CN103035988A - Adjustable filter device - Google Patents
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- CN103035988A CN103035988A CN2011103056965A CN201110305696A CN103035988A CN 103035988 A CN103035988 A CN 103035988A CN 2011103056965 A CN2011103056965 A CN 2011103056965A CN 201110305696 A CN201110305696 A CN 201110305696A CN 103035988 A CN103035988 A CN 103035988A
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Abstract
The invention discloses an adjustable filter device which mainly comprises a metal shell, a filter arranged on the metal shell and at least one frequency-modulating screw in threaded connection with the metal shell, wherein the filter is provided with an insulating plate and two metal layers, the two metal layers are arranged on the top face of the insulating plate and the bottom face of the insulating plate and are electrically conducted with each other through a plurality of through holes penetrating through the insulating plate, a plurality of resonators and a frame surrounding the plurality of resonators are formed by the two metal layers and the plurality of the through holes, a resonant cavity is formed between two adjacent resonators and a resonant cavity is formed between each resonator and the frame. The resonant cavities are capable of filtering unnecessary impure signals by generating resonance in the process of signal transmission, and the frequency-modulating screw can move relative to the filter according to usage requirements, so as to adjust the resonant frequency of the filter.
Description
Technical field
The present invention relates to filter field, particularly a kind of adjustable filter device.
Background technology
In order to improve the quality of wireless telecommunications, usually can process the high-frequency signal receive by a band pass filter (bandpass filter), not only can the unnecessary interference signal of filtering, can allow high-frequency signal have the good quality of reception simultaneously.High efficiency band pass filter then is the factor of major decision communication quality, also is high selectivity (selectivity) and is inserted into the filter of loss (insertion loss); Wherein, high selectivity means the inhibition ability of other wavestrip (side band) fairly good, can dwindle the buffer zone (guard band) between adjacent channel, the situation that frequency is used is more efficient, for judging filter quality factor (Quality factor, Q) key, and insertion loss means signal through the attenuation degree of filtering, the conductor that is caused by the surface impedance of conductor own consumes, dielectric consume and the factors such as radiation consume of signal electromagnet ripple on the space that conductor periphery dielectric material causes determine attenuation degree, and the filter that is inserted into loss can make the better high frequency receiving gain of signal acquisition.
With regard to the mechanical filter of high Q value (such as comb filter), it mainly is the multistage three-dimensional resonator that the metal with the tool specific thicknesses is made, so just can utilize the high-quality factor (Quality factor) of the low dielectric consume of the low surface impedance of metal itself and ambient air medium, suppress ability and be inserted into loss and make the signal filtering process obtain good other ripple; But the filter of all-metal material needs a large amount of metal materials to cooperate complicated mould to mold multistage resonant body in manufacturing, thereby except expending higher cost, also can have sizable volume because thickness itself is too thick, be as good as sizable circuit space that to account in the application for integrated circuit module.
In order to reduce manufacturing cost and to reduce volume, the microstrip line flat filter (microstrip filter) made from Copper Foil on printed circuit board (PCB) is arranged then, such as fourchette type microstripline filter (Inter-digital filter), edge manifold type microstripline filter (Edge coupled micro-strip filter) and hairpin-line bandpass filter (Hairpin filter) etc., in addition in " Microwave filters; Impedance-matching networks; and Coupling structures " book of publishing in November, 1985 in Christian era the 625th page expose a kind of filter, its structure is shown in the FIG.10.06-7 of the document, mainly be on the surface of filter circuit plate one deck Copper Foil to be set, and adopt the design of fourchette shape to filter the high-frequency signal that receives, but the metal resonant body thickness of the filter that forms with this planar metal manufacturing is excessively thin, make signals transmission cause the conductor consume by the high surface resistance factor of conductor, and be subject to the dielectric consume impact of printed circuit board (PCB) in the signal transmission, cause filter itself to be difficult to obtain high Q value, thereby can cause filter the problems such as other ripple inhibition ability variation and insertion loss raising to occur.
Summary of the invention
Main purpose of the present invention is to provide a kind of adjustable filter device, and its volume is little and can reduce manufacturing cost, and has high Q value and can obtain preferably that other ripple suppresses ability and lower passband loss, can reduce again the conductor consume simultaneously.
In order to reach above-mentioned purpose, adjustable filter device of the present invention includes a metal shell, one filter, and a plurality of frequency modulation screws, wherein: this filter is located in this metal shell and is had an insulation board and two metal levels, this two metal level is located at respectively the top of this insulation board, two sides, the end and run through the perforation of this insulation board and mutually electrically conduct via a plurality of, this two metal level and this a plurality of perforations form a plurality of resonant bodies and are looped around these a plurality of resonant bodies frame on every side, these a plurality of resonant bodies have identical pattern in the two sides of this insulation board, these a plurality of resonant bodies present to be parallel to each other and are set up in parallel and perpendicular to two relative sides of this frame, form one first resonant cavity between adjacent two these resonant bodies, respectively this resonant body is to be electrically connected with the wherein side of this frame, and be separated by a preset distance and form respectively one second resonant cavity with another side of this frame, this frame has two openings in wherein at least one mask of this insulation board, be positioned at outermost two these resonant bodies and extend an input end and an output end towards this two opening respectively, use for signal input and output; These a plurality of frequency modulation screw spiral shells are located at this metal shell and can be moved with its terminal second resonant cavity relative to this filter respectively, in order to adjust the resonance frequency of this filter.
The preferably, this metal shell has a base and a loam cake that interfixes, and this filter is fixed between this base and this loam cake, and respectively this frequency modulation screw spiral shell is located at this loam cake.More preferably, this frame is equipped with a plurality of fixing holes, can mutually lock for base and the loam cake of fixed screw with this frame and metal shell is set.Perhaps, these a plurality of perforations are located at this a plurality of resonant bodies, and this two metal level is provided with a plurality of metal fixings in this frame, and these a plurality of metal fixings mutually lock the base of this frame and metal shell and loam cake and mutually electrically conduct.
Another preferably, the same side of respectively this resonant body of this filter and this frame is electrically connected.Perhaps, adjacent two these resonant bodies of this filter are electrically connected with wherein two relative sides of this frame respectively.More preferably, a wherein side of this frame is provided with this two opening simultaneously.Perhaps, wherein two relative sides of this frame are parallel to each other with these a plurality of resonant bodies and are respectively equipped with this two opening.Perhaps, this input end and this output end are extended towards this two opening respectively in the opposite direction by two these resonant bodies.Perhaps, respectively this first resonant cavity is Openworks shape, and respectively formed the second resonant cavity has this local insulation board between two relative sides of the end of this resonant body and this frame.More preferably, in addition parallel these a plurality of resonant bodies of two relative sides of this frame and and outermost two these resonant bodies between form respectively second resonant cavity that is Openworks shape.
For reaching above-mentioned purpose, another kind of adjustable filter device of the present invention includes a metal shell, a filter, and a frequency modulation screw, and wherein: formation one screw is run through in a side of this metal shell; This filter is located at this metal shell over against a side of this screw, and have an insulation board and two metal levels, this two metal level is located at respectively the top of this insulation board, two sides, the end and run through the perforation of this insulation board and mutually electrically conduct via a plurality of, this two metal level and this a plurality of perforations form a plurality of resonant bodies and are looped around these a plurality of resonant bodies frame on every side, these a plurality of resonant bodies have identical pattern in the two sides of this insulation board, these a plurality of resonant bodies are the array-like setting and have 2 first adjacent resonant bodies and 2 second adjacent resonant bodies, between this 2 first resonant body, between this 2 second resonant body and this adjacent first resonant body and this second resonant body among form one first resonant cavity, wherein between this first resonant body and this frame and wherein this second resonant body and this frame among form 2 second resonant cavitys, this frame has two openings in wherein at least one mask of this insulation board, another this first resonant body and another this second resonant body extend an input end and an output end towards this two opening respectively, use for signal input and output; This frequency modulation screw spiral shell is located in the screw of this metal shell and can be moved relative to the resonant body of this filter, in order to adjust the resonance frequency of this filter.
The preferably, the frame of this filter aligns with a bottom margin of this metal shell, and this metal shell covers thereon and electrical contact with it along this frame.More preferably, these a plurality of perforations are located at this a plurality of resonant bodies, and this two metal level is provided with a plurality of metal fixings in this frame, and these a plurality of metal fixings mutually lock this frame and this metal shell and mutually electrically conduct.
Another preferably, the first resonant cavity between this 2 first resonant body and this 2 second resonant body is Openworks shape, and respectively this second resonant cavity between this resonant body and this frame has this local insulation board.
In each adjustable filter device provided by the present invention, the preferably, this input end and output section are positioned at the same face of this frame, and the another side of this frame is continuously extension along the periphery of insulation board.
Another preferably, this insulation board is made with glass fibre or ceramic material, respectively this metal level and this a plurality of perforations are made with identical conductive material.More preferably, this insulation board is that the compound glass fiber board is made, and respectively this metal level and this a plurality of perforations are made with the material of copper or copper alloy.
Comprehensive as can be known above-mentioned, adjustable filter device of the present invention utilizes printed circuit technique to make inner filter, can allow whole volume reduce and the reduction manufacturing cost, and have suitable thickness and can obtain high Q value, suppress ability and lower passband loss to increase other ripple, again by the design of these a plurality of perforations, can effectively reduce conductor losses in addition.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the stereogram of the present invention's the first preferred embodiment;
Fig. 2 is the three-dimensional exploded view of the present invention's the first preferred embodiment;
Fig. 3 is analogous to Fig. 2, shows that mainly the first resonant cavity is Openworks shape;
Fig. 4 is analogous to Fig. 3, mainly shows the different arrangement modes of the resonant body of filter;
Fig. 5 is the three-dimensional exploded view of the present invention's the second preferred embodiment;
Fig. 6 is the frequency response characteristic figure of mechanical filter;
Fig. 7 is provided the frequency response characteristic figure of adjustable filter device with Fig. 4 for the present invention.
Wherein, Reference numeral
" the first embodiment "
10 adjustable filter devices, 20 metal shells
22 bases, 24 loam cakes
26 fixed screws, 30,30 ' filter
31 fixing holes, 32 insulation boards
33 metal levels, 332 resonance patterns
334 frame patterns, 336 perforations
338 open 34 resonant bodies
35 frames, 36 first resonant cavitys
37 second resonant cavitys, 38 input ends
39 output ends, 40 frequency modulation screws
" the second embodiment "
50 adjustable filter devices, 60 metal shells
62 screws, 70 filters
71 insulation boards, 72 metal levels
722,724 first resonant bodies 726,728 second resonant bodies
73 frames, 74 first resonant cavitys
75 second resonant cavitys, 76 input ends
77 output ends, 80 frequency modulation screws
Embodiment
In order to describe structure of the present invention, feature and effect place in detail, hereby enumerate a plurality of preferred embodiments and cooperate following description of drawings such as rear.
See also Fig. 1 and Fig. 2, be the adjustable filter device 10 that the present invention's the first preferred embodiment provides, include a metal shell 20, a filter 30, and a plurality of frequency modulation spiral shell 40.
The periphery of filter 30 has a plurality of fixing holes 31, uses for these a plurality of fixed screws 26 and passes, so that filter 30 is fixed between the base 22 and loam cake 24 of metal shell 20.Filter 30 has an insulation board 32 and two metal levels 33, the material of insulation board 32 can be glass fibre or the ceramic material of single or multiple lift, wherein take the compound glass fiber board as most preferred embodiment, each metal level 33 is made and take the material of copper or copper alloy as most preferred embodiment by conductive material.This two metal level 33 is located at respectively top, the two sides, the end of insulation board 32, each metal level 33 has a plurality of resonance patterns 332 and is looped around these a plurality of resonance patterns 332 frame pattern 334 on every side, each corresponding resonance pattern 332 of this two metal level 33 runs through the perforation 336 of insulation board 32 and mutually electrically conducts via a plurality of, and forms resonant bodies 34 with these a plurality of perforations 336.What each frame pattern 334 of this two metal level 33 can present embodiment provides is electrically conducted mutually by these a plurality of perforations 336, and form frames 35 with these a plurality of perforations 336, metal shell 20 set fixed screws 26 are to pass these a plurality of fixing holes 31 of being located at frame 35, so that the periphery of filter 30 and the base 22 of this metal shell 20 are locked mutually with loam cake 24; Perhaps, these a plurality of perforations 336 only correspondence are located at resonant body 34, and make this two metal level 33 on frame pattern 334, wear above-mentioned fixing hole 31 through insulation board 32, by these a plurality of fixed screws 26 or any metal fixing and 20 assemblings of this metal shell, equally can with the frame pattern 334 of this two metal level 33 respectively with the base 22 and loam cake 24 direct electrical contacts of metal shell 20, and mutually electrically conduct by fixed screw 26, thereby formed a frame of common-battery position by frame pattern 334 and fixed screw 26.
In the present embodiment, these a plurality of resonant bodies 34 present to be parallel to each other and are set up in parallel, and perpendicular to two long sides of frame 35 and two short sides of parallel frame 35, so that form one first resonant cavity 36 between adjacent two resonant bodies 34, each resonant body 34 is that the same long side with frame 35 is electrically connected, and is separated by a preset distance and forms respectively one second resonant cavity 37 with another long side of frame 35; In addition, the frame pattern 334 that is positioned at insulation board 32 bottom surfaces is continuously along the periphery of insulation board 32 and extends, a wherein long side that is positioned at the frame pattern 334 of insulation board 32 end faces has two openings 338 simultaneously, be positioned at outermost two resonant bodies 34 and extend an input end 38 and an output end 39 towards this two opening 338 respectively, use for signal input and output.By this, when high-frequency signal after the input of input end 38, just can be via the coupled resonance between these a plurality of resonant bodies 34, cooperate the second resonant cavity 37 that consists of with frame 35, obtain best signal gain and other ripple and suppress frequency range, to filter out unnecessary signal, at last again by 39 outputs of output end.What this need to remark additionally be, the design of this two opening 338 mainly is to consider filter 30 applied forward and backward level circuit structures, not necessarily to be located at the same side of the same face of frame 35, also can be arranged on the different sides of the same face of frame 35, input end 38 and output end 39 are extended respectively in the opposite direction by outermost two resonant bodies 34, for example this two opening 338 is located at respectively on two long sides or two short sides of frame 35.
Each frequency modulation screw 40 spiral shell be located at metal shell 60 loam cake 24 and can be respectively with its terminal near or away from the second resonant cavity 36 of filter 30, in order to the resonance frequency that changes filter 30 and the frequency range scope of filter 30, can filtering nearer other wavestrip and dwindle buffer zone between adjacent channel, produce comparatively precipitous decay, to reach higher Q value, thereby having splendid outer frequency inhibition ability, the situation that frequency is used is more efficient; Can change simultaneously the equivalent capacity size of the second resonant cavity 37, the frequency characteristic of adjustable filter 30 and allow signal from inputting end 38 so that output end 39 all maintains extremely low reflection consume, make filter 30 have good impedance matching property, and then the communication quality of lifting high-frequency signal, allow the filter 30 of present embodiment have the feature that almost is equal to mechanical high Q value and is inserted into consume.
In order to reduce the dielectric consume that insulation board 32 produces and more to improve whole Q value, SI semi-insulation plate 32 can be excavated, allow formed the first resonant cavity 36 is Openworks shape between adjacent two resonant bodies 34, keep local insulation board 32 between the end of each resonant body 34 and the frame 35 and allow the second resonant cavity 37 keep non-Openworks shape and allow, as shown in Figure 3, and, form respectively the second resonant cavity 37 that is Openworks shape between two short sides of frame 35 and outermost two resonant bodies 34; On the other hand, the circuit structure of filter provided by the present invention does not limit the hairpin-type bandwidth-limited circuit such as above-mentioned embodiment, any microstripline filter of can printed circuit making all can be used such as above-mentioned filter 30 mentioned technical characterictics and reach the functional character that adjustable filter device of the present invention has, as shown in Figure 4, it is the filter 30 ' that a fourchette type microstrip line printed circuit is made, only be with the difference of filter that above-described embodiment provides 30, adjacent two resonant bodies 34 connect respectively two relative long sides of frame 35, are set up in parallel so that these a plurality of resonant bodies 34 present interlacedly.
Please consult again Fig. 5, be the adjustable filter device 50 that the present invention's the second preferred embodiment provides, have equally a metal shell 60, a filter 70, and a frequency modulation screw 80.The place different from above-described embodiment is filter 70 for having the multistage coupled resonance form of electric coupling, magnetic coupling and electromagnetic coupled, take multistage serial connection C shape transmission line structure as example, and the multistage coupling filter of four string datas that namely exemplifies just like present embodiment.Below be described in further detail for each structure of this filter 70:
These two metal levels, 72 formed these a plurality of resonant bodies are the array-like setting and divide into 2 first resonant bodies 722,724 and 2 second resonant bodies 726,728, and wherein adjacent this first resonant body 722 and this second resonant body 726 extend an input end 76 and an output end 77 towards this frame 73 in the opposite direction; Form respectively one first resonant cavity 74 between each first resonant body 722,724, between each second resonant body 726,728 and between the first adjacent resonant body 722, the 724 and second resonant body 726,728, form respectively one second resonant cavity, 75, the first resonant bodies 724 and the second resonant body 728 and frame 73 amongs between the first resonant body 722 and the second resonant body 726 and the frame 73 and form 2 second resonant cavitys 75.More cooperate and lower in the dielectric consume consideration, make this 2 first resonant body 722,724 and this 2 second resonant body 726,728 between each first resonant cavity 74 be Openworks shape, and the first resonant body 722,724 and frame 73 between and the second resonant body 726,728 with wherein one second resonant cavity 75 of frame 73 amongs formation be Openworks shape, as shown in Figure 5.By this, when signal is inputted from input end 76, can be by multistage electricity, magnetic coupling resonance, to reach the purpose of trap signal between these a plurality of resonant bodies 722～728.
See also such as Figure 6 and Figure 7, be respectively the frequency response characteristic of making existing machinery formula filter and the present invention's adjustable filter device 30 ' shown in Figure 4 with fourchette type filter circuit construction, insertion consume curve S 21, S21 ' by both can find out that obviously the filter apparatus that the present invention makes with plane electric circuit has the other ripple that is equal to mechanical filter and suppresses ability and lower passband loss.Comprehensive the above, adjustable filter device of the present invention is except frequency range that can adjustment itself and reach the filter effect of high selectivity and low insertion loss, utilize simultaneously printed circuit technique to make inner filter, allow the volume of integral body reduce and effectively reduce manufacturing cost, and under suitable thickness, pass through the design of these a plurality of perforations, allow and have lower resistance value between two metal levels of mutual conduction, the conductor losses of signal transmission from one channel to another filter resonance body inside be can effectively reduce, ability and lower passband loss suppressed to increase other ripple; If also cooperate to remove the structure of SI semi-insulation plate, can more reduce the signal transmission through the dielectric consume of filter, thereby have and level off to the high Q value characteristic of mechanical filter, to have best other ripple inhibition ability and the signal transmission quality of lower passband loss.
Certainly; the present invention also can have other various embodiments; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (18)
1. an adjustable filter device is characterized in that, includes:
One metal shell;
One filter, be located in this metal shell and have an insulation board and two metal levels, this two metal level is located at respectively the top of this insulation board, two sides, the end and run through the perforation of this insulation board and mutually electrically conduct via a plurality of, this two metal level and this a plurality of perforations form a plurality of resonant bodies and are looped around these a plurality of resonant bodies frame on every side, these a plurality of resonant bodies have identical pattern in the two sides of this insulation board, these a plurality of resonant bodies present to be parallel to each other and are set up in parallel and perpendicular to two relative sides of this frame, form one first resonant cavity between adjacent two these resonant bodies, respectively a wherein side of this resonant body and this frame is electrically connected, and be separated by a preset distance and form respectively one second resonant cavity with another side of this frame, this frame has two openings in wherein at least one mask of this insulation board, is positioned at outermost two these resonant bodies and extends an input end and an output end towards this two opening respectively; And
A plurality of frequency modulation screws, spiral shell are located at this metal shell and can be moved with its terminal second resonant cavity relative to this filter respectively, in order to adjust the resonance frequency of this filter.
2. adjustable filter device according to claim 1 is characterized in that, this metal shell has a base and a loam cake that interfixes, and this filter is fixed between this base and this loam cake, and respectively this frequency modulation screw spiral shell is located at this loam cake.
3. adjustable filter device according to claim 2 is characterized in that, this frame is equipped with a plurality of fixing holes, can mutually lock for base and the loam cake of fixed screw with this frame and metal shell is set.
4. adjustable filter device according to claim 2, it is characterized in that, these a plurality of perforations are located at this a plurality of resonant bodies, this two metal level is provided with a plurality of metal fixings in this frame, and these a plurality of metal fixings mutually lock the base of this frame and metal shell and loam cake and mutually electrically conduct.
5. adjustable filter device according to claim 1 is characterized in that, the same side of respectively this resonant body of this filter and this frame is electrically connected.
6. adjustable filter device according to claim 1 is characterized in that, adjacent two these resonant bodies of this filter are electrically connected with wherein two relative sides of this frame respectively.
7. according to claim 5 or 6 described adjustable filter devices, it is characterized in that a wherein side of this frame is provided with this two opening simultaneously.
8. according to claim 5 or 6 described adjustable filter devices, it is characterized in that wherein two relative sides of this frame are parallel to each other with these a plurality of resonant bodies and are respectively equipped with this two opening.
9. according to claim 5 or 6 described adjustable filter devices, it is characterized in that this input end and this output end are extended towards this two opening respectively in the opposite direction by two these resonant bodies.
10. according to claim 5 or 6 described adjustable filter devices, it is characterized in that respectively this first resonant cavity is Openworks shape, respectively formed the second resonant cavity has this local insulation board between two relative sides of the end of this resonant body and this frame.
11. adjustable filter device according to claim 10 is characterized in that, in addition parallel these a plurality of resonant bodies of two relative sides of this frame and and outermost two these resonant bodies between form respectively second resonant cavity that is Openworks shape.
12. an adjustable filter device is characterized in that, includes:
One metal shell runs through formation one screw from the one side;
One filter, be located at this metal shell over against a side of this screw, and have an insulation board and two metal levels, this two metal level is located at respectively the top of this insulation board, two sides, the end and run through the perforation of this insulation board and mutually electrically conduct via a plurality of, this two metal level and this a plurality of perforations form a plurality of resonant bodies and are looped around these a plurality of resonant bodies frame on every side, these a plurality of resonant bodies have identical pattern in the two sides of this insulation board, these a plurality of resonant bodies are the array-like setting and have 2 first adjacent resonant bodies and 2 second adjacent resonant bodies, between this 2 first resonant body, between this 2 second resonant body and this adjacent first resonant body and this second resonant body among form one first resonant cavity, respectively between this first resonant body and this frame and respectively this second resonant body and this frame among form at least one the second resonant cavity, this frame has two openings in wherein at least one mask of this insulation board, wherein this first resonant body and wherein this second resonant body respectively towards this two opening extend one the input end and one output the end; And
One frequency modulation screw, spiral shell are located in the screw of this metal shell and can be moved relative to this filter, in order to adjust the resonance frequency of this filter.
13. adjustable filter device according to claim 12 is characterized in that, the frame of this filter aligns with a bottom margin of this metal shell, and this metal shell covers thereon and electrical contact with it along this frame.
14. adjustable filter device according to claim 13, it is characterized in that, these a plurality of perforations are located at this a plurality of resonant bodies, and this two metal level is provided with a plurality of metal fixings in this frame, and these a plurality of metal fixings mutually lock this frame and this metal shell and mutually electrically conduct.
15. adjustable filter device according to claim 12, it is characterized in that, the first resonant cavity between this 2 first resonant body and this 2 second resonant body is Openworks shape, and respectively this second resonant cavity between this resonant body and this frame has this local insulation board.
16. according to claim 1 or 12 described adjustable filter devices, it is characterized in that this input end and output section are positioned at the same face of this frame, the another side of this frame is continuously along the periphery of insulation board and extends.
17. according to claim 1 or 12 described adjustable filter devices, it is characterized in that this insulation board is made with glass fibre or ceramic material, respectively this metal level and this a plurality of perforations are made with identical conductive material.
18. adjustable filter device according to claim 17 is characterized in that, this insulation board is that the compound glass fiber board is made, and respectively this metal level and this a plurality of perforations are made with the material of copper or copper alloy.
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| CN2011103056965A CN103035988A (en) | 2011-09-29 | 2011-09-29 | Adjustable filter device |
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| CN2011103056965A CN103035988A (en) | 2011-09-29 | 2011-09-29 | Adjustable filter device |
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| CN105552489A (en) * | 2016-02-17 | 2016-05-04 | 苏州浦石精工科技有限公司 | Filter shell body |
| WO2017080525A1 (en) * | 2015-11-13 | 2017-05-18 | Commscope Italy S.R.L. | Filter assemblies, tuning elements and method of tuning a filter |
| CN106711558A (en) * | 2015-11-13 | 2017-05-24 | 康普公司意大利有限责任公司 | Filter component, tuning component and method of tuning filter |
| CN109983617A (en) * | 2016-12-09 | 2019-07-05 | 华为技术有限公司 | Filter |
| WO2019232673A1 (en) * | 2018-06-04 | 2019-12-12 | Nokia Shanghai Bell Co., Ltd. | A cavity filter |
| CN114583424A (en) * | 2022-01-26 | 2022-06-03 | 中国电子科技集团公司第十三研究所 | Suspended strip line filter and preparation method thereof |
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Application publication date: 20130410 |