KR20100102379A - Rf-filter tuning device - Google Patents

Rf-filter tuning device Download PDF

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Publication number
KR20100102379A
KR20100102379A KR1020090020725A KR20090020725A KR20100102379A KR 20100102379 A KR20100102379 A KR 20100102379A KR 1020090020725 A KR1020090020725 A KR 1020090020725A KR 20090020725 A KR20090020725 A KR 20090020725A KR 20100102379 A KR20100102379 A KR 20100102379A
Authority
KR
South Korea
Prior art keywords
screw rod
filter
female
male thread
screw
Prior art date
Application number
KR1020090020725A
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 KR1020090020725A priority Critical patent/KR20100102379A/en
Publication of KR20100102379A publication Critical patent/KR20100102379A/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/06—Cavity resonators
    • 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

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

Abstract

The present invention relates to an RF filter tuning device. It comprises a box-shaped housing having a plurality of cavities open to the upper side and having an input connector and an output connector at its sides; A plate-like member fixed to an upper portion of the housing to seal the housing, the signal being provided in an RF filter including a cover plate having a female screw hole formed at a point corresponding to the vertical upper portion of each cavity and outputted through the output connector; By tuning, take the form of a rod extending in the longitudinal direction, the male thread is formed on the outer circumferential surface to be screwed into the female threaded hole, the male thread is formed by compressing the acid of the male thread to plastic deformation It is characterized in that a projection is formed in contact with the bone of the female thread when engaged with the female screw hole.

The RF filter tuning device of the present invention made as described above, the adjustment of the screw rod for tuning is very simple, good workability, in particular, the tuning can be implemented precisely can increase the reliability of the RF filter.

Description

RF filter tuning device

The present invention relates to an RF filter tuning device.

RF filter is to pass only the frequency of the desired band among the input frequency components and to attenuate the rest of the frequency signal, a variety of types and forms have been developed. The pass frequency band of the RF filter is determined by the inductance and capacitance inherent in the filter.

On the other hand, tuning of the RF filter is performed to adjust the band of the frequency passed by the RF filter to meet the needs. Tuning of the RF filter includes a process of moving the screw rod 24 shown in FIG. 1 up and down.

1 is a perspective view schematically showing a conventional RF filter 12.

As shown, the conventional RF filter 12 has a housing 14 that is open to the top and has a plurality of cylindrical cavities (14a in FIG. 2A) therein, and is mounted on top of the housing 14 to provide a housing ( 14) and cover plate 20 having a female threaded hole 20a at a point corresponding to the vertical upper portion of the cavity 14a, and screwed into the female threaded hole 20a, the lower end of which is the cavity 14a. A plurality of screw rods 24 inserted into the inside and a fixing nut for fixing the screw rods 24 in close contact with the upper surface of the cover plate 20 while passing the screw rods 24 therein. 26).

The screw rod 24 is screwed to the female screw hole 20a and the fixing nut 26 at the same time. Therefore, when the screw rod 24 is restrained from being axially rotated and the fixing nut 26 is tightened, the screw rod 24 is coupled to the cover plate 20.

The input connector 16 and the output connector 18 are located side by side on one side of the housing 14. The input / output connectors 16 and 18 are connected to a circuit board (not shown) provided in the housing 14. The input connector 16 is a terminal for inputting an RF signal, and the output connector 18 is a terminal for outputting a signal after filtering by a filter among the signals input through the input connector 15.

On the other hand, in the RF filter 12 having the above configuration in order to tune the frequency input through the input connector 16, the position of the screw rod 24 should be adjusted. That is, the screw rod 24 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 (14b of FIG. 2A) provided in the cavity 14a.

Reference numeral 24a 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 explaining a tuning process of the RF filter 12 shown in FIG.

As shown in Fig. 2A, a cavity 14a is provided inside the housing 14, and an electrode 14b is provided on the inner bottom of the cavity 14a. The cavity 14a is arranged in the housing 14 as a cylindrical space part opened upwardly.

In addition, the screw rod 24 penetrates the cover plate 20 so that the lower end thereof is located in the cavity 14a. The distance between the screw rod 24 and the electrode 14b is adjusted by axially rotating the screw rod 24. Capacitance is formed between the electrode 14b and the screw rod 24. The capacitance is varied according to the distance between the electrode 14b and the screw rod 24. The narrower the gap between the electrode 14b and the screw rod 24, the higher the capacitance value.

Since the screw rod 24 passes through the female screw hole 20a of the cover plate 20 and is screwed into the female screw hole 20a, the screw rod 24 (if there is no fixing nut 25) is used as a screw using a hand tool A. By turning the screw rod 24 to the left and right as to turn it can be adjusted the insertion depth of the lower end of the screw rod (24). That is, the capacitance inside the cavity 14a can be adjusted.

In any case, in the conventional RF filter 12 having the above structure, in order to axially rotate the screw rod 24, the fixing nut 26 is first unscrewed and the fixing nut 26 is removed as shown in FIG. 2B. Away from (20). This is because the screw rod 24 can be rotated once the fixing nut 26 is separated from the cover plate 20.

When the fixing nut 26 is sufficiently spaced apart from the cover plate 20, the screw rod 24 is axially rotated in the desired direction using the hand tool A. In the case of FIG. 2C, the screw rod 23 moves in the direction of the arrow k to approach the electrode 14b.

If the position of the screw rod 24 is finally determined through the above process, the fixing nut 26 is lowered to the cover plate 20 side. When the fixing nut 26 is tightened while the fixing nut 26 is in contact with the cover plate 20 as shown in FIG. 2D, the fixing of the screw rod 24 to the cover plate 20 is completed.

By the way, the conventional RF filter 12 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 24 in the conventional RF filter 12, first loosen the fixing nut 26 and the position of the screw rod 24 is adjusted, and then the fixing nut (26) must be tightened again, so the work process is cumbersome, and the fixing nut (26) must be carried with a tool for loosening or tightening.

In addition, when the fixing nut 26 is finally tightened with the position of the screw rod 24 set, the screw rod 24 easily rotates finely together with the fixing nut 26. No matter how precisely the position of the screw rod 24 is set, when the screw rod 24 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 24a of the screw rod 24 when the fixing nut 26 is finally removed, but the screw rod 24 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, the adjustment of the screw rod for tuning is very easy to work well and in particular the tuning can be implemented precisely RF filter tuning device to increase the reliability of the RF filter The purpose is to provide.

RF filter tuning device of the present invention for achieving the above object, the box-shaped housing having a plurality of cavities open to the upper side and the input connector and the output connector is provided; A plate-like member fixed to an upper portion of the housing to seal the housing, the signal being provided in an RF filter including a cover plate having a female screw hole formed at a point corresponding to the vertical upper portion of each cavity and outputted through the output connector; By tuning, take the form of a rod extending in the longitudinal direction, the male thread is formed on the outer circumferential surface to be screwed into the female threaded hole, the male thread is formed by compressing the acid of the male thread to plastic deformation It is characterized in that a projection is formed in contact with the bone of the female thread when engaged with the female screw hole.

In addition, the female screw hole of the cover plate is further provided with a holding nut for screwing into the female screw hole, passing the screw rod therein and engaging the male thread of the screw rod to support the screw rod inside the female screw hole. It features.

The protrusion formed on the screw thread of the screw rod is a protrusion formed by pressing a part of the male thread of the screw rod in the direction of the central axis of the screw rod to form a flat crimping portion.

In addition, the protrusion formed on the screw thread of the screw rod is characterized in that the protrusion formed by pressing the outer peripheral surface of the screw rod to form a notch portion extending in the longitudinal direction of the screw rod on the screw rod.

The RF filter tuning device of the present invention made as described above, the adjustment of the screw rod for tuning is very simple, good workability, in particular, the tuning can be implemented precisely can increase 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 an exploded perspective view illustrating a state in which an RF filter tuning device according to an embodiment of the present invention is applied to an RF filter.

In the following description, the same reference numerals as those mentioned above indicate the same members having the same function.

Referring to FIG. 3, it can be seen that a plurality of screw rods 34 are mounted on the cover plate 20. Unlike the conventional screw rod 24 shown in FIG. 1, the screw rod 34 has a crimping portion 34b formed on an outer circumferential surface thereof, and is engaged with each female screw hole 20a so as to be adjustable in position. Therefore, when the screw rod 34 is rotated through the groove 34a at the top of the screw rod 34, the tuning of the RF filter proceeds immediately.

In particular, due to the pressing portion (34b) formed in the male thread of the screw rod 34, it is possible to maintain a fixed state of the screw rod 34 alone without a separate fixing nut (for example, 26 in FIG. 1). The action of the crimping portion 34b will be described later with reference to FIG. 4.

The crimping portion 34b is a portion in which a part of the male thread is flatly deformed by forcibly pressing the periphery of the round rod-type screw rod 34. As shown in FIG. 4, as shown in FIG. 4, protrusions (34c of FIG. 4) are formed above and below the crimping portion 34b.

The protrusion 34c protrudes from the inclined surface of the thread (that is, the inclined surface connecting the hill and the valley), contacts the inclined surface of the female screw side when engaging with the opposite female screw, and applies the force in the direction of arrow f to rotate the screw rod 34. prevent. For example, the screw rod 34 does not rotate for vibration or other reasons.

In any case, the screw rod 34 itself serves as a tuning device for tuning the RF filter 32. That is, when the end of the hand tool A is inserted into the upper groove 34a of the screw rod 34 and the screw rod 34 is rotated clockwise or vice versa as if the screw is turned with a screwdriver, the screw rod 34 is rotated. It raises and lowers and changes the said capacitance value.

As one method of forming the crimping portion 34b, for example, a screw rod is disposed by placing a screw rod before processing between blocks that are mutually advancing and moving, so that the block is close to deform the thread.

4 is a view for explaining the mounting structure of the tuning device shown in FIG.

As shown in the drawing, the screw rod 34, which is the RF filter tuning device of the present embodiment, is fixed to the female screw hole 20a of the cover plate 20. The screw rod 34 is axially rotated through the hand tool A and moved up and down to adjust the depth to the cavity 14a.

On the other hand, it can be seen that the crimping portion 34b is molded at the tip of the male thread 34d of the screw rod 34. The pressing portion 34b is a portion that is flattened by physically pressing the male thread 34d. As the male screw 34d is pressed and squeezed as described above, protrusions 34c protruding in the direction orthogonal to the spiral direction are naturally generated in the male screw.

The projection 34c exerts a force in the direction of the arrow f on the threads of the female screw hole 20a when engaging the screw rod 34 with the female screw hole 20a. As a result, the screw rod 34 is stiffened by the protrusion 34c so that the set position can be stably maintained without using a separate fixing nut (26 in FIG. 1). Not having to use the fixing nut 26 means that the tuning of the RF filter is as simple as that.

5 is a view showing a state in which the RF filter tuning apparatus according to another embodiment of the present invention is applied to the RF filter, Figure 6 is a cross-sectional view showing the mounting structure of the tuning device shown in FIG.

As shown, the RF filter tuning device according to another embodiment includes a holding nut 42 fixed to the female screw hole 20a, and a lower end portion thereof penetrating the interior of the holding nut 42. It consists of a screw rod 34 extending into the interior. The screw rod 34 is a screw rod described with reference to FIG.

The holding nut 42 is a nut supporting the screw rod 34. For example, the holding nut 42 may be conveniently used when the inner diameter of the female screw hole 20a is larger than the outer diameter of the screw rod 34. In other words, it serves as a so-called adapter for fixing the screw rod 34 to the female screw hole 20a.

The holding nut 42 is to more strongly implement the fixing of the screw rod 34 to the cover plate 20. In fact, since the thickness of the cover plate 20 is almost 5 mm or less, the number of female threads formed inside the female screw hole 20a is small, and the contact area between the female screw hole 20a and the screw rod 34 is so narrow that the protrusion There may be a lack of bearing force that 34c exerts in the direction of arrow f.

The holding nut 42 takes this into consideration. That is, the screw rod 34 is passed through the inside of the cover plate 20 while being fixed and contacted with the screw rod 34 in a larger area, thereby firmly fixing the screw rod 34 to the screw rod 34. For example, even when subjected to the arrow z-direction force of FIG.

The holding nut 42 having this purpose includes a nut part 42b taking the form of a hexagonal nut and a male thread part 42c integrally formed at the lower part of the nut part 42b and having a male thread formed on an outer circumferential surface thereof. Is made of. A female screw hole 42a for passing the screw rod 34 is formed in the nut portion 42b and the male screw portion 42c.

The male screw portion 42c is screwed into the female screw hole 20a provided in the cover plate 20 so that the holding nut 42 supports the screw rod 34 vertically.

In addition, the operation principle of the screw rod 34 projection 34f on the female thread of the female screw hole 42a of the holding nut 42 is the same as that described with reference to FIG. 4.

7 and 8 illustrate another type of screw rod that can be used instead of the screw rod shown in FIG. 4 or FIG. 6.

In the screw rod 34 shown in FIG. 7 and FIG. 8, the notch part 34e is formed instead of the flat crimping part (34b of FIG. 3). The notch 34e is formed through machining as a V-groove extending in the longitudinal direction of the screw rod 34. The machining means the plastic working by pressing, not cutting.

On the other hand, when the male thread of the screw rod 34 (before forming the notch) is pushed in the direction of arrow a to form the notch 34e, V grooves are formed in each male thread and at the same time the inclined surface of the male thread (the male thread) The surface between the hill and the valley) is pushed out in the direction of arrow b to form a projection (34f). The function of the projection 34f is the same as the projection 34c described with reference to FIGS. 4 and 6.

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 an exploded perspective view illustrating a state in which an RF filter tuning device according to an embodiment of the present invention is applied to an RF filter.

4 is a view for explaining the mounting structure of the tuning device shown in FIG.

5 is a view showing a state in which the RF filter tuning apparatus according to another embodiment of the present invention is applied to the RF filter.

6 is a cross-sectional view showing a mounting structure of the tuning device shown in FIG.

7 and 8 illustrate another type of screw rod that can be used instead of the screw rod shown in FIG. 4 or FIG. 6.

<Explanation of symbols for main parts of the drawings>

12: RF filter 14: housing 14a: cavity

14b: Electrode 16: Input Connector 18: Output Connector

20: Cover plate 20a: Female thread hole 24: Screw rod

24a: Groove 26: Locking nut 32: RF filter

34: screw rod 34a: groove 34b: crimping portion

34c: projection 34d: external thread 34e: notch

34f: protrusion 42: holding nut 42a: female thread hole

42b: Nut part 42c: Male thread part

Claims (4)

A box-shaped housing having a plurality of cavities open to the upper side and having an input connector and an output connector at its sides; A plate-like member fixed to an upper portion of the housing to seal the housing, the signal being provided in an RF filter including a cover plate having a female screw hole formed at a point corresponding to the vertical upper portion of each cavity and outputted through the output connector; By tuning Takes the form of a rod extending in the longitudinal direction, the male thread is formed on the outer circumferential surface to be screwed into the female threaded hole, the male thread is formed by pressing and plastic deformation of the acid of the male thread, the female threaded hole RF filter tuning device, characterized in that the projection is formed in contact with the bone of the female thread when the teeth. The method of claim 1, The female screw hole of the cover plate is further provided with a holding nut for screwing into the female screw hole, passing the screw rod therein and engaging the male thread of the screw rod to support the screw rod inside the female screw hole. RF filter tuning device. The method according to claim 1 or 2, The projection formed on the screw thread of the screw rod is a RF filter tuning device, characterized in that the projection formed by pressing a portion of the male thread of the screw rod in the direction of the central axis of the screw rod to form a flat crimping portion. The method according to claim 1 or 2, The projection formed on the screw thread of the screw rod, RF filter tuning apparatus characterized in that the projection formed by pressing the outer peripheral surface of the screw rod to form a notch extending in the longitudinal direction of the screw rod on the screw rod.
KR1020090020725A 2009-03-11 2009-03-11 Rf-filter tuning device KR20100102379A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107443864A (en) * 2017-09-21 2017-12-08 中山市富门木制品有限公司 A kind of processing and forming mould of Novel fire-proof door
KR101864616B1 (en) * 2017-04-24 2018-06-05 주식회사 에이스테크놀로지 Method, tuning rod and jig for auto tunning rf filter
KR101960505B1 (en) * 2017-12-19 2019-03-19 주식회사 에이스테크놀로지 Tunable Cavity Filter For Easy Frequency Tunning Using Snap Dome Switch of Sliding Contact Type
CN110544810A (en) * 2018-05-29 2019-12-06 Mpd股份有限公司 cavity filter with tuning bolt
CN116646702A (en) * 2023-07-25 2023-08-25 安徽曦融兆波科技有限公司 Adjustable short-circuit support joint for resonant cavity of high-power transmitter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101864616B1 (en) * 2017-04-24 2018-06-05 주식회사 에이스테크놀로지 Method, tuning rod and jig for auto tunning rf filter
CN107443864A (en) * 2017-09-21 2017-12-08 中山市富门木制品有限公司 A kind of processing and forming mould of Novel fire-proof door
KR101960505B1 (en) * 2017-12-19 2019-03-19 주식회사 에이스테크놀로지 Tunable Cavity Filter For Easy Frequency Tunning Using Snap Dome Switch of Sliding Contact Type
CN110544810A (en) * 2018-05-29 2019-12-06 Mpd股份有限公司 cavity filter with tuning bolt
CN110544810B (en) * 2018-05-29 2021-12-10 Mpd股份有限公司 Cavity filter with tuning bolt
CN116646702A (en) * 2023-07-25 2023-08-25 安徽曦融兆波科技有限公司 Adjustable short-circuit support joint for resonant cavity of high-power transmitter
CN116646702B (en) * 2023-07-25 2024-01-05 安徽曦融兆波科技有限公司 Adjustable short-circuit support joint for resonant cavity of high-power transmitter

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