KR20170043826A - Compact rf filter using a dielectric resonator - Google Patents

Compact rf filter using a dielectric resonator Download PDF

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Publication number
KR20170043826A
KR20170043826A KR1020150143380A KR20150143380A KR20170043826A KR 20170043826 A KR20170043826 A KR 20170043826A KR 1020150143380 A KR1020150143380 A KR 1020150143380A KR 20150143380 A KR20150143380 A KR 20150143380A KR 20170043826 A KR20170043826 A KR 20170043826A
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South Korea
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cavity
filter
dielectric resonator
resonator
hole
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KR1020150143380A
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Korean (ko)
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KR101766698B1 (en
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천동완
윤재광
박광선
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주식회사 에이스테크놀로지
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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

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Abstract

A compact RF filter using a dielectric resonator is disclosed. According to an aspect of the present invention, there is provided a display device comprising: a housing having a cavity opened to one side; A dielectric resonator inserted into the cavity; And a cover coupled to one side of the housing, wherein the dielectric resonator has a through-hole penetrating from one side to the other along one direction, and a metal layer is formed on one surface and the other surface of the dielectric resonator and on the inner circumferential surface of the through- A small RF filter is provided. According to some embodiments of the present invention, there is provided an RF filter having a higher degree of freedom in application of the filter topology and facilitating the implementation and control of the transmission zero point. The RF filter according to an embodiment of the present invention can be implemented in a small size comparable to that of the conventional ceramic monoblock filter, and has an advantage that it is significantly smaller than the conventional cavity filter.

Description

[0001] COMPACT RF FILTER USING A DIELECTRIC RESONATOR [0002]

The present invention relates to an RF filter, and more particularly to a compact RF filter using a dielectric resonator.

As communication services evolve, there is a demand for an increase in data transmission speed. In order to meet this demand, it is necessary to increase the system bandwidth, improve the reception sensitivity, and minimize the interference caused by other communication system carriers. For this purpose, a low insertion loss high rejection filter Need to provide.

A coaxial resonator fabricated using a metal material is mainly used for filter implementation because it has advantages in terms of loss and cost in comparison with other resonators such as a dielectric resonator. However, as shown in the phenomenon that the use of a small cell is becoming popular, the tendency of the base station system to have a miniaturized size instead of a low output power is increasing, and when using a conventional coaxial resonator, There are limitations in implementing a very small size filter. Therefore, there is a need for a compact resonator capable of reducing the size of the filter.

One example of a typical low power small filter technique is a monoblock filter. 1 is a perspective view conceptually showing a monoblock ceramic filter 10 according to the prior art. The monoblock filter 10 schematically shown in FIG. 1 is formed by forming a plurality of through holes 35 in a main body 30 formed of a ceramic material. A metal layer formed by wet plating or the like is formed on the inner peripheral surface of the through hole 35 and connected to the pattern 50 on the upper surface of the main body 30 to function as a TEM resonator.

Generally, in order to realize a transmission zero in an RF filter, cross coupling should be applied between adjacent resonators, and coupling to other resonators not involved in cross coupling should not be performed. However, since the resonator is implemented through the through hole 35 formed in the single ceramic body 30 of the monoblock filter 10, it is not easy to realize transmission zero because all the resonators are coupled. In order to realize a plurality of transmission zero points, a honeycomb-shaped resonator array is required. However, in the monoblock filter 10, only a single array can be arranged, which imposes a restriction on implementing a plurality of transmission zero points.

The monobloc filter technology can be implemented in a small size, but has a high loss and has a disadvantage in that it is not easy to implement and control the transmission zero because of limitations in the filter topology design due to the structural characteristics that are integrally implemented. In addition, the monoblock filter is formed by a spurious mode due to waveguide mode resonance according to a single body implementation, close to a passband, and this spurious is suppressed by a low-pass filter (LPF) It is a constraint because it is close enough to be hard.

One aspect of the present invention is to provide an RF filter capable of realizing a small size of a monoblock filter level while easily implementing and controlling a transmission zero point by eliminating the restriction of application of a filter topology.

Another aspect of the present invention is to provide an RF filter capable of improving the spurious characteristics to provide a higher RF filter performance and a smaller size of the monoblock filter level.

According to an aspect of the present invention, there is provided a display device comprising: a housing having a cavity opened to one side; A dielectric resonator inserted into the cavity; And a cover coupled to one side of the housing, wherein the dielectric resonator has a through-hole penetrating from one side to the other along one direction, and a metal layer is formed on one surface and the other surface of the dielectric resonator and on the inner circumferential surface of the through- A small RF filter is provided.

The housing may include a plurality of cavities into which the dielectric resonators are each inserted, and the small RF filter further includes a coupling member, wherein both ends of the coupling member are positioned adjacent to the two dielectric resonators, Cross coupling can be generated.

According to an embodiment of the present invention, the housing includes protrusions protruding along the one direction on one surface of the cavity, and the dielectric resonator can be disposed in the cavity so that protrusions are inserted into the through holes. The inner diameter of the through hole can be formed so that the inner diameter at the other side is smaller than the inner diameter at one side and the outer diameter of the through hole at the other side is equal to or smaller than the inner diameter at one side of the through hole, The resonator can be coupled to the protrusion.

The miniature RF filter according to an embodiment of the present invention may further include a tuning member coupled to the cover. The tuning member may be configured such that the distance from the cover is adjustable, and the protruding portion is formed with a receiving space which is opened to one side so that the tuning member is disposed in the receiving space.

When the small RF filter further includes a tuning member coupled to the cover, the tuning member can be configured to be adjustable in distance from the cover, and the tuning member can be located on or in the through hole when the cover is coupled to the housing . According to one embodiment of the present invention, the cover may include a recess portion projecting toward the cavity and having an internal space opened in a direction toward the cavity, and the tuning member may be movably received within the recess portion .

According to another aspect of the present invention, there is provided a dielectric resonator for a compact RF filter including a housing formed with a cavity opened to one side. Wherein the dielectric resonator includes a resonator body made of a ceramic material and having a through hole penetrating from one side to the other side along one direction; And a metal layer formed on one surface and the other surface of the resonator body and on the inner circumferential surface of the through hole.

According to some embodiments of the present invention, there is provided an RF filter having a higher degree of freedom in application of the filter topology and facilitating the implementation and control of the transmission zero point. The RF filter according to an embodiment of the present invention can be implemented in a small size comparable to that of the conventional ceramic monoblock filter, and has an advantage that it is significantly smaller than the conventional cavity filter.

Meanwhile, since the small-sized RF filter according to the embodiment of the present invention does not generate the waveguide mode resonance in each resonator, it is possible to prevent the spurious from being formed close to the pass band as in the conventional ceramic mono-block filter, And a coupling member can be used to adjust the filter characteristics, so that it is possible to provide very high performance even in a small size.

1 is a perspective view conceptually showing a monobloc ceramic filter according to the prior art.
2 is a cross-sectional view of a compact RF filter according to an embodiment of the present invention.
3 is a perspective view conceptually showing only a resonator portion in a small RF filter according to an embodiment of the present invention.
4 and 5 are graphs showing reflection loss and insertion loss when cross coupling is applied to the small RF filter shown in FIG.
6 is a graph showing spurious signals obtained from a monoblock filter according to the prior art.
FIG. 7 is a graph illustrating a spurious response obtained in a small RF filter according to an embodiment of the present invention. Referring to FIG.

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 is to be understood, however, that the invention is not to be limited to the specific 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.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view of a compact RF filter according to an embodiment of the present invention. The RF filter 1000 according to an exemplary embodiment of the present invention includes a housing 100, a cover 200, and a dielectric resonator 300 inserted in a cavity 110 of the housing 100.

At least one of the cavities 110 may be formed in the housing 100. The cavity 110 is open to one side of the housing 100. The housing 100 may be formed of a conductive material, for example, a metal material.

There are various methods for keeping the overall size of the RF filter 1000 small. For example, it is possible to manufacture the housing 100 by thin die casting to form the wall thickness of 1 mm or less. Of course, various methods can be used for manufacturing the housing 100.

The cover 200 is configured to be coupled to an open side of the housing 100. The dielectric resonator 300 is accommodated in the cavity 110 as the cover 200 is coupled to the housing 100. The cover 200 may be formed of a conductive material such as the housing 100, and may be made of a metal or the like.

The dielectric resonator 300 is accommodated in the cavity 110. The dielectric resonator 300 is basically composed of a resonator body 310 and a metal layer 370. The resonator body 310 is formed with a through hole 350 extending from one side to the other along one direction, Are formed on the inner circumferential surface of the through hole 350 and on one surface and the other surface of the resonator body 310. 2 illustrates that the metal layer 370 is formed on the whole of one surface and the other surface of the resonator body 310, that is, the top surface and the bottom surface. However, the metal layer 370 may be formed on only one surface .

The resonator body 310 is basically made of a dielectric material. For example, a ceramic material may be used, and in some embodiments of the present invention, a ceramic material having a dielectric constant as low as about 11 may be used to realize a high Q value. Of course, the material of the resonator body 310 is not limited to ceramics, and various kinds of dielectrics may be used as the material.

The metal layer 370 of the dielectric resonator 300 may be formed by various methods, and metallization processes such as plating, deposition, and sputtering may be applied. The metal layer 370 may be formed of silver (Ag), but is not limited thereto.

The metal layer 370 formed on the inner circumferential surface of the through hole 350 of the dielectric resonator 300 enables resonance like a through hole plated in a mono block filter and a metal layer 370 is formed on one side and the other side of the resonator body 310 So that coupling with adjacent resonators is also possible. Meanwhile, the dielectric resonator 300 according to an embodiment of the present invention can be formed to have a significantly smaller size than the conventional coaxial resonator.

Referring to FIG. 2, protrusions 150 protruding along one direction from one surface of the cavity 110 may be formed in the housing 100. The protrusion 150 may be inserted into the through hole 350 of the dielectric resonator 300 when the dielectric resonator 300 is mounted in the cavity 110 of the housing 100, Position.

In order to securely fix the dielectric resonator 300, the protrusion 150 may be coupled with the coupling part 160. For example, the through-hole 350 of the dielectric resonator 300 may be formed to have a smaller inner diameter at the other side than at one side, and the protrusion 150 may be inserted into the through-hole 350 at the other side formed with a small inner diameter. have.

Here, the fastening part 160 configured to be coupled to the upper side of the protrusion 150 may be inserted into one side opposite to the through hole 350. The coupling part 160 may be coupled to the protrusion 150 so that the dielectric resonator 300 may be inserted into the cavity 110. In this case, It is possible to prevent departure from the predetermined position.

2 shows an example in which a thread is formed on one side of the protrusion 150 and a corresponding female thread is formed on the coupling part 160. Various methods can be used for coupling the coupling part 160 to the protrusion 150 There will be. In addition, although it is shown that the through-hole 350 has a different inner diameter at one side and the other side, the engagement jaw is formed, but the present invention is not limited thereto.

The fastening portion 160 can be made of various materials including plastic as well as metal.

In other embodiments not shown, the dielectric resonator 300 may be secured by other means, such as a stripper bolt. In this case, the protrusion 150 can be omitted.

The RF filter 1000 according to an embodiment of the present invention may further include a tuning member 270 coupled to the cover 200. The tuning member 270 may be coupled to the cover 200 such that the distance from the cover 200 is adjustable.

The tuning member 270 may be configured to position the tuning member 270 on the dielectric resonator 300 or in the through hole 350 of the dielectric resonator 300 when coupling the cover 200 to the housing 100 have. When the tuning member 270 moves on or in the through hole 350, it affects the resonance characteristics of the dielectric resonator 300, and thus the range of the signal to be filtered can be adjusted.

The cover 200 may be formed with a recess 250. The recess portion 250 may protrude in a direction toward the cavity 110 of the housing 100 and may receive the tuning member 270 in the inner space.

In the example shown in Fig. 2, a tuning member 270 is coupled to a bolt 275 rotatably provided on the cover 110. As shown in Fig. That is, the tuning member 270 having the female thread formed on the threaded bolt 275 is threadedly engaged. The bolt 275 may be configured to rotate only with respect to the cover 110 without moving up and down. On the other hand, the tuning member 270 coupled to the bolt 275 can be configured to move in the up and down direction but not to rotate based on the drawing. For example, the outer circumferential surface of the tuning member 270 may have a polygonal cross section rather than a circular cross section, and the inner space of the recess portion 250 receiving the tuning member 270 may correspond to a polygonal cross section The rotation of the tuning member 270 can be prevented.

In this case, when the bolt 275 is rotated by a screwdriver or the like, the bolt 275 rotates while the tuning member 270 does not rotate, so that the bolt 275 acts as a screw shaft, 270 can be moved up and down. In the above example, a groove for a screw driver or the like may be formed on the upper surface of the bolt 275. A groove for the head portion of the bolt 275 may be formed on the upper surface of the cover 200 so that there is no portion protruding from the upper surface of the cover 200.

Of course, a variety of structures may be applied to the configuration in which the tuning member 270 is relatively movable with respect to the cover 200. For example, the tuning member 270 itself may be implemented as a general tundish bolt, a self-locking bolt, or the like.

The tuning member 270 may be formed of a metal or the like to adjust the resonance characteristics of the dielectric resonator 300. The recessed portion 250 can ensure that the tuning member 270 is in the correct position and that the moving direction is also stably aligned.

In the above structure, the tuning member 270 for adjusting the resonance characteristics of the RF filter 1000 may be included, but the tuning member 270 may not protrude from the upper portion of the cover 200. This allows the outer surface of the RF filter 1000 to remain flat and allow the RF filter 1000 to occupy only a small space.

According to an embodiment of the present invention, since the housing 100 is formed of a conductive material and the dielectric resonator 300 is formed of a dielectric material, it is possible to fix the dielectric resonator 300 to the housing 100 by press fitting .

For example, the outer diameter of the dielectric resonator 300 and the inner diameter of the cavity 110 may be the same or similar to each other to provide a press fit fit between the outer periphery of the dielectric resonator 300 and the inner wall of the cavity 110.

Further, protrusions and slots corresponding to each other may be formed on the outer circumferential surface of the dielectric resonator 300 and the inner wall of the cavity 110, and they may be engaged with each other to firmly fix the dielectric resonator 300 to a predetermined position. The protrusions and slots formed on the outer circumferential surface of the dielectric resonator 300 may be implemented in the form of male and female threads corresponding to each other.

When the dielectric resonator 300 and the cavity 110 have sufficient frictional force between the dielectric resonator 300 and the cavity 110 as described above, the dielectric resonator 300 can be inserted into the cavity 110 As shown in Fig.

3 is a perspective view conceptually showing only a resonator portion in a small RF filter 1000 according to an embodiment of the present invention. That is, the housing 100 and the cover 200 are omitted, the cavity 110 formed in the housing 100 is shown, and the components in the cavity 110 are also shown.

The small RF filter 1000 according to an exemplary embodiment of the present invention may include a plurality of cavities 110a, 110b and 110c in the housing 100 and may include a plurality of cavities 110a, 110b, and 110c, And may include resonators 300a, 300b, and 300c. Each of the dielectric resonators 300a, 300b and 300c includes the resonator body 310 having the through-hole 350 and the metal layer (not shown) formed on one side of the resonator body 310 and the inner surface of the through- 370).

In the 3-pole filter shown in FIG. 3, a window is formed between the first cavity 110a and the second cavity 110b, and a window is formed between the second cavity 110b and the third cavity 110c have. On the other hand, in order to realize a desired cross-coupling between the first cavity 110a isolated from each other and the first dielectric resonator 300a and the third dielectric resonator 300c in the third cavity 110c, Member 130 is provided.

The coupling member 130 may be coupled to the housing 100 such that both ends thereof are positioned in close proximity to the first dielectric resonator 300a and the third dielectric resonator 300c. The coupling member 130 made of a metal material may cause cross coupling between the first dielectric resonator 300a and the third dielectric resonator 300c.

A space for disposing the coupling member 130 may be separately provided in the housing 100, and the coupling member 130 may be accommodated in the space.

Coupling member 130 may be used with a predetermined adjustment bolt 135. The user can manipulate the adjustment bolt 135 to adjust the relative position of the coupling member 130 with respect to the two resonators 300a and 300c. The adjustment bolt 135 may be configured to move the coupling member 130 in a specific direction when an operation is applied, or may be configured to only lock or release the coupling member 130 from the locked state. The adjustment bolt 135 may be shielded by the cover 200 so as not to protrude above the upper surface of the housing 100.

When a signal is inputted through the input line 172, resonance occurs in the first resonator 300a and resonance occurs in the second resonator 300b through the window between the first cavity 110a and the second cavity 110b Resonance occurs also in the second resonator 300b by coupling. Similarly, resonance occurs in the third resonator 300b by the coupling between the second resonator 300b and the third resonator 300c, which is performed through the window between the second cavity 110b and the third cavity 110c. do. Here, the coupling member 130 causes cross coupling between the first resonator 300a and the third resonator 300c, and finally, the signal filtered through the resonance of the third resonator 300c is output to the output line (174).

4 and 5 are graphs showing reflection loss and insertion loss when cross coupling is applied to the small RF filter shown in FIG. 6 is a graph showing spurious signals obtained from a monoblock filter according to the related art, and FIG. 7 is a graph illustrating spurious signals obtained from a small RF filter according to an embodiment of the present invention.

4 and 5, FIG. 4 shows the result when inductive cross coupling occurs between the first resonator 300a and the third resonator 300c, and FIG. 5 shows a result of the inductive cross- Shows a result when a capacitive cross coupling occurs between the resonator 300a and the third resonator 300c. The RF filter 1000 according to an embodiment of the present invention suppresses undesired parasitic coupling due to the partition walls between the cavities 110 of the housing 100 while causing cross coupling between the dielectric resonators 300. [ can do. As can be seen in FIGS. 4 and 5, the RF filter 1000 according to an embodiment of the present invention can realize a transmission zero without a problem.

Considering the spurious characteristics with reference to FIGS. 6 and 7, it can be seen in FIG. 6 that the monoblock filter according to the prior art is formed in the vicinity of 3 GHz due to the waveguide mode resonance as described above. If the spurious signal is formed in the vicinity of the passband, it may not be easy to suppress the spurious signal by the low pass filter (LPF). On the other hand, in the small RF filter according to the embodiment of the present invention shown in FIG. 7, the waveguide mode resonance is removed and the spurious is formed at 5 GHz or more.

As can be seen from the above graphs, some embodiments of the present invention provide a filter having a size similar to that of a conventional monobloc filter and having no limitation in topology design and excellent attenuation characteristics. The miniature RF filter 1000 according to an embodiment of the present invention can adjust the filter characteristics through a tuning member, a coupling member, and the like and provide a spurious characteristic similar to that of a filter using a conventional coaxial resonator, The size of the filter can be reduced.

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- Those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the scope of the present invention. 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 .

100: housing 110: cavity
130: coupling member 150:
200: cover 250: recessed portion
270: tuning member 300: dielectric resonator
350: through hole 370: metal layer

Claims (11)

A housing having a cavity opened to one side;
A dielectric resonator inserted into the cavity; And
And a cover coupled to one side of the housing,
Wherein the dielectric resonator is formed with a through hole penetrating from one side to the other along one direction, and a metal layer is formed on one surface and the other surface of the dielectric resonator and on the inner surface of the through hole.
The method according to claim 1,
Wherein the housing includes a plurality of cavities into which the dielectric resonators are respectively inserted,
The compact RF filter further includes a coupling member,
Wherein both ends of the coupling member are positioned proximate to two dielectric resonators to generate cross coupling between the two dielectric resonators.
The method according to claim 1,
Wherein the housing includes protrusions protruding along the one direction on one side of the cavity, and the dielectric resonator is disposed in the cavity so that the protrusion is inserted into the through-hole.
The method of claim 3,
Wherein an inner diameter of the through hole is smaller than an inner diameter at one side, and an inner diameter at the other side is smaller than an inner diameter at one side.
5. The method of claim 4,
Wherein the dielectric resonator is fixed by a coupling portion coupled to the projection,
Wherein an outer diameter of the fastening portion is equal to or smaller than an inner diameter at one side of the through hole and larger than an inner diameter at the other side of the through hole.
The method of claim 3,
And a tuning member coupled to the cover,
Wherein the tuning member is configured to be adjustable in distance from the cover,
Wherein the protruding portion is formed with a receiving space which is opened to one side, and the tuning member is disposed in the receiving space.
The method according to claim 1,
And at least a part of the outer circumferential surface of the dielectric resonator is in contact with the inner wall of the cavity.
8. The method of claim 7,
Wherein a protrusion and a slot corresponding to each other are formed on an outer circumferential surface of the dielectric resonator and an inner wall of the cavity, and the dielectric resonator is disposed in the cavity so that the protrusion is inserted into the slot.
The method according to claim 1,
And a tuning member coupled to the cover,
Wherein the tuning member is configured to be adjustable in distance from the cover,
And the tuning member is located on or in the through hole when the cover is coupled to the housing.
10. The method of claim 9,
The cover including a recess portion protruding toward the cavity and having an inner space opened in a direction toward the cavity,
And the tuning member is movably received within the recessed portion.
A dielectric resonator for a compact RF filter comprising a housing having a cavity open to one side,
A resonator main body formed of a dielectric material and having a through hole penetrating from one side to the other side along one direction; And
And a metal layer formed on one surface and the other surface of the resonator body and on an inner peripheral surface of the through hole.
KR1020150143380A 2015-10-14 2015-10-14 Compact rf filter using a dielectric resonator KR101766698B1 (en)

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