KR20160044861A - RF Cavity Device Capable of Automatic Tuning - Google Patents

Abstract

Disclosed is an RF cavity device for automatic tuning. The disclosed device comprises: a housing; a plurality of cavities which are formed inside the housing; resonators which are accommodated in the cavities, respectively; and a cover which is coupled to the top of the housing. The cavities are arranged to form a plurality of filtering lines in each of which filtering is independently performed. Short pins each of which is electrically separated from one of the resonators accommodated in first cavities in a first state and each of which is electrically short-circuited from one of the resonators accommodated in the first cavities in a second state are inserted into the first cavities coupled to input ports on the respective filtering lines through the cover. According to the disclosed device, an advantage arises in that automatic tuning can be easily achieved by using the short pins.

Description

TECHNICAL FIELD [0001] The present invention relates to an RF cavity device capable of automatically tuning,

Embodiments of the present invention relate to an RF cavity device, and more particularly, to an RF cavity device capable of autotuning.

With the development of mobile communication, there is a growing demand for RF cavity devices such as filters, duplexers, diplexers and the like. RF devices are used for signal filtering, signal separation and transmission in a base station of a mobile communication system, and a diplexer is a device used for separating signals having different frequency components.

FIG. 1 is an exploded perspective view showing a structure of a diplexer which is one of conventional RF cavity devices, and FIG. 2 is a plan view of a diplexer which is one of conventional RF cavity devices.

1, a conventional diplexer includes a housing 100, an input connector 102, output connectors 130 and 132, a cover 106, a plurality of cavities 108, 110, 112 and 114, and resonators 120, 122, 124, 126).

The diplexer divides the RF signal provided from the input connector 102 into two paths according to the frequency. The cavities 108 and 110 and the resonators 120 and 122 filter only the signals of the first frequency band And the cavities 112 and 114 and the resonators 124 and 126 filter only the signals of the second frequency band and output them to the second output connector.

In this specification, the filtering line consisting of the cavities 108 and 110 and the resonators 120 and 122 is referred to as a first filtering line 150. The first filtering line passes only the signal of the first frequency band, Lt; / RTI > Further, the lines of the cavities 112 and 114 and the resonators 123 and 126 are referred to as a second filtering line 152, and the second filtering line passes only the signal of the second frequency band and blocks the signals of the other band.

Accordingly, when the input signal includes signals of two frequency bands, the signal of the first frequency band is output through a path connected to the first output connector 130, and the signal of the second frequency band is output to the second output connector 130. [ (132).

Such a diplexer is a structure in which two RF filters for filtering signals of different bands are combined.

A plurality of tuning bolts 200, 202, 204, 206, 208, 210 are inserted into the diplexer housing through the cover 106 of the diplexer. Tuning bolts 200, 202, 204 are tuning bolts for tuning the resonant frequency and bandwidth of the first filtering line 150 and tuning bolts for tuning the resonant frequency and bandwidth of the second filtering line 152 It is a tuning bolt.

Tuning bolts are divided into tuning bolts for adjusting the resonant frequency of the diplexer and tuning bolts for adjusting the coupling bandwidth by adjusting the coupling value.

The tuning bolts 200 and 204 of the first filtering line and the tuning bolts 206 and 210 of the second filtering line are tuning bolts for adjusting the resonance frequency of the diplexer and are located at the top of the resonator, To adjust the resonance frequency of the diplexer. Tuning bolts 200 and 204 are used to adjust the resonant frequency of the first filtering line and tuning bolts 206 and 210 are used to adjust the resonant frequency of the second filtering line.

On the other hand, a tuning bolt for adjusting the bandwidth is inserted corresponding to the coupling windows 160 and 162 formed for the resonance period coupling, and the tuning bolt 202 adjusts the coupling value of the first filtering line Is used to adjust the bandwidth of the filtering line and the tuning bolt 208 is used to adjust the bandwidth of the second filtering line through adjustment of the coupling value of the second filtering line.

FIG. 3 is a cross-sectional view of a first filtering line of the conventional diplexer shown in FIGS. 1 and 2. FIG.

Referring to FIG. 3, the tuning bolts 200 and 204 are penetrated from the cover 106 and positioned above the resonator. The tuning bolts 200 and 204 may be made of a metal material and are coupled to the cover by screwing, so that the insertion depth of the tuning bolts 200 and 204 can be adjusted by rotation.

The tuning bolts 200 and 204 may be manually rotated and a separate tuning machine for rotating the tuning bolts may be used. It is possible. The tuning bolt is fixed by the nut when the tuning is done in the proper position.

On the other hand, the tuning bolt 202 for adjusting the bandwidth is also coupled to the cover by screwing, so that the insertion depth is adjusted by rotation.

On the other hand, a method of automatically tuning an RF cavity device having a plurality of filtering lines, such as a diplexer, is disclosed in Laid-Open Patent Application No. 2013-0011046. In an RF cavity device having a plurality of filtering lines, a method of shorting the first resonator of another filtering line (resonator of the cavity coupled with the input port) and tuning the corresponding filtering line to tune the resonance frequency of a particular filtering line, There is a bar.

Conventionally, in order to perform automatic tuning using such a tuning method, the tuning bolt had to be brought into contact with the resonator in order to short-circuit the first resonator. However, the RF cavity device having a specific structure has a problem that it is difficult to contact the tuning bolt during the resonance period.

The present invention proposes an RF cavity device capable of easily performing automatic tuning.

To achieve the above object, according to a preferred embodiment of the present invention, A plurality of cavities formed in the housing; A resonator accommodated in each of the plurality of cavities; Wherein the cavities are arranged to form a plurality of filtering lines that are independently filtered and wherein the first cavities associated with the input ports in each of the plurality of filtering lines are provided with a first There is provided an RF cavity device in which short pins electrically spaced from one of the resonators housed in the first cavities and electrically shorted with one of the resonators housed in the first cavities in the second state are inserted through the cover.

Wherein the cover has a first hole at a predetermined position corresponding to the first cavities, a sliding hole connected to the first hole, and a second hole connected to the sliding hole, A pin is inserted through the first hole, and in the second state, the short pin is inserted through the second hole.

When the first resonators are short-circuited, the short pins are moved from the first holes to the second holes through the sliding holes.

Wherein the contact member has a cylindrical shape and includes a first diameter portion having a first diameter and a second diameter portion having a second diameter that is relatively smaller than the first diameter, Wherein at least a portion of the second diameter portion is inserted into the first cavities when the pressing member is pressed.

In a state in which the pressing member is pressed, the short pin is moved to the second hole through the sliding hole.

The contact member further includes a tapered portion formed between the first diameter portion and the second diameter portion, the diameter of which gradually changes.

The short pin includes a contact member and a nut for fixing the contact member.

The contact member is cylindrical in shape and includes a first diameter portion having a first diameter and a second diameter portion having a second diameter that is a relatively small diameter relative to the first diameter.

The contact member is moved from the first hole to the second hole through the sliding hole while at least a part of the second diameter portion is inserted into the cavity, and after the second hole is moved to the second hole, Contacts one of the resonators housed in the cavities.

According to another aspect of the present invention, there is provided a filter comprising: a plurality of filtering lines including a plurality of cavities; A cover coupled to an upper portion of the plurality of cavities; A resonator accommodated in each of the plurality of cavities; And a short pin inserted through the cover into the first cavities of each of the plurality of filtering lines and controlling the shorting and release of the resonators received in the first cavities.

The short pin is electrically shorted to one of the resonators received in the first cavities in a first state and electrically spaced from one of the resonators received in the first cavity in a second state.

According to the present invention, automatic tuning can be easily performed using a short pin.

1 is an exploded perspective view showing a structure of a general diplexer to which the present invention is applied.
2 is a plan view of a general diplexer to which the present invention is applied;
3 shows a cross-sectional view of a first filtering line of the general diplexer shown in Figs. 1 and 2. Fig.
4 is a diagram illustrating a configuration of an automatic tuning device for automatic tuning of an RF cavity device according to an embodiment of the present invention.
5 is a block diagram showing the configuration of a control unit of an automatic tuning device used for automatic tuning of the RF cavity device of the present invention.
6 is a cross-sectional view of a first cavity connected to an input port in an RF cavity device according to an embodiment of the present invention;
7 is a view showing a shape of a hole formed in a cover for moving a short pin in an RF cavity device according to an embodiment of the present invention;
8 is a view showing an operation in which a short pin moves and contacts a resonator according to an embodiment of the present invention;
9 is a cross-sectional view of a first cavity connected to an input port in an RF cavity device according to another embodiment of the present invention;
10 is a view showing an operation in which a short pin of a RF cavity device moves and contacts with a resonator according to another embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

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

4 is a diagram illustrating a configuration of an automatic tuning device for automatic tuning of an RF cavity device according to an embodiment of the present invention.

The RF cavity device of the present invention is an apparatus including a plurality of filtering lines, including a diplexer, a multiplexer, and a duplexer.

4, an automatic tuning device used for automatic tuning of the RF cavity device of the present invention includes a network analyzer 400, a parameter extraction unit 402, a control unit 404, and a tuning drive unit 406 .

The automatic tuning device shown in Fig. 4 allows tuning for a plurality of filtering lines to be performed independently.

In order to perform such independent tuning, the network analyzer 400 preferentially performs a task of shortening the first resonator of the filtering line other than the filtering line to be measured by the tuning driving unit before the parameter measurement operation (400).

After placing the RF cavity device in the automatic tuning unit, the first resonator of the filtering line outside the filtering line to be measured is shorted to enable independent tuning. For example, according to the control of the control unit, the tuning drive unit 406 may short-circuit the first notifier of the filtering line other than the filtering line to be measured so that independent tuning is possible.

The network analyzer 400 functions to measure the filter characteristics of the filtering line to be measured ("subject filtering line"). The network analyzer measures the filter characteristics of the target filtering line after the first resonator shot of the other filtering line other than the target filtering line is completed. The network analyzer 400 outputs an S parameter for the input signal and an output signal, and the S parameter waveform is displayed on the display of the network analyzer 400. [ In the conventional manual tuning, the operator directly tunes while viewing the waveform displayed on the display of the network analyzer 400, but the autotuning apparatus of the present invention analyzes the S parameter measured by the network analyzer 400 and performs the tuning automatically .

The S parameter measured in the network analyzer 400 is digital data, and the S parameter of the entire band is output, and the S parameter of the interest band of the S parameter is read out in the parameter extracting unit 402. Of course, the network analyzer 400 may be set such that only the S parameter of the band of interest is output.

A slicing window may be used to read only the data of the interest band among the S parameters output from the network analyzer 400. [

For example, if the center frequency of the S parameter read in the network analyzer is 2.2 GHz, the S parameter is read by applying a slicing window around 2.2 GHz. When the bandwidth of the slicing window is 2 GHz, the S parameter of 1.2 GHZ to 3.2 GHz is read.

For example, a method of forming a slicing window based on the center frequency of the tuned model device and reading the S parameter may be used.

The parameter extraction unit 402 uses the slicing window to read the S parameter of the band of interest and models the transfer function of the filtering line of interest. The transfer function of the target filtering line is a function having a frequency as a variable and has a degree corresponding to the number of poles of the target filtering line. The transfer function can be obtained by applying various mathematical algorithms, which are well known in the art, and thus a detailed description thereof will be omitted.

The parameter extracting unit 402 extracts the filter marameters of the target filtering line using the modeled transfer function. In one example, the filter parameters can extract the resonant frequency and the coupling value. The resonant frequency can be extracted by finding the frequency that maximizes the transfer function.

The control unit 404 generates tuning control information for automatic tuning using the filter parameters extracted from the parameter extracting unit 402. [ 3 shows that the parameter extracting unit 402 and the control unit 404 are shown as separate modules, but it is understood by those skilled in the art that a single device such as a PC can perform both the operation of the parameter extracting unit and the control unit It will be obvious.

The control unit 404 generates control information for adjusting the position of each tuning bolt. For example, when there are three tuning bolts on one filtering line, such as the diplexer shown in Fig. 2, the control unit 304 generates control information for adjusting the insertion depth of each tuning bolt.

Since the insertion depth of the tuning bolt is adjusted by rotation, the control information of the control unit 404 is preferably rotation angle information of each tuning bolt. In addition, the control unit 404 may provide tuning sequence information for a plurality of tuning bolts.

The tuning drive unit 406 rotates the tuning bolt according to the tuning control information provided from the control unit 404 to perform tuning on the tuning target device. The tuning drive unit 406 receives the rotation angle information for each tuning bolt from the control unit 404 and rotates the tuning bolt according to the received control information to adjust the insertion depth of the tuning bolt of the tuning target device.

The filter parameters that are changed according to the tuning of the tuning drive unit 406 are monitored by the control unit 404 and when the difference between the measured filter parameter and the filter parameter of the model device is below a predetermined threshold value, It is determined that it is completed and tuning is stopped.

5 is a block diagram showing a configuration of a control unit of an automatic tuning device used for automatic tuning of the RF cavity device of the present invention.

5, the control unit may include a reference parameter storage unit 500, a comparison unit 502, a tuning control information generation unit 504, a tuning sequence information generation unit 506, and a mapping table 508 have.

The reference parameter storage unit 500 stores filter parameters of the tuning-completed model device. As described above, the filter parameters may include a resonant frequency and a coupling value.

The comparison unit 502 compares the parameter of the target filtering line provided from the parameter extraction unit 402 with the reference parameter stored in the reference parameter storage unit 500. The comparison unit 502 calculates a difference value between the reference parameter and the target filtering line parameter, and the calculated difference value is stored in the tuning control information generation unit 504 and the tuning order information generation unit 506, And is used to generate information.

The tuning control information generating unit 504 and the tuning sequence information generating unit 506 generate tuning control information and tuning sequence information using the difference value calculated from the comparing unit 502 and the information of the mapping table 508. [ In the mapping table, frequency information and coupling value information, which are changed according to the rotation of each tuning bolt, are recorded.

The tuning control information generating unit 504 generates control information for adjusting the insertion depth of each tuning bolt based on the mapping table and difference value information according to an automatic tuning algorithm. Preferably, the control information for adjusting the insertion depth is rotation angle information of each tuning bolt.

As described above, the tuning bolt located at the upper portion of the resonator is a tuning bolt for adjusting the resonance frequency, and the tuning bolt positioned corresponding to the coupling window is a tuning bolt for adjusting the coupling value. Calculates the rotation angle information of each tuning bolt based on the automatic tuning algorithm. Of course, the rotation angle information includes information on whether the rotation angle is for rotating the tuning bolt upward or rotation angle information for moving down.

The tuning sequence information generator 506 generates information on which tuning bolt is to be adjusted first among a plurality of tuning bolts whose insertion depths need to be adjusted. It is preferable that the tuning sequence information generating unit 506 sets the tuning sequence so that the position adjustment for the tuning bolts having a large influence on the tuning is performed first and the tuning sequence can be set based on the automatic tuning algorithm to be used.

When the automatic tuning operation of the specific filtering line (e.g., the first filtering line) is completed by the automatic tuning unit shown in Fig. 5, the automatic tuning operation of the other filtering line (e.g., the second filtering line) To perform an overall tuning of the RF cavity device having a plurality of filtering lines. During the tuning of the second filtering line, the first resonator of the first filtering line is shorted and then the tuning operation is performed.

6 is a cross-sectional view of a first cavity connected to an input port in an RF cavity device according to an embodiment of the present invention, and is a cross-sectional view of a structure before shorting a short pin for automatic tuning to a resonator.

As described above, the RF cavity device of the present invention has a plurality of filtering lines, and the first cavity means the first cavity of each filtering line.

6, an RF cavity device according to an embodiment of the present invention includes a cover 600, a housing 610, a cavity 620, a resonator 630, a tuning bolt 640, and a short pin 650 And additionally includes a short pin 650 as compared to a conventional RF cavity device.

The cover 600 is made of a metal material and shields the upper portion of the RF cavity device. The cover 600 is coupled with the housing 610 to implement the overall shielding structure of the RF cavity device. The cover 600 may be coupled to the housing 610 using various coupling methods such as bolting, soldering, and the like.

The cavity 620 space is defined by the partitions formed in the housing 610 and the housing 610. A resonator 630 is accommodated in each cavity 620. The resonator 630 is generally coupled to the bottom of the cavity 620 and has a cylindrical or disk shape. The filtering frequency of the cavity device can be determined by the size and shape of the resonator 620.

The tuning bolt 640 is inserted into the cavity 620 through the cover 600. The tuning bolt 640 is inserted into the cavity 620 to finely tune the resonance frequency of the RF cavity device. The tuning bolt 640 is made of a metal material and the resonance frequency is determined by the distance from the resonator 620.

According to an embodiment of the present invention, a short pin 650 is inserted into the cavity 620. The short pin 650 is a component for electrically shorting the resonator 630 inside the cavity 620 during automatic tuning. The short pins 650 are inserted into the cavity 620 through the cover 600.

As shown in FIG. 6, the short pin 650 does not contact the resonator 630 in a steady state and contacts the resonator 630 to deactivate the operation of a particular filtering line during the automatic tuning process.

The short pin 650 moves inside the cavity 620 to change the contact / non-contact state with the resonator 630.

The cover 600 is formed with a hole for inserting and moving the short pin 650 into the cavity 620.

7 is a view showing a shape of a hole formed in a cover for moving a short pin in an RF cavity device according to an embodiment of the present invention.

7, the holes formed in the cover include a first hole 700, a second hole 710 having a smaller diameter than the first hole 700, a first hole 700 and a second hole 710 (Not shown).

In a steady state, the short pin 650 is inserted into the cavity through the first hole 700 and is not in electrical contact with the resonator 620 when inserted through the first hole 700.

The sliding hole 720 is a hole for moving the short pin 650 and is changed to a structure in which the short pin 650 is moved through the sliding hole 720 and inserted into the cavity through the second hole 710 .

When the short pin 650 is inserted into the cavity through the second hole 710, the short pin 650 makes electrical contact with the resonator 630 to short the resonator.

8 is a view showing an operation in which a short pin moves and contacts a resonator according to an embodiment of the present invention.

Before describing the operation of Fig. 8, the structure of the short pins shown in Figs. 6 and 8 will be described first.

6 and 8, the short pins 650 include a pressing member 800, an elastic member 810, a fixing member 820, and a contact member 830.

The pressing member 800 is an element for pressing the elastic member 810, and the pressing member 800 and the elastic member 810 are connected. The pressing member 800 is operated by the user, and when the user presses the pressing member 800, the elastic member 810 is contracted.

The elastic member 810 may be, for example, a spring, and various elements having elasticity may be used.

The fixing member 820 is located under the elastic member 810 and functions as a housing together with the pressing member 800. [ The fixing member 820 is in contact with the cover.

A part of the contact member 830 is inserted into the pressing member 800 and the fixing member 820. The contact member 830 is made of a metal material and includes a first diameter portion 832 having a first diameter, a second diameter portion 834 having a second diameter, and a tapered portion 836.

The first diameter portion 832 has a cylindrical shape, and the diameter of the first diameter portion 832 corresponds to the diameter of the first hole 700. The second diameter portion 835 has a cylindrical shape and the diameter of the second diameter portion 836 corresponds to the diameter of the second hole 700.

The tapered portion 836 is located between the first diameter portion 832 and the second diameter portion 834 and is located between the first diameter portion 832 and the second diameter portion 834, to be. The diameter of the tapered portion 836 gradually decreases toward the upper side.

Referring to FIG. 6, in a steady state, the contact member 830 is inserted into the cavity through the first hole 700. The contact member 830 inserted through the first hole 700 does not contact the resonator 630 because the first hole 700 is located farther away from the resonator than the second hole 710

8A, in order to move the short pin 650, the pressing member 800 is first pressed. When the pressing member 800 is pressed, the elastic member 810 contracts, so that the contact member 830 is lowered.

Due to the lowering of the contact member 830, all of the first diameter portion 832 and a portion of the second diameter portion 834 are inserted into the cavity. Referring to FIG. 8B, after the contact member 830 is lowered, the short pins 650 are moved to be inserted through the second holes 710 using the sliding holes 720. At this time, the short pin 650 is moved from the first hole 700 to the second hole 710 through the sliding hole 720 while the pressing member 800 is being pressed.

When the pressing member 800 is placed after the movement is completed, the pressing member 800 rises due to the restoring force of the elastic member 810. However, since the diameter of the second hole 710 corresponds to the diameter of the second diameter portion 834, the first diameter portion 832 is caught by the second hole 710, .

The second hole 710 is formed at a position where the first diameter portion 832 of the contact member 830 can contact the resonator 630 when the contact member 830 is inserted through the second hole 710. Thus, when the short pin 650 moves into the second hole 710, the first diameter portion 832 of the contact member 830 is in electrical contact with the resonator 630 through which the resonator 630 is electrically Shot.

FIG. 9 is a cross-sectional view of a first cavity connected to an input port in an RF cavity device according to another embodiment of the present invention, and is a cross-sectional view of a structure before a short pin for automatic tuning is short-circuited to a resonator.

10 is a view illustrating an operation in which a short pin of a RF cavity device moves and contacts with a resonator according to another embodiment of the present invention.

9 and 19, an RF cavity device according to an embodiment of the present invention includes a cover 900, a housing 910, a cavity 920, a resonator 930, a tuning bolt 940, and a short pin 950).

The RF cavity device of the other embodiment shown in Fig. 9 is different only in the shape of the short pin, and the other structure is the same as that of the RF cavity device shown in Figs.

The structure of the holes formed in the cover in the RF cavity device according to another embodiment of the present invention is the same as that shown in Fig.

9 and 10, the short pin 950 includes a contact member 1000 and a nut 1010. The contact member 1000 includes a first diameter portion 1100 and a second diameter portion 1200.

The diameter of the first diameter portion 1100 corresponds to the first hole 700 and the diameter of the second diameter portion 1200 corresponds to the second hole 710.

Referring to FIG. 9, in a steady state, the second diameter portion 1200 is inserted into the cavity through the first hole 700. At this time, the contact member 1000 is fixed by the nut 1010.

10, when the short pin 650 is to be moved, the nut 1010 is released to release the contact member 1000 and the insertion depth of the second diameter portion 1200 is adjusted to be inserted into the cavity The contact member 1000 is moved from the first hole 700 to the second hole 710 through the sliding hole 720.

The second hole 710 is formed at a position where the first diameter portion 1100 of the contact member 1000 can contact the resonator 630 when the contact member 1000 is inserted through the second hole 710. Thus, when the contact member 1000 moves into the second hole 710, the first diameter portion 1100 of the contact member 1000 is in electrical contact with the resonator 630 through which the resonator 630 is electrically Shot.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (12)

housing;
A plurality of cavities formed in the housing;
A resonator accommodated in each of the plurality of cavities;
And a cover coupled to the upper portion of the housing,
The first cavities being coupled to the input port in each of the plurality of filtering lines are electrically connected to one of the resonators housed in the first cavities in a first state, And short pins electrically shorted with one of the resonators received in the first cavities in a second state are inserted through the cover. The method according to claim 1,
Wherein the cover has a first hole at a predetermined position corresponding to the first cavities, a sliding hole connected to the first hole, and a second hole connected to the sliding hole, A pin is inserted through the first hole, and in the second state, the short pin is inserted through the second hole. The method according to claim 1,
Wherein the short pin is a contact member which is in electrical contact with at least one of an elastic member, a pressing member for pressing the elastic member, and a resonator accommodated in the first cavities in the second state in response to the pressing of the pressing member, And the RF cavity device. The method of claim 3,
Wherein when the first resonators are short-circuited, the short pin is moved from the first hole to the second hole through the sliding hole. 5. The method of claim 4,
Wherein the contact member has a cylindrical shape and includes a first diameter portion having a first diameter and a second diameter portion having a second diameter that is relatively smaller than the first diameter, And wherein at least a portion of the second diameter is inserted into the first cavities when the pressing member is pressed. 6. The method of claim 5,
And the short pin is moved to the second hole through the sliding hole while the pressing member is being pressed. 6. The method of claim 5,
Wherein the contact member further comprises a tapered portion formed between the first diameter portion and the second diameter portion, the diameter of which gradually changes. 3. The method of claim 2,
Wherein the short pin includes a contact member and a nut for fixing the contact member. 9. The method of claim 8,
Wherein the contact member is cylindrical in shape and includes a first diameter portion having a first diameter and a second diameter portion having a second diameter that is a relatively small diameter relative to the first diameter. 10. The method of claim 9,
The contact member moves from the first hole to the second hole through the sliding hole while at least a part of the second diameter portion is inserted into the cavity, and after the second hole is moved to the second hole, And is in contact with one of the resonators received in the cavities. A plurality of filtering lines including a plurality of cavities;
A cover coupled to an upper portion of the plurality of cavities;
A resonator accommodated in each of the plurality of cavities;
And a short pin inserted through the cover into the first cavities of each of the plurality of filtering lines and controlling the shorting and release of the resonators received in the first cavities. 12. The method of claim 11,
Wherein the short pin is electrically shorted to one of the resonators housed in the first cavities in a first state and electrically spaced from one of the resonators housed in the first cavities in a second state.

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