KR20140026235A - Radio frequency filter with cavity structure - Google Patents
Radio frequency filter with cavity structure Download PDFInfo
- Publication number
- KR20140026235A KR20140026235A KR1020130006964A KR20130006964A KR20140026235A KR 20140026235 A KR20140026235 A KR 20140026235A KR 1020130006964 A KR1020130006964 A KR 1020130006964A KR 20130006964 A KR20130006964 A KR 20130006964A KR 20140026235 A KR20140026235 A KR 20140026235A
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- radio frequency
- frequency filter
- case
- cavity
- recessed portion
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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
-
- 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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
- H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
-
- 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
- H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
- H01P1/2138—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using hollow waveguide filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/007—Manufacturing frequency-selective devices
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The present invention relates to a radio frequency filter having a cavity structure, comprising a housing having a hollow inside and a cavity blocked from the outside, and a resonating element positioned in the inner hollow of the housing, wherein the housing corresponds to the resonating element. The surface is characterized in that the uneven structure is formed.
Therefore, it is possible to further reduce the size and weight, and is designed to be capable of frequency tuning without employing the fastening structure of the tuning screw and the fixing nut, it is possible to have a simple and simplified structure.
Description
The present invention relates to a radio signal processing apparatus used in a wireless communication system, and more particularly to a radio frequency filter having a cavity structure, such as a cavity filter.
A radio frequency filter having a cavity structure generally has a housing space such as a rectangular parallelepiped through a housing made of metal and has a plurality of cavity structures. A dielectric resonance element (DR) or a metal resonator rod Each of the resonance elements is constituted to generate a very high frequency resonance. Further, in the radio frequency filter having such a cavity structure, a cover for shielding the opening face of the cavity structure is provided on the upper part of the cavity structure, and as a tuning structure for tuning the filtering characteristic of the corresponding radio frequency filter, A nut for fixing the tuning screw and the tuning screw may be installed. As an example of a radio frequency filter having a cavity structure, Korean Patent Laid-Open Publication No. 10-2004-100084 (name: radio frequency filter, published date: December 02, 2004), inventor: Jong-Kyu Park, Park, Sang-sik, Jung Seung-taek) for example.
A radio frequency filter having such a cavity structure is used for processing a transmission / reception radio signal in a wireless communication system, and is particularly applied to a base station or a repeater in a mobile communication system.
Meanwhile, the base station apparatuses (usually bulky and heavy) of the base stations or repeaters of the mobile communication system are installed on the ground as compared with the antenna apparatuses installed on columns at a higher place from the ground, To the present day. However, such an installation method has a problem of loss due to cable connection between the antenna device and the main body device and a problem of securing the installation space of the main body device. In recent years, due to the constant weight and miniaturization of the devices, (At least some of the modules) are installed directly on an installation pole or the like of the antenna device and directly connected to the antenna device, or are incorporated in the antenna device.
Therefore, in manufacturing a radio frequency filter applied to a base station or a repeater of such a mobile communication system, the reduction in size and weight has become a major consideration.
However, a radio frequency filter having a cavity structure has a structure in which a resonance element is to be provided in a housing, and a coupling structure of a cover and a housing is basically required. Moreover, fastening structures, such as a number of tuning screws and fastening nuts, present great constraints on the tilt and miniaturization of radio frequency filters.
Accordingly, the present invention is to provide a radio frequency filter having a cavity structure that can be more compact and lightweight.
Another object of the present invention is to provide a radio frequency filter having a cavity structure which is simple to manufacture and can have a simplified structure.
Still another object of the present invention is to provide a radio frequency filter having a cavity structure which can be designed to enable frequency tuning without employing a fastening structure of a tuning screw and a fixing nut.
In order to achieve the above object, the present invention provides a radio frequency filter having a cavity structure, including a housing having a hollow inside and a cavity blocked from the outside, and a resonant element located in the inside hollow of the housing. Is characterized in that the concave-convex structure is formed on the surface corresponding to the resonance element.
In addition, the housing includes a first case provided with the resonating element and a second case covering the first case, wherein the first and second cases are each press-processed or die-casted using one base plate. Characterized in that formed.
As described above, the radio frequency filter having a cavity structure according to the present invention can be more compact and lighter, and is designed to be capable of frequency tuning without employing a fastening structure of a tuning screw and a fixing nut, and is simple and simplified. It can have a structure.
Therefore, the manufacturing can be simplified and the cost reduction effect can be obtained, and there is an advantage that it can be easily installed at the time of mounting to a station such as a base station due to its small size and light weight.
1 is an exploded perspective view of a radio frequency filter having a cavity structure according to a first embodiment of the present invention
2 is an exploded perspective view of FIG. ≪ RTI ID =
3 is a perspective view taken partially along the line AA ′ of FIG. 2;
4 is a cross-sectional view taken along the line A-A 'of FIG.
5 is a diagram illustrating a frequency tuning operation state of FIG. 3.
6 is a configuration diagram of a frequency tuning apparatus for a radio frequency filter according to a first embodiment of the present invention;
7 is an exploded perspective view of a radio frequency filter having a cavity structure according to a second embodiment of the present invention;
FIG. 8 is a perspective view of a cutaway portion AA ′ in the coupling structure of FIG. 7; FIG.
9 to 11 illustrate modified examples of the first and second embodiments of the present invention.
12 is a perspective view of a radio frequency filter having a cavity structure according to a third embodiment of the present invention.
13 is a perspective view of a radio frequency filter having a cavity structure according to a fourth embodiment of the present invention;
14 is a perspective view of an upper case of a radio frequency filter having a cavity structure according to a fifth embodiment of the present invention;
15 is a fragmentary sectional view taken along the line AA ′ of FIG. 14;
16 is a perspective view of an upper case of a radio frequency filter having a cavity structure according to a sixth embodiment of the present invention;
FIG. 17 is a fragmentary sectional view taken along the line AA ′ of FIG. 16;
18 is a structural diagram of upper cases of a radio frequency filter having a cavity structure according to a seventh embodiment of the present invention
19 is a perspective view of an upper case of a radio frequency filter having a cavity structure according to an eighth embodiment of the present invention;
20 is a fragmentary sectional view taken along line AA ′ of FIG. 19.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 is an exploded perspective view of a radio frequency filter having a cavity structure according to a first embodiment of the present invention, FIG. 2 is a combined perspective view of FIG. 1, FIG. 3 is a partially cutaway perspective view of FIG. FIG. 5 is a cross-sectional view taken along the line AA ′ of FIG. 2, and FIG. 5 is a diagram illustrating the frequency tuning operation state of FIG. 3, and FIG. 6 is an overall configuration diagram of the frequency tuning device of FIG. 5. 1 to 6, a radio frequency filter having a cavity structure according to a first embodiment of the present invention has a housing having a cavity inside and a cavity blocked from the outside, similarly to the related art. A resonance element is provided in the hollow inside. In this case, the enclosure may include a first case in which the resonating element is located and a second case covering the first case. That is, the enclosure includes a second case having an
In the example of Figures 1 to 6, the
At this time, the
Like the
The
Referring to FIG. 6, the overall configuration of the frequency tuning device will be described. The radio frequency filter 1 according to the first embodiment of the present invention, which is a frequency tuning object, may be configured to include a steering angle device 5 having a
For example, a plurality of
Looking at the radio frequency filter having a cavity structure according to the first embodiment of the present invention as shown in Figs. 1 to 6, the
In particular, the radio frequency filter structure according to the embodiment of the present invention can be used for a more compact and higher power, compared to the structure having a conventional tuning screw. If a tuning screw is used, for example, at a high power of 50 W, the clearance between the tuning screw and the resonator element should be maintained at least 5 mm. This is because the capacitance is concentrated at the edge of the tuning screw, the closer the gap between the tuning screw and the resonator element, the greater the possibility of sparking. On the other hand, since the present invention does not include such a tuning screw, the gap between the resonating element, the upper end, and the upper case can be further narrowed, and more stable operation can be achieved even at high output.
FIG. 7 is an exploded perspective view of a radio frequency filter having a cavity structure according to a second embodiment of the present invention, and FIG. 8 is a perspective view taken partially along the line AA ′ in the coupling structure of FIG. 7, and according to a second embodiment of the present invention. The structure according to the above shows an example in which a plurality of cavities, for example, six cavity structures are connected in multiple stages. 7 and 8 may be viewed as a structure in which the structures of the first embodiment illustrated in FIGS. 1 to 6 are arranged in two rows of three each in order.
7 and 8, in the structure according to the second embodiment of the present invention, the
In addition, in FIGS. 7 and 8, the
7 and 8, the
In addition, the
Meanwhile, in FIG. 7, the conductive pin injection hole for shorting both of them is formed at the position corresponding to the
As described above, a radio frequency filter having a cavity structure according to the first and second embodiments of the present invention may be configured, and in the meantime, there may be various embodiments or modifications in addition to the present invention. For example, in the first and second embodiments, the concave-convex structure has been described as having one ring-shaped recessed portion, but the concave-convex structure may have various forms.
In the example of FIG. 9, a concave-convex structure having an annular recessed
In addition, in another embodiment of the present invention, as shown in FIG. 12, as a simpler structure, the uneven structure may be omitted in the
In addition, in another embodiment of the present invention, as shown in Figure 13, the
In addition, in another embodiment of the present invention, as in the embodiment shown in Figs. 7 and 8, in the filter structure having a plurality of cavities, the upper case in the position corresponding to the coupling window of the lower case In the first and second embodiments, a structure that performs coupling tuning by further forming an uneven structure similar to the tuning structure for frequency tuning may be employed.
In addition, in the above description, the upper case and the lower case have been described as being made of aluminum or magnesium, but may be made of various materials. In this case, the upper case and the lower case may be formed of the same material. Alternatively, the upper case and the lower case may be formed of different materials.
In addition, as shown in FIG. 7 and FIG. 8, in particular, when the upper case is configured in the form of a thin plate, the upper case may be made of a plastic material. Of course, in addition to the thin plate form, the upper case or the lower case may be implemented with a plastic material.
In addition, in the description of the first and second embodiments, it has been described that both the upper case and the lower case of the present invention are formed by a press molding method, but in addition to the lower case is implemented in the same manner as in the prior art, According to the exemplary embodiment, only the upper case having the uneven structure may be advantageous in size and weight reduction of the product.
In addition, in another embodiment of the present invention, the overall appearance is similar to the structure of the first embodiment, but the upper case is formed including the upper surface and the side when viewed in the entire filter structure is formed in the form of a pocket, the lower side The case may be configured to form only the surface corresponding to the lower surface in the overall filter structure. In addition to the interface (bonding surface) between the upper case and the lower case can be appropriately set at any position on the side in the overall structure of the radio frequency filter, the upper case and the lower case can be formed accordingly.
In addition, in the above description, in the embodiments according to the present invention, the upper case and the lower case forming the housing of the radio frequency filter are described as being formed in a press process, in addition to the upper case and / or the lower case is conventional It may be formed by a die casting method such as in die casting or a die casting mold.
FIG. 14 is a perspective view illustrating an upper case (ie, a second case) serving as a cover of a radio frequency filter having a cavity structure according to a fifth embodiment of the present invention, and FIG. 15 is a cross-sectional view taken along line AA ′ of FIG. 14. In the fifth embodiment of FIGS. 14 and 15, the illustration of the lower case is omitted for convenience of description. In addition, the fifth embodiment shown in FIGS. 14 and 15 has a structure in which six cavity structures are sequentially connected in two rows of three, for example, like the second embodiment shown in FIGS. 7 and 8. The
14 and 15, the
In addition, a plurality of (eg, four) circular
Meanwhile, the main recessed
In the structure according to the fifth embodiment shown in FIGS. 14 and 15, the basic thickness of the
In addition, even when frequency tuning is precisely completed by forming a dot pin in the main recessed
FIG. 16 is a perspective view of an upper case of a radio frequency filter having a cavity structure according to a sixth embodiment of the present invention, and FIG. 17 is a fragmentary sectional view taken along line AA ′ of FIG. 16, and is shown in FIG. 16 and FIG. In the drawings, the lower case is omitted for convenience of description. The lower case which is not shown may have a structure similar to that of the second embodiment shown in FIGS. 7 and 9, and in addition, a structure in which a resonant element manufactured separately is provided in the same manner as in the conventional and conventional structures. Branches may have.
16 and 17, a plurality of dot pin structures (not shown) are formed in the upper case 33 serving as a cover in the radio frequency filter according to the sixth embodiment of the present invention during a frequency tuning operation. It can be seen that a relatively large number of recessed structures 332 (eg, 23 for each cavity) are formed to be disposed over the entire area with a relatively even distribution.
The plurality of recessed
In addition, after the frequency tuning operation is primarily performed using only a part of the plurality of recessed
18 is a structural diagram of upper cases of a radio frequency filter having a cavity structure according to a seventh embodiment of the present invention, in which radio frequency filters having one cavity structure are shown. In the seventh embodiment illustrated in FIG. 18, the illustration of the lower case is omitted for convenience of description.
Referring to FIG. 18, in order to form a plurality of dot pin structures (not shown) in the first and second upper cases 35-1 and 35-2, the frequency tuning operation is illustrated in FIGS. 14 and 15. It is shown that a depression structure similar to the fifth embodiment described above is formed.
The first and second upper cases 35-1 and 35-2 have recessed structures similar to each other, and there is a difference in overall size between them. For example, the thickness of the first upper case 35-1 may be 0.5T, and the thickness of the second upper case 35-2 may be 2T. When the thickness of the upper case is thick, it is formed through cutting of the recessed structure formed therein.
As described above, the seventh embodiment of the present invention shows that the present invention can be applied to a radio frequency filter having a relatively large size and a thick upper case when forming a recessed structure. This indicates that the present invention is preferably applied to a relatively small and lightweight radio frequency filter, but can also be applied to a radio frequency filter of a normal size. In this case, it has a simpler structure and can be manufactured quickly at a lower cost than the structure employing the fastening structure of the tuning screw and the fixing nut in the related art, and has the same effect of improving the PIMD characteristics or applying to a higher output. Can be.
19 is a perspective view of an upper case of a radio frequency filter having a cavity structure according to an eighth embodiment of the present invention, and FIG. 20 is a cross-sectional view taken along the line AA ′ of FIG. 19, and the eighth embodiment shown in FIGS. 19 and 20. In the drawings, the lower case is omitted for convenience of description.
19 and 20, in the
In this case, unlike the fifth embodiment shown in FIGS. 14 and 15, the main recessed
As shown in FIG. 14 to FIG. 20, the fifth to eighth embodiments of the present invention may be formed, and at least some components of the embodiments may be formed in other embodiments including the first to fourth embodiments. It can be applied as well. For example, the auxiliary recessed portion as shown in FIG. 14 may be applied in other embodiments as well.
In addition, in some cases, the structure according to the embodiments may be differently applied to each cavity in the radio frequency filter in which the cavity structure is connected in multiple stages.
Claims (17)
A housing having a hollow inside and having a cavity blocked from the outside;
And a resonance element located in an inner hollow of the housing,
The enclosure includes a first case in which the resonating element is located, and a second case covering the first case.
The second case is a radio frequency filter, characterized in that a plurality of dot pin (dot peen) structure is formed by the external rudder equipment.
The first and second cases are each a radio frequency filter, characterized in that formed by pressing or die-casting method using a single base material.
A radio frequency filter, characterized in that it is formed so as to protrude from the protruding from the center side of the first case.
And a concave-convex structure having a concave-convex surface that is recessed or protruded in a portion corresponding to the resonating element.
A main depression portion formed at a portion corresponding to the resonance element;
And at least one auxiliary recessed portion formed near the main recessed portion.
A housing having a hollow inside and having a cavity blocked from the outside;
And a resonance element located in an inner hollow of the housing,
In the enclosure,
And a concave-convex structure having a concave-convex surface that is recessed or protruded in a portion corresponding to the resonance element.
A first case including the resonating element and a second case covering the first case,
And said first and second cases are each formed by press working using a single base plate.
A radio frequency filter, characterized in that the protruding from the center side of the first case formed in one piece.
A radio frequency filter, characterized in that it is thinner than the thickness of adjacent surfaces.
Applications Claiming Priority (2)
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KR1020120092374 | 2012-08-23 | ||
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20150118768A (en) * | 2014-04-15 | 2015-10-23 | 주식회사 케이엠더블유 | Radio frequency filter with cavity structure |
WO2016068512A1 (en) * | 2014-10-28 | 2016-05-06 | 주식회사 케이엠더블유 | Wireless frequency filter having cavity structure |
WO2016171380A1 (en) * | 2015-04-20 | 2016-10-27 | 주식회사 케이엠더블유 | Radio frequency filter having cavity structure |
WO2018080078A1 (en) | 2016-10-25 | 2018-05-03 | 주식회사 케이엠더블유 | Radio frequency filter having cavity structure |
WO2018203655A1 (en) | 2017-05-02 | 2018-11-08 | 주식회사 케이엠더블유 | Cavity-type radio frequency filter |
KR101939989B1 (en) * | 2018-08-01 | 2019-01-18 | 주식회사 엘트로닉스 | High frequency filter |
WO2019151655A1 (en) | 2018-01-31 | 2019-08-08 | 주식회사 케이엠더블유 | Radio frequency filter |
US10777869B2 (en) | 2015-11-30 | 2020-09-15 | Kmw Inc. | Cavity type wireless frequency filter having cross-coupling notch structure |
KR102377519B1 (en) * | 2021-11-10 | 2022-03-22 | (주)웨이브텍 | Cavity Structural Wireless Frequency Filter Having Resonator Tuning Structure |
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Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20150118768A (en) * | 2014-04-15 | 2015-10-23 | 주식회사 케이엠더블유 | Radio frequency filter with cavity structure |
WO2016068512A1 (en) * | 2014-10-28 | 2016-05-06 | 주식회사 케이엠더블유 | Wireless frequency filter having cavity structure |
KR20160049868A (en) * | 2014-10-28 | 2016-05-10 | 주식회사 케이엠더블유 | Radio frequency filter with cavity structure |
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CN107210506B (en) * | 2014-10-28 | 2023-07-11 | 株式会社Kmw | Radio frequency filter with cavity structure |
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US10777869B2 (en) | 2015-11-30 | 2020-09-15 | Kmw Inc. | Cavity type wireless frequency filter having cross-coupling notch structure |
WO2018080078A1 (en) | 2016-10-25 | 2018-05-03 | 주식회사 케이엠더블유 | Radio frequency filter having cavity structure |
US10998603B2 (en) | 2016-10-25 | 2021-05-04 | Kmw Inc. | Radio frequency filter having cavity structure |
US11108121B2 (en) | 2017-05-02 | 2021-08-31 | Kmw Inc. | Cavity-type radio frequency filter |
WO2018203655A1 (en) | 2017-05-02 | 2018-11-08 | 주식회사 케이엠더블유 | Cavity-type radio frequency filter |
WO2019151655A1 (en) | 2018-01-31 | 2019-08-08 | 주식회사 케이엠더블유 | Radio frequency filter |
US11196137B2 (en) | 2018-01-31 | 2021-12-07 | Kmw Inc. | Radio frequency filter |
KR20230027139A (en) * | 2018-01-31 | 2023-02-27 | 주식회사 케이엠더블유 | Radio frequency filter |
WO2020027355A1 (en) * | 2018-08-01 | 2020-02-06 | 주식회사 엘트로닉스 | High-pass filter |
KR101939989B1 (en) * | 2018-08-01 | 2019-01-18 | 주식회사 엘트로닉스 | High frequency filter |
KR102377519B1 (en) * | 2021-11-10 | 2022-03-22 | (주)웨이브텍 | Cavity Structural Wireless Frequency Filter Having Resonator Tuning Structure |
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