CN101630767A - Cavity medium filter and tuning method thereof - Google Patents
Cavity medium filter and tuning method thereof Download PDFInfo
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- CN101630767A CN101630767A CN 200910041751 CN200910041751A CN101630767A CN 101630767 A CN101630767 A CN 101630767A CN 200910041751 CN200910041751 CN 200910041751 CN 200910041751 A CN200910041751 A CN 200910041751A CN 101630767 A CN101630767 A CN 101630767A
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Abstract
The invention discloses a cavity medium filter comprising a cavity. The cavity is provided with a plurality of resonant cavities, a coupling window is arranged between at least one pair of resonant cavities, and at least one coupling window is provided with a tuning device used for matching and adjusting the coupling amount of belonged adjacent two resonant cavities on at least two places of the coupling window. The tuning device comprises a horizontal tuning rod and a vertical tuning rod, wherein, the horizontal tuning rod is arranged vertically to a plane connected by taking the axis of the resonator of two belonged resonant cavities, and the vertical tuning rod is arranged parallel to the plane connected by taking the axis of the resonator of two belonged resonant cavities. By combining the tuning method of the invention, the horizontal tuning rod of the tuning device roughly adjusts the coupling amount, and the vertical tuning rod finely adjusts the coupling amount. The invention can more accurately tune the cavity medium filter so as to ensure that the filter can obtain better performance indexes.
Description
[technical field]
The present invention relates to the mobile communication equipment field, relate in particular to a kind of cavity medium filter and tuning methods thereof.
[technical background]
In present mobile communication technology, the microwave radio device has become essential important component.Filter is as a kind of basic radio-frequency devices, and it inserts loss, a series of indexs such as band outer inhibition, passive intermodulation and power capacity for the machine performance important influence.Traditional metal coaxial cavity filter is owing to the reason of own loss, under the situation that limits cavity size, can't obtain very high quality factor (Q value), cause suppressing, inserting index such as loss and be subjected to certain restriction, and link such as the silver-plated processing in metal surface also can produce certain influence to the passive intermodulation index with outer.
And for existing cavity body filter since also do not have at present a kind of accurately, tuning methods easily, cause device debugging difficulty in manufacturing process big, the radio-frequency performance index of device also is difficult to realize.
In the known cavity body filter, the main dual mode that adopts carries out tuning, the first is undertaken tuning by a plurality of vertical tuning plugs that go deep into inside cavity are set on filter cover board, another then is to be undertaken tuning by laterally inserted a plurality of tuning plugs on the filter sidewall, the tunning effect of this dual mode is all very limited, and it is tuning with the filter to be that integral unit carries out globality basically.
[summary of the invention]
Main purpose of the present invention is to overcome above-mentioned deficiency, provides that a kind of with the adjacent resonators to be that the unit carries out tuning, is convenient to accurately adjust the coupling amount so that guarantee the cavity medium filter of high quality factor.
Another object of the present invention is to provide a kind of cavity medium filter to carry out tuning tuning methods to last purpose.
For realizing this purpose, the present invention adopts following technical scheme:
Cavity medium filter of the present invention, comprise cavity, cavity is provided with some resonant cavitys, is provided with coupling window between at least one pair of resonant cavity, at least one coupling window place is provided with tuner, is used for the coupling amount between adjacent two resonant cavitys under at least two places of this coupling window match adjustment.
Described tuner comprises horizontal tuning rod and vertical tuning plug, described horizontal tuning rod with the perpendicular setting in the plane that axis was linked to be of the resonator of affiliated two resonant cavitys, described vertical tuning plug with the plane parallel setting that axis was linked to be of the resonator of affiliated two resonant cavitys.The horizontal tuning rod of described tuner is all passed the setting of described cavity lateral wall with screw form with vertical tuning plug, and perhaps, the horizontal tuning rod of described tuner and vertical tuning plug are one of at least to be installed in the form setting of inside cavity chamber wall.Described vertical tuning plug places the top of horizontal tuning rod.Described horizontal tuning rod and vertical tuning plug are provided with based on the cavity evagination for tuning adjusting portion one of at least.
Tuning methods at above-mentioned cavity medium filter of the present invention comprises:
After overall filter installs, at each and cavity wall existence the tuner of relation is installed, carry out following substep:
At first, regulate by the length that the adjusting portion of its horizontal tuning rod is goed deep into cavity to this horizontal tuning rod, until the coupling amount between adjacent two resonant cavitys under this tuner reach with default desired quantity near till; Secondly, by the adjusting portion of its vertical tuning plug the length that this vertical tuning plug gos deep into cavity is regulated, till the coupling amount between adjacent two resonant cavitys under this tuner reaches infinite tendency or equals this desired quantity.
Before overall filter installs, occuping non-, in advance the length of the horizontal tuning rod by detecting the tuner of determining this place and installing and fixing near in the coupling window of cavity lateral wall; After overall filter installs, at this tuner, the adjusting portion of regulating its vertical tuning plug is goed deep into the length of cavity to regulate this vertical tuning plug, until adjacent two resonant cavitys under this tuner and between the coupling amount reach infinite tendency or the desired quantity that equals to preset till.
Compared with prior art, the present invention has following advantage: the present invention can carry out tuning to cavity medium filter more accurately, because the direction of the magnetic line of force that horizontal tuning rod produces because of induction and under it direction of the magnetic line of force of adjacent two resonant cavitys tangent, can give birth to bigger influence to the coupling volume production between its affiliated two resonant cavitys so regulate this horizontal tuning rod, regulating effect is comparatively obvious; And since the direction of the magnetic line of force that vertical tuning plug is produced because of induction with its under the direction of the magnetic line of force of adjacent two resonant cavitys perpendicular so regulate this vertical tuning plug can be to the life of the coupling volume production between its affiliated two resonant cavitys fine setting effect.A plurality of tuners in the same cavity medium filter match with vertical tuning plug by its horizontal tuning rod separately, can be proper state of every pair of cavity configurations, and then whole filter obtain the preferable performance index.
[description of drawings]
Fig. 1 is the electrical structure schematic diagram of an embodiment of cavity medium filter of the present invention;
Fig. 2 is the physical structure schematic diagram with the corresponding cavity medium filter of Fig. 1;
Fig. 3 removes physical structure vertical view behind the top cover with the corresponding cavity medium filter of Fig. 2;
Fig. 4 is the structural representation of a kind of tuner of the present invention;
Fig. 5 is the structural representation of another kind of tuner of the present invention;
Fig. 6 is the physical structure vertical view of another embodiment of cavity medium filter of the present invention;
Fig. 7 is the transmission characteristic schematic diagram of cavity medium filter of the present invention.
[embodiment]
The present invention is further illustrated below in conjunction with drawings and Examples:
See also Fig. 1, the cavity medium filter of the first embodiment of the present invention distributes according to the electrical structure of Fig. 1, wherein the coupling of signal order is in 11 to 16 effects of some resonant cavitys, resonant cavity 11 and resonant cavity 15 are as link, radiofrequency signal self-resonance chamber 11 is imported and 15 outputs of self-resonance chamber, otherwise perhaps imports and 11 outputs of self-resonance chamber from resonant cavity 15.With the former is example, and after signal self-resonance chamber 11 was coupled to resonant cavity 12 and is coupled to resonant cavity 13 then, resonant cavity 13,14 was formed the cross-couplings relation between 15, carries out output just now after the cross-couplings.In addition, resonant cavity 16 reflects with resonant cavity 11 as zero chamber 16, frequency band (also the claiming passband) left side or the right side that are used in radiofrequency signal produce transmission zero, resonant cavity 16 not with resonant cavity 11 outside other resonant cavity 12,13, direct effect in 14,15 generations electrically.
See also Fig. 2, in the physical structure of cavity medium filter of the present invention, form by a metallic cavity on the whole, this cavity comprises the cell body 22 of bottom and covers the cover plate 21 of locking with this cell body 22 that a joint 31,32 is respectively established in cell body 22 both sides among Fig. 2, be used to connect signal cable, its inside is provided with six resonant cavitys 11 to 16 that are arranged substantially by electrical structure shown in Figure 1, is equipped with resonator in each resonant cavity (as by 160 and 168,130 and 138,140 and 148 form, and other resonant cavity is analogized, down together), each resonator includes the resonance post (110,120,130 that is erected at cell body 22 bottoms, 140,150,160, down with) and place tuning dish above this resonance post (as 168,138,148, other is not represented, and is together following).Each tuning dish top is provided with threaded shank (as 1680), and the corresponding position of described cover plate 21 is provided with the through hole (210,220 of the tuning plate screw of confession portion screw lock, 230,240,250,260, down together), tuning dish by with the through hole of cover plate 21 screw lock mutually, make itself and cover plate 21 fix the top that is suspended at corresponding resonance post, and make its threaded shank stretch out cover plate 21 lateral surfaces, thereby, can be in the cavity outside threaded shank (as 1680) by the rotary tuning dish realize tuning to each resonant cavity.
The resonant cavity of present embodiment, main mould are TE
01Mould, electric field is axial around cylindrical cavity, and magnetic field axially passes from medium inside along the resonance post, and is vertical with electric field.
In conjunction with Fig. 3, be connected with the coupling that realizes signal at the arc silver line 41 of joint 31 inside by one between resonant cavity 11 and the joint 31, in like manner, on Fig. 2 and right side shown in Figure 3, be connected with the coupling that arc silver line 42 on joint 32 is realized signals by one between resonant cavity 15 and the joint 32.The resonance post 110 concentric settings of arc silver line 41 and resonant cavity 11,42 on silver-colored line of arc and the 150 concentric settings of resonance post.Arc silver line 41 and 42 shared radians are big more, and its coupling effect is weak more, and shared radian is more little, and then coupling effect is strong more.Thereby the size of its radian should be determined by actual measurement.
As shown in Figures 2 and 3, a plurality of resonant cavity 11...16 of cavity medium filter, be that chamber wall by a plurality of settings are set in cell body 22 inside is divided into a plurality of subregions with the cavity of cell body 22 and forms, promptly become described resonant cavity 11...16 by described resonator is set for each subregion.Thus, just there is a chamber wall 20 between adjacent two resonant cavitys, if with these chamber wall 20 local removals, just form the coupling window 51,52,53 between associated adjacent two resonant cavitys of this chamber wall, 54,55, every adjacent two resonant cavitys just can carry out the coupling of signal by relative corresponding coupling window 51...55, realize electric connection each other.Electrical principle according to Fig. 1, among Fig. 2 and Fig. 3, resonant cavity 11 is coupled by coupling window 51 and resonant cavity 12, resonant cavity 12 is by coupling window 52 and resonant cavity 13 couplings, resonant cavity 13 is coupled by coupling window 53 and resonant cavity 14, resonant cavity 14 is coupled by coupling window 54 and resonant cavity 15, resonant cavity 13 then is coupled by cross-couplings device 6 and resonant cavity 15, thereby make resonant cavity 13,14,15 form the cross-couplings relation, as seen, resonant cavity 11 to the 15 common radiofrequency signals that form are handled stream, have neither part nor lot in wherein as for resonant cavity 16, reason is that resonant cavity 16 only reflects by coupling window 55 and resonant cavity 11, to reach the effect that produces the signal transmission zero.The transmission zero that resonant cavity 16 is produced both can produce in the left side of radiofrequency signal frequency band, also can produce on the right side of radiofrequency signal frequency band, specifically can realize that transmission zero occupies a left side or occupies right by regulating its tuning dish.
Among each resonant cavity 11...16, the magnetic line of force direction that its resonance post 110 is produced is to pass from its axis one end, aloft around entering from its axis other end behind the half cycle, thereby the signal coupling of two adjacent resonators is actually magnetic line of force results of interaction.Tuner 71,72,73,74,75 of the present invention has utilized this characteristic.
Please in conjunction with Fig. 2 and Fig. 3, be provided with tuner 71...75 of the present invention among each coupling window 51...55 respectively, every tuner 71...75 comprises the vertical tuning plug 704 with of a horizontal tuning rod 702, and the installation of tuner 71...75 has disclosed dual mode in an embodiment of the present invention.
But, rely on 702 pairs of coupling amounts of horizontal tuning rod to regulate still merely and can't satisfy needs of the present invention, thereby described vertical tuning plug 704 need further be set.
By Fig. 2 and Fig. 4 as seen, on the cover plate 21 of cavity, some coupling window 51...55 place in the respective chamber is provided with some screws 510,520,530,540,550, and such screw is used to install described vertical tuning plug (as 704).Be example with tuner 75 equally, described vertical tuning plug 704 is made into screw shaped in one side part (top) at least, by screwing in the corresponding screw 550 of cover plate 21, with with the perpendicular mode of cavity diapire deeply to corresponding coupling window 55, naturally, vertical tuning plug 704 just with its under the plane that axis the was linked to be one-tenth parallel (can overlap) of resonator of two resonant cavitys 11,16 of (relevant) relation is set.In like manner, vertical tuning plug 704 is given prominence to an adjusting portion 7040 for adjusting outside cover plate 22.Vertical tuning plug 704 is because electromagnetic induction produces the magnetic line of force around its circumference, the direction of two resonant cavitys 11 under the direction of this magnetic line of force and its and 16 the magnetic line of force is perpendicular, thereby, the adjusting portion 7040 of adjusting vertical tuning plug 704 stretches to length in the cavity with adjusting, can play the effect of the coupling amount of these two resonant cavitys 11 of fine setting and 16 by the interaction between the magnetic line of force.For the adjusting of coupling amount, the regulating effect of vertical tuning plug 704 obviously will weaken than the regulating effect of horizontal tuning rod, but more accurate.Therefore, by that analogy, tuner 71,73,74,75 when needed, can carry out the adjusting of coupling amount between every pair of resonant cavity with cooperatively interacting of vertical tuning plug 704 by its horizontal tuning rod 702.
Many tuner shown in mode one (Fig. 4) is installed in the cavity medium filter of the present invention, because each tuner 71,73,74,75 horizontal tuning rod 702 all exposes to cavity lateral wall 229 with vertical tuning plug 704 and can be implemented in the adjusting at any time of cavity outside, and personnel provide a great convenience for installation and maintenance.
But, as shown in Figures 2 and 3,, and be not suitable for adopting structure shown in mode one, then use the structure of mode two as shown in Figure 5 for the installation of the tuner 72 of the coupling window between resonant cavity 12 and 13 52.In the tuner 72 shown in Figure 5, its vertical tuning plug 704 ' structure and mounting means consistent with the vertical tuning plug 704 that mode one is disclosed, horizontal tuning rod 702 ' then is different.Its horizontal tuning rod 702 ' do not have the lateral wall 229 of cavity can supply fixing, and use its residing two resonant cavitys 12 and 13 chamber wall 20 ' conducts that basic point is installed, the chamber wall 20 of these two resonant cavitys 12 and 13 ' on a screw is set, by determining horizontal tuning rod 702 ' usefulness screw 777 ' screw lock (or riveted joint of length through prior detection, known mechanical connection manners such as welding) this chamber wall 20 ' on and realize fixing, therefore, unless take apart filter replace the horizontal tuning rod 702 of different length ', otherwise horizontal tuning rod 702 herein ' once installation is uncontrollable, but the proposition of mode two solved undoubtedly inside cavity chamber wall 20 ' be provided with horizontal tuning rod 702 ' a difficult problem.
By concrete structure, at a plurality of coupling windows 51,52 according to cavity, aforesaid two kinds of tuners 71 are installed in 53,54,55 flexibly, 72,73,74,75, make each coupling window 51,52 of filter, 53, the adjusting of the coupling amount in 54,55 becomes possibility, and then finishes tuning to overall filter.Thereby cavity medium filter of the present invention utilizes its tuner to carry out tuning method, follows following steps:
1, before overall filter installs, occuping non-near in the coupling window 52 of cavity lateral wall 229, in advance the horizontal tuning rod 702 by detecting the tuner 72 of determining this place ' length and install and fix;
2, after overall filter installs, at each and cavity wall existence the tuner 71,73,74,75 of relation is installed, carry out following substep:
2.1, the length of going deep into cavity by 7020 pairs of these horizontal tuning rod 702 of adjusting portion of its horizontal tuning rod 702 regulates, until this tuner 71, coupling amount between adjacent two resonant cavitys under 73,74,75 reach with default desired quantity near till;
2.2, the length of going deep into cavity of 7040 pairs of these the vertical tuning plugs 704 of adjusting portion by its vertical tuning plug 704 regulates, until this tuner 71,73, coupling amount between adjacent two resonant cavitys under in the of 74,75 reaches infinite tendency (being equivalent to get limiting value) or equals till this desired quantity;
3, after overall filter installs, at the tuner except the step 2 is 72, regulate its vertical tuning plug 704 ' adjusting portion regulating this vertical tuning plug 704 ' go deep into length of cavity, until the coupling amount between adjacent two resonant cavitys 12 and 13 under this tuner 72 reach infinite tendency (being equivalent to get limiting value) or the desired quantity that equals to preset till.
By above-mentioned tuner 71...75 is carried out tuning method, each that can make cavity medium filter of the present invention is adjusted to the coupling amount between the adjacent resonators, for the machine repair personnel provides a kind of maintenance service more flexibly.
Consult Fig. 2, cavity medium filter of the present invention is in order to reach more perfect design effect, and except that improving at tuning manner, also the processing at the radiofrequency signal by wherein improves.Notice the setting of aforementioned resonant cavity 16, only the side (left side or right side) at signal band produces a transmission zero, thereby, can only improve the outer inhibition ability of band of frequency band one side, then need to realize as for the outer inhibition of the band of an other side by cross-couplings device 6 of the present invention.
As shown in Figure 3, cross-couplings device 6 of the present invention is arranged on chamber wall 20 between resonant cavity 13 and the resonant cavity 15 in the mode that flies bar " on; the curved portions 62 that it has a stem 61 and folds in stem 61 two ends; 64; stem 61 and two curved portions 62; 64 are formed by same metal material bending; stem 61 is installed in this two resonant cavitys 13, chamber wall 20 between 15 " on; thereby its two ends stretch to respectively in resonant cavity 13 and 15, curved portions 62,64 respectively with the resonant cavity 13 at its place; 15 resonance post 130,150 concentric (is the center of circle with the axis point) is provided with.The setting of cross-couplings device 6 between resonant cavity 13 and 15 realizes the cross-couplings relation, and the effect that produces the transmission zero of frequency band on the left side or the right side of frequency band.In the cross-couplings device 6 as shown in Figure 3, two curved portions 62,64 perpendicular bisector symmetries about stem 61, two curved portions 62,64 each other homonymy be arranged outward, the magnetic signature that in cavity, produces according to resonator, curved portions 62, the cross-couplings device 6 of 64 homonymy external-opens is-90 ° on phase place, can produce transmission zero on the right side of frequency band, improve the outer inhibition ability of right side band, in filter shown in Figure 3, because of cross-couplings device 6 produces zero point on the right side of frequency band,, zero chamber 16 make it produce transmission zero in the left side of frequency band so needing to regulate its tuning dish 168.Thus, by zero chamber 16 and 6 actings in conjunction of cross-couplings device, can produce two transmission zeros in the left and right sides of frequency band, thereby improve the whole outer inhibition ability of band.
The set-up mode of the curved portions 62,64 of cross-couplings device 6 is not subjected to the limitation of this embodiment, sees also Fig. 6, in another embodiment of cavity medium filter of the present invention, has the design that some places are different from last embodiment, is specially:
At first, because of resonant cavity 81 ', 82 ', 83 ', 84 ' number be confined to 4, thereby, resonant cavity 82 ' both and resonant cavity 83 ' and 84 ' carry out cross-couplings, and simultaneously as zero chamber 82 ' use;
Secondly, owing to do not have the coupling window that keeps clear of the cavity lateral wall, thereby, do not adopt the tuner that aforementioned manner two discloses and the tuner 700 that employing mode one is explained ', as seen, the tuner that mode two is disclosed is an option, is subjected to the concrete structure of cavity and selects for use flexibly;
Moreover, its cross-couplings device 6 ' curved portions 62 ', 64 ' have a setting that is different from last embodiment, two curved portions 62 ', a 64 ' relation of being centrosymmetric, be that both are that receive in the heteropleural each other at the center with stem 61 ' mid point, this structure make cross-couplings device 6 ' phase place be+90 °, can produce transmission zero in frequency band left side to improve the outer inhibition ability of band in frequency band left side.
Among the present invention, need flexible setting to cooperate between cross-couplings device 6 (6 ') and zero chamber 16 (82 ') to realize that whole band is outer suppresses, therefore, in design during filter of the present invention, need follow generally that following steps are provided with this cross-couplings device 6 (6 ') and outer inhibition method is with so that realize it in zero chamber 16 (82 '):
At first, provide a cross-linked as required resonant cavity 13,14,15 (82 ', 83 ', 84 ') between the coupling amount formulate metal, rod-shaped of length; Secondly, should metal, rod-shaped divide into three sections, the section length at place, both sides is equal; Then, with wherein the outside two sections be bent into curved portions 62 (62 '), 64 (64 '), the interlude that keeps shaft-like bonding jumper is stem 61 (61 '); Afterwards, " top is to realize that the signal coupling is incorporated in frequency band one side and produces transmission zero the stem 61 (61 ') of cross-couplings device 6 (6 ') to be fixed on chamber wall 20 between corresponding two resonant cavitys 13,15 (82 ', 84 '); At last, after overall filter installs,, make the frequency band opposite side produce another transmission zero, thereby finish the setting of two transmission zeros by rotating the threaded shank (1680) of the zero tuning dish in chamber 16 (82 ') (as 168).
See also Fig. 7, cavity medium filter of the present invention reaches in sum in conjunction with actual measurement, and the application by tuner, zero chamber, cross-couplings device obtains following effect:
1, the coupling screw rod is set respectively on cavity lateral wall and cover plate, has increased regulating measure, tuning process is convenient flexibly, accurately and reliably;
2, in cavity medium filter, one zero chamber is set, increase a transmission zero in passband one side, can realize inhibition to the outer frequency band of passband; Utilize special curved metal to fly bar, realize the cross-couplings of filter, and introduce a transmission zero at the passband opposite side with zero chamber is corresponding.The acting in conjunction of the transmission zero of introducing by cross-couplings device and zero chamber, guarantee effective passband Insertion Loss-0.8dB with interior condition under, outside the 2MHz of passband right side, inhibiting value can reach-38dB, realizes the low Insertion Loss of filter, the high requirement that suppresses;
3, the coaxial dielectric resonator of cavity medium filter is made by ceramic dielectric, the curved metal that adds flies bar and the coupling tuning plug is little to the influence of passive intermodulation and temperature drift, the intermodulation index of device can reach-160dBc, resonator is when variations in temperature, temperature characterisitic is better, and performance index are unaffected;
4, resonator is not easy the sparking burnout phenomenon to occur with the Metal Contact face, and device can bear powerful radiofrequency signal to be passed through, and the average power of bearing is up to more than 100 watts.
Although the present invention only provides above embodiment, but, those skilled in the art are after reading over this specification, in conjunction with known mechanical general knowledge, should be able to associate more embodiment, but such embodiment is the spirit of unconventional claim of the present invention not, and any type of being equal to replaces or simple modification all should be considered as the included embodiment by the present invention.
Claims (8)
1, a kind of cavity medium filter, comprise cavity, cavity is provided with some resonant cavitys, be provided with coupling window between at least one pair of resonant cavity, it is characterized in that: at least one coupling window place is provided with tuner, is used for the coupling amount between adjacent two resonant cavitys under at least two places of this coupling window match adjustment.
2, cavity medium filter according to claim 1, it is characterized in that: described tuner comprises horizontal tuning rod and vertical tuning plug, described horizontal tuning rod with the perpendicular setting in the plane that axis was linked to be of the resonator of affiliated two resonant cavitys, described vertical tuning plug with the plane parallel setting that axis was linked to be of the resonator of affiliated two resonant cavitys.
3, cavity medium filter according to claim 2 is characterized in that: the horizontal tuning rod of described tuner is all passed the setting of described cavity lateral wall with screw form with vertical tuning plug.
4, cavity medium filter according to claim 2 is characterized in that: the horizontal tuning rod of described tuner and vertical tuning plug are one of at least to be installed in the form setting of inside cavity chamber wall.
5, cavity medium filter according to claim 2 is characterized in that: described vertical tuning plug places the top of horizontal tuning rod.
6, according to any described cavity medium filter in the claim 2 to 5, it is characterized in that: described horizontal tuning rod and vertical tuning plug are provided with based on the cavity evagination for tuning adjusting portion one of at least.
7, a kind of tuning methods of cavity medium filter according to claim 6 is characterized in that: after overall filter installs, at each and cavity wall existence the tuner of relation is installed, is carried out following substep:
At first, regulate by the length that the adjusting portion of its horizontal tuning rod is goed deep into cavity to this horizontal tuning rod, until the coupling amount between adjacent two resonant cavitys under this tuner reach with default desired quantity near till; Secondly, by the adjusting portion of its vertical tuning plug the length that this vertical tuning plug gos deep into cavity is regulated, till the coupling amount between adjacent two resonant cavitys under this tuner reaches infinite tendency or equals this desired quantity.
8, tuning methods according to claim 7 is characterized in that: before overall filter installs, occuping non-near in the coupling window of cavity lateral wall, in advance the length of the horizontal tuning rod by detecting the tuner of determining this place and installing and fixing; After overall filter installs, at this tuner, the adjusting portion of regulating its vertical tuning plug is goed deep into the length of cavity to regulate this vertical tuning plug, until adjacent two resonant cavitys under this tuner and between the coupling amount reach infinite tendency or the desired quantity that equals to preset till.
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| CN108321477A (en) * | 2018-01-31 | 2018-07-24 | 成都天奥电子股份有限公司 | A kind of coupling transform structure for dielectric filter and a kind of dielectric filter |
| CN113725577A (en) * | 2020-05-26 | 2021-11-30 | 大富科技(安徽)股份有限公司 | Filter and communication equipment |
| CN112072237A (en) * | 2020-08-27 | 2020-12-11 | 电子科技大学 | Ceramic/air composite medium adjustable cavity filter |
| CN112072237B (en) * | 2020-08-27 | 2021-12-03 | 电子科技大学 | Ceramic/air composite medium adjustable cavity filter |
| CN113391898A (en) * | 2021-06-15 | 2021-09-14 | 昆山立讯射频科技有限公司 | Cavity filter debugging system and method |
| CN113391898B (en) * | 2021-06-15 | 2024-06-07 | 苏州立讯技术有限公司 | Cavity filter debugging system and method |
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