CN110770968A - Housing structure of RF filter and manufacturing method of the housing structure - Google Patents
Housing structure of RF filter and manufacturing method of the housing structure Download PDFInfo
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- CN110770968A CN110770968A CN201880026254.7A CN201880026254A CN110770968A CN 110770968 A CN110770968 A CN 110770968A CN 201880026254 A CN201880026254 A CN 201880026254A CN 110770968 A CN110770968 A CN 110770968A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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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
- H01P1/201—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
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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
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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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
- H01P1/208—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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- 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
Abstract
The present invention relates to a housing structure for an RF filter. The housing structure is such that, in addition to a first wall structure (WS1) and one or more resonators (R1-R6) projecting from the first wall structure towards the second wall structure (WS2), the opposite second wall structure (WS2) and a connecting structure (MW1-MW 5; EW1, EW2) between the wall structures (WS1, WS2) are also one and the same one-piece integrated component, and such that in this case each resonator (R1-R6) is of the same one-piece solid body formed by casting, injection molding or 3D printing as both the wall structures (WS1, WS2) oriented towards each other and the connecting structure (MW1-MW5, EW1-EW2) between the wall structures, each resonator (R1-R6) extending in the housing structure in the direction between the wall structures (WS1, WS 2).
Description
Background
RF filters, i.e. radio frequency filters, are used in conjunction with RF devices such as transmitters, receivers or transceivers in base stations of mobile telephone networks, for example as filtering and adaptation circuits, in particular in amplifiers in base stations.
A resonator type filter comprises a housing structure having one or more compartments, the shape of which is defined by walls of the housing structure.
Typically, the compartments of the housing structure may house an inner conductor extending from the bottom of the compartment or chamber, which is called a resonator or resonator pin, a common structure being a coaxial resonator, wherein the inner conductor or resonator shares a common axis with the surrounding compartment or chamber, i.e. is coaxial. The metallic or conductive coated walls of the compartments of the housing structure form together with the metallic or conductive coated inner conductor a resonance circuit. In more complex RF filters, the housing structure is made up of a plurality of compartments, each having a separate internal conductor or resonator, thereby forming a plurality of resonant circuits, and by appropriately coupling them together internally, the desired frequency response, i.e. stop band and pass band, is achieved.
In the case of the known housing structures of RF filters, the structural integration is not optimal, which, due to inaccuracies in the manufacturing tolerances, leads to problems in the application of the housing structure (i.e. the RF filter), such as inaccuracies with respect to the operation of the filter, for example inaccuracies in achieving a desired stop band or pass band. This problem becomes more and more severe as higher and higher frequency ranges (e.g. 3.5GHz) are used.
Disclosure of Invention
It is therefore an object of the present invention to provide a novel housing structure and a method of manufacturing an RF filter, so that the above-mentioned problems can be solved or alleviated. The object of the invention is achieved by a housing structure and a method characterized in what is stated in the independent claims. Preferred embodiments of the invention are disclosed in the dependent claims.
The invention is based on novel structure integration and a method for realizing the structure integration.
An advantage of the housing structure and method of the present invention is the novel structural integration and the improved manufacturing accuracy allowed by it, which in turn provides better frequency stability for applications of housing structures such as RF filters. The advantages result from the fact that: the surface of the housing structure, and in particular the surface of the transverse resonator comprised in the housing structure, is of high quality and not porous. The resonator "cap", i.e. the widening according to an embodiment that increases the cross-sectional area of the resonator, is integrated into the resonator, and the remaining structural entity further improves the degree of integration.
Drawings
The invention will now be described in more detail in connection with preferred embodiments and with reference to the accompanying drawings, in which:
figure 1 shows the housing structure before the resonator ends are separated from the second wall structure;
figure 2 shows the housing structure with the resonator ends already separated from the second wall structure;
fig. 3 shows a housing structure and two cover plates closing the open sides of the housing structure.
Detailed Description
With reference to fig. 1 to 3, a housing structure FR for an RF filter (radio frequency filter) is thus described. The material of the housing structure FR is, for example, aluminum or magnesium. To increase the electrical conductivity, the aluminum housing structure can be coated with a coating having a better electrical conductivity, such as silver, at the final stage of manufacture.
The housing structure FR comprises: a first wall structure WS 1; an opposing second wall structure WS2 directed toward the first wall structure WS 1; and connecting structures MW1-MW5 and/or EW1, EW2 located between and connecting the wall structures WS1, WS2, WS1, WS 2.
As mentioned above, there are two options for the connection structure, or alternatively, but preferably, i.e. in an embodiment complementary to each other, i.e. the connection structure comprises end walls EW1, EW2 and/or partition walls MW1-MW5, so that preferably both are present as in the example of the figures.
In addition, the casing structure FR comprises one or more resonator compartments C1 to C6 in the region between the wall structures WS1, WS2, said resonator compartments C1 to C6 being separated from each other by separation walls MW1-MW5, and in addition the end walls EW1, EW2 also contribute to the formation of the outermost compartments C1 and C6. The compartments C1-C6 are finally closed by separately provided side panel parts SP1, SP2 or other similar covers for covering the open sides S1, S2 of the housing structure, as shown in fig. 3.
This is the housing structure for a resonator type filter, and thus there is one or more resonators R1-R6 extending from the first wall structure WS1 towards the opposite second wall structure WS2, so that the inductive end portions IE1-IE6 of the resonators (e.g. R1-R6) are located at the side of the resonator bases B1-B6 where the resonators R1-R6 are short-circuited with the first wall structure WS1, while the free capacitive end portions CE1-CE6 of the resonators are closer to said opposite second wall structure WS 2.
In terms of the actual invention, it can be noted that, in addition to the first wall structure WS1 and the one or more resonators R1-R6 extending from the first wall structure WS1 towards said opposite second wall structure WS2, also the opposite second wall structure WS2 and the connecting structures MW1-MW5 and/or EW1-EW2 between said wall structures WS1, WS2 are constituted by the same one-piece integrated component.
In this case, each resonator R1-R6 is of the same integral one-piece integrated entity formed by casting, die casting (i.e. injection molding) or 3D printing as both the wall structures WS1, WS2 oriented towards each other and the connecting structures MW1-MW5, EW1-EW2 located between said wall structures, each resonator R1-R6 extending in the housing structure FR in a direction between said wall structures WS1, WS 2.
Common to these ways of manufacturing is that the material forming the shell structure flows forward and forms the desired shape. For example, in casting and injection molding, the material may melt, while in 3D printing, the substance forming the shell structure may melt from the powder. In casting and injection molding, a casting machine having its mold may be used.
The manufacturing method will be studied in more detail below, but even at this stage it can be noted that after the first stage of the manufacturing method, the structure of fig. 1 is achieved, wherein the resonator (or resonator preform to some extent) is connected to two long wall structures WS1, WS2, in other words not only to the first wall structure WS1 (bottom/base to some extent), but also to the opposite wall structure or second wall structure WS 2.
When the resonators R1-R6 (to some extent, preforms of the resonators) are cut, the resonators R1-R6 open out the free ends, i.e., the capacitive ends CE1-CE6, and thus the situation and structure of fig. 2 has been achieved.
A structure of the type referred to is much better than the structures of the prior art, in which the resonators rising from the bottom (which may be some kind of first wall structure) are facing the cover plate in one piece (and therefore also facing away from the bottom), rather than facing the integral wall structure of the same housing structure FR belonging to the invention.
In the present invention, the resonators are for example transverse and at right angles to the direction of the cover plates SP1, SP2, which cover plates SP1, SP2 close the housing structure at the sides S1, S2, but parallel to the direction between the wall structures SW1, WS 2. If the direction of extension of the compartment C1-C6 is interpreted as the direction between the separate cover plates SP1, SP2 closing said compartment C1-C6, the resonators R1-R6 are transverse with respect to the direction of extension of the compartments C1-C6. Due to the location of the main components of the housing structure FR in fig. 3, the cover plates SP1, SP2 in fig. 3 can also be regarded as bottom and cover. If the cover plate according to fig. 3 has been mounted in the housing structure FR in the state of fig. 1-2, it can be regarded as a side surface of the housing structure FR.
In an embodiment, at the capacitive ends CE1-CE6 of one or more resonators R1-R6 there is a widening CA1-CA6 which increases the cross-sectional area of the resonator, thereby increasing the capacitive coupling with respect to the adjacent opposing second wall structure WS 2. It can be said that each widened portion CA1-CA6 forms to some extent a capacitor structure together with the opposing wall structure WS2, with the plate surfaces facing each other.
In this case, each widened portion CA1-CA6 belongs to the same one-piece integrated entity formed by casting, injection molding or 3D printing and having said resonators R1-R6, as well as both said wall structures WS1, WS2 oriented towards each other and connecting structures MW1-MW5, EW1-EW2 between said wall structures WS1, WS2, and each resonator R1-R6 having a widened portion CA1-CA6 extends in the housing structure FR in a direction between said wall structures WS1, WS 2.
By cutting the resonators R1-R6, in addition to the above-mentioned problems, other objects can be achieved, namely forming the free/capacitive ends CA1, CA2 of the resonators R1-R6. In an embodiment, the resonator R1-R6 is cut, for example by milling, between the widened portion CA1-CA6 and the second wall structure 2, such that, for example, the cut width corresponds approximately to the distance between the widened portion (for example CA1) relative to the second wall structure WS2, since by doing so the connecting bridge MP1 between the widened portion CA1 and the second wall structure WS2 can be completely removed, and furthermore the surface of the widened portion (such as CA1) facing the second wall structure WS2 and the surface of the wall structure WS2 facing the widened portion CA1 can be made flat and smooth.
As mentioned above, the connecting structure between the wall structures WS1, WS2 may be a separating wall MW1-MW5 between the compartments C1-C6 and/or end walls EW1, EW2 at the ends.
In this case, in an embodiment, for separating the compartments C1-C6 of the housing structure, the housing structure comprises a separation wall MW1-MW5 extending between the first wall structure WS1 and the opposite second wall structure WS2, said separation wall MW1-MW5 being said connecting structure connecting said first wall structure WS1 and said opposite second wall structure WS 2. In this case, in this embodiment, the partition wall MW1-MW5 also belongs to the same one-piece integrated entity formed by casting, injection molding or 3D printing and having both the resonator R1-R6 extending in the direction of the partition wall MW1-MW5 and the wall structures WS1, WS2 oriented towards each other, the resonators R1-R6 extending in the housing structure FR in the direction between the wall structures WS1, WS 2.
Alternatively or additionally, the connection structure can be end walls EW1, EW2 of the ends of the housing structure. Thus, in an embodiment, the housing structure comprises end walls EW1, EW2, said end walls EW1, EW2 being said connecting structure connecting the first wall structure WS1 and the opposite second wall structure WS2, and end walls EW1, EW2 being located at the ends of the housing structure and being interposed between the first wall structure WS1 and the opposite second wall structure WS2 of the housing structure, and these end walls EW1, EW2 also belonging to the same one-piece integrated entity formed by casting or 3D printing and having both resonators R1-R6 extending in the direction of the end walls EW1, EW2 in question and said wall structures WS1, WS2 oriented towards each other, said resonators R1-R6 extending in the housing structure in the direction between said wall structures.
By comparing fig. 1 and 2, it can be noted that in fig. 1 the resonators R1-R6 are first of all thus in the initial stage of manufacture as a connection structure or third connection structure type, but according to fig. 2 the resonators are cut off from the second wall structure WS2, so that the resonators no longer act as a connection structure between the wall structures WS1, WS 2.
As described, the housing structure comprises a separately provided side panel part SP1, SP2, or other similar cover SP1, SP2 for covering the open side of the one-piece part of the housing structure, whereby said side panel part SP1, SP2 closes the side S1, S2 of said housing structure. Thus, the cover plates SP1, SP2 are provided as covers of a one-piece integrated housing part comprising: a first wall structure WS 1; an opposed second wall structure WS 2; connecting structures MW1-MW5, EW1-EW2 connecting the wall structures WS1, WS 2; and a resonator R1-R6 with a widening CA1-CA6 extending in the direction between the wall structures WS1, WS 2.
In an embodiment there are coupling openings IR1-IR5 connected with the partition walls, the size of which affects the mutual coupling between the resonance circuits in adjacent compartments. These coupling openings have also been formed by casting, injection moulding or 3D printing, so in practice the manufacturing method has determined the position and size of the edges, thus determining the shape of the coupling openings IR1-IR5 in the partition walls MW1-MW 5. Thus, the partition wall comprises those coupling openings. An alternative, but less optimal, approach to forming the coupling openings IR1-IR5 when casting, injection molding or 3D printing the partition walls MW1-MW5 is that drilling or machining will be used thereafter to form openings in the already formed partition walls MW1-MW 5.
The manufacturing method will be discussed next. The housing structure may be made of metal, such as aluminum or magnesium, by die casting, or it may be manufactured by injection molding, i.e. extrusion of plastic, as long as it is coated with a conductive coating. It is also possible to use 3D printing.
When casting metals, for example in die casting, die casting machines with appropriate dies are used. In the injection molding or extrusion of plastics, an injection molding machine (injection molding machine) with a suitable mold is used; and in 3D printing of metals, metal powders are melted layer by laser and a heated printing platform is used as an additional aid.
This is therefore a manufacturing method for a housing structure for an RF filter. In the method, a housing structure FR is manufactured having one or more compartments and comprising a first wall structure WS1, an opposite second wall structure WS2, a connecting structure MW1-MW5 connecting said wall structures WS1, WS2, an EW1-EW2, and one or more resonators.
According to an essential feature of the method, the housing structure FR is cast, injection molded or 3D printed as a one-piece integrated component, so that the first wall structure WS1, the opposite second wall structure WS2, the resonators R1-R6 extending in the direction between the wall structures, and the connecting structures MW1-MW5, EW1-EW2 connecting the wall structures WS1, WS2 belong to the same one-piece integrated component. This relates to the situation of fig. 1, in which a resonator, such as resonator R1, is connected to the second wall structure Ws2 by a bridge, such as bridge MP1, in addition to the first wall structure Ws 1.
Next, in a second stage of the method, each resonator is separated from the second wall structure WS2 by cutting said resonator in order to form a capacitive end for each resonator R1-R6. This results in the situation shown in figure 2.
In order to improve the method and further increase the integration of the housing structure components, in an embodiment the method is as follows: on the same background, on each resonator R1-R6, a widened portion CA1-CA6 that increases the cross-sectional area of the resonator is formed by casting, injection molding, or 3D printing as described above.
The method additionally includes: in order to form the capacitive ends CE1-CE6 for each resonator R1-R6, each resonator R1-R6 is cut between each widened portion CA1-CA6 and the second wall structure WS 2.
Thus, structures (e.g., CA1) that increase the cross-sectional area of the resonator (e.g., R1) (i.e., increase capacitive coupling) are integrated with resonator R1, and the wall structures WS1, WS2, and the separation walls MW1-MW5, as well as the end walls EW1, EW 2.
It may also be noted that the method works in such a way that the separation walls MW1-MW5 separating the compartments of the housing structure are cast or 3D printed as a connecting structure connecting two opposing wall structures WS1, WS2 and extending in the direction of the resonators.
Additionally or alternatively, the method works in such a way that the end walls EW1-EW2 at the ends of the housing structure are cast or 3D printed as a connecting structure connecting two opposing wall structures WS1, WS2 and extending in the direction of the resonators.
The housing structure FR, for example in compartments CA1, CA6, can be provided with input and output ports for signals by using openings and guide cores through, for example, end walls EW1, EW 2.
It will be obvious to a person skilled in the art that as technology advances, the basic idea of the invention can be implemented in many different ways. The invention and its embodiments are thus not limited to the examples described above, but may vary within the scope of the claims.
Claims (10)
1. A housing structure for an RF filter, the housing structure comprising: a first wall structure (WS1), an opposite second wall structure (WS2) directed towards the first wall structure, and a connecting structure (MW1-MW 5; EW1, EW2) between the wall structures (WS1, WS2) and connecting the wall structures (WS1, WS 2); said housing structure comprising one or more resonator compartments (C1-C6) in a region located between said wall structures (WS1, WS2), and wherein one or more resonators (R1-R6) extend from said first wall structure (WS1) towards said opposite second wall structure (WS2) such that an inductive end (IE1) of said resonator is located at a side of a resonator base (B1) where said resonator (R1) is short-circuited with said first wall structure (WS1) and a free capacitive end (CE1) of said resonator is closer to said opposite second wall structure (WS 2); the housing structure is characterized in that the housing structure,
in addition to the first wall structure (WS1) and one or more resonators (R1-R6) protruding from the first wall structure towards the second wall structure (WS2), the second, opposite wall structure (WS2) and the connecting structure (MW1-MW 5; EW1, EW2) between the wall structures (WS1, WS2) are also made of the same one-piece integral part, and in this case both the resonators (R1-R6) and the wall structures (WS1, WS2) oriented towards each other and the connecting structures (MW1-MW5, EW1-EW2) between the wall structures belong to the same one-piece integrated entity formed by casting, injection moulding or 3D printing, each resonator (R1-R6) extending in the housing structure in the direction between the wall structures (WS1, WS 2).
2. The housing structure according to claim 1, characterized in that at the capacitive end (CE1-CE6) of one or more resonators (R1-R6) there is a widening (CA1-CA6) that increases the cross-sectional area of the resonator, thereby increasing the capacitive coupling with respect to the second wall structure (WS2), and wherein the widening (CA1-CA6) belongs to the same one-piece integrated entity formed by casting, injection molding or 3D printing and having both the resonators (R1-R6) and the wall structures (WS1, WS2) oriented towards each other and the connecting structures (MW1-MW 5; EW1-EW2) between them; each resonator (R1-R6) with a respective widening (CA1-CA6) extends in the housing structure in a direction between the wall structures (WS1, WS 2).
3. The housing structure according to claim 1 or 2, characterized in that, for separating the compartments (C1-C6) of the housing structure, the housing structure comprises a separation wall (MW1-MW5) extending between the first wall structure (WS1) and the opposite second wall structure (WS2), and the separation wall (MW1-MW5) is the connecting structure connecting the first wall structure (WS1) and the opposite second wall structure (WS2), and wherein the separation wall (MW1-MW5) also belongs to the same integrated entity formed by casting, injection molding or 3D printing and having both the resonators (R1-R6) extending in the direction of the separation wall (MW1-MW5) and the wall structures (WS1, WS2) oriented towards each other, the resonators (R1-R6) being interposed in the housing structure along an integral body between the wall structures in the direction of the housing structure And extend the same.
4. The housing structure according to any of the preceding claims 1-3, characterized in that the housing structure comprises end walls (EW1, EW2) which are the connecting structure connecting the first wall structure (WS1) and the opposite second wall structure (WS2), and wherein the end walls (EW1, EW2) are located at the ends of the housing structure and between the first wall structure (WS1) and the opposite second wall structure (WS2) of the housing structure, and wherein these end walls (EW1, EW2) also belong to the same integrated entity formed by casting, injection molding or 3D printing and having both the integrated resonator (R1-R6) extending in the direction of the end walls (EW1, EW2) and the wall structures (WS1, WS2) oriented towards each other, the resonators (R1-R6) extend in the housing structure in a direction between the wall structures.
5. The housing structure according to any of the preceding claims 1-4, characterized in that, in order to cover the open sides of the integrated parts of the housing structure, the housing structure comprises separately provided side panel pieces (SP1, SP2) or similar cover pieces (SP1, SP 2); wherein the one-piece component comprises the first wall structure (WS1), the opposite second wall structure (WS2), the connecting structure (MW1-MW 5; EW1-EW2) connecting the wall structures (WS1, WS2), and resonators (R1-R6) extending in a direction between the wall structures (WS1, WS 2).
6. A method of manufacturing a housing structure for an RF filter, in which method a housing structure is manufactured having one or more compartments and comprising a first wall structure (WS1), an opposite second wall structure (WS2), a connecting structure (MW1-MW5, EW1-EW2) connecting the wall structures (WS1, WS2) and one or more resonators, the method being characterized in that:
-casting, injection molding or 3D printing the housing structure as a one-piece integrated component, such that the first wall structure (WS1), the opposite second wall structure (WS2), the resonators (R1-R6) extending in a direction between the wall structures, and the connecting structure (MW1-MW 5; EW1-EW2) connecting the wall structures (WS1, WS2) belong to the same one-piece integrated component; and
-separating each resonator from the second wall structure (WS2) by cutting said resonator in order to form a capacitive end of each resonator (R1-R6).
7. Method according to claim 6, characterized in that on each resonator (R1-R6), on the same background, a widening (CA1-CA6) is formed by casting, injection moulding or 3D printing, which widening (CA1-CA6) increases the cross-sectional area of the resonator.
8. Method according to claim 7, characterized in that for forming the capacitive end (CA1-CA6) of each resonator (R1-R6), the resonator is cut between each widened portion (CA1-CA6) and the second wall structure (WS 2).
9. Method according to any of the preceding claims 6-8, characterized in that the method works in the following way: the separation walls (MW1-MW5) separating the compartments of the housing structure are cast, injection molded or 3D printed as the connecting structures connecting the opposing wall structures (WS1, WS2) and extending in the direction of the resonators.
10. Method according to any of the preceding claims 6-9, characterized in that the method works in the following way: end walls (EW1-EW2) at the ends of the housing structure are cast, injection molded or 3D printed as the connecting structure connecting the opposing wall structures (WS1, WS2) and extending in the direction of the resonators.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20175200A FI128047B (en) | 2017-03-06 | 2017-03-06 | Frame structure for a RF filter and method producing the same |
| FI20175200 | 2017-03-06 | ||
| PCT/FI2018/050151 WO2018162795A1 (en) | 2017-03-06 | 2018-03-01 | Casing structure of rf filter and method for its manufacturing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110770968A true CN110770968A (en) | 2020-02-07 |
Family
ID=61622617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880026254.7A Pending CN110770968A (en) | 2017-03-06 | 2018-03-01 | Housing structure of RF filter and manufacturing method of the housing structure |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN110770968A (en) |
| FI (1) | FI128047B (en) |
| WO (1) | WO2018162795A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4034319A (en) * | 1976-05-10 | 1977-07-05 | Trw Inc. | Coupled bar microwave bandpass filter |
| EP0823746A2 (en) * | 1996-08-05 | 1998-02-11 | ADC Solitra Oy | A filter and a method for manufacturing a filter |
| CN202221805U (en) * | 2011-10-13 | 2012-05-16 | 东莞洲亮通讯科技有限公司 | No-debug coaxial cavity filter |
| CN104485497A (en) * | 2014-12-03 | 2015-04-01 | 武汉虹信通信技术有限责任公司 | TE01 mixing cavity filter device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004105173A1 (en) * | 2003-05-21 | 2004-12-02 | Kmw Inc. | Radio frequency filter |
| SG189128A1 (en) * | 2010-09-29 | 2013-05-31 | Aviat Networks Inc | Systems and methods for manufacturing passive waveguide components |
-
2017
- 2017-03-06 FI FI20175200A patent/FI128047B/en not_active IP Right Cessation
-
2018
- 2018-03-01 WO PCT/FI2018/050151 patent/WO2018162795A1/en active Application Filing
- 2018-03-01 CN CN201880026254.7A patent/CN110770968A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4034319A (en) * | 1976-05-10 | 1977-07-05 | Trw Inc. | Coupled bar microwave bandpass filter |
| EP0823746A2 (en) * | 1996-08-05 | 1998-02-11 | ADC Solitra Oy | A filter and a method for manufacturing a filter |
| CN202221805U (en) * | 2011-10-13 | 2012-05-16 | 东莞洲亮通讯科技有限公司 | No-debug coaxial cavity filter |
| CN104485497A (en) * | 2014-12-03 | 2015-04-01 | 武汉虹信通信技术有限责任公司 | TE01 mixing cavity filter device |
Also Published As
| Publication number | Publication date |
|---|---|
| FI128047B (en) | 2019-08-30 |
| WO2018162795A1 (en) | 2018-09-13 |
| FI20175200L (en) | 2018-09-07 |
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