KR20160012741A - A plasma generating module and plasma process apparatus comprising the same - Google Patents

Abstract

Provided are a plasma generating module and a plasma processing apparatus including the same. The plasma generating module comprises: a power load receiving radio frequency (RF) power; a plurality of load units forming an inductive electric field by receiving the RF power, and divided into at least two load groups based on an impedance value; and at least two power distribution units arranged to be separated in a lengthwise direction on the power load, and connected to different load groups respectively to transfer the RF power, thereby making RF power applied to each antenna uniform to finally form uniform plasma.

Description

TECHNICAL FIELD [0001] The present invention relates to a plasma generating module and a plasma processing apparatus including the plasma generating module.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power distribution unit of a plasma generation module and a plasma generation module including the same. More particularly, the present invention relates to a plasma generation module including a plurality of antennas and a plasma generation device.

In an apparatus for performing a substrate process such as CVD (Chemical Vapor Deposition) or etching using plasma, there is a method in which RF power is applied to an apparatus including an antenna to generate an induction electric field around the antenna to generate plasma . On the other hand, as the size of the substrate to be processed is increased, the size of the processing apparatus is also increasing. In order to uniformize the size of the substrate, it is common to use a substrate processing apparatus having a plurality of antennas. On the other hand, when a substrate is processed by configuring an antenna, a uniform current can be uniformly applied to a plurality of antennas so that plasma generated in each antenna can be uniformly generated.

Korean Patent Registration No. 10-10766740000 discloses a configuration in which a plurality of antennas are provided and a substrate is processed by generating plasma.

However, in such a configuration, the power is applied without taking into consideration the deviation of the power consumption due to the difference of the impedance value from the RF power source to each antenna, the difference of the impedance value according to the characteristic of each antenna, etc. Therefore, A deviation may occur, resulting in a problem that the plasma becomes uneven.

Korean Patent No. 10-10766740000

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plasma generating module and a plasma processing apparatus for solving the problem that uneven power is applied to each antenna of the above-described conventional plasma generating apparatus.

According to an aspect of the present invention, there is provided a power supply apparatus comprising: a power load to which RF power is applied; a plurality of load units that form an induction field by receiving RF power and are classified into at least two load groups based on an impedance value; There is provided a plasma generating module comprising at least two or more power distributing units arranged on a power rod and each connected to a different load group to transmit RF power.

Further, the plurality of load groups may be configured so that, as the impedance value is larger, the load group is connected to a power distribution unit close to one side to which the RF power of the power rod is applied.

Each of the power distributing units may include at least one power distributing unit having a different size.

Furthermore, the power distributing unit includes a first power distributing unit and a second power distributing unit sequentially arranged in a direction in which RF power is applied to the power rod, and the load group is divided into a first load Group and a second load group, wherein the first power distributor is connected to the first load group, and the second power distributor is connected to the second load group, respectively.

Meanwhile, the load unit may include an antenna and a connection unit connecting the antenna and the power distribution unit.

The load group may be classified according to the impedance value of the antenna, and may be classified according to the impedance value of the connection part.

Specifically, the power distributing unit includes a first power distributing unit, a second power distributing unit, and a third power distributing unit that are sequentially disposed according to a direction in which RF power is applied to the power rod. The load group has a magnitude of an impedance value The first power distributing unit is divided into a first load group, the second power distributing unit is divided into a second load group, the third power distributing unit is divided into a first load group, a second load group and a third load group, And a power distribution section, respectively.

Furthermore, nine load units are provided, the antennas included in each load unit are arranged in a planar lattice, the four load units including the antennas arranged at the corners are classified into the first load group, One load unit including the antenna that has been classified into the third load group, and the load unit including the remaining four antennas that are not classified can be classified as the second load group.

In addition, there are 16 load units, the antennas included in each load unit are arranged in a planar lattice, the four load units including antennas arranged at corners are classified into the first load group, The four load units including the antenna that are not classified are classified into the third load group, and the load units including the remaining eight unassigned antennas can be classified as the second load group.

On the other hand, A distributing portion formed of a ring structure and configured such that one end of each load group is connected, and a supporting portion radially connected between the distributing portion and the power rod. Furthermore, the support portions may be provided in four positions so as to be arranged at intervals of 90 degrees in the rotation direction.

In addition, as a means for solving the problem according to the present invention, there is a chamber, a power rod which is disposed inside the chamber and to which RF power is applied, an RF electric power is applied to form an induction field inside the chamber, There is provided a plasma processing apparatus comprising a plurality of load units classified into a load group, a power distributing unit disposed on the power rod, each of the load units being connected to different load groups to transmit RF power.

The plasma generating module and the plasma generating module according to the present invention can uniformly process the substrate by generating a plasma by applying a uniform current to each of the plurality of antennas through the power distributing unit.

1 is a cross-sectional view of a plasma generating apparatus according to a first embodiment of the present invention.
2 is a perspective view of a plasma generating module according to a first embodiment of the present invention.
3 is a perspective view of a power rod and a power distributor according to a first embodiment of the present invention.
4 is a perspective view showing a modification of the power distributor of the present invention.
5 is a cross-sectional view of a power rod and a power distributor according to a first embodiment of the present invention.
6 is a cross-sectional view of a plasma generating module according to a first embodiment of the present invention.
7 is a cross-sectional view of a plasma generating module according to a second embodiment of the present invention.
8 is a cross-sectional view of a plasma generating module according to a third embodiment of the present invention.
9 is a view showing a modification of the load group of the present invention.
10 is a plan view showing still another modification of the power rod and power distributor of the present invention.

Hereinafter, a plasma generating module according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the embodiments, the names of the respective components may be referred to as other names in the art. However, if there is a functional similarity and an equivalence thereof, the modified structure can be regarded as an equivalent structure. In addition, reference numerals added to respective components are described for convenience of explanation. However, the contents of the drawings in the drawings in which these symbols are described do not limit the respective components to the ranges within the drawings. Likewise, even if the embodiment in which the structure on the drawing is partially modified is employed, it can be regarded as an equivalent structure if there is functional similarity and uniformity. Further, in view of the level of ordinary skill in the art, if it is recognized as a component to be included, a description thereof will be omitted.

1 is a cross-sectional view of a plasma processing apparatus according to a first embodiment of the present invention. Here, the plasma processing apparatus means an apparatus applied to a process of generating a plasma by using a process gas to process a substrate, and may be a variety of apparatuses such as a substrate deposition apparatus, a substrate etching apparatus, and an ion implantation apparatus.

As shown, the plasma processing apparatus according to the present embodiment may include a chamber 10, a stage 30, an antenna mounting unit 80, and a plasma generating module 90.

First, the chamber 10 is formed in a closed structure surrounded by a plurality of wall surfaces, and constitutes the body of the plasma processing apparatus. The interior of the chamber 10 is largely composed of a process space 20 in which a substrate is accommodated and a substrate processing process is performed and an antenna mounting unit 80 in which a load unit 300 of a plasma generating module 90 . The antenna mounting part 80 is disposed on the upper side of the inside of the chamber 10 and the process space 20 can be located on the lower side of the antenna mounting part 80. In addition, the plasma generation module 90 indicated by a dotted line may be disposed inside or above the antenna mounting portion 80.

Although not shown in FIG. 1, a gate valve (not shown) may be formed at one side of the chamber 10 to allow the substrate to flow in and out. A process gas used in the substrate processing process may be introduced into the process space A gas supply unit (not shown) and a gas exhaust unit (not shown) for supplying the exhaust gas to the exhaust gas outlet 20 and exhausting the exhaust gas to the outside can be provided.

On the other hand, a stage 30 is provided inside the process space 20. As shown in Fig. 1, the stage 30 is configured to support the substrate S, and the substrate S can be processed while being placed on the stage 30. Fig. A bias electrode 40 connected to an external RF power source unit 50 may be formed on the stage 30 to control the distribution of the plasma formed on the process space 20. 1, a temperature adjusting member such as a heater (not shown) may be provided inside the stage 30 to adjust the temperature of the substrate during the substrate processing process.

As described above, the antenna mounting portion 80 is provided on the upper side of the stage 30 to form a space in which the antenna 310 is installed. The antenna mounting portion 80 forms a space partitioned from the process space 20 by at least one window 81. The window 81 may be supported by a support member 82 installed on the wall surface of the chamber 10. [ The window 81 may be formed of a metal material or may be formed of a dielectric material other than a metal material.

The plasma generation module 90 generates an induction electric field inside the process space 20 to generate plasma from the process gas in the process space 20. The plasma generating module 90 includes a power load 100, a load unit 300, and a power distributor 200, which will be described in detail later.

 The load unit 300 includes an antenna 310 and a connection unit 320, and may include a plurality of antennas 310. Each of the antennas 310 may be evenly distributed on the upper side of the process space 20 (inside the antenna mounting part). Accordingly, the distribution of the plasma generated inside the process space 20 during the substrate processing process can be uniformly controlled or precisely controlled for each zone.

In this embodiment, one antenna 310 is disposed in one unit area. However, the present invention is not limited to this, and a plurality of antennas 310 may be disposed in the unit area. In addition, the structure divided into nine unit areas in FIG. 2 is merely an example, and the unit area may be divided into various patterns and the corresponding antenna 310 may be disposed.

The RF power supply 60 is provided outside the plasma generator to provide a radiofrequency power to the antenna 310. The matching unit 70 is provided between the high frequency power source 60 and the input unit 300 and is capable of performing impedance matching between the high frequency power source 60 and the antenna yarn 310. The matching unit 70 is composed of a circuit including a variable capacitor or a variable inductor, and performs impedance matching in such a manner as to control the variable capacitor or the variable inductor. However, since the configuration of the high-frequency power source and the matching portion is widely applied, a detailed description thereof will be omitted.

Hereinafter, the plasma generating module according to the first embodiment of the present invention will be described in detail with reference to FIGS. 2 to 5. FIG.

2 is a perspective view of a plasma generating module 90 according to a first embodiment of the present invention. FIGS. 3 and 4 are perspective views of a power rod 100 and a power distributor 200, And a power distributor 200 according to an embodiment of the present invention.

2 to 5, a plasma generating module 90 according to the present invention includes a power load 100, two or more power distributing units 200, and two or more load units 300 do.

The power rod 100 is composed of a conductor member, and one side thereof is connected to the external matching portion 70. The RF power source 60 is connected to the matching unit 70 from the outside of the power distributor 200 and the RF power matched with the impedance value of the plasma generating module 90 is applied to the power rod 100.

One side of the power distribution unit 200 is electrically connected to the power rod 100 to receive RF power, and the other side is electrically connected to the plurality of load units 300. In addition, they may be disposed on the power rod 100 in the longitudinal direction, and may be composed of at least two conductor members. 2 and 3, the power distributor 200 is configured to have the same shape and size. However, as shown in FIG. 4, each power distributor 200 includes a power distributor 200 having a different size And the magnitude of the impedance value may be different depending on the size of each of the power distributor 200. In addition, Therefore, the impedance value from the point where the RF power of the power rod 100 is applied to the power distributor 200 is changed, and the impedance value is compensated for by being connected to each load group to be described later .

The power distributor 200 may have various shapes. For example, as shown in FIG. 3, the power distributor 200 may include a distributor and a support 201. The distributing unit may have a ring structure, one end of each of the load groups may be connected, and the supporting unit 201 may be configured to be connected between the distributing unit and the power rod 100 in a radial direction. As shown in FIG. 4, the support portions 201 may be arranged at intervals of 90 degrees in the rotation direction. When the support portions 201 are connected to the distribution portion, RF power So that the noise that can be structurally generated can be minimized. Meanwhile, since the power distributor 200 is connected at the same distance from the power rod 100 to transmit the RF power to the load groups 400, the power distributor 200 performs a kind of common line function, To the same power.

The load unit 300 receives RF power from the power distributor 200 to form an induction field, and converts the gas supplied to the process space 20 into plasma. The load unit 300 includes an antenna 310 and a connection unit 320 formed of a conductor connecting the antenna 310 and the power distribution unit 200. The load unit 300 is classified into a plurality of load groups based on the impedance value. The impedance value may be generated by various causes such as a deviation due to the shape, size, material, etc. of the antenna 310 and the connecting part 320, electromagnetic interference between the elements, The distance difference of the path up to < RTI ID = 0.0 >

Referring again to FIG. 2, in the first embodiment, the load groups are classified into three, the connecting portion 320 of the first load group 410 is indicated by a dotted line, the connecting portion 320 of the second load group 420 is formed by a thin solid line And the connecting portion 320 of the third load group 430 are indicated by thick solid lines. Each load group may be configured to include a plurality of load units 300, such as a first load group 410 and a second load group 420, Only the unit 300 may be included.

However, the shape of the antenna 310 is not limited to the illustrated shape, but may be a combination of antennas of various shapes, such as a linear antenna and a circular antenna, and a combination of antennas 310 of the same size, For example, a combination of antennas 310 having a plurality of circular shapes having the same central axis but different radii.

The method of classifying the load unit 300 in the present invention and the connection relationship between the power distributor 200 and the load unit 300 will be described in detail with reference to FIGS. 5 to 8. FIG. However, when the RF power of the same frequency is applied, the impedance value does not change at the corresponding frequency. Therefore, the same frequency is applied to the plasma generation module 90 so that the impedance values are the same Will be described below.

5 is a sectional view of the power rod 100 and the power distributor 200 according to the first embodiment of the present invention.

As shown in the drawing, the first embodiment of the present invention includes three power distributing units 200, that is, a first power distributing unit 210, a second power distributing unit 220, And a power distribution unit 230. [

Each of the power distributing units 200 is spaced apart from each other in the longitudinal direction of the power rod 100 so that the impedance from the point where the RF power of the power rod 100 is applied to the end of each power distributing unit 200 The difference in values Z1, Z2, Z3 occurs.

Since the resistance value of a general member increases with an increase in length, the value of the impedance to each power distributor 200 can also be generally set such that Z1 < Z2 < Z3. In the case where the material, the shape, and the size of each power distributor 200 are configured to be the same, the impedance values of the power distributor 200 itself may be equal to each other. Accordingly, the values of Z1, Z2, and Z3 are determined according to the difference in impedance value from one point on the power rod 100 to which the RF power is applied to each power distributor 200. [ Specifically, the difference in impedance value may be generated depending on whether or not the impedance value of a portion of the power rod 100 is reflected according to the distance that the power distributor 200 is spaced apart from Z1, Z2, and Z3, respectively.

Although not shown, the structure, material, shape, and the like of the power distributor 200 itself may be configured differently so that the impedance values of the power distributor 200 may be different, and the impedance values Z1, Z2, and Z3 As shown in FIG.

FIG. 6 is a cross-sectional view of a plasma generating module 90 according to the first embodiment of the present invention, and shows a cross section of a configuration in which each load unit 300 is connected to a power distributor 200. The load unit 300 may include an antenna 310 and a connection unit 320 connecting the antenna 310 and the power distribution unit 200. As described above, Further, the plurality of load units 300 can be classified into the first load group 410, the second load group 420, and the third load group 430 according to the respective impedance values. At this time, the difference between the impedance values is determined by the difference in shape, size, etc. of each antenna 310 constituting each load unit 300 or the size, shape, Can be caused by differences.

In order to explain the concept of the present invention, not all the load units 300 are shown, only one load unit 300 among the load units 300 belonging to each load group is shown, Only one side is shown.

As shown in the figure, when the impedance values from the portion indicated by the double-headed arrow, that is, from the end of each power distributor 200 to the end of the load unit 300 are measured, the average impedance values Zg1 and Zg2 , And Zg3 have the order of size Zg1> Zg2> Zg3 as an example. It has been described above that the deviation of the impedance value can be caused by a difference in the structure, material, shape, size arrangement relation, and the like of the antenna 310 and the connection portion 320.

The first load group 410 having the largest impedance value is connected to the first power distributor 210 and the second load group 420 having the intermediate value is connected to the second power distributor 210. In order to compensate for the deviation of the impedance value of each load group, And the third smallest load group 430 may be connected to the third power distribution unit 230. [ The sum of the impedances from the respective power distributor 200 to the ends of the antenna 310 after the connection is the sum of the impedance values of the series connection becomes Zg1 + Z1, Zg2 + Z2 and Zg3 + Z3 respectively. As a result, the difference between the impedance values of the respective load units 300 can be compensated for by the difference between the impedance values of the power load 100 and the power distributor 200, so that the deviation can be minimized. That is, the larger the impedance value, the more the load group can be connected to the power distributor 200 near the point where the RF power of the power rod 100 is applied.

At this time, it is possible to compensate the impedance value by adjusting the separation distance of each power distributor 200 in consideration of the deviation between the respective load groups measured in advance. Further, the amount of impedance increase between the power distributing parts 200 can be varied by varying the members of the power rod 100, and the values of Z1, Z2, and Z3 can be variously changed.

That is, when the impedance value deviates greatly between the respective load groups, it can be constituted as a member in which the change of the impedance value according to the length greatly increases. On the contrary, when the deviation is small, it is possible to configure the compensation to be performed optimally by making a difference in the amount of change of the impedance value according to the separation distance by selecting the member whose variation with the length is slightly increased.

7 is a cross-sectional view of a plasma generating module 90 according to a second embodiment of the present invention. It is divided into a first load group 410 and a second load group 420 on the basis of an impedance value of the antenna 310 Is shown. The second embodiment may have the same constituent elements as those of the first embodiment, and a description thereof will be omitted in order to avoid redundant description, and only the modified or added constituent elements will be described below.

In this embodiment, unlike the first embodiment, a configuration applicable to a case where the shape, the size, and the like of the respective antennas 310 are different and the impedance value is different is shown. For the sake of understanding, the antenna 310 having a large impedance value is shown somewhat longer in FIG. For example, as in the case where the plurality of circular antennas are configured with the same axis as the central axis, the radii and sizes of the respective antennas 310 are different from each other and a difference in impedance value between the respective antennas 310 occurs .

The lengths of the connection portions 320 may be the same, and the impedance values may be the same, so that the deviation of the impedance values of the connection portions 320 may not be considered.

Therefore, in this embodiment, the first load group 410 and the second load group 420 are divided according to the impedance value of the antenna 310 alone, and the first load group 410 having a large impedance value is divided into the first power group 410 and the second load group 420, And the second load group 420 having a small impedance value is connected to the second power distributor 220 to compensate for the deviation of the impedance value between the load groups 310 .

However, in the present embodiment, the impedance values of only the antenna 310 are taken into consideration and classified into two load groups. However, this is an example only, and the load groups are classified into a plurality of load groups, Respectively, to compensate for the impedance value.

Hereinafter, a third embodiment according to the present invention will be described with reference to FIG.

8 is a cross-sectional view of a plasma generating module 90 according to a third embodiment of the present invention, in which the load unit 300 is divided in consideration of impedance values of the connecting parts 320 alone. In the present embodiment, the same components as those in the above-described embodiment can be included. In order to avoid redundant description, a detailed description will be omitted and only the changed or added components will be described below.

The impedance values of the respective antennas 310 are the same as those of the plasma generation module 90 constructed in the same manner so that only the impedance values of the connection parts 320 are considered, The first load group is divided into the first power distributor 210 and the second load group 420 is divided into the load group 410, the second load group 420 and the third load group 430 The third load group 430 is connected to the second power distributor 220 and the third load distributor 230 is connected to the third load distributor 230. The deviation of the impedance value of each group is controlled by the power load 100 and the power The impedance value of the distribution unit 200 can be compensated for and minimized.

9 is a diagram showing a load unit 300 classified according to a load group according to a modification of the present invention.

As shown in FIG. 9A, nine antennas 310 are arranged in a 3x3 lattice shape and their shapes are not shown. However, each antenna 310 has the same shape and impedance values are the same Lt; / RTI &gt; Further, although not shown, the power rod 100 and the power distributor 200 may be located above the central portion of the plane.

The distance from the power distributor 200 to the antenna 310 is different from the four antennas on each corner, the four antennas on each side of the central antenna, and one antenna in the center. Therefore, the length of the connecting part also changes, so that the impedance value also changes. The load groups are divided into three load groups according to the magnitude of the impedance value of each load group, and the antennas 310 belonging to the same group are represented by the same hatching. The load unit 300 including the antenna 310 disposed at the four corners is the first load group 410 and the load unit 300 including one antenna 310 disposed in the vicinity of the center is the third load group 300. [ The load unit 300 including the remaining four antennas 310 can be classified as the second load group 420. [

Accordingly, the first load group 410 is connected to the first power distributor 210, the second load group 420 is connected to the second power distributor 220, And it is possible to apply the same current to each antenna by distributing the power according to the impedance value of each load group.

FIG. 9 (b) is a view showing a modification in which 16 antennas are arranged in a 4x4 plane lattice pattern. In this case, the antennas belonging to the same load group are represented by the same hatching, and each of the load groups is divided into three groups according to the distance from the center of the arrayed antenna 310, Respectively. On the other hand, the shape of the antenna can be variously configured as in FIG. 9 (a). Also, the plurality of antennas can be classified into three load groups, and the load unit 300 including the four antennas 310 at each corner portion is divided into the first load group 410, The load unit 300 including the first antenna 310 may be classified as the third load group 430 while the load unit 300 including the remaining eight antennas 310 may be classified as the second load group 420. [

10 is a plan view showing still another modification of the power rod and power distributor of the present invention.

As shown in the figure, the power rod 100 is branched in four directions at intervals of 90 degrees on a plane, and the lengths of the power rods 100 may be different from each other, and the power distributor 200 may be connected to each end of the power rod 100 have. Each of the power distribution units 200 may be connected to a load group including four antennas 310 based on the impedance value.

Further, the plasma generation module 90 according to the present invention is not limited to the number of the antennas 310 shown in FIG. 9, but can be applied to various numbers of the antennas 310, And the like.

As described above, according to the plasma generation module 90 according to the present invention, in the plasma generation module 90 including the plurality of antennas 310, according to the difference of the impedance values of the respective load groups, The plasma may be generated due to the variation of the current applied to the plasma display panel.

More specifically, the antennas 310 and 320 are classified into a plurality of groups according to impedance values of the connection unit 320 connecting the power distributor 200 and the antennas 310, and connected to the different power distributor 200 , It is possible to compensate for the difference in the impedance value between the groups.

 Accordingly, a uniform current can be applied to each load unit 300, so that each antenna 310 can form a uniform induction field and can generate a uniform plasma in the process space 20 Therefore, there is an effect that the large substrate can be treated uniformly.

 While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, . Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .

90: Plasma generating module
100: Power load
200: power distribution part 201: support part
210: first power distributor 220: second power distributor 230: third power distributor
300: load unit 310: antenna 320:
410: first load group 420: second load group 430: third load group

Claims (15)

A power rod to which RF power is applied;
A plurality of load units that receive the RF power to form an induction field and are classified into at least two load groups based on an impedance value; And
And the power distribution unit comprises at least two or more power distribution units arranged in the longitudinal direction on the power rod and connected to different groups of the loads to transmit the RF power. The method according to claim 1,
The load group includes:
Wherein the power distributor is connected to different power distributors so that a difference in the impedance value between the load groups is compensated for by a difference in impedance value from a point where the RF power of the power rod is applied to each of the power distributors. Generation module. 3. The method of claim 2,
The load group includes:
And the power supply is connected to the power distribution portion closer to the point where the RF power of the power rod is applied as the impedance value increases. 3. The method of claim 2,
The power distributor may include a first power distributor and a second power distributor sequentially disposed along the direction in which the RF power is applied to the power rod,
The load group is classified into a first load group and a second load group in order of magnitude of the impedance value,
Wherein the first power distributor is connected to the first load group, and the second power distributor is connected to the second load group, respectively. 3. The method of claim 2,
Wherein the load unit includes an antenna and a connection unit connecting the antenna and the power distribution unit. 6. The method of claim 5,
And the load unit is classified into the load group based on an impedance value of the antenna. 6. The method of claim 5,
Wherein the load unit is classified into the load group based on an impedance value of the connection unit. 8. The method of claim 7,
And the impedance values of the antennas are the same. 3. The method of claim 2,
Wherein each of the power distributing units includes at least one or more power dividing units having different sizes. 3. The method of claim 2,
The power distributor includes a first power distributor, a second power distributor, and a third power distributor, which are sequentially disposed in accordance with a direction in which the RF power is applied to the power rod,
The load group is classified into a first load group, a second load group, and a third load group in order of magnitude of the impedance value,
Wherein the first power distributor is connected to the first load group, the second power distributor is connected to the second load group, and the third power distributor is connected to the third power distributor. 11. The method of claim 10,
The load units are provided in nine, and the plurality of antennas included in each of the load units are arranged in a 3x3 plane grid,
The four load units including the antennas disposed at the corners are classified into the first load group and one load unit including the antennas disposed adjacent to the center is classified into the third load group, And the load units including the remaining four antennas are classified into the second load group. 11. The method of claim 10,
Wherein the number of the load units is sixteen, the plurality of antennas included in each of the load units are arranged in a 4x4 planar grid,
The four load units including the antennas disposed at the corners are classified into the first load group and the four load units including the antenna disposed adjacent to the center are classified into the third load group, And the load units including the remaining eight antennas are classified into the second load group. 3. The method of claim 2,
Each of the power distributing units includes:
A distributor unit having a ring structure and configured such that one end of each of the load groups is connected,
And a support portion radially connected between the power distributing portion and the power rod. 14. The method of claim 13,
Wherein the support portions are provided at four intervals so that the support portions are arranged at intervals of 90 degrees in the rotation direction. chamber;
A power rod disposed inside the chamber and to which RF power is applied;
A plurality of load units which receive the RF power to form an induction field in the chamber and are classified into at least two load groups based on the impedance value; And
And a power distribution unit disposed on the power rod and spaced apart from each other in the longitudinal direction and connected to the different load groups to transmit the RF power.

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