KR102141136B1 - High frequency band heating loop antenna and oven using the same - Google Patents

Abstract

An embodiment of the present invention relates to a high frequency band heating loop antenna and an oven using the same. The embodiment of the present invention discloses the high frequency band heating loop antenna, which includes: a first antenna installed on an inner surface of a cooking chamber; and a second antenna installed on the inner surface of the cooking chamber to be spaced apart from the first antenna, wherein each of the first and second antennas includes: a plate-shaped stub which is spaced apart from the inner surface of the cooking chamber and installed in parallel to have a length and width; a cylinder-shaped power feeding unit installed on one side of the stub; and a cylindrical grounding unit installed on the other side of the stub. According to the present invention, it is possible to reduce damage and performance changes due to internal high heat.

Description

High frequency band heating loop antenna and oven using the same}

An embodiment of the present invention relates to a loop antenna for high-frequency band heating and an oven using the same.

Referring to FIG. 1, a microwave oven 10 ′, such as a conventional microwave oven, converts AC (eg, 110 V to 220 V AC) into direct current and boosts the boost circuit 11 ′ and boosts the circuit 11 ′. ) Is supplied with power from the magnetron (12') for generating a microwave (for example, a frequency of 2.45 GHz), and guides the microwave generated from the magnetron (12') to radiate inside the cooking chamber (13') It consists of a wave guide 14', a controller 15' for controlling the boost circuit 11', and the like.

As described above, the conventional microwave oven is used to heat or thaw food using a magnetron generating RF power at a frequency of 2.45 GHz, and thus has a problem of being bulky, heavy, as well as complicated to install and poor mechanical reliability.

The above-described information disclosed in the technology that is the background of the present invention is only to improve the understanding of the background of the present invention, and thus may include information that does not constitute the prior art.

The problem to be solved according to an embodiment of the present invention is to provide a loop antenna for high-frequency band heating and an oven using the same. As an example, the problem to be solved according to an embodiment of the present invention is to provide a plurality of antennas having the same operating frequency, to increase the isolation between the plurality of antennas, to cover the entire band inside the cooking chamber (resonator), It is to provide a loop antenna for high-frequency band heating and an oven using the same, which has a ground pin and a connector that has a return loss of a certain level or less, and can reduce damage and performance changes to high heat inside.

A loop antenna for high-frequency band heating according to an embodiment of the present invention includes a first antenna installed on an inner surface of a cooking chamber; And a second antenna spaced apart from the first antenna on the inner surface of the cooking chamber, wherein the first and second antennas are installed in parallel spaced apart from the inner surface of the cooking chamber, and have a plate shape having a length and width. Stub; A column-shaped feeding part installed on one side of the stub; And a ground portion having a cylindrical shape installed on the other side of the stub.

The stub includes a first stub in the form of a rectangular plate having a length and a width; And a second stub extending in a width direction from one side of the first stub and having a length and width.

The feeding part may be installed at an end of the first stub, and the ground part may be installed at the center of the second stub.

The diameter of the ground portion may be larger than the diameter of the feed portion.

The length of the stub may be longer than each length of the power feeding part and the ground part.

The combined length of the power supply unit, the ground unit, and the stub may be equal to the length of the wavelength or half wavelength of the resonance frequency.

An N-type connector coupled to the power supply unit may be further included.

An oven having a loop antenna for high-frequency band heating according to an embodiment of the present invention includes a power supply unit that supplies DC power; A control unit receiving power from the power supply unit and outputting a frequency control signal and an amplification control signal, respectively; A signal generating unit receiving the frequency control signal of the control unit and outputting an RF electromagnetic wave signal in a high frequency band; A first power amplifying unit for receiving the RF electromagnetic wave signal from the signal generator and the amplification control signal from the control unit and amplifying the RF electromagnetic wave and outputting the RF electromagnetic wave to the first antenna according to claim 1; And a second power amplifying unit that receives the RF electromagnetic wave signal from the signal generator and the amplification control signal from the controller, and amplifies the RF electromagnetic wave and outputs the RF electromagnetic wave to the second antenna according to claim 1.

The control unit may control the signal generation unit so that the first and second antennas sweep all frequency bands of 2.4 GHz to 2.48 GHz at predetermined time intervals.

The return loss of the first and second antennas may be less than -5 [dB].

The present invention can provide a loop antenna for high-frequency band heating and an oven using the same. For example, embodiments of the present invention can provide a plurality of antennas having the same operating frequency, can increase the isolation between the plurality of antennas, can cover the entire band inside the cooking chamber (resonator), a certain level It is possible to provide a loop antenna for high-frequency band heating and an oven using the same, having a ground pin and a connector having the following return loss and reducing damage and performance change due to high heat therein.

In addition, the loop antenna for high-frequency band heating according to an embodiment of the present invention can be applied to various composite ovens and thawing devices, and is applied to ovens and thawing devices using solid-state semiconductors, so that it is easy and robust to install compared to existing magnetrons Reliability can be improved. In addition, according to an embodiment of the present invention, by sweeping the entire frequency of the antenna having a return loss of a certain level or less, uniform cooking can be performed.

1 is a block diagram showing the configuration of a conventional microwave oven type.
2 is a block diagram showing an electrical configuration of an oven using a loop antenna for high-frequency band heating according to an embodiment of the present invention.
3A to 3C are views illustrating an example of installation in the oven of a loop antenna for high-frequency band heating according to an embodiment of the present invention.
4 is a perspective view showing a loop antenna for high-frequency band heating according to an embodiment of the present invention.
5 is a graph showing the resonance frequency characteristics of a loop antenna for high-frequency band heating according to an embodiment of the present invention.
6 is a computer simulation diagram showing resonance frequency characteristics of a loop antenna for high-frequency band heating according to an embodiment of the present invention.
7 is a perspective view showing an example of an oven installed in a refrigerator according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are provided to more fully describe the present invention to those of ordinary skill in the art, and the following examples may be modified in various other forms, and the scope of the present invention is as follows. It is not limited to the Examples. Rather, these examples are provided to make the present disclosure more faithful and complete, and to fully convey the spirit of the present invention to those skilled in the art.

In addition, in the following drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description, and the same reference numerals in the drawings refer to the same elements. As used herein, the term “and/or” includes any and all combinations of one or more of the listed items. In addition, in this specification, "connected" means not only when the A member and the B member are directly connected, but also when the C member is interposed between the A member and the B member to indirectly connect the A member and the B member. do.

The terminology used herein is used to describe a specific embodiment and is not intended to limit the present invention. As used herein, singular forms may include plural forms unless the context clearly indicates otherwise. Also, when used herein, "comprise, include" and/or "comprising, including" refer to the shapes, numbers, steps, actions, elements, elements and/or groups of these mentioned. It is to specify existence and not to exclude the presence or addition of one or more other shapes, numbers, actions, elements, elements and/or groups.

Although the terms first, second, etc. are used herein to describe various members, parts, regions, layers and/or parts, these members, parts, regions, layers and/or parts are defined by these terms. It is obvious that not. These terms are only used to distinguish one member, part, region, layer or portion from another region, layer or portion. Accordingly, the first member, component, region, layer, or part described below may refer to the second member, component, region, layer, or part without departing from the teachings of the present invention.

Space-related terms such as "beneath", "below", "lower", "above", and "upper" are associated with one element or feature shown in the drawing. It can be used for easy understanding of other elements or features. Terms related to these spaces are for easy understanding of the present invention according to various process states or use states of the present invention, and are not intended to limit the present invention. For example, if an element or feature in a drawing is flipped over, the element or feature described as "bottom" or "below" becomes "top" or "above". Thus, "below" is a concept encompassing "top" or "bottom".

In addition, the control unit (controller) and/or other related devices or components according to the present invention may be implemented using any suitable hardware, firmware (eg, on-demand semiconductors), software, or any suitable combination of software, firmware and hardware. Can. For example, various components of a control unit (controller) and/or other related devices or components according to the present invention may be formed on one integrated circuit chip or on separate integrated circuit chips. Further, various components of the control unit (controller) may be implemented on a flexible printed circuit film, and may be formed on a tape carrier package, a printed circuit board, or the same substrate as the control unit (controller). Further, various components of the control unit (controller) may be, in one or more computing devices, processes or threads running in one or more processors, which execute computer program instructions to perform various functions mentioned below. And interact with other components. Computer program instructions are stored in memory that can be executed in a computing device using standard memory devices, such as, for example, random access memory. Computer program instructions may also be stored on other non-transitory computer readable media, such as, for example, CD-ROMs, flash drives, and the like. In addition, those skilled in the art of the present invention may combine various computing device functions with each other, integrate them into one computing device, or have specific computing device functions without departing from exemplary embodiments of the present invention. It should be recognized that it can be distributed across fields.

2 is a block diagram showing an electrical configuration of an oven using a loop antenna for high-frequency band heating according to an embodiment of the present invention.

As shown in FIG. 2, the oven 100 using a high-frequency band heating loop antenna according to an embodiment of the present invention includes a power supply unit 110, a control unit 120, a signal generation unit 121, and The first and second phase shifters 130A and 130B (optional), the first and second power amplifying units 140A and 140B, and the first and second antennas 150A and 150B may be included. Here, although two antennas 150A and 150B are described, the number of antennas in the embodiment of the present invention is not limited. For example, 2 to 100 antennas may be installed, and accordingly, the number of installations of the phase shifter and the power amplification unit may be further increased than shown. In addition, between the signal generator 121 and the first and second phase shifters 130A and 130B, the signal attenuators 123A and 123B and the drivers 125A and 125B may be further connected in series. Signal attenuators 126A and 126B may be further connected between the two-phase shifters 130A and 130B and the first and second power amplifiers 140A and 140B, respectively. In addition, although one signal generation unit 121 is shown in the drawing, a signal generation unit may be provided for each antenna so that each antenna radiates different frequencies.

The power supply unit 110 serves to supply DC power to the control unit 120 and the first and second power amplification units 140A and 140B. The power supply unit 110 may be, for example, but not limited to, a Switching Mode Power Supply (SMPS). In addition, the power supply unit 110 may obtain a desired DC voltage/current by using a normal commercial AC voltage (eg, AC 110 to 220 V) or by using a normal DC battery pack. Therefore, the oven 100 according to the embodiment of the present invention is installed in an outdoor, a vehicle, a refrigerator having a freezer or a freezer, as well as in an ordinary home so that it can be easily installed and used.

The control unit 120 (or MCU) receives power from the power supply unit 110 and transmits a frequency control signal, a phase control signal, and/or an amplification (power) control signal to the signal generator 121, the first and second phase shifters ( 130A, 130B) and the first and second power amplifiers 140A and 140B, respectively. That is, the control unit 120 outputs a frequency control signal to the signal generation unit 121, so that the signal generation unit 121 generates, for example, but not limited to, electromagnetic waves having frequencies from 2.4 GHz to 2.48 GHz. Do it. In particular, the controller 120 causes the signal generator 121 to sweep the entire frequency band of 2.4 GHz to 2.48 GHz at regular intervals through a frequency control signal. In some cases, a plurality of signal generators 121 are also provided and connected to the attenuators 123A and 123B, so that electromagnetic waves of different frequencies as well as the same frequency can be input to the drivers 125A and 125B, respectively.

In addition, the controller 120 outputs the same or different phase control signals to the first and second phase shifters 130A and 130B, respectively, so that the first and second phase shifters 130A and 130B are limited, for example. However, electromagnetic waves in a frequency band having a phase value or a phase difference of 0 to 180 degrees are output. Moreover, the control unit 120 outputs the same or different amplification control signals to the first and second power amplifying units 140A and 140B, so that the first and second power amplifying units 140, for example, are limited. However, electromagnetic waves having a power value or a power difference of 0 to 3000 watts are output.

The signal generating unit 121 receives the frequency control signal of the control unit 120 and outputs an electromagnetic wave signal in a certain frequency band. The signal generator 121 generates an electromagnetic wave signal using a predetermined algorithm or software using a semiconductor PLL IC rather than an oscillating circuit. Accordingly, the signal generator 121 may generate a sophisticated electromagnetic wave signal in a digital manner, not an analog method. Here, the signal generator 121 may generate electromagnetic waves having a frequency of 2.4 GHz to 2.48 GHz, for example, but not limited to.

The first and second phase shifters 130A and 130B respectively receive an electromagnetic wave signal from the signal generating unit 121 and a phase control signal from the control unit 120, and the phase value or phase difference is, for example, limited. However, the electromagnetic wave signals of 0° to 180° are output to the first and second power amplifying units 140A and 140B, respectively.

The first and second power amplification units 140A and 140B are electromagnetic wave signals from the first and second phase shifters 130A and 130B (which may or may not have a phase difference between each other) and the first and second from the control unit 120. Each amplification (power) control signal is input and amplified electromagnetic waves are output at a predetermined magnification. The first and second power amplifying units 140A and 140B may output electromagnetic wave power having various power values or power differences of 0 to 3000 watts, for example, as a solid state power amplifier.

More specifically, the first and second power amplification units 140A and 140B are electrically connected to the first and second phase shifters 130A and 130B, respectively, to receive an electromagnetic wave signal, and a MMIC (Monolithic Microwave Integrated Circuit) 141A, 141B) and MMICs 141A and 141B, respectively, which are electrically connected to driving transistors 142A and 142B that perform amplification operations, and termination transistors that are electrically connected to driving transistors 142A and 142B, respectively, to perform termination output. (143A, 143B). Moreover, the first and second power amplification units 140A and 140B may further include first and second isolators 144A and 144B formed between the first and second coaxial cables 145A and 145B, respectively. The first and second isolators 144A and 144B are interposed between the first and second power amplification units 140A and 140B and the first and second coaxial cables 145A and 145B, so that impedance matching is enhanced and power transmission is smoother. In particular, the first and second antennas 150A and 150B act as a first and second power amplifying unit 140A and 140B, respectively.

Meanwhile, a protection circuit (not shown) is further connected between the first and second isolators 144A and 144B and the control unit 120 so that the control unit 120 can be input through the first and second isolators 144A and 144B. Do not be damaged by transient voltage.

The first and second antennas 150A and 150B are connected to the first and second power amplification units 140A and 140B by first and second coaxial cables 145A and 145B and N-type connectors, respectively. By receiving the amplified electromagnetic waves from the amplification units 140A and 140B, respectively, and radiating electromagnetic waves of the same, controlled phase, or different phases or different powers to the cooking object in the cooking chamber 160, the cooking object Allow it to heat, thaw or dry uniformly.

As will be described again below, the first and second antennas 150A and 150B are installed in a substantially flat shape at different positions on the inner surface of the cooking chamber 160, thereby preparing various types of cooking located inside the cooking chamber 160. Allow the subject to heat, thaw and/or dry uniformly.

The first and second antennas 150A and 150B operate in a predetermined frequency band within the cooking chamber 160 as described above, and miniaturize the size to minimize the space occupied in the cooking chamber 160. All the antennas used when placing two or more antennas in the oven for uniform heating in the cooking chamber 160 may use the same or different shapes, and examples of installation positions and shapes of the used antennas are as follows. Is explained.

In this way, in the embodiment of the present invention, a plurality of hot spots are generated in the cooking chamber 160 using two, four, or more multi-antennas 150A and 150B, thereby enabling uniform heating of the cooking object. Do it. In addition, in the embodiment of the present invention, by controlling the wavelength or beam forming of the electromagnetic wave in a manner of sweeping the entire frequency band of 2.4GHz to 2.48GHz along with multiple antennas 150A and 150B at regular time intervals, It is possible to uniformly heat the cooking object. In addition, in the embodiment of the present invention, by varying the power (output) for each antenna as needed, the power can be optimized and the current consumption can be drastically reduced.

3A to 3C are views illustrating an example of installation in the oven of a loop antenna for high-frequency band heating according to an embodiment of the present invention.

3A to 3C, first and second antennas 150A and 150B according to an exemplary embodiment of the present invention may be installed on an upper surface of the inner surface of the cooking chamber 160. In some examples, the first antenna 150A is installed on the upper surface of the cooking chamber 160, and the second antenna 150B is spaced apart from the first antenna 150A on the upper surface of the cooking chamber 160. .

In some examples, the first and second antennas 150A and 150B may be installed on one side, the other side, or the back side of the cooking chamber 160. In addition, the first antenna 150A may be installed on the upper surface of the cooking chamber 160, and the second antenna 150B may be installed on one side, the other side, and/or the rear side of the cooking chamber 160.

In some examples, the first and second antennas 150A and 150B may be installed spaced a predetermined distance from the inner surface (conductor surface or oven surface). Moreover, the first and second antennas 150A and 150B may have the same size and shape.

4 is a perspective view showing a loop antenna for high-frequency band heating according to an embodiment of the present invention.

As illustrated in FIG. 4, the first and second antennas 150A and 150B may include stubs 151 (ie, radiators), a power supply unit 154, and a ground unit 155, respectively.

The stub 151 is spaced apart from the inner surface of the cooking chamber 160 and is installed substantially in parallel, and may be in the form of a thin plate having a length and width. More specifically, the stub 151 may include a first stub 152 and a second stub 153. The first stub 152 has a substantially rectangular thin plate shape having a length and a width, and the second The stub 153 extends in the width direction from one side of the first stub 152 and may have a substantially rectangular thin plate shape having a length and a width. In one example, the stub 151 may have an approximately “L” shape or an approximately “a” shape as a whole. Accordingly, the polarization generated from the stub 151 is also formed in an approximately “L” shape or an approximately “a” shape, so that an electric field is formed in a more various shape inside the cooking chamber 160, and accordingly, the cooking time This can be further shortened. Moreover, when the stub 151 is formed in an approximately “L” shape or an approximately “a” shape, impedance matching of the antenna becomes easier, and the design of the microwave oven becomes easy. In addition, although the present invention proposes the stub 151 in an approximately “L” shape or an approximately “a” shape, various bending shapes may be possible in addition to this bending shape.

The power feeding unit 154 is installed at one side of the stub 151, for example, in a substantially vertical direction at an end of the first stub 152, and may have a substantially cylindrical shape. The N-type connector 156 is installed at an end of the power feeding unit 154, so that the power may be supplied to the power feeding unit 154 through the N-type connector 156. Of course, the N-type connector 156 can be connected to a coaxial cable. Here, the diameter and resistance of the power supply unit 154 are formed to be the same as the diameter and resistance (50 Ω) of the commercial N-type connector 156, whereby impedance matching can be improved.

The ground portion 155 is installed at the other side of the stub 151, for example, in a substantially vertical direction at the center of the second stub 153, and may have a substantially cylindrical shape. Here, the length and diameter of the ground portion 155 may be determined according to the width (or length) of the stub 151, and may be formed to a size sufficient to support the antenna. Here, the diameter of the ground portion 155 may be formed to be larger than the diameter of the power supply portion 154. When the diameter of the ground portion 155 is changed, the impedance is changed to require an electrical length of the antenna or an additional stub matching structure. Can.

Meanwhile, the power feeding unit 154 and the grounding unit 155 may be installed at both ends of the stub 151 having a “L” shape or a “A” shape, respectively. Therefore, an area (opening portion) without the stub 151 may exist on an imaginary straight line connecting the power supply unit 154 and the ground unit 155. Here, the bending spaces of the first stub 152 and the second stub 153 may be defined as openings.

In some examples, the stub 151, the feeding portion 154 and the ground portion 155 may include copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, iron, iron alloy, SUS.

In some examples, the diameter of the grounding portion 155 may be larger than the diameter of the power feeding portion 154. As described above, when the diameter of the ground portion 155 is relatively large (conversely, the diameter of the power feeding portion 154 is relatively small), electromagnetic wave radiation characteristics (resonance characteristics and reflection loss characteristics, etc.) can be improved.

In some examples, the length X of the stub 151 (the vector distance from the feeder to the ground) may be longer than each length Y of the feeder 154 and the ground 155. Here, the length of the stub 151 may be a length of an imaginary straight line connecting the power supply unit 154 and the ground unit 155 in a straight line.

For example, each length Y of the power feeding unit 154 and the grounding unit 155 may be approximately 34 mm, and the length X of the stub 151 may be approximately 54 mm. As another example, each length Y of the power supply unit 154 and the ground unit 155 may be approximately 19 mm, and the length X of the stub 151 may be approximately 40 mm.

Substantially, the combined length of the power supply unit 154, the ground unit 155, and the stub 151 may be equal to a wavelength of a resonance frequency or equal to a half wavelength.

In this way, the antenna according to the embodiment of the present invention may provide, for example, an approximately 1λ 0 loop antenna (total resonance length = 122 mm). Here, 11λ0 @ 2.4GHz = 125 mm in the air, and 1/21λ0 @ 2.4GHz = 63 mm.

In addition, in this way, the antenna according to the embodiment of the present invention may provide, for example, an approximately 1/2λ 0 loop antenna (total resonance length = 76 mm). Similarly, 11λ0 @ 2.4GHz = 125 mm in air, and 1/21λ0 @ 2.4GHz = 63 mm.

In this way, the first and second antennas 150A and 150B according to the embodiment of the present invention have the same operating frequency, excellent isolation between antennas, and cover all bands inside the cooking chamber or the resonance chamber 160. It has a return loss below a certain level. Moreover, the power supply unit 154 and the ground unit 155 may be configured to reduce damage and performance changes due to high heat inside.

5 is a graph showing the resonance frequency characteristics of a loop antenna for high-frequency band heating according to an embodiment of the present invention. Here, the X-axis is the emission frequency, and the Y-axis is the S-parameter (dB).

As shown in FIG. 5, in the case of the 2.4GHz band, the first and second antennas disclosed in the present invention generate a plurality of resonance modes in a shielded oven (chamber or resonator) (for example, 2.405GHz, 2.415GHz, 2.432GHz, 2.453GHz). Accordingly, it can be seen that the frequency transmitted to the dielectric (food) and the frequency generated by the resonator itself are mixed. In addition, it can be seen that the first and second antennas have a low return loss of approximately -5 [dB] or less, and furthermore, the isolation between the first and second antennas is excellent.

6 is a computer simulation diagram showing resonance frequency characteristics of a loop antenna for high-frequency band heating according to an embodiment of the present invention.

6, it can be seen that the first and second antennas of the present invention have different distributions of electric fields distributed by frequency. In addition, in the case of the 2.4 GHz band frequency, it can be seen that a number of resonance modes occur within the resonator. However, it is not possible to select a specific frequency transmitted to the dielectric, such as the 915MHz or 433MHz band. However, by sweeping the entire frequency band of 2.4 GHz to 2.48 GHz at regular intervals, even electric fields are distributed in the dielectric (food) and uniform heat transfer is possible.

The antenna according to the embodiment of the present invention is easy to assemble to the inner surface of the oven by using a pin structure (using screws, etc.) and can easily apply the grounding role of the antenna. In addition, in the embodiment of the present invention, spots are generated at a length of 1λ of 2.45 GHz, so that heat transfer of the dielectric (food) may not be evenly performed. Therefore, it can be physically and electrically stirred using an existing turntable or stirrer structure.

On the other hand, the embodiment of the present invention is a dual antenna operating at the same frequency, it is possible to maintain high isolation between antennas. In addition, by sweeping the entire frequency of the antenna having a return loss of a certain level or less, a uniform electric field can be constructed in consideration of characteristics of electric fields distributed differently for each frequency, and heat can be evenly transmitted to the dielectric (food) at the same time. In addition, an embodiment of the present invention provides a dual antenna having the same electrical length and operating at the same frequency. Of course, the resonance frequencies of the first and second antennas may be the same.

In other words, an embodiment of the present invention provides an antenna operating at the same frequency and showing a return loss below a certain level. In addition, in the embodiment of the present invention, the direction of the electric field may be variously applied according to the shape of the end of the pattern of the antenna, and various resonance modes may be generated according to the shape of the pattern (0 degrees, 90 degrees) regardless of reflection loss. . In addition, in the embodiment of the present invention, the diversity of the electric field according to the shape of the pattern can be variously applied according to the shape of the resonator and the purpose of the oven by configuring various types of resonant modes by generating various resonant modes in the resonator. In addition, the embodiment of the present invention can improve the durability and reliability by removing the insulator of the feeder. Moreover, in the embodiment of the present invention, in the case of a connector structure with an insulator removed, it can be used for RF energy such as a plasma lighting system that generates high heat. Further, an embodiment of the present invention can eliminate the use of a lump element for impedance matching of the antenna and implement matching through a stub structure. In addition, an embodiment of the present invention can easily implement impedance in a resonator using stub matching, which serves as L (inductance) and C (capacitance).

7 is a perspective view showing an example of an oven having a loop antenna for high-frequency band heating installed in a refrigerator according to an embodiment of the present invention.

As shown in FIG. 7, an oven 100 having a loop antenna for high-frequency band heating according to an embodiment of the present invention may be installed in the refrigerator 200. The refrigerator 200 may include, for example, but is not limited to, a freezer compartment and a freezer compartment door 210 for preventing the freezer compartment, and a refrigerator compartment door 220 for preventing the freezer compartment, and a high-frequency band heating according to an embodiment of the present invention. Oven 100 having a loop antenna for the can be installed in the freezer door 210. Of course, it is natural that the oven 100 having a loop antenna for high-frequency band heating according to an embodiment of the present invention may be installed inside the refrigerator compartment door 220, the freezer compartment, and/or the refrigerator compartment. In addition, since the oven 100 having a loop antenna for high-frequency band heating according to an embodiment of the present invention does not have a magnetron and a waveguide, it can be formed and installed much smaller or thinner than shown in the drawing. Do. In the drawings, reference numeral 230 is a home bar.

What has been described above is only one embodiment for implementing a high-frequency band heating loop antenna according to the present invention and an oven using the same, and the present invention is not limited to the above-described embodiment, and is claimed in the following claims. As described above, without departing from the gist of the present invention, anyone who has ordinary knowledge in the field to which the present invention belongs will have the technical spirit of the present invention to the extent that various changes can be implemented.

100; Oven with loop antenna for high frequency band heating
110; Power supply 120; Control
121; Signal generators 130A, 103B; 1st and 2nd phase shifter
140A, 140B; First and second power amplifiers 150A and 150B; 1st and 2nd antenna
150A,150B; 1st and 2nd antenna
151; Stub 152; 1st stub
153; Second stub 154; Feeder
155; Ground 156; N type connector
160; Cooking cavity

Claims (10)

A first antenna installed on the inner surface of the cooking chamber; And
And a second antenna spaced apart from the first antenna on the inner surface of the cooking chamber,
The first and second antennas are spaced apart from the inner surface of the cooking chamber, respectively, and are installed in parallel and have a plate-shaped stub having a length and width; A column-shaped feeding part installed on one side of the stub; And a cylindrical grounding portion installed on the other side of the stub, wherein the diameter of the grounding portion is larger than the diameter of the feeding portion, and the loop antenna for high-frequency band heating. According to claim 1,
The stub includes a first stub in the form of a rectangular plate having a length and a width; And
A loop antenna for heating at a high frequency band, comprising a second stub in the form of a square plate extending in a width direction from one side of the first stub. According to claim 2,
The feeding portion is installed at the end of the first stub, the ground portion is installed in the center of the second stub, a high-frequency band heating loop antenna. delete According to claim 1,
A loop antenna for heating a high frequency band, wherein the length of the stub is longer than each length of the power supply part and the ground part. According to claim 1,
A loop antenna for high-frequency band heating, wherein the combined length of the power supply unit, the ground unit, and the stub is equal to a wavelength of a resonance frequency or a half wavelength. According to claim 1,
A loop antenna for high-frequency band heating, further comprising an N-type connector coupled to the feeder. A power supply unit that supplies DC power;
A control unit receiving power from the power supply unit and outputting a frequency control signal and an amplification control signal, respectively;
A signal generating unit receiving the frequency control signal of the control unit and outputting an RF electromagnetic wave signal in a high frequency band;
A first power amplifying unit receiving the RF electromagnetic wave signal from the signal generating unit and the amplification control signal from the control unit and amplifying the RF electromagnetic wave and outputting the RF electromagnetic wave to the first antenna according to claim 1; And
A high-frequency band heating loop comprising a second power amplifying unit that receives the RF electromagnetic wave signal from the signal generator and the amplification control signal from the controller, and amplifies the RF electromagnetic wave and outputs it to the second antenna according to claim 1. Oven with antenna. The method of claim 8,
The control unit controls the signal generation unit so that the first and second antennas sweep all frequency bands of 2.4 GHz to 2.48 GHz at predetermined time intervals, an oven having a loop antenna for high frequency band heating. The method of claim 8,
The first and second antenna return loss is less than -5 [dB], an oven having a loop antenna for high-frequency band heating.

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