KR20100102378A - Screw rod holder for tuning rf-filter - Google Patents

Screw rod holder for tuning rf-filter Download PDF

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Publication number
KR20100102378A
KR20100102378A KR1020090020724A KR20090020724A KR20100102378A KR 20100102378 A KR20100102378 A KR 20100102378A KR 1020090020724 A KR1020090020724 A KR 1020090020724A KR 20090020724 A KR20090020724 A KR 20090020724A KR 20100102378 A KR20100102378 A KR 20100102378A
Authority
KR
South Korea
Prior art keywords
screw rod
nut
cover plate
filter
tuning
Prior art date
Application number
KR1020090020724A
Other languages
Korean (ko)
Inventor
구윤섭
Original Assignee
주식회사 신아정밀
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 신아정밀 filed Critical 주식회사 신아정밀
Priority to KR1020090020724A priority Critical patent/KR20100102378A/en
Publication of KR20100102378A publication Critical patent/KR20100102378A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/207—Hollow waveguide filters
    • H01P1/209—Hollow waveguide filters comprising one or more branching arms or cavities wholly outside the main waveguide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators

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  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The present invention relates to a screw rod for RF filter tuning. It is a box-shaped housing; A cover plate fixed to the upper portion of the housing; A lower nut part mounted on an RF filter including a screw rod mounted on the cover plate to maintain the position of the screw rod, wherein a female thread is formed on an inner circumferential surface thereof and passes the screw rod; An upper nut part positioned on an upper part of the lower nut part and having an internal thread formed on the inner circumferential surface of the lower nut part having the same size as that of the female thread part, and inclined with respect to the upper surface of the cover plate; It has a configuration including an elastic tightening nut consisting of a connecting portion for connecting the lower nut portion and the upper nut.

The present invention has been made to solve the above problems, and since the screw rod is continuously supported without being separated from the cover plate for tuning, the axial rotation of the screw rod is easy and workability is particularly good, and the tuning is precisely implemented. The aim is to provide a screw rod holder for RF filter tuning that increases reliability.

Description

Screw rod holder for tuning RF-filter}

The present invention relates to a screw rod holder for RF filter tuning.

RF filter plays a role of passing only the frequency of the desired band among the input frequency components and attenuating the rest. The pass frequency band of the RF filter is determined by the inductance and capacitance inherent in the filter.

Meanwhile, tuning of the RF filter is performed to adjust the band of the frequency passed by the RF filter as necessary. Tuning of the RF filter includes a process of moving the screw rod 23 shown in FIG. 1 up and down.

1 is a perspective view showing a conventional RF filter.

As shown, the conventional RF filter 11 has a housing 13 open to the top and having a plurality of cavities (13a in FIG. 2A) therein, and mounted on top of the housing 13 to provide a housing 13. ) And a cover plate 19 having a female screw hole 19a at a point corresponding to the vertical upper portion of the cavity 13a, and screwed into the female screw hole 19a, the lower end of the cavity 13a being A plurality of screw rods 23 extending inwardly, and a fixing nut 25 coupled to the screw rod 23 and in close contact with the upper surface of the cover plate 19 to fix the screw rod 23.

In addition, the input connector 15 and the output connector 17 are located side by side on one side of the housing (13). The input / output connectors 15 and 17 are connected to a circuit provided in the housing 13. The input connector 15 is a terminal for inputting an RF signal, and the output connector 17 is a terminal for outputting a signal after being filtered by a filter among the signals input through the input connector 15.

On the other hand, in the RF filter 11 having the above configuration in order to tune the frequency input through the input connector 15, the position of the screw rod 23 should be adjusted. That is, the screw rod 23 is axially rotated in the arrow a direction or the opposite direction to adjust the distance of the lower end of the screw rod 23 with respect to the electrode 13b provided in the cavity 13a. Reference numeral 23a denotes a groove to which the end of the hand tool A for axially rotating the screw rod 23 is caught.

2A to 2D are diagrams for describing a tuning process of the RF filter illustrated in FIG. 1.

Referring to FIG. 2A, a cavity 13a is provided inside the housing 13, and an electrode 13b is provided on an inner bottom of the cavity 13a. The cavity 13a is a cylindrical space portion opened upwardly, and a plurality of the cavities 13a are disposed inside the housing 13.

In addition, the screw rod 23 penetrates the cover plate 19, and a lower end thereof is located in the cavity 13a. The distance between the screw rod 23 and the electrode 13b is adjusted by rotating the screw rod 23. A capacitance is formed between the electrode 13b and the screw rod 23. The capacitance is varied according to the distance between the electrode and the screw rod 23. The narrower the gap between the electrode and the screw rod 23, the higher the capacitance value.

Since the screw rod 23 penetrates the female screw hole 19a of the cover plate 19 and is screwed into the female screw hole 19a, the screw rod 23 is turned to the left and right as if the screw is turned by using a hand tool A. FIG. Rotation depth of the screw rod 23 can be adjusted. That is, the capacitance inside the cavity 13a can be adjusted.

In any case, in the conventional RF filter 11 having the above structure, in order to axially rotate the screw rod 23, the fixing nut 25 is first unscrewed and the fixing nut 25 is removed as shown in FIG. 2B. 19). Once the fixing nut 25 is separated from the cover plate 19, the screw rod 23 can be rotated.

If the fixing nut 25 is spaced apart from the cover plate 19, the screw rod 23 is axially rotated in the desired direction using a hand tool (A). In the case of FIG. 2C, the screw rod 23 moves in the direction of the arrow z to approach the electrode 13b.

If the position of the screw rod 23 is finally determined through the above process, the fixing nut 25 is moved to the cover plate 19 to be removed. When the fixing nut 25 is tightened while the fixing nut 25 is in contact with the cover plate 19 as shown in FIG. 2D, the fixing of the screw rod 23 to the cover plate 19 is completed.

By the way, the conventional RF filter 11 has a disadvantage in that the process of tuning the frequency is inconvenient and in particular it is not possible to perform accurate tuning. As described above, in order to adjust the position of the screw rod 23 in the conventional RF filter 11, first loosen the fixing nut 25 and the position of the screw rod 23 is adjusted and then the fixing Since the nut 25 needs to be tightened again, the work process is cumbersome, and the tool for loosening or tightening the fixing nut 25 must be carried.

In addition, when the screw nut 23 is finally tightened in the state where the screw rod 23 is set, the screw rod 23 easily rotates together with the fixing nut 25. No matter how precisely the position of the screw rod 23 is set, when the screw rod 23 is rotated in the last process, the setting must be made again from the beginning. In order to solve this problem, the hand nut A is inserted into the groove 23a of the screw rod 23 when the fixing nut 25 is finally removed, but the screw rod 23 does not turn along, but the reliability is very low. It's just an unsolvable measure.

The present invention has been made to solve the above problems, and since the screw rod is continuously supported without being separated from the cover plate for tuning, the axial rotation of the screw rod is easy and workability is particularly good, and the tuning is precisely implemented. The aim is to provide a screw rod holder for RF filter tuning that increases reliability.

RF filter tuning screw rod holder of the present invention for achieving the above object, the box-shaped housing having a plurality of cavities open to the top; A plate member fixed to an upper portion of the housing to seal the housing, the cover plate having a through hole formed at a point corresponding to the vertical upper portion of each cavity; A screw for the cavity is mounted to the RF filter including a screw rod which can be elevated in the vertical direction of the cover plate and a male thread is formed on the outer circumferential surface of the cover plate, with a part of which is inserted into the cavity through each through hole of the cover plate. A lower nut portion fixed to an upper portion of the cover plate and having a female screw thread coupled to a male thread of the screw rod on an inner circumferential surface thereof to pass the screw rod; An upper nut part positioned on an upper part of the lower nut part and having an internal thread formed on the inner circumferential surface of the lower nut part having the same size as that of the female thread part, and inclined with respect to the upper surface of the cover plate; It characterized in that it comprises an elastic tightening nut consisting of a connecting portion for connecting the lower nut portion and the upper nut portion.

In addition, the through hole of the cover plate is a female screw hole in which a female thread is formed, and a male screw part is formed integrally at the lower portion of the elastic tightening nut by screwing into the female screw hole of the cover plate to fix the elastic tightening nut to the cover plate. It is characterized by being.

In addition, the elastic tightening nut; Forming a slit in the direction orthogonal to the longitudinal direction of the screw rod on the side of the hexagon nut to divide the upper nut portion and the lower nut portion around the slit, and to take the form of plastic deformation by pressing the upper nut portion to the lower nut portion side. It is done.

In addition, the slit is characterized in that two are formed symmetrically on both sides of the hexagon nut.

The screw rod holder for RF filter tuning of the present invention made as described above, the screw rod is continuously supported without being separated from the cover plate for tuning, the shaft rotation of the screw rod is easy and workability is good, especially tuning is precisely implemented. Therefore, it has the effect of increasing the reliability of the RF filter.

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

3 is a perspective view of an RF filter 31 to which a screw rod holder for tuning an RF filter is applied according to an embodiment of the present invention.

The same reference numerals as the above reference numerals denote the same members having the same function.

As shown in the drawing, the screw rod 23 is fixed by the holder 33 in a state of passing through the cover plate 19. The holder 33 is screwed into the female screw hole 19a of the cover plate 19, unlike the conventional fixing nut (22 in FIG. 1). To this end, the holder 33 is integrally provided with a male screw part 33d. The male screw portion 33d is a portion engaged with the female screw hole 19a of the cover plate 19a.

The holder 33 has a form in which horizontal slits 33a are processed on both sides of the hexagon nut. The upper nut part 33f is positioned above the slit 33a with the slit 33a interposed therebetween, and the lower nut part 33g is positioned below the slit 33a. The upper nut part 33f and the lower nut part 33g form an elastic tightening nut 33m. As will be described later, the elastic tightening nut 33m has a self-locking performance to elastically fix the screw rod 23 accommodated therein.

Further, the specifications of the female thread formed on the inner circumferential surfaces of the upper nut portion 33f and the lower nut portion 33g are the same.

In addition, a female screw hole 33c is formed in the center of the holder 33 to allow the screw rod 23 to pass therethrough. It goes without saying that a female thread is formed on the inner circumferential surface of the female screw hole 33c.

In any case, the screw rod 23 has a basic structure for screwing the holder 33 to the female screw hole 19a while being coupled to the female screw hole 33c of the holder 33. The screw rod 23 is coupled to the holder 33, not fixed to the female screw hole 19a.

The screw rod 23 having such an installation structure is axially rotated left and right through the hand tool A to adjust its position. The conventional fixing nut 25 should be separated from the cover plate 19 to adjust the position of the screw rod 23, but the holder 33 of the present embodiment remains fixed to the cover plate 19. do. That is, the screw rod 23 can be axially rotated with the hand tool A from the beginning without having to remove the holder 33 from the cover plate 19.

4 is a perspective view illustrating the structure of the holder shown in FIG. 3, and FIG. 5 is a side cross-sectional view of the holder shown in FIG.

As shown, the holder 33 according to the present embodiment is composed of a resilient tightening nut 33m taking the form of a hexagon nut and a male screw part 33d integrally formed under the resilient tightening nut 33m. . In addition, a female screw hole 33c is formed in the central shaft portion of the elastic tightening nut 33m and the male screw portion 33d.

The resilient tightening nut 33m is spaced apart from the lower nut part 33g by a lower nut part 33g and a slit 33a, and an upper nut part 33 located above the lower nut part 33g. 33f) and a connecting portion 33p for integrally connecting the lower nut portion 33g and the upper nut portion 33f. The slit 33a is symmetrical with the connecting portion 33p therebetween.

Reference numeral 33b denotes a through hole. The through hole 33b prevents cracks from occurring in the connection part 33p.

Further, the upper nut part 33f is inclined downward by an angle θ with the connection part 33p interposed therebetween by being pressed in the direction of arrow F and plastically deformed. The reason why the upper nut part 33f is deformed to be inclined as described above is that the elastic tightening nut 33m has a self-locking property. The inclination angle is preferably about 1 to 15 degrees.

6 is a view illustrating the principle of self-locking of the holder shown in FIG.

As shown in the drawing, the male screw portion 33d of the holder 33 is screwed into the female screw hole 19a of the cover plate 19. In addition, the screw rod 23 penetrates the female screw hole 33c of the holder 33, and a lower end thereof is inserted into the cavity 13a.

In particular, since the upper nut portion 33f is inclined downward as described above, the female thread 33s inside the upper nut portion 33f is pressed by the male thread 23b of the screw rod 23 in the arrow P direction. do. This is because the pitch of the male thread 23b of the screw rod 23 is constant, whereas the female thread 33s of the upper nut portion 33f (because the upper nut portion 33f is inclined downward) in the arrow R direction. This is because it is located at the point of rotation.

 Since the upper nut portion 33f has a property of maintaining the inclined state, the pressing force in the arrow P direction acts as a reaction force, so that the female thread 33s is the male thread 23b of the screw rod 23. Press in the direction of arrow R. As a result, the axial rotation of the screw rod 23 is constrained by the adhesion between the female screw thread 33s and the male screw thread 23b.

Therefore, the screw rod 23 is axially rotated as it is supported by the holder 33 without the holder 33 being removed from the cover plate 19 to insert the screw rod 23 into the cavity 13b. You can adjust the depth.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

1 is a perspective view showing a conventional RF filter.

2A to 2D are diagrams for describing a tuning process of the RF filter illustrated in FIG. 1.

3 is a perspective view of an RF filter to which a screw rod holder for tuning an RF filter is applied according to an embodiment of the present invention.

4 is a perspective view illustrating the structure of the holder illustrated in FIG. 3.

FIG. 5 is a side sectional view of the holder shown in FIG. 3. FIG.

6 is a view illustrating the principle of self-locking of the holder shown in FIG.

<Explanation of symbols for main parts of the drawings>

11: RF filter 13: Housing 13a: Cavity

13b: electrode 15: input connector 17: output connector

19: Cover plate 19a: Female thread hole 23: Screw rod

23a: Groove 23b: Male thread 25: Locking nut

31: RF filter 33: holder 33a: slit

33b: Through hole 33c: Female thread hole 33d: Male thread portion

33f: Upper nut 33g: Lower nut 33m: Resilient tightening nut

33p: Connection 33s: Female thread

Claims (4)

A box-shaped housing having a plurality of cavities opened upwardly; A plate member fixed to an upper portion of the housing to seal the housing, the cover plate having a through hole formed at a point corresponding to the vertical upper portion of each cavity; A screw for the cavity is mounted to the RF filter including a screw rod which can be elevated in the vertical direction of the cover plate and a male thread is formed on the outer circumferential surface of the cover plate, with a part of which is inserted into the cavity through each through hole of the cover plate. To maintain the relative position of the rod, A lower nut portion fixed to an upper portion of the cover plate and having an internal thread formed on an inner circumferential surface thereof to engage the male thread of the screw rod and passing through the screw rod; An upper nut part positioned on an upper part of the lower nut part and having an internal thread formed on the inner circumferential surface of the lower nut part having the same size as that of the female thread part, and inclined with respect to the upper surface of the cover plate; RF filter tuning screw rod holder including an elastic tightening nut consisting of a connecting portion connecting the lower nut and the upper nut. The method of claim 1, The through hole of the cover plate is a female screw hole in which a female thread is formed. The lower portion of the elastic tightening nut is screwed to the female screw hole of the cover plate, the male screw portion for fixing the elastic tightening nut to the cover plate, characterized in that the RF filter tuning screw rod holder. The method according to claim 1 or 2, The elastic tightening nut is; Forming a slit in the direction orthogonal to the longitudinal direction of the screw rod on the side of the hexagon nut to divide the upper nut portion and the lower nut portion around the slit, and to take the form of plastic deformation by pressing the upper nut portion to the lower nut portion side. Screw rod holder for RF filter tuning. The method of claim 3, wherein The slit is a screw rod holder for RF filter tuning, characterized in that two are formed symmetrically on both sides of the hexagon nut.
KR1020090020724A 2009-03-11 2009-03-11 Screw rod holder for tuning rf-filter KR20100102378A (en)

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Application Number Priority Date Filing Date Title
KR1020090020724A KR20100102378A (en) 2009-03-11 2009-03-11 Screw rod holder for tuning rf-filter

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Application Number Priority Date Filing Date Title
KR1020090020724A KR20100102378A (en) 2009-03-11 2009-03-11 Screw rod holder for tuning rf-filter

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102255124A (en) * 2011-04-22 2011-11-23 深圳市大富科技股份有限公司 Cavity filter, communication equipment, communication equipment cover plate component and tuning structure
KR101252595B1 (en) * 2011-10-07 2013-04-10 주식회사 이롬테크 Tuning apparatus in radio frequency filter with cavity structure
CN103715489A (en) * 2013-12-30 2014-04-09 苏州市大富通信技术有限公司 Assembly device and method of filter cover plate and debugging threaded rod assembly
WO2018203655A1 (en) * 2017-05-02 2018-11-08 주식회사 케이엠더블유 Cavity-type radio frequency filter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102255124A (en) * 2011-04-22 2011-11-23 深圳市大富科技股份有限公司 Cavity filter, communication equipment, communication equipment cover plate component and tuning structure
KR101252595B1 (en) * 2011-10-07 2013-04-10 주식회사 이롬테크 Tuning apparatus in radio frequency filter with cavity structure
CN103715489A (en) * 2013-12-30 2014-04-09 苏州市大富通信技术有限公司 Assembly device and method of filter cover plate and debugging threaded rod assembly
WO2018203655A1 (en) * 2017-05-02 2018-11-08 주식회사 케이엠더블유 Cavity-type radio frequency filter
KR20190139850A (en) * 2017-05-02 2019-12-18 주식회사 케이엠더블유 Cavity Type Radio Frequency Filter
EP3621145A4 (en) * 2017-05-02 2021-01-06 KMW Inc. Cavity-type radio frequency filter
US11108121B2 (en) 2017-05-02 2021-08-31 Kmw Inc. Cavity-type radio frequency filter

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