KR20110026807A - A cooking apparatus using microwave - Google Patents

Abstract

PURPOSE: A cooker using microwave is provided to produce high power microwave without a separate frequency oscillator using a microwave generating unit with an amplifier. CONSTITUTION: A cooker using microwave comprises an amplifier(530), a microwave generating unit(510), and a feeder. The amplifier performs frequency oscillation and amplification. The microwave generating unit produces and outputs microwave. The microwave generating unit comprises a phase shifter(540), a circulator(550), and a controller. The phase shifter transits the phase of the outputted microwave. The circulator supplies the phase-shifted microwave to the amplifier. The controller supplies phase transition signals to the microwave generating unit. The feeder outputs the outputted microwave to the inside of the cavity.

Description

Cooking apparatus using microwaves {A cooking apparatus using microwave}

The present invention relates to a cooking apparatus using a microwave, and more particularly, to a cooking apparatus using a microwave capable of simply generating a high-power microwave without a separate frequency oscillator.

In general, when a microwave oven uses a microwave oven to store food and seals the food, and then presses an operation button, a voltage is applied to the high pressure generator, and a commercial voltage applied to the high pressure generator is boosted to apply power to the magnetron that generates the microwave. The microwave generated by the magnetron is transmitted to the cavity through a wave guide or the like.

In this case, the cooking apparatus using the microwave is to heat the food with friction heat generated by irradiating the microwaves generated from the magnetron to the food and vibrating the molecules constituting the food 245 million times per second.

Cooking apparatus using such a microwave is a situation that is widely spread in the general home due to various advantages such as easy temperature control, saving of cooking time, ease of operation.

It is an object of the present invention to provide a cooking apparatus using microwaves that can easily generate high power microwaves without a separate frequency oscillator.

Microwave cooking apparatus according to an embodiment of the present invention for solving the above problems, a microwave generator having an amplifier for performing frequency oscillation and amplification, and generates and outputs a microwave, and the output micro It includes a feeder that outputs a wave into the cavity.

In addition, a cooking apparatus using a microwave according to an embodiment of the present invention for solving the above problems, a microwave generation unit for generating and outputting a plurality of microwave, RF switch for separating the transmission path of the microwave and It includes a feeder for outputting the microwave output from the RF switch into the cavity.

According to the present invention, by using the microwave generator having an amplifier for performing the frequency oscillation and amplification, it is possible to simply generate a high power microwave without a separate frequency oscillator.

In addition, by connecting a plurality of amplifiers in series, parallel or series-parallel mixing to the output terminal of the amplifier, it is possible to stably generate high-power microwaves.

On the other hand, by using the RF switch for separating the transmission path of the microwave, and by using a plurality of feeders, it is possible to increase the heating efficiency in the cavity.

In addition, by separating the transmission path of the scan section and the heating section of the entire cooking section using the RF switch, it is possible to efficiently configure the cooking appliance. In particular, it is possible to configure a transmission path according to the scan section of the low power and a transmission path according to the heating section of the high power.

In addition, by calculating the heating efficiency using the microwave output into the cavity and the reflected microwave, it is possible to efficiently heat the object in the cavity according to the heating efficiency.

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

1 is a partial perspective view of a cooking appliance using a microwave according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the cooking appliance of FIG.

Referring to the drawings, the cooking appliance 100 using the microwave according to an embodiment of the present invention, the door 106 is attached to the cooking window 104 in the front portion of the main body 102 is coupled to open and close. The operation panel 108 is coupled to one side of the front surface of the main body 102.

The door 106 opens and closes the cavity 134, and although not shown in the drawing, a filter part (not shown) for shielding the microwave may be provided inside the door 106.

The operation panel 108 includes an operation unit 107 for operating the operation of the cooking appliance, and a display unit 105 for displaying the operation of the cooking appliance, and the like.

The inside of the main body 102 is provided with a cavity 134 having an accommodation space of a predetermined size so that the heating target 140, for example, food is accommodated and cooked by a microwave.

In addition, a microwave generating unit 110 for generating a microwave is installed on the outer surface of the cavity 134, and a microwave generated by the microwave generating unit 110 on the output side of the microwave generating unit 110. The microwave transmission unit 112 for guiding the inside of the cavity 134 is disposed.

The microwave generator 110 may include a solid state power amplifier (SSPA) using a semiconductor. Solid-state power amplifiers (SSPAs) have the advantage of taking up less space than magnetrons.

On the other hand, the solid state power amplifier (SSPA), a hybrid high-frequency integrated circuit (HMIC), or a passive element (passive and passive elements (capacitors and inductors, etc.) and active elements (transistors, etc.) are separately provided for amplification; The active device may be implemented as a single high frequency integrated circuit (MMIC) implemented as a single substrate.

Meanwhile, according to the exemplary embodiment of the present invention, the microwave generator 110 may generate and output a plurality of microwaves. The frequency range of such microwaves may be around 900 MHz to 2500 Hz. In particular, it may be within a predetermined range around 915 MHz or within a predetermined range around 2450 MHz. A detailed description of the microwave generation unit 110 will be described later with reference to FIG. 3.

The microwave transmitter 112 transmits the microwave generated and output by the microwave generator 110 to the cavity 134. The microwave transmitter 112 may include a waveguide or a coaxial line.

On the other hand, the end of the microwave transmission unit 112 may be connected to the feeder (feeder) so that the microwave is discharged to the cavity 134. In the drawings, an opening 145 is illustrated as an example of a feeder, but the present invention is not limited thereto, and an antenna, an amplifier, or the like may be combined. On the other hand, the opening 145 may be formed in various forms such as a slot form. Through this feeder, microwaves are released to the cavity 134.

Meanwhile, although one opening 145 is illustrated above the cavity 134 in the drawing, the opening 145 may be disposed below or on the side of the cavity 134, and a plurality of openings may be disposed. It is also possible. The same applies to the case where the coupling is performed through the antenna instead of the opening 145.

Below the microwave generator 110, a power supply 114 for supplying power to the microwave generator 110 is provided.

The power supply unit 114 may include a high voltage transformer for supplying power to the microwave generator 110 by boosting the power input to the cooking apparatus 100 to a high pressure, or generated by one or more switching elements performing a switching operation. An inverter for supplying a high output voltage of about 3500V or more to the microwave generator 110 may be provided.

Meanwhile, a cooling fan (not shown) for cooling the microwave generator 110 may be installed around the microwave generator 110.

Although not shown in the drawings, a turntable (not shown) for rotating the heating target 140 may be installed in the cavity 134. Also, a cavity for dispersing microwaves may be installed in the cavity 134. A stirr fan (not shown) may be generated, and a cover (not shown) may be installed to prevent damage of the stirrer fan (not shown). Such a stirrer fan (not shown) may be regarded as a kind of antenna described above.

In the cooking apparatus 100 using the microwaves described above, the user opens the door 106, puts the heating object 140 into the cavity 134, and then closes the door 106, and then the operation panel 108. ), In particular, by pressing the cooking selection button (not shown) and the start button (not shown) by operating the operation unit 107, it is operated.

That is, the power supply unit 114 in the cooking apparatus 100 boosts the input AC power to a high-pressure DC power supply to supply the microwave generator 110, and the microwave generator 110 supplies the corresponding microwave. It generates and outputs, the microwave transmitter 112 transmits the generated microwave to be emitted to the cavity 134. Accordingly, the heating target 140, for example, the food inside the cavity 134 is heated. Overall operations of the cooking appliance 100 may be performed by a controller (not shown). Description of the control unit (not shown) will be described with reference to the following drawings.

3 is a block diagram schematically illustrating the inside of the cooking appliance of FIG. 1, and FIG. 4 is a diagram illustrating a change in frequency of a scan section.

Referring to the drawings, the cooking apparatus 100 according to the embodiment of the present invention includes a microwave generator 110. In addition, the cooking apparatus 100 may further include a controller 310 and a microwave transmitter 112. In addition, the cooking apparatus 100 may further include a directional coupler 338 and a power supply 114.

 The microwave generator 110 includes an amplifier (not shown). An amplifier (not shown) performs frequency oscillation and amplification operations. An amplifier (not shown) according to an embodiment of the present invention performs oscillation on its own, and amplifies and outputs the same. In addition, the amplifier (not shown) may perform frequency oscillation and amplification operations to output a plurality of microwaves having different frequencies. Such a plurality of microwaves may be sequentially output.

As described above, the amplifier may be a solid state power amplifier (SSPA) using a semiconductor device, and may be provided in a single high frequency integrated circuit (MMIC) using a single substrate. As a result, the amplifier (not shown) can be easily controlled by the control unit 310, and the size of the amplifier can be reduced to achieve device integration.

An amplifier (not shown) will be described later with reference to FIG. 5 or below.

The directional coupler (DC) 338 transmits the microwaves amplified and output from the microwave generator 110, in particular, an amplifier (not shown), to the microwave transmitter 112. The microwave transmitted from the microwave transmitter 112 and output from the feeder heats the object in the cavity 134. As the feeder, the opening 145 may be exemplified as described above, or an antenna, an amplifier, or the like may be used.

On the other hand, microwaves that are not absorbed by the object and reflected may be input to the directional coupler 338 through the feeder and the microwave transmitter 112 again. The directional coupler 338 transmits the reflected microwaves to the controller 310.

The cooking appliance 100 may further include a DC converter (not shown) disposed between the controller 310 in the directional coupler 338 and converting the reflected microwave into a control signal. The DC converter (not shown) may be implemented as a diode device.

On the other hand, the cooking apparatus 100 is disposed between the microwave generating unit 110 and the directional coupling unit 338, when the microwave amplified by the amplifier (not shown) to the cavity 134, the microwave Passing through, and the microwave reflected from the cavity 134 may further include an isolation (not shown) for blocking. Here, the isolation unit (not shown) may be implemented as an isolator.

On the other hand, the above-described amplifier (not shown), the directional coupler 338, etc. in the microwave generator 110 may be implemented as a module (module). That is, it is possible to be all disposed on one substrate, to be implemented as one module. By the integration of the device, the microwave generator 110 can be easily controlled by the controller 310.

As described below, the microwave generator 110 generating a plurality of microwaves calculates heating efficiency, and varies the heating time according to the efficiency, thereby uniformly heating the object.

The controller 310 controls the overall operation of the cooking appliance. When the operation signal of the cooking appliance is input through the operation unit 107, the controller 310 controls the microwave generator 110 to sequentially output microwaves in a wide frequency range.

To this end, the controller 310 may output a phase control signal to a phase shifter (not shown) in the microwave generator 110. According to the phase control signal, the phase shifter (not shown) varies the phase of the microwave output from the amplifier (not shown) and feeds it back to the amplifier (amplifier), whereby a plurality of microwaves of various frequencies are supplied. To be printed. Operation of the amplifier (not shown) is performed with reference to FIG. 5 below.

In addition, the controller 310 may compare the power of the output microwave with the reference power, and control the power of the output microwave to be constant based on the difference signal. For example, when the microwave generator 110 generates and outputs a plurality of microwaves, the controller 310 compares the plurality of microwave powers and the reference power, respectively, and outputs the signals based on the difference signal. The power of the plurality of microwaves may be controlled to be constant.

In addition, the controller 310 may calculate heating efficiency for each of the plurality of microwaves based on the microwaves reflected from the inside of the cavity among the microwaves output by the microwave generator 110.

Here, Pt represents the power of the microwave emitted into the cavity 134, Pt represents the power of the microwave reflected from the cavity 134, he represents the heating efficiency of the microwave.

According to Equation 1, the heating efficiency he becomes smaller as the power of the microwave to be reflected increases.

Such heating efficiency calculation can be performed during the entire cooking section. In particular, when the entire cooking section includes the scan section and the heating section, the heating efficiency may be calculated in the scan section.

In FIG. 4, a plurality of microwaves whose frequencies increase in sequence in the scan period Ts are emitted into the cavity 134. Accordingly, the heating efficiency calculation may be performed during the scan period Ts.

Meanwhile, the scan section may be performed before the heating section of the entire cooking section, but is not limited thereto and may be performed simultaneously with the heating section. In other words, it is possible to perform simultaneous scanning and heating for each frequency.

On the other hand, the control unit 310, according to the heating efficiency calculated for each frequency, in the heating section, to control the output period for each frequency or the power level for each frequency of the plurality of microwaves emitted into the cavity 134 vary. It is possible. That is, the controller 310 may output a phase control signal to the amplifier (not shown) in the microwave generator 110 to change the output period for each frequency or the power level for each frequency.

For example, when the heating efficiency he calculated at a predetermined frequency is high, the output period of the microwave may be shortened or the output power level may be reduced. In addition, when the heating efficiency he calculated at a predetermined frequency is low, it can be controlled so that the output period of the microwave becomes longer or the output power level becomes larger.

That is, while sequentially sweeping a plurality of microwaves, the output period or output power level of each microwave may be varied according to the calculated heating efficiency.

Accordingly, the microwaves can be uniformly absorbed by the heating target 140 in the cavity 134 for each frequency, and the heating target 140 can be uniformly heated.

On the other hand, the control unit 310, it is also possible to control to output the microwave of the corresponding frequency only when the heating efficiency (he) calculated for each frequency is more than the set value. That is, the microwave having a significantly lower heating efficiency (he) is excluded from the actual heating section, thereby efficiently heating the heating object 140 uniformly.

On the other hand, the amplifier (not shown) and the directional coupler 338 in the microwave generator 110 described above may be implemented as a module. That is, it is possible to be all disposed on one substrate, to be implemented as one module.

In addition, the control unit 310 may control the display unit 105 to display an operation state of the cooking appliance. For example, in the case of the current scan section of the entire cooking section, it may be displayed through the display unit 105, and in the case of the actual heating section, it may be displayed. In addition, various types of display functions may be performed, such as displaying remaining time of the entire cooking section.

The power supply unit 114 boosts the power input to the cooking appliance 100 to a high pressure and outputs the power to the microwave generator 110. The power supply unit 114 may be implemented as a high voltage transformer or an inverter.

5 is a block diagram illustrating an example of an inside of the microwave generation unit of FIG. 3.

Referring to the drawings, the microwave generator 510 of FIG. 5 includes an amplifier 530, a phase shifter 540, and a circulator 550.

The amplifier 530 receives the dc power from the power supply 114 and performs its own frequency oscillation and amplification. That is, without a separate frequency oscillator for generating and outputting a frequency oscillation signal, it performs frequency oscillation by itself according to the input of the dc power supply, and performs an amplification operation.

The amplifier 530 may include at least one RF power transistor, and when a plurality of RF power transistors are used, the amplifier 530 may be implemented in series, parallel, serial, or parallel mixing to implement multistage amplification. The amplifier 530 may be, for example, an RF power transistor. On the other hand, the output of the amplifier 530 may be approximately, 100 to 1000W.

Next, the phase shifter 540 may feed back the output of the amplifier 530 to shift the phase. The amount of phase shift may be adjusted according to the phase control signal of the controller 310. By phase shifting the amplified signal of the predetermined frequency output from the amplifier in this way, it is possible to generate microwaves of various frequencies as described above. For example, the frequency may increase in proportion to the amount of phase shift.

Meanwhile, it is preferable that a signal corresponding to approximately 1 to 2% of an amplified signal level of a predetermined frequency is sampled and input to the phase shifter 540. This is considered to be amplified again in the amplifier 530 after the feedback.

Next, the circulator 550 supplies the phase shifted signal from the phase shifter 540 to the amplifier 530 again. On the other hand, when the level of the phase shifted signal in the phase shifter 540 is less than the set value, the circulator 550 may supply the phase shifted signal to the ground terminal instead of the amplifier 530.

The signal supplied from the circulator 550 is amplified again by the amplifier 530. Accordingly, a plurality of microwaves having different frequencies are sequentially output.

As such, since the amplifier 530 performs its own frequency oscillation and amplification, the microwave generator 510 may be simply implemented. In addition, by using the phase shifter 540, it is possible to generate and output a plurality of microwaves.

6 is a block diagram illustrating another example of an interior of the microwave generation unit of FIG. 3.

Referring to the drawings, the microwave generator 610 of FIG. 6 is substantially the same as the microwave generator 510 of FIG. 5, and further includes at least one amplifier at an output terminal of the amplifier 630. There is a difference.

In the drawing, a plurality of amplifiers 660-1,..., 660-n are connected in parallel, but the present invention is not limited thereto and may be implemented in series, serial, or parallel mixing to implement multistage amplification. The plurality of amplifiers 660-1,..., 660-n may be, for example, RF power transistors.

By implementing as shown in Figure 6, by using a plurality of amplifiers (630,660-1, ..., 660-n), it is possible to simply generate a high-power microwave.

Meanwhile, the microwave generators 510 and 610 described in FIGS. 5 and 6 may be implemented as a solid state power module (SSPM).

7 is a block diagram illustrating another example of a cooking appliance according to an embodiment of the present invention.

Referring to the drawings, the cooking apparatus 700 of FIG. 7 includes a microwave generator 710, an RF switch 720, a plurality of microwave transmitters 712 and 713, and a plurality of feeders 717 and 718. do.

The microwave generator 710 may generate and output a plurality of microwaves having different frequencies. The plurality of microwaves may be sequentially generated and output as described above.

As described above, the microwave generator 710 may include an amplifier capable of self oscillation and amplification. That is, when dc power is supplied from the power supply unit, the oscillation and amplification may be performed without a separate frequency oscillator. In addition, as described above, the microwave generator 710 may further include a phase shifter and a circulator.

The RF switch 720 separates a plurality of microwave transmission paths. In the drawings, the first and second microwave transmitters 712 and 713 are respectively connected, but the present invention is not limited thereto and may be separated into various paths in various numbers. The first and second microwave transmitters 712 and 713 may include waveguides or coaxial cables. Feeders 717 and 718 are connected to ends of the first and second microwave transmitters 712 and 713, respectively.

The feeders 717 and 718 output microwaves that have been transmitted into the cavity 734. To this end, the feeders 717 and 718 may include an opening or an antenna. In addition, the feeders 717 and 718 may further include an amplifier. By including the amplifier, it is possible to further improve the output level of the microwave generated and output by the microwave generator 710. In this case, the amplification ratios of the amplifiers in the respective feeders 717 and 718 may be different.

On the other hand, the RF switch 720, it is possible to separate the transmission path of the microwave for each scan section and heating section.

For example, in a scan section in which high power is not required, a microwave of low power is supplied into the cavity 734 through the first microwave transmitter 712 and the first feeder 717, and in a heating section in which high power is required. Through the second microwave transmitter 713 and the second feeder 718, it is possible to supply a high power microwave into the cavity 734. The output difference between the scan section and the heating section may vary depending on the amplification ratios of the amplifiers provided in the respective feeders 717 and 718. That is, the amplifier amplification ratio of the first feeder 717 may be lower than the amplifier amplification ratio of the second feeder 718.

8 is a block diagram illustrating another example of a cooking appliance according to an embodiment of the present invention.

Referring to the drawings, the cooking apparatus 800 of FIG. 8 is almost similar to the cooking apparatus 700 of FIG. 7, but there are differences in the number of feeders and the number of microwave transmitters.

Referring to the difference, the microwave generator 810 generates and outputs a plurality of microwaves having different frequencies, and the RF switch 820 separates the microwave transmission paths into a plurality. In the drawing, the first and second microwave transmitters 812 and 813 are respectively connected.

One feeder 818 is connected to ends of the first and second microwave transmitters 812 and 813. The feeder 818 may include an opening or an antenna. In addition, the feeder 818 may further include an amplifier.

On the other hand, it is possible to distinguish the transmission path in the scan section and the heating section of the entire cooking section, respectively. For example, in a scan section in which no high power is required, the microwave of low power is supplied into the cavity 834 through the first microwave transmitter 812 and the feeder 818, and in the heating section in which high power is required, Through the two microwave transmitter 813 and the feeder 18, it is possible to supply high power microwaves into the cavity 834.

In this case, in order to differentiate the output of the scan section and the heating section, in the scan section, the microwave may be output into the cavity 834 directly through the opening or the antenna without using an amplifier provided therein. On the other hand, in the heating section, using the amplifier provided therein, the microwave amplified to a high power may be output into the cavity 834 through the opening or the antenna.

9 is a block diagram illustrating another example of a cooking appliance according to an embodiment of the present invention.

Referring to the drawings, the cooking apparatus 900 of FIG. 9 is almost similar to the cooking apparatus 700 of FIG. 7, except that feeders 917 and 918 are provided at the ends of the first and second microwave transmitters 912 and 913. The difference is that an opening or an antenna is connected without a separate amplifier. Instead, the RF switch 912 may have an amplifier. In this case, the amplifier may be used separately in the scan section and the heating section. That is, the amplifier is not used in the scan section, the amplifier may be used in the heating section. In this way, the output level difference between the scan section and the heating section can be realized.

While the above has been shown and described with respect to preferred embodiments of the present invention, the present invention is not limited to the specific embodiments described above, it is usually in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

1 is a part of a cooking appliance using a microwave according to an embodiment of the present invention

Perspective view.

2 is a cross-sectional view of the cooking appliance of FIG.

3 is a block diagram schematically illustrating the inside of the cooking appliance of FIG. 1.

4 is a diagram illustrating a change in frequency of a scan interval.

5 is a block diagram illustrating an example of an inside of the microwave generation unit of FIG. 3.

6 is a block diagram showing another example of the interior of the microwave generation unit of FIG.

All.

7 is a block diagram illustrating another example of a cooking appliance according to an embodiment of the present invention.

8 is a block diagram illustrating another example of a cooking appliance according to an embodiment of the present invention.

9 is a block diagram illustrating another example of a cooking appliance according to an embodiment of the present invention.

Claims (18)

A microwave generator having an amplifier for performing frequency oscillation and amplification, and generating and outputting microwaves; And And a feeder for outputting the output microwaves into the cavity. The method of claim 1, The microwave generator, A phase shifter for shifting the phase of the output microwave, and a circulator for supplying the phase shifted microwave to the amplifier, Cooking apparatus using a microwave, characterized in that for generating a plurality of microwaves of different frequencies in accordance with the phase shift. The method of claim 1, And a controller configured to supply a phase shift signal to the microwave generator. The microwave generation unit is a microwave cooking device using a microwave, characterized in that for generating and outputting a plurality of microwaves of the frequency variable according to the phase shift signal. The method of claim 3, The control unit, Using the microwaves supplied into the cavity and the microwaves reflected from the cavity, the heating efficiency is calculated for each frequency, and in accordance with the calculated heating efficiency, in the heating section, a plurality of micro-generated in the microwave generation unit Cooking apparatus using a microwave, characterized in that for controlling the output period or the power level of the wave to vary. The method according to claim 1 or 2, The microwave generator, And at least one amplifier connected to at least one of a series and a parallel terminal at an output of the amplifier. The method of claim 1, The amplifier, the microwave cooking apparatus comprising a RF power transistor. The method of claim 1, The microwave generator is a cooking device using a microwave, characterized in that the solid-state power amplifier module. The method of claim 1, And a RF switch for separating a transmission path of the microwave from the microwave generator. The method of claim 8, And a plurality of microwave transmitters for transmitting the microwaves separated by the RF switch to a plurality of feeders, respectively. The method of claim 8, The RF switch, Cooking apparatus using a microwave, characterized in that for separating the transmission path of the microwave in accordance with the scan section and the heating section of the entire cooking section. The method of claim 8, The feeder is provided in plurality in accordance with the scan section and the heating section of the entire cooking section, The heating section feeder, microwave cooking apparatus characterized in that it comprises an amplifier. 10. The method of claim 9, The feeder includes an amplifier, Microwaves input to the feeder in the scan interval of the entire cooking period is emitted to the cavity, Microwaves input to the feeder in the heating section of the entire cooking section is amplified by the amplifier and emitted to the cavity. A microwave generator for generating and outputting a plurality of microwaves; An RF switch separating the transmission path of the microwave; And And a feeder for outputting the microwave output from the RF switch into the cavity. The method of claim 13, And a plurality of microwave transmitters for transmitting the microwaves separated by the RF switch to a plurality of feeders, respectively. The method of claim 13, The RF switch, Cooking apparatus using a microwave, characterized in that for separating the transmission path of the microwave in accordance with the scan section and the heating section of the entire cooking section. The method of claim 13, The feeder is provided in plurality in accordance with the scan section and the heating section of the entire cooking section, The heating section feeder, microwave cooking apparatus characterized in that it comprises an amplifier. The method of claim 13, The feeder includes an amplifier, Microwaves input to the feeder in the scan interval of the entire cooking period is emitted to the cavity, Microwaves input to the feeder in the heating section of the entire cooking section is amplified by the amplifier and emitted to the cavity. The method of claim 13, The RF switch includes an amplifier, Microwaves input to the RF switch in the heating section of the whole cooking section is amplified by the amplifier and transmitted to the feeder, characterized in that the microwave oven.

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