CN1574627A - Radio frequency filter - Google Patents
Radio frequency filter Download PDFInfo
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- CN1574627A CN1574627A CN 200410076629 CN200410076629A CN1574627A CN 1574627 A CN1574627 A CN 1574627A CN 200410076629 CN200410076629 CN 200410076629 CN 200410076629 A CN200410076629 A CN 200410076629A CN 1574627 A CN1574627 A CN 1574627A
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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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Abstract
A radio frequency filter is disclosed. It has a metallic housing, which has a containing space extending along its longitudinal direction, and thus is easy to manufacture with little manufacturing cost. The metallic housing of the disclosed radio frequency filter is manufactured using a extrusion process. Therefore, the precision of products is guaranteed and the manufacturing cost of the radio frequency filter is reduced by decreasing the unit price. In addition, the metallic housing, which is fabricated through the extrusion process, has an initial form of a long frame, which can be cut into appropriate length and used according to the specification needed for the product. This enables active adaptation to the product specification. Furthermore, the metal resonator rods and the window rods are integrally formed in a single fixing frame and thus can be easily installed in the housing.
Description
Technical field
The present invention relates to a kind of radio-frequency filter (radio frequency filter), the radio-frequency filter of particularly a kind of easy manufacturing and low cost of manufacture.
Background technology
Radio-frequency filter generally is used for transmission, obstruction and the time delay of service frequency frequency band (service frequency band) signal.By tuner the resonance frequency of radio-frequency filter is carried out tuning, thereby adjust its characteristic.
Referring to figs. 1 to Fig. 6 traditional radio-frequency filter 100 is described.
Fig. 1 according to prior art, have the perspective view of embodiment of the radio-frequency filter 100 of plate-like metal resonators connecting rod 120.As shown in Figure 1, this radio-frequency filter 100 comprises metal shell 110, plate-like metal resonators connecting rod 120, end cap 160 and tuning screw 170,175.
Plate-like metal resonators connecting rod 120 comprises: metal resonators connecting rod 121, and extend its bottom surface from metal shell 110; Dish 122, it extends radially going up along the outer surface of upper of metal resonators connecting rod 121 of metal resonators connecting rod 121.
Radio-frequency filter 100 is characterised in that and is the low resonant frequency operation that its mid-game 122 is placed on the metal resonators connecting rod 120 that is assemblied in the metal shell 100.
Correlation between the resonance frequency of below explaining and metal shell 110, plate-like metal resonators connecting rod 120, dividing plate 130 and the end cap 160.
Usually, resonance frequency is by capacitance and inductance coefficent decision, it produces in capacity cell 17 and inductance element 19 formed resonant circuits, particularly produces between metal shell 110, plate-like metal resonators connecting rod 120, dividing plate 130 and end cap 160, as shown in Figure 6 circuit diagram.
Simultaneously, with reference to Figure 4 and 5, input and output connector 111,113 links to each other with plate-like metal resonators connecting rod 120 with outlet terminal coupling copper cash 117 via input terminal coupling copper cash 115 respectively.
As above the resonance frequency of the radio-frequency filter 100 of Gou Chenging is subjected to the influences such as length, external diameter of plate-like metal resonators connecting rod 120, and obtains tuning more accurately by tuning screw 170,175 separately.
With reference to figure 1, tuning screw 170,175 is fixed on the position corresponding to the end cap 160 of those plate-like metal resonance connecting rods 120, these plate-like metal resonance connecting rods 120 are positioned in the metal shell 110, also corresponding to those coupling windows 131-135, these coupling windows are formed in the dividing plate 130 in its position.Tuning screw 170,175 is used for the resonance and the coupled characteristic and fixing to prevent their motions by nut 171 after tuning of tuned radio frequency filter 100.End cap 160 provides fixing hole 169 for screw 179, have fixed strip (fixing tab) 180 in the upper end of metal shell 110 in case on metal shell 110 fixing end cap 160.
Tuning screw 170,175 is fixed in the screw (not shown) that forms on the end cap 160, and is used for tuning resonance frequency, inductance coefficent or electric capacity.In other words, by fixing or unclamp 170,175 pairs of radio-frequency filters 100 of tuning screw carry out tuning so that obtain the resonance and the coupled characteristic of expectation.Behind tuned radio frequency filter 100, for example, tuning screw 170,175 is fixed on the end cap 160 by using nut 171, because the effect of tuning screw 170,175, resonance frequency, resonance and coupled characteristic are changed.
At this moment, tuning screw 170,175 is divided into: first tuning screw 170, its position that is fixed be corresponding to those plate-like metal resonators connecting rods 120, and be used for the tuned resonance characteristic; And, second tuning screw 175, its position that is fixed is corresponding to those coupling windows 131-135, and is used to tuning coupled characteristic.Second tuning screw 175 also is known as the coupling screw.Therefore, according to its position, first and second tuning screws 170,175 have different effects.
The operation of radio-frequency filter 100 is described referring now to Fig. 1 to Fig. 6.
Input terminal coupling copper cash 115 and outlet terminal coupling copper cash 117 provide inductance coupling high 52,58.Metal shell 110, plate-like metal resonators connecting rod 120 and end cap 160 are formed parallel LC resonant circuit 10,11,12,13,14 and 15.Among the resonant circuit 10-15 each all relies between each adjacent disc-shaped metal resonators connecting rod 120, between plate-like metal resonators connecting rod 120 and the metal shell 110 or the relation between each coupling window 131-135 capacitive coupling 17 or inductance coupling high 19 are provided.
If wireless frequency signal is applied to input connector 111, can produce electric current and electromagnetic energy by input terminal coupling copper cash 115.Electromagnetic energy is sent to parallel LC resonant circuit 10, and it is made up of metal shell 110, plate-like metal resonators connecting rod 120 and end cap 160.Only have the energy component of electromagnetic energy to be sent to next adjacent parallel LC resonant circuit 11 and residual components and be grounded G, the frequency of this energy component is consistent with the resonance frequency Fo of parallel LC resonant circuit 10.Inductance coupling high 53 formation between parallel LC resonant circuit 10 and next adjacent parallel LC resonant circuit 11, and the energy component that frequency accords with its resonance frequency is transmitted.Therefore, between input and output connector 111,113, radio-frequency filter 100 has the structure that walk abreast LC resonant circuit 10-15 and inductance or capacitive coupling are cascaded.
Therefore, if frequency signal affacts input connector 111, have only the corresponding signal component of resonance frequency of frequency and parallel LC resonant circuit 10-15 to be output by out connector 113.
, traditional radio-frequency filter has limitation, because they have many dividing plates in its metal shell, so metal shell should be processed with the high accuracy casting process, for example die casting maybe should be ground (milling) processing.Its result directly causes having increased manufacturing cost.Especially, casting processing can spend a large amount of mould manufacturing expenses and be unsuitable for small-scale production, although milled processed is fit to small-scale production, is not suitable for large-scale production.
Summary of the invention
Therefore, the present invention is in order to solve prior art problems mentioned above, and the object of the present invention is to provide a kind of radio-frequency filter of easy to manufacture and low cost of manufacture.
Another target of the present invention is to provide a kind of radio-frequency filter of being convenient to assemble.
In order to realize this target, the radio-frequency filter that is provided comprises: metal shell, and it has spatial accommodation, and this space is open along its longitudinal extension and its opposite end; At least two metal resonators connecting rods, its bottom surface from spatial accommodation extend upward and along vertical arrangement of shell; Tuning screw is fixed on the metal shell upper surface, and its end is facing to the upper end of the metal resonators connecting rod in the spatial accommodation; And the coupling screw between the metal resonators connecting rod, and is fixed on the upper surface of outer cover, and its fixed position is corresponding with those window connecting rods.
According to a further aspect in the invention, the radio-frequency filter that is provided comprises: shell, and it has spatial accommodation, and this space is open along its longitudinal direction extension and its opposite end; Fixed frame, it is fixed on the bottom surface of spatial accommodation of shell and along the longitudinal extension of shell; At least one metal resonators connecting rod extends up to predetermined altitude from fixed frame; Tuning screw is fixed on the metal shell upper surface, and its end is facing to the upper end of the metal resonators connecting rod in the spatial accommodation; Front and rear cover is with each opposite end coupling of spatial accommodation, so that sealing seals spatial accommodation.
Metal resonators connecting rod and window connecting rod vertically being arranged alternately along fixed frame.
Description of drawings
By below in conjunction with the accompanying drawing detailed description of the present invention, above and other target, characteristics and advantage of the present invention will be clearer and more definite, wherein:
Fig. 1 is the perspective view of description according to the embodiment of the radio-frequency filter of prior art;
Fig. 2 is the perspective view that part splits, and the structure of radio-frequency filter shown in Figure 1 has been described;
Fig. 3 is the sectional view that part splits, and the structure of radio-frequency filter shown in Figure 2 has been described;
Fig. 4 is the perspective view of inside of describing the input terminal of radio-frequency filter shown in Figure 1, this figure B intercepting along the line;
Fig. 5 is the perspective view of inside of describing the outlet terminal of radio-frequency filter shown in Figure 1, this figure C intercepting along the line;
Fig. 6 is an equivalent circuit diagram of describing radio-frequency filter operation shown in Figure 1;
Fig. 7 is the perspective view that the part of radio-frequency filter according to a preferred embodiment of the invention splits;
Fig. 8 is the sectional view of radio-frequency filter shown in Figure 7;
Fig. 9 is the perspective view that the window connecting rod of radio-frequency filter shown in Figure 7 has been described;
Figure 10 is the perspective view that the another kind of window connecting rod of radio-frequency filter shown in Figure 7 has been described; With
Figure 11 is the perspective view of the fractionation of radio-frequency filter according to another embodiment of the invention.
Embodiment
Hereinafter, will be described the preferred embodiments of the present invention with reference to the accompanying drawings.In the description below the present invention, when purport of the present invention is not really known, introduce the application's the known function and the detailed description of structure and be omitted, in order to avoid it makes main body of the present invention unclear.
Fig. 7 is the perspective view that the part of radio-frequency filter 700 according to a preferred embodiment of the invention splits, and Fig. 8 is the sectional view of radio-frequency filter 700 shown in Figure 7.As shown in Figure 7 and Figure 8, according to a preferred embodiment of the invention, radio-frequency filter 700 comprises metal shell 701, metal resonators connecting rod 702, window connecting rod 705, tuning screw 703a, coupling screw 703b, front end housing 704a and rear end cap 704b.
This metal shell 701 has spatial accommodation 711a, 711b, and its longitudinal extension and its opposite end along metal shell is open.This spatial accommodation 711a, 711b are by dividing plate 713a separated into two parts, and this dividing plate is along the longitudinal extension of metal shell 701.The end of dividing plate 713a and an end in contact of metal shell 701, the other end of the other end of dividing plate 713a and metal shell 701 is spaced a predetermined distance from simultaneously.Therefore, limit a space between the other end of the other end of dividing plate 713a and metal shell 701, this space provides coupling window 713b.The spatial accommodation 711a of two separation, 711b communicates with each other by coupling window 713b.
The outer surface of metal shell 701 is provided with many projection 715a along its longitudinal extension.Projection 715 a have fixing hole 715b on its opposite end, this fixing hole is along the longitudinal extension of metal shell 701.Dividing plate 713 also has the fixing hole (not shown) that is formed on its end.Metal shell 701 is made by metal material usually, but if necessary also can be made by synthetic resin.When shell is made by synthetic resin, can plate metallic paint on the surface of shell according to the characteristic of radio-frequency filter.
Many screw 717a, 717b, 717c are arranged on the upper surface of metal shell 701, and it is communicated with spatial accommodation 711a, 711b.Screw 717a, 717b, 717c are coupled so that stationary window connecting rod 705 with tuning screw 703a, coupling screw 703b or screw 739a selectively.
Have the metal shell 701 utilization extruding of structure as mentioned above and make, this is because it is made up of spatial accommodation 711a, 711b and dividing plate 713a along its longitudinal extension.The advantage of extrusion process is, compares with the manufacture process of the high accuracy casting processing of for example die casting or for example grinding, and it can make the production product reduce cost, and need not take notice of the quantity of product.By extruding, metal shell is manufactured into framework at first.This framework is cut the metal shell that becomes to meet final specification length subsequently, and it is provided with fixing hole 715b and screw 717a, 717b, 717c etc.If desired, spatial accommodation 711a, the 711b of metal shell 701 can be able to be formed a space, rather than be separated by dividing plate 713a.In other words, in the present embodiment, although metal resonators connecting rod 702 is aligned to two rows, if necessary, they also can be arranged in a row.
At least two metal resonators connecting rods 702 are arranged in the metal shell 701, and its bottom surface from spatial accommodation 711a, 711b extends upward, and have dish 721, and this dish radially extends from the last outer surface of connecting rod.In the drawings, three pairs of metal resonators connecting rods 702 are arranged in two row.Metal resonators connecting rod 702 relies on screw 723 to be fixed on the bottom surface of spatial accommodation 711a, 711b, and this screw is fixed from the bottom surface of metal shell 701.Metal resonators connecting rod 702 has the downward tuned window 725 that extends in surface from it.Should be understood that, when metal resonators connecting rod 702 is fixed on the bottom surface of spatial accommodation 711a, 711b, screw 717a should be arranged on the line with tuned window 725, this screw is formed on the screw 717a that forms on the upper surface of metal shell 701,717b, selected one corresponding position among the 717c.
Therebetween, if necessary, metal resonators connecting rod 702 can form the not coaxial metal resonator connecting rod (not shown) of tep reel 721.If like this, can add screw thread in the lower end of metal resonators connecting rod 702 so that directly be fixed on the lower end of metal shell 701.This is similar to the method that window connecting rod 705 is fixed on the metal shell 701, and is as described below.
It is identical that window connecting rod 705 and dividing plate 130 (as shown in Figure 1) play a part, and this dividing plate 130 has traditional coupling window 131-135 (as shown in Figure 1).Each window connecting rod 705 all is positioned between two adjacent metal resonator connecting rods and to its coupled characteristic and exerts an influence.Window connecting rod 705 extends to its upper surface from the bottom surface of spatial accommodation 711a, 711b.With reference to figure 8 and Fig. 9, window connecting rod 705 has threaded portion 751 in its lower end, and it is fixed on the lower end of metal shell 701 so that fix.In order to ensure the secure fixation between window connecting rod 705 and the metal shell 701, window connecting rod 705 has the fixing hole 753 that is formed on its upper surface, and screw 739a is fixed to this fixing hole from the top of metal shell 701.Screw 739a can be fixed together with packing ring 739b.At least one window connecting rod 705 is fixed between the metal resonators connecting rod 702 of two vicinities.In other words, according to the size of spatial accommodation 711a, 711b and the coupled characteristic between the adjacent metal resonator connecting rod 702, will provide one, two or more window connecting rod 705.When pair of windows connecting rod 705 was provided, this was arranged between two adjacent metal resonator connecting rods 702 along same direction successively to window connecting rod 705 and coupling screw 703b, and it is vertical perpendicular to metal shell 701.
Simultaneously, according to its characteristic, resonance frequency for example, the distance between the metal resonators connecting rod 702 of radio-frequency filter 700 can be reduced.If so, stationary window connecting rod 705 some difficulty of possibility, and the diameter of the top 755b of window connecting rod 705 may be littler than the diameter of its middle part 755a, as shown in figure 10.
Tuning screw 703a is fixed on the upper end of metal shell 701 and their end and can or be positioned in the tuned window 725 of metal resonators connecting rod 702 facing to the upper surface of metal resonators connecting rod 702.Tuning screw 703a is used for the resonance characteristic of tuned radio frequency filter 700.In other words, according to the distance between tuning screw 703a and the metal resonators connecting rod 702, the resonance frequency of tuned radio frequency filter 700.
Each coupling screw 703b all is placed between two adjacent metal resonator connecting rods 702.Therefore, the preferred adjacent window apertures connecting rod 705 of coupling screw 703b is provided with.Coupling screw 703b also is fixed on the coupling window 713b, and this window is formed between the other end of the other end of metal shell 701 and dividing plate 713a.Coupling screw 703b is used for the coupled characteristic between tuning two adjacent metal resonator connecting rods 702.Coupling screw 703b has the structure identical with tuning screw 703a, except they are longer than the latter.
One end of front end housing 704a sealing metal shell 701.This front end housing 704a has input connector 743a and out connector 743b.Input and output connector 743a, 743b link to each other with adjacent metal resonator connecting rod 702 with outlet terminal coupling copper cash 745b via input terminal coupling copper cash 745a respectively.Front end housing 704a has fixture 741a, and this fixture extends and has a shape corresponding to the projection 715a of metal shell 701 from the outer surface of front end housing.Fixing hole 741a has through hole 741b thereon, and screw 749 passes among the fixing hole 715b that this through hole is fixed on projection 715a, so that fixing front end housing 704a.Fixing hole also can be formed on the end of dividing plate 713a.Front end housing 704 can have corresponding through hole then.
The other end of rear end cap 704b sealing metal shell 701.This rear end cap 704b has fixture 741a, and this fixture extends and has a corresponding shape with the projection 715a of metal shell 701 from the outer surface of rear end cap.Fixing hole 741a has through hole 741b thereon, and screw 749 passes among the fixing hole 715b that this through hole is fixed on projection 715a, so that fixing rear end cap 704b.
Simultaneously, according to the structure of radio-frequency filter 700, input and output connector 743a, 743b may form in some different mode.Radio-frequency filter 700 as shown in Figure 7 has following structure: wherein, three pairs of metal resonators connecting rods 702 are arranged in two rows, and metal shell 701 has output and input connector 743a, 743b in its end.Yet according to the characteristic (for example, frequency band) of system's needs that product is used, metal resonators connecting rod 702 may be greater or lesser than said structure.For example, if three metal resonators connecting rods 702 are in line, spatial accommodation 711a, the 711b of metal shell 701 can form single space.Then, input connector 743a is positioned on the front end housing 704a, and out connector 743b is positioned on the rear end cap 704b.Carrying out this change in the design of radio-frequency filter 700 is readily appreciated that to those skilled in the art.
As shown in Figure 7, according to a preferred embodiment of the invention, radio-frequency filter 700 has identical equivalent electric circuit with as shown in Figure 1 radio-frequency filter 100.To have the operation of the radio-frequency filter 700 of structure as mentioned above by describing with reference to figure 6.
In radio-frequency filter 700, input terminal coupling copper cash 745a and outlet terminal coupling copper cash 745b provide inductance coupling high 52,58.Metal resonators connecting rod 702 and metal shell 701 have been formed parallel LC resonant circuit 10-15, and its resonance characteristic (for example, resonance frequency) is undertaken tuning by tuning screw 703a.Between each resonant circuit 10-15, multi-form inductance or the following setting of capacitive coupling 53-57: inductance or capacitive coupling between each adjacent metal resonator connecting rod 702; Inductance or capacitive coupling between metal resonators connecting rod 702 and the metal shell 701; And inductance or capacitive coupling between window connecting rod 705 and adjacent metal resonator 702 or metal shell 701.The coupled characteristic of inductance or capacitive coupling 53-57 is tuning by coupling screw 703b.Especially, the resonance frequency of each parallel LC resonant circuit 10-15 is all tuning by tuning screw 703a, and the coupled characteristic between each parallel LC resonant circuit 10-15 all to be coupled screw 703b tuning.
If radio frequency signals is applied to the input connector 743a of radio-frequency filter 700, the electric current input terminal coupling copper cash 745a that flows through, and form electromagnetic energy.Electromagnetic energy is sent to parallel LC resonant circuit 10, and it is made up of metal resonators connecting rod 702, metal shell 701 etc.Frequency is sent to next contiguous parallel LC resonant circuit 11, residual components ground connection G corresponding to the electromagnetic energy energy component of the resonance frequency of parallel LC resonant circuit 10.According to the structural relation between metal resonators connecting rod 702, metal shell 701 and the window connecting rod 705, between the parallel LC resonant circuit 10 parallel LC resonant circuit 11 adjacent, form inductance or capacitive coupling 53, so that the transmitted frequency energy with the next one.In other words, the frequency of being filtered by parallel LC resonant circuit 10 can be sent in the next adjacent parallel LC resonant circuit 11 via inductance between resonant circuit 10 and resonant circuit 11 or capacitive coupling 53.
By top program, resonance frequency can be sent to resonant circuit 15 corresponding to the frequency of the resonance frequency of resonant circuit 10-15, and this circuit links to each other with outlet terminal coupling copper cash 745b.The frequency that is transmitted afterwards can rely on the inductance coupling high 58 of outlet terminal coupling copper cash 745b to produce electric current.Therefore, have only resonance frequency to be output to out connector 743b corresponding to the signal of the resonance frequency of resonant circuit 10-15.
Figure 11 is a perspective view of describing the fractionation of radio-frequency filter 800 according to a further advantageous embodiment of the invention, and its shell is partly split so that explain.
As shown in figure 11, radio-frequency filter 800 comprises: shell 801; The fixed frame 802 of the window connecting rod 825 that has metal resonators connecting rod 821 and extend continuously; Front end housing 804a; With rear end cap 804b.
Shell 801 has spatial accommodation 811a and 811b, and this spatial accommodation is open along longitudinal extension and its corresponding end of shell.Spatial accommodation 811a, 811b are divided into two spaces by the dividing plate 813a along shell 801 longitudinal extensions.The end of dividing plate 813a and an end in contact of shell 801, the other end of the other end of dividing plate 813a and shell 801 keeps predetermined distance.Therefore, the space that limits between the other end of the other end of shell 801 and dividing plate 813a communicates with each other spatial accommodation 811a, the 811b of two separations.Simultaneously, coupling screw 803b is fixed in the space between the other end of the other end of dividing plate 813a and shell 801, so that the coupled characteristic between spatial accommodation 811a, the 811b of tuning two separations.Coupling screw 803b can be fixed to the bottom surface of contiguous spatial accommodation 811a, 811b from the upper end of shell 801.
Shell 801 is made by metal material usually, but if necessary also can be made by synthetic resin.According to the characteristic of radio-frequency filter 800, when shell is made by synthetic resin, can plate metallic paint on its surface.
Have as above the metal shell 801 of structure and can utilize extruding to make, because it is by forming along spatial accommodation 811a, the 811b of its longitudinal extension and dividing plate 813a.Compare with the casting of the high accuracy of for example die casting and the processing method of for example grinding, the advantage of extrusion process is that it can make the production product reduce cost and need not to consider product quantity.By extruding, at first metal shell is made framework.The cut framework make it become the metal shell that meets final specification length, and it is provided with fixing hole, screw etc. subsequently.If necessary, spatial accommodation 811a, the 811b of shell 801 can be separated into two spaces by dividing plate 813a.Perhaps, they also can form single space, and are not separated.
Fixed frame 802 is along the longitudinal extension of shell 801 and be fixed on the bottom surface of spatial accommodation 811a, 811b.Fixed frame 802 as shown in figure 11 for example relies on, and the fixed form of screw is fixed on the bottom surface of spatial accommodation 811a, 811b.Yet, if necessary, can on the bottom surface of spatial accommodation 811a, 811b, form the slit of reservation shape and make its longitudinal extension along spatial accommodation, also can form guide rail in the lower end of fixed frame 802 with the respective shapes that can insert slit.Perhaps, slit can be formed on the lower surface of fixed frame 802, and guide rail can be formed on the basal surface of spatial accommodation 811a, 811b.
Metal resonators connecting rod 821 extends from fixed frame 802 along a direction and is formed with screw 823 at small end.The specification required according to radio-frequency filter 800 can change the quantity of metal resonators connecting rod 821.Dish 805 is fixed on the upper end of metal resonators connecting rod 821.For this reason, dish 805 threaded rod 851 that have corresponding to screw 823, described screw is formed on the upper end of metal resonators connecting rod 821.Dish 805 also has tuned window 853, the recessed predetermined degree of depth in this Kong Congqi other end.Preferably, dish 805 is spaced a predetermined distance from the upper surface of spatial accommodation 811a, 811b.
Window connecting rod 825 is 802 extensions along the direction identical with the bearing of trend of metal resonators connecting rod 821 from fixed frame, and have the screw 827 that formation is gone up in the top.Measure from the lower end of fixed frame 802, the upper end height of window connecting rod 825 is corresponding with the height of spatial accommodation 811a, 811b.If necessary, the height of window connecting rod 825 can omit screw 827 then less than the height of spatial accommodation 811a, 811b.
Metal resonators connecting rod 821 and window connecting rod 825 vertically being arranged alternately along fixed frame 802.
Metal resonators connecting rod 821 and window connecting rod 825 are integrally formed in respectively on the fixed frame 802, and utilize processing, moulding or extruding to make.If the application extrusion process at first produces the single parts of frame shape, in these parts, form coffin, and it is cut into suitable width so that form fixed frame 802, metal resonators connecting rod 821 and window connecting rod 825.
When fixed frame 802 is positioned on the bottom surface of spatial accommodation 811a, 811b, from the lower surface hold-down screw of shell 801, so that fixed frame 801 is fixed on the bottom surface of spatial accommodation 811a, 811b.In addition, screw 839 can be coupled in the upper end of window connecting rod 825 from the upper surface of shell 801.
Simultaneously, tuning screw 803a is coupled in the upper surface of shell 801, and its position is corresponding with tuned window 853 positions of dish 805.By adjusting their constant depth, with the resonance characteristic of tuning screw 803a tuned radio frequency filter 800.Tuning screw 803a if desired, can be arranged on the end of tuning screw in the tuned window 853 facing to the tuned window 853 among spatial accommodation 811a, the 811b.
One end of front end housing 804a can 801.Front end housing 804a has a pair of coupling copper cash 845.This coupling copper cash 845a be suitable for adjacent metal resonator connecting rod 802 with input or output the connector (not shown) and link to each other.Front end housing 804a for example relies on, and the fixed form of screw is fixed on the end of shell 801.Rear end cap 804b is fixed on the other end of shell 801, so that the sealing spatial accommodation.
Simultaneously, though this is placed on the front end housing 804a coupling copper cash 845, also they can be placed in different positions according to the structure of radio-frequency filter 800.For example, if three metal resonators connecting rods 821 are in line, spatial accommodation 811a, the 811b of shell 801 can form single space.Before the copper cash 845 that is coupled then is placed in respectively and on rear end cap 804a, the 804b.In the design of radio-frequency filter, so adjust to those skilled in the art and will be readily appreciated that.
According to another embodiment of the invention, radio-frequency filter 800 as shown in figure 11 has the equivalent electric circuit identical with radio-frequency filter shown in Figure 1 100.To have the as above operation of the radio-frequency filter 800 of structure by describing with reference to figure 6.
In radio-frequency filter 800, coupling copper cash 845 provides inductance coupling high 52 and 58.Metal resonators connecting rod 821 and shell 801 have been formed parallel LC resonant circuit 10-15, and its resonance characteristic (for example, resonance frequency) is undertaken tuning by tuning screw 803a.Between each resonant circuit 10-15, multi-form inductance or capacitive coupling 53-57 are by following setting: inductance or capacitive coupling between each adjacent metal resonator connecting rod 821; Inductance or capacitive coupling between metal resonators connecting rod 821 and shell 801; And inductance or capacitive coupling between window connecting rod 825 and adjacent metal resonator 821 or shell 801.Change the coupled characteristic of inductance or capacitive coupling 53-57 according to the shape of window connecting rod 825, size etc.According to the characteristic of radio-frequency filter 800, those skilled in the art can easily change the size of window connecting rod 825.
If radio frequency signals is applied to a side of the coupling copper cash 845 of radio-frequency filter 800, can forms electric current and electromagnetic energy so.Electromagnetic energy is sent to the parallel LC resonant circuit of being made up of metal resonators connecting rod 821, shell 801 etc. 10.Frequency is sent to next contiguous parallel LC resonant circuit 11 corresponding to the electromagnetic energy energy component of the resonance frequency of parallel LC resonant circuit 10, and residual components ground connection G.According to the structural relation between metal resonators connecting rod 821, shell 801 and the window connecting rod 825, between the parallel LC resonant circuit 10 parallel LC resonant circuit 11 adjacent, form inductance or capacitive coupling 53, so that the transmitted frequency energy with the next one.In other words, the frequency of being filtered by parallel LC resonant circuit 10 can be sent in the next adjacent parallel LC resonant circuit 11 via inductance between resonant circuit 10 and resonant circuit 11 or capacitive coupling 53.
By top process, the frequency that resonance frequency is met the resonance frequency of resonant circuit 10-15 can be sent to resonant circuit 15, and this circuit links to each other with the opposite side of coupling copper cash 845.The frequency that is transmitted afterwards can rely on the inductance coupling high 58 of coupling copper cash 845 to produce electric current.Therefore, have only the corresponding signal of resonance frequency of resonance frequency and resonant circuit 10-15 to be output to the coupling copper cash.
As mentioned above, radio-frequency filter has metal shell according to the present invention, and it has the spatial accommodation along its longitudinal extension, and its advantage be its make easily and cost lower.Especially, traditional radio-frequency filter is to utilize high-precision die casting or milled processed to make metal shell, and many dividing plates are wherein arranged.Therefore, it has casting cost height or owing to assembles the problem of handling the unit price that increases individual product., according to the present invention, utilize extrusion process that metal shell is made.So, can guarantee the precision of product, and the reduction of the manufacturing cost of radio-frequency filter by unit price reduced also.In addition, have the original form of long framework by the metal shell of extrusion process manufacturing, it is cut and is divided into suitable length and is employed according to the needs of product specification.Can adjust dynamically the specification of product like this.And metal resonators connecting rod and window connecting rod can intactly be arranged in the simple fixed frame, and can easily be installed in the shell like this.On the other hand, according to prior art, when the metal resonators connecting rod is separately fixed on the shell, between window connecting rod and metal resonators connecting rod, may produces range error, and influence resonance characteristic, for example the resonance frequency of radio-frequency filter.,, integrally make metal resonators connecting rod and window connecting rod according to radio-frequency filter of the present invention, and between them or the distance between each metal resonators be fixed.These have stablized the resonance characteristic of radio-frequency filter.
Although by illustrating and described the present invention with reference to certain preferred embodiment, but should be appreciated that those skilled in the art can make various changes on to form and details under the prerequisite that does not break away from the spirit and scope of the invention that is limited by appended claims.
Claims (22)
1. radio-frequency filter comprises:
Shell with spatial accommodation, this space is open along longitudinal extension and its opposite end of shell;
At least two metal resonators connecting rods along vertical arrangement of shell;
Be fixed on the tuning screw on the upper surface of outer cover, an end of this tuning screw is facing to the upper end of the metal resonators connecting rod in the spatial accommodation;
The coupling screw is arranged between the metal resonators connecting rod, and is fixed on the upper surface of shell; With
Be couple on the opposed end of spatial accommodation front and rear cover with the sealing spatial accommodation.
2. radio-frequency filter as claimed in claim 1, wherein the spatial accommodation of shell is separated into two spaces by dividing plate, and this dividing plate extends from an end of shell along the longitudinal.
3. radio-frequency filter as claimed in claim 2, wherein at least two metal resonators connecting rods are set in each of two spatial accommodations that are separated.
4. radio-frequency filter as claimed in claim 2, its median septum provides coupling window, and this coupling window extends to and the other end of the shell position of preset distance at interval, and this coupling window communicates with each other described two spatial accommodations that are separated.
5. radio-frequency filter as claimed in claim 2, wherein coupling window extends to and the other end of the shell position of preset distance at interval, described two spatial accommodations that are separated communicate with each other, and the coupling screw is fixed in the space between the end of the other end of shell and dividing plate.
6. radio-frequency filter as claimed in claim 1, wherein shell is made by metal material.
7. radio-frequency filter as claimed in claim 1 also comprises: many projections, described projection are from the outer surface projection of metal shell, and along the longitudinal extension of metal shell, and its end has fixing hole; And fixture, this fixture extend from the outer surface of front and rear cover respectively, and have the through hole corresponding to fixing hole.
8. radio-frequency filter as claimed in claim 1 also comprises at least one through hole that is formed centrally and is formed on the end of dividing plate and the fixing hole corresponding with described through hole in front end housing.
9. radio-frequency filter as claimed in claim 1 also comprises the dish that radially extends from the outer surface of the end of metal resonators connecting rod.
10. radio-frequency filter as claimed in claim 1 comprises also that from the end of metal resonators connecting rod along the tuned window of the longitudinal extension of connecting rod, the end of tuning screw places this tuned window.
11. radio-frequency filter as claimed in claim 1 also comprises from the lower surface of metal shell being fixed on screw on the lower end of metal resonators connecting rod, so that the metal resonators connecting rod is fixed on the bottom surface of spatial accommodation.
12. radio-frequency filter as claimed in claim 1 also comprises at least one window connecting rod, this window connecting rod is positioned between the metal resonators connecting rod, extends to its upper surface from the bottom surface of spatial accommodation, and facing to the coupling screw.
13. radio-frequency filter as claimed in claim 12, wherein the window connecting rod has threaded portion, this threaded portion is formed on the outer surface of window connecting rod lower end, and be fixed on the lower surface of metal shell, and, described filter also comprises from the upper surface of metal shell and is fixed to screw on the upper end of window connecting rod, so that the window connecting rod is being fixed in the spatial accommodation.
14. radio-frequency filter as claimed in claim 12, wherein the window connecting rod has top, and predetermined length is extended on this top, and its diameter is littler than the diameter at its middle part.
15. a radio-frequency filter comprises:
Shell with spatial accommodation, this spatial accommodation are along the longitudinal extension of shell, and its opposite end is open;
Be fixed on the bottom surface of spatial accommodation of shell and along the fixed frame of the longitudinal extension of shell;
At least one extends upward the metal resonators connecting rod of predetermined altitude from described fixed frame; With
Be couple on each spatial accommodation corresponding end to seal the front and rear cover of spatial accommodation.
16. radio-frequency filter as claimed in claim 15 also comprises the dish that the fixing hole that extends from the upper surface of metal resonators connecting rod and surface have screw thread downwards, this dish is fixed in the described fixing hole.
17. radio-frequency filter as claimed in claim 15, wherein spatial accommodation is separated at least two spaces by dividing plate, and this dividing plate is along the longitudinal extension of spatial accommodation.
18. radio-frequency filter as claimed in claim 17, wherein fixed frame is fixed in each of described two spatial accommodations that are separated at least.
19. radio-frequency filter as claimed in claim 17, its median septum extends to and the other end of the shell position of preset distance at interval, thereby at least two spatial accommodations that are separated are communicated with each other, and described filter also comprise from the upper surface of shell and fix and be arranged on the other end of shell and the coupling screw between the dividing plate end.
20. radio-frequency filter as claimed in claim 15, wherein shell is caused by metal material.
21. radio-frequency filter as claimed in claim 15 also comprises the tuning screw that is fixed on the upper surface of outer cover, and the end of this screw is facing to the upper end of the metal resonators connecting rod in the spatial accommodation.
22. radio-frequency filter as claimed in claim 15, wherein said filter comprise that also at least one extends upward the window connecting rod of predetermined altitude from fixed frame, and, described metal resonators connecting rod and window connecting rod vertically being arranged alternately along fixed frame.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR32293/03 | 2003-05-21 | ||
| KR32293/2003 | 2003-05-21 | ||
| KR10-2003-0032293A KR100489698B1 (en) | 2003-05-21 | 2003-05-21 | Radio frequency filter |
| KR38549/2003 | 2003-06-14 | ||
| KR1020030038549A KR20040107892A (en) | 2003-06-14 | 2003-06-14 | Radio frequency filter |
| KR38549/03 | 2003-06-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1574627A true CN1574627A (en) | 2005-02-02 |
| CN100544198C CN100544198C (en) | 2009-09-23 |
Family
ID=33479053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100766290A Expired - Fee Related CN100544198C (en) | 2003-05-21 | 2004-05-21 | Radio-frequency filter |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100544198C (en) |
| WO (1) | WO2004105173A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102077411A (en) * | 2008-06-27 | 2011-05-25 | Ace技术株式会社 | Resonator manufacturing method for RF filter and RF filter with the resonator |
| CN103117437A (en) * | 2011-11-17 | 2013-05-22 | 成都赛纳赛德科技有限公司 | Miniaturization filter |
| CN108631030A (en) * | 2017-03-22 | 2018-10-09 | Ace技术株式会社 | RF filters for improving PIMD performances |
| WO2019200604A1 (en) * | 2018-04-20 | 2019-10-24 | Nokia Shanghai Bell Co., Ltd. | Filter apparatus, method |
| CN110559558A (en) * | 2019-08-19 | 2019-12-13 | 南京从景生物技术有限公司 | Novel radio frequency emission source |
| CN114365347A (en) * | 2019-09-13 | 2022-04-15 | 千叶正毅 | High frequency filter |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016096168A1 (en) * | 2014-12-15 | 2016-06-23 | Commscope Italy S.R.L. | In-line filter having mutually compensating inductive and capacitive coupling |
| US10122061B2 (en) | 2015-12-04 | 2018-11-06 | Telefonaktiebolaget Lm Ericsson (Publ) | Coaxial resonator with dielectric tip |
| FI128047B (en) * | 2017-03-06 | 2019-08-30 | Tongyu Tech Oy | Frame structure for a RF filter and method producing the same |
| FR3079673A1 (en) | 2018-04-03 | 2019-10-04 | Ergosup | METHOD AND DEVICE FOR ELECTROCHEMICALLY ELECTRICALLY STORING AND GENERATING ELECTRICITY FROM GASEOUS HYDROGEN, KIT COMPRISING SAID DEVICE AND CONSUMABLES |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5023579A (en) * | 1990-07-10 | 1991-06-11 | Radio Frequency Systems, Inc. | Integrated bandpass/lowpass filter |
| US5990763A (en) * | 1996-08-05 | 1999-11-23 | Adc Solitra Oy | Filter having part of a resonator and integral shell extruded from one basic block |
| FI113578B (en) * | 1999-03-03 | 2004-05-14 | Filtronic Lk Oy | resonator filter |
-
2004
- 2004-05-13 WO PCT/KR2004/001120 patent/WO2004105173A1/en active Application Filing
- 2004-05-21 CN CNB2004100766290A patent/CN100544198C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102077411A (en) * | 2008-06-27 | 2011-05-25 | Ace技术株式会社 | Resonator manufacturing method for RF filter and RF filter with the resonator |
| CN103117437A (en) * | 2011-11-17 | 2013-05-22 | 成都赛纳赛德科技有限公司 | Miniaturization filter |
| CN108631030A (en) * | 2017-03-22 | 2018-10-09 | Ace技术株式会社 | RF filters for improving PIMD performances |
| CN108631030B (en) * | 2017-03-22 | 2020-05-19 | Ace技术株式会社 | RF filter for improved PIMD performance |
| WO2019200604A1 (en) * | 2018-04-20 | 2019-10-24 | Nokia Shanghai Bell Co., Ltd. | Filter apparatus, method |
| CN110559558A (en) * | 2019-08-19 | 2019-12-13 | 南京从景生物技术有限公司 | Novel radio frequency emission source |
| CN114365347A (en) * | 2019-09-13 | 2022-04-15 | 千叶正毅 | High frequency filter |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2004105173A1 (en) | 2004-12-02 |
| CN100544198C (en) | 2009-09-23 |
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