radiator 1 of this invention provides high-efficiency heating performance for the microwave oven 4. The all-metal isolation cavity 2 improves the isolation of the dual-source antenna. After microwaves are fed in from the connector 3, they are transmitted to the radiating body 1. The two sources work together, and the isolation cavity 2 blocks the coupling path between the two radiating bodies 1. Figure 10 , Figure 11 As shown, the dual-source antenna exhibits return losses S11 and S22 ≤ -10dB and isolation S21 ≤ -15dB within the microwave oven 4. This demonstrates that the dual-source antenna of this invention displays excellent impedance matching, low mutual coupling, and uniform field distribution characteristics in the 2.45GHz frequency band, solving the application requirement of uneven heating in microwave ovens. Simultaneously, the all-metal structure of the radiating body 1 and the isolation cavity 2 located inside the microwave oven enhances the antenna's high-temperature resistance and corrosion resistance.

[0049] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A dual source antenna for microwave oven heating, characterized by, The application relates to a microwave oven antenna unit, which comprises two antenna units arranged on a microwave oven, the antenna units comprising a radiation body for radiation, an isolation cavity for blocking the coupling path between the antenna units and a connector; The radiation body is arranged in the isolation cavity, and microwave signals are fed from the connector and transmitted to the radiation body; the radiation body and the isolation cavity are both full-metal low-profile structures.

2. The dual source antenna for microwave oven heating as claimed in claim 1, wherein, The isolation cavity comprises a ground plane and a bowl-shaped isolation cavity, the bowl-shaped isolation cavity being provided with an outwardly-extending edge at the upper end and an inwardly-extending connecting flange at the lower end; the ground plane is fixedly connected with the connecting flange, and a through hole is arranged in the center of the ground plane; the height of the bowl-shaped isolation cavity is less than one-tenth of a microwave wavelength, and the height of the bowl-shaped isolation cavity is greater than the height of the radiation body.

3. The dual source antenna for microwave oven heating as claimed in claim 2, wherein, The radiation body comprises a planar metal sheet, a short-circuit metal sheet and a feeding column; The planar metal sheet is parallel to the ground plane, and the planar metal sheet and the ground plane are connected by the short-circuit metal sheet; the feeding column is vertically arranged on the surface of the planar metal sheet and is connected with the microwave feeding port of the connector through the through hole in the center of the ground plane; and the included angle between the inner side of the short-circuit metal sheet and the plane where the feeding column is arranged on the planar metal sheet is obtuse.

4. The dual source antenna for microwave oven heating as claimed in claim 3, wherein The two antenna units are arranged on the top of the microwave oven.

5. The dual source antenna for microwave oven heating as claimed in claim 4, wherein The radiation bodies of the two antenna units are placed in the same direction, and the extension direction of the planar metal sheet of the radiation body points to the door of the microwave oven.

6. The dual source antenna for microwave oven heating as claimed in claim 4, wherein The edge of the upper end of the bowl-shaped isolation cavity is coplanar with the top of the microwave oven and is integrated.

7. The dual source antenna for microwave oven heating as recited in claim 4, wherein, The linear distance between the two antenna units is not less than 1 / 2 wavelength and not greater than 1.6 times the wavelength.

8. The dual source antenna for microwave oven heating according to any one of claims 1 to 7, wherein The radiation body and the isolation cavity are both made of aluminum alloy.

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