CN208889818U - Fold cavity coated by dielectric tunable filter, duplexer - Google Patents
Fold cavity coated by dielectric tunable filter, duplexer Download PDFInfo
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- CN208889818U CN208889818U CN201821796533.5U CN201821796533U CN208889818U CN 208889818 U CN208889818 U CN 208889818U CN 201821796533 U CN201821796533 U CN 201821796533U CN 208889818 U CN208889818 U CN 208889818U
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Abstract
The utility model discloses a kind of folding cavity coated by dielectric tunable filters, coplanar a resonant cavity and mechanical tuning device are distinguished including top surface, bottom surface, these resonant cavities are staggered in nonlinear, and offer respectively between each resonant cavity and its upper level, next stage resonant cavity and couple window；At least two through-holes are offered in the top/bottom of each resonant cavity；The mechanical tuning device includes the top and bottom mounting disc disposed in parallel of one with resonant cavity, it is identical and tune dielectric rod correspondingly with the through-hole that one group of height is vertically installed in mounting disc, each dielectric rod that tunes can protrude into same depth in corresponding resonant cavity with the relative motion between mounting disc and resonant cavity and via corresponding through-hole.The invention also discloses a kind of folding cavity coated by dielectric adjustable duplexers.The utility model has the advantages that compact-sized, frequency tuning is accurate, and while tuning, keeps bandwidth constant, and echo is lower, no signal leakage.
Description
Technical field
The utility model relates to a kind of tunable filters, duplexer, belong to technical field of micro communication.
Background technique
Tunable filter is the important component of microwave reconfiguration system, widely apply to frequency hopping radio set, electronic countermeasure,
Multi function receiver, dynamic frequency allocation system etc..
Tunable filter has many good qualities, for example, the system using tunable filter can realize frequency by remote control
Rate transformation, high steel tower is climbed up without worker, saves the cost of communication system later period operation；A filter can cover
Many frequency ranges are covered, quotient's material quantity is generated to reduce system, reduces entire material variety；It can remotely control and cut anywhere or anytime
Frequency is changed, utilizes frequency spectrum resource to greatest extent.
Common tunable filter mostly uses the mode of RF switch control loading capacitance or the mode reality of piezoelectric capacitance
Existing, these tunable filters can only operate in lower frequency range.
In recent years due to the needs of communication system development, the tunable filter of microwave frequency band has extensive needs.In order to
It can satisfy and used in the higher frequency range of microwave, the design method of radio-frequency range tunable filter is obviously no longer applicable in.In order to
Enough tunable filters qualified in microwave frequency band design, all use on the basis of waveguide filter at present, add Tuning mechanism real
It is existing.It is a heat subject of the research of microwave communication in recent years, major communication apparatus both domestic and external for waveguide tunable filter
Manufacturer, such as Huawei, in emerging, NEC, Ericsson all to the field carry out in-depth study.Wherein NEC is most just earlier than 2005
Start the research of this aspect, and just delivers relevant research achievement in 2010.
Mainly there are several types of the medium rotations that 1 Japanese NEC Corporation proposes for the implementation method that uses at present in microwave regime
Mode realizes tunable filter (patent No.: WO2010150815A1).The flat-pushing mode of the dielectric-slab of 2 Huawei Companies, and with one
The dieelctric sheet of piece high dielectric constant is adjusted as mechanical tuning device with the mode that two high-intensitive dielectric support bars are pushed
It is humorous.3, Jiangsu PIVOTONE Communication Technologies, Inc. provide it is a kind of with stepper motor drive beryllium-bronze diaphragm make realize can
Tunable filter can tune (patent No.: ZL201521082510.4) in a wide range.
The tunable filter of above-mentioned several ways is all based on a common waveguide filter, and total is one straight
Bar shaped, space utilization rate be not high.The tunable filter of these forms applies to higher frequency, then less problematic；But for
Lower frequency, for example, point-to-point communication 6GH and 7/8GHz frequency range or the Sub-6GHz frequency range in the 5G communication technology, if also
It is that using the above scheme, then the volume of tunable filter is too big, is unfavorable for the system integration, and it is too heavy to will lead to whole system,
Lack practical value.
Utility model content
The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a kind of folding cavity Jie
Matter loads tunable filter, has the advantages that compact-sized, frequency tuning is accurate, and in tuned filter centre frequency
Meanwhile keeping bandwidth constant substantially, and echo is maintained at lower level.
Specifically, the folding cavity coated by dielectric tunable filter of the utility model, including top surface, bottom surface difference are coplanar
One group of resonant cavity and mechanical tuning device, these resonant cavities are staggered in nonlinear, and each resonant cavity and it upper one
Coupling window is offered respectively between grade, next stage resonant cavity；At least two are offered in the top/bottom of each resonant cavity
Through-hole；The mechanical tuning device includes the top and bottom mounting disc disposed in parallel of one with resonant cavity, is vertically pacified in mounting disc
It is identical and tune dielectric rod correspondingly with the through-hole equipped with one group of height, it is each tune dielectric rod can be with mounting disc and resonance
Relative motion between chamber simultaneously protrudes into same depth in corresponding resonant cavity via corresponding through-hole；The aperture of the through-hole is less thanWherein λ0For the aerial wavelength of tunable filter maximum operation frequency, εrDielectric for tuning dielectric rod is normal
Number.
Preferably, the via count of each resonant cavity is 2 or 3.
Preferably, the mechanical tuning device further includes that the relative motion is generated between mounting disc and resonant cavity for driving
Driving device.It is further preferred that the driving device be can remote control romote-controlled driving device.
Preferably, the dielectric constant of the tuning dielectric rod is 3.0~5.5.It is further preferred that the tuning dielectric rod
Material be quartz.
Preferably, resonator is provided in the resonant cavity.
Preferably, the working frequency range of the tunable filter is 6GH the and 7/8GHz frequency range or 5G communication of point-to-point communication
Sub-6GHz frequency range in technology.
Preferably, all resonant cavities are implemented in the component being put together up and down by one piece of bottom plate and one piece of top plate
Portion.
Following technical scheme can also be obtained according to identical utility model thinking:
Cavity coated by dielectric adjustable duplexer is folded, coplanar multiple resonant cavities and tuning are distinguished including top surface, bottom surface
Mechanism, the resonant cavity, which is divided into, respectively constitutes two groups of low side filter and high end filter, and each group of resonant cavity is in non-
It is linear be staggered and offered respectively between each resonant cavity and its upper level, next stage resonant cavity couple window；Often
At least two through-holes are offered in the top/bottom of a resonant cavity；The mechanical tuning device includes the top surface of one with resonant cavity
With bottom surface mounting disc disposed in parallel, it is identical and adjust correspondingly with the through-hole that one group of height is vertically installed in mounting disc
Humorous dielectric rod, each tuning dielectric rod can protrude into corresponding with the relative motion between mounting disc and resonant cavity and via corresponding through-hole
Same depth in resonant cavity；The aperture of the through-hole is less thanWherein λ0For the adjustable duplexer maximum operation frequency
Aerial wavelength, εrFor the dielectric constant for tuning dielectric rod.
Preferably, the via count of each resonant cavity is 2 or 3.
Preferably, the mechanical tuning device further includes that the relative motion is generated between mounting disc and resonant cavity for driving
Driving device.It is further preferred that the driving device be can remote control romote-controlled driving device.
Preferably, the dielectric constant of the tuning dielectric rod is 3.0~5.5.It is further preferred that the tuning dielectric rod
Material be quartz.
Preferably, resonator is provided in the resonant cavity.
Preferably, the working frequency range of the adjustable duplexer is 6GH the and 7/8GHz frequency range or 5G communication of point-to-point communication
Sub-6GHz frequency range in technology.
Preferably, all resonant cavities are implemented in the component being put together up and down by one piece of bottom plate and one piece of top plate
Portion.
Compared with prior art, technical solutions of the utility model have the advantages that
1, the utility model folds the basic structure of arrangement using multiple resonant cavities, compared to traditional waveguide filter knot
Structure, more compact structure, shared volume is smaller, in this 6GH and 7/8GHz 5G communication technology for point-to-point communication
Lower frequency range as Sub-6GHz has even more important meaning；
2, the utility model protrudes into the depth of resonant cavity by dielectric rod to carry out frequency tuning, and it is not very sensitive for tuning,
Tuning precision is easy to control, therefore does not need the variable speed drives structure of extremely complex precision；
3, in tuning, filter centre frequency is mobile and dielectric rod protrudes into the distance in resonant cavity almost for the utility model
It is linear relationship, therefore is easily controlled required filter centre frequency when tuning, guarantees the accuracy of frequency；And it can
By the size and location parameter of optimized medium stick, so that keeping returning between resonant cavity and resonant cavity while tuned frequency
One change coefficient of coup holding is basically unchanged, to realize that holding bandwidth is basically unchanged during tuning and echo keeps preferable water
It is flat；
4, the utility model can effectively inhibit the leakage problem of electromagnetic wave signal, unlike metal tuning part, need
Want point-device electromagnetic armouring structure.
Detailed description of the invention
Fig. 1 is the explosive view that the utility model folds one specific embodiment of cavity coated by dielectric adjustable duplexer；Wherein,
1 is bottom plate, and 2 be top plate, and 3 be mounting disc, and 4 be resonant cavity, and 5 be tuning dielectric rod, and 6 be coupling window, and 7 be linear guides inner core, 8
It is control circuit board for motor, 9,10 be linear guides housing.
Fig. 2 is the transmission coefficient for tuning dielectric rod and protruding into filter in the case of resonant cavity different depth；
Fig. 3 is the echo for tuning dielectric rod and protruding into filter in the case of resonant cavity different depth.
Specific embodiment
For deficiency present in existing tunable filter technology, the resolving ideas of the utility model is using multiple resonance
The basic structure that chamber folds arrangement improves space utilization, and can be from resonant cavity top or bottom for each cavity configurations two or more
Portion synchronizes the dielectric rod protruded into resonant cavity as tuning part, at the same to for the clear size of opening that dielectric rod passes in and out optimize with
Inhibit electromagnetic-wave leakage.
Specifically, the folding cavity coated by dielectric tunable filter that the utility model is proposed, including top surface, bottom surface point
One group of not coplanar resonant cavity and mechanical tuning device, these resonant cavities are staggered in nonlinear, and each resonant cavity and it
Upper level, offer coupling window respectively between next stage resonant cavity；Offered in the top/bottom of each resonant cavity to
Few two through-holes；The mechanical tuning device includes the top and bottom mounting disc disposed in parallel of one with resonant cavity, in mounting disc
It is identical and tune dielectric rod correspondingly with the through-hole to be vertically installed with one group of height, it is each tune dielectric rod can be with mounting disc
Relative motion between resonant cavity simultaneously protrudes into same depth in corresponding resonant cavity via corresponding through-hole；The hole of the through-hole
Diameter is less thanWherein λ0For the aerial wavelength of tunable filter maximum operation frequency, εrFor tuning dielectric rod
Dielectric constant.
Since duplexer is as made of a high end filter and a low side filter bank, based on same
Utility model thinking can also obtain the folding cavity coated by dielectric adjustable duplexer of the utility model, including top surface, bottom surface point
Not coplanar multiple resonant cavities and mechanical tuning device, the resonant cavity, which is divided into, respectively constitutes low side filter and high end filter
Two groups, each group of resonant cavity is in nonlinear be staggered and upper level, the next stage resonant cavity of each resonant cavity and it
Between offer coupling window respectively；At least two through-holes are offered in the top/bottom of each resonant cavity；The tuning machine
Structure includes the top and bottom mounting disc disposed in parallel of one with resonant cavity, and it is identical that one group of height is vertically installed in mounting disc
And dielectric rod is tuned correspondingly with the through-hole, each tuning dielectric rod can be with the relative motion between mounting disc and resonant cavity
And same depth in corresponding resonant cavity is protruded into via corresponding through-hole；The aperture of the through-hole is less thanWherein λ0For
The aerial wavelength of adjustable duplexer maximum operation frequency, εrFor the dielectric constant for tuning dielectric rod.
It wherein, is preferably two or three for the tuning dielectric rod of each cavity configurations, that is, the through-hole of each resonant cavity
Number preferably 2 or 3.Reason for doing so is that: dielectric tuning stick is inside resonant cavity by changing dividing for energy of electromagnetic field
The cloth coupling between the frequency and two resonant cavities of tuned resonance cavity simultaneously.When dielectric rod is close to coupling window direction,
Coupling numbers can become larger, but frequency can be got higher simultaneously, when dielectric tuning stick is close to resonant cavity center far from coupling window, coupling
Collaboration number dies down, and resonance frequency is lower.By adjusting position of the dielectric tuning stick in resonant cavity and dielectric tuning stick
Diameter come and meanwhile adjust the coefficient of coup and resonance frequency.In order to reduce the species number of dielectric tuning stick, in this example only with
Tri- kinds of specifications of diameter 4mm, 4.5mm and 5mm, in most cases, two dielectric tuning sticks of each resonant cavity are just able to satisfy requirement,
But in some resonant cavities, cannot meet the requirements is, then uses three dielectric tuning sticks.Certain quantity can also be more, though
So by accelerating, emulation difficulty can be reduced, but the corresponding structure that will lead to is excessively complicated, and increased costs.Tuning is situated between
The dielectric material that matter stick should use the moderate loss angle tangent of dielectric constant small, tunes the permittivity ε of dielectric rodrSelection should not mistake
It is low, the too low narrow range for leading to tuning；Do not answer yet it is excessively high, it is excessively high will lead to tuning it is too sensitive, it is not easy to control；This is practical new
Type preferably use dielectric constant for 3.0~5.5 dielectric material, such as quartz or microwave ceramics, plastics etc..In addition, medium
Loss angle tangent it is the smaller the better, the Insertion Loss of smaller then filter is smaller.
In order to guarantee tune dielectric rod protrude into the intracavitary depth of filter resonance be it is the same, used in the utility model
The length of All Media tuning wand is the same, and is all mounted in the same mounting disc, so as to mounting disc with it is humorous
Resonant cavity is protruded into or is extracted in relative motion between vibration chamber, to change the center operating frequency of filter, protrudes into the depth of resonant cavity
Degree is deeper, then frequency is lower, conversely, then frequency is higher.The material of mounting disc has no particular/special requirement, either metal material or
Nonmetallic materials can also be obtained simultaneously using dielectric material integrated molding identical with tuning dielectric rod with tuning medium
The mounting disc of stick can flexibly be determined according to cost and manufacture craft difficulty.Relative motion between mounting disc and resonant cavity can
Linear guides can also be increased to guarantee using the various driving methods (generalling use electrical motor driven) such as manually or electrically
Balance between mounting disc and resonant cavity when relative motion.In order to realize the remote control of filter tuner, can further use
Romote-controlled driving device with distant control function.
According to actual needs, resonator can also be added in resonant cavity, such as column, step-like, irregular convex etc.
The resonator of structure.
The utility model is at the top of resonant cavity or bottom is provided with the through-hole for passing through tuning dielectric rod, in order to prevent
Electromagnetic wave is leaked via these through-holes, and the aperture of these through-holes is optimized in the utility model, and the through-hole aperture of design is small
InWherein λ0For the tunable filter/aerial wavelength of duplexer maximum operation frequency, εrTo tune dielectric rod
Dielectric constant.The aperture of these through-holes, shape can be the same or different, as long as clear size of opening meets this condition
Effectively inhibit electromagnetic signal leakage, it is contemplated that easy to make, size, the shape of all through-holes are preferably unified.Due to not having to consider
The problem of electromagnetic signal leaks, tuning dielectric rod do not need to be fitted close with through-hole, on the one hand, without the concern for complicated electromagnetism
Shielding measure；On the other hand, the requirement on machining accuracy of tuning dielectric rod being reduced, the diameter for tuning dielectric rod can be smaller, from
And may make when being inserted into dielectric rod, there are certain gap, avoid due to cause there are frictional force dielectric rod and cavity it
Between stuck, the case where motor is unable to promotion medium stick generation.
The diameter for tuning dielectric rod can be different, but in this way can be to the simulation optimization and tuning medium of electromagnetic performance
The manufacturing of stick brings difficulty；Comprehensively consider design flexibility, design complexities and production cost, can be tuning dielectric rod
Set a small amount of several dimensions, such as 5mm, 4.5mm and 4mm these three specifications.
Tunable filter/the duplexer is suitably employed in the frequency range of two, three GHz to two, 30 GHz, preferably
Lower frequency range as Sub-6GHz in 6GH and 7/8GHz the 5G communication technology of point-to-point communication.
For the ease of public understanding, come to this reality below by the specific embodiment of an adjustable duplexer and in conjunction with attached drawing
It is described in detail with novel technical solution:
As shown in Figure 1, the adjustable duplexer in the present embodiment includes the bottom plate 1 and top plate 2 of metal, it is arranged in insole board
There is a series of identical cavity of depth, bottom plate 1 and top plate 2 can piece together a complete component up and down, be in the components interior
A series of contour resonant cavities 4 are formed, as shown in Figure 1, these resonant cavities 4 are staggered in nonlinear, that is, constitute so-called folding
Folded cavity body structure.The present embodiment is duplexer (filter is similar), these resonant cavities 4, which are divided into, separately constitutes high-end filtering
Two groups of device and low side filter lead between the upper level resonant cavity and adjacent next stage resonant cavity in each group of resonant cavity 4
It crosses the coupling window 6 being provided between two resonant cavities on side wall and realizes electromagnetic coupling, naturally it is also possible to using other couplings
Mode.In resonant cavity in the present embodiment and not set resonator, working frequency range that can actually be as needed is in resonant cavity
Middle setting resonator, such as column, step-like, the irregular isostructural resonator of convex.
As shown in Figure 1, the mechanical tuning device of the present embodiment includes mounting disc 3 made of piece of metal aluminium, it is arranged in parallel in bottom
The lower section of plate 1, be equipped in mounting disc 3 a series of consistent tuning dielectric rod of height 5 (circular quartz stick is used in the present embodiment,
Permittivity ε is lost in itrBe 3.78, loss angle tangent less than 0.0001, the diameter specifications of quartz pushrod be 5mm, 4.5mm and
4mm), the corresponding 2 or 3 tuning dielectric rods 5 of each resonant cavity, when the movement of the opposite bottom plate 1 of mounting disc 3, tuning dielectric rod 5 can be through
Circular through-hole 6 by being set to 1 bottom of bottom plate correspondingly to it protrudes into the same depth of corresponding resonant cavity, in filter
Frequency of heart protrudes into the change in depth of resonant cavity with tuning dielectric rod 5, gos deep into that depth is deeper, then frequency is lower, conversely, then frequency is got over
It is high.In order to effectively electromagnetic signal be inhibited to reveal, the aperture of through-hole 6 is less thanWherein λ0For the adjustable duplexer maximum work
The aerial wavelength of working frequency, εrFor the dielectric constant for tuning dielectric rod.Quartz pushrod diameter is with it in corresponding resonant cavity
Location parameter is determined by simulation calculation, may make while tuned frequency, keeps the normalizing between resonant cavity and resonant cavity
Change coefficient of coup holding to be basically unchanged, to guarantee that holding bandwidth is basically unchanged during tuning and echo keeps preferable water
It is flat.As shown in Figure 1, the mechanical tuning device in the present embodiment further includes the motor 8 for driving the opposite bottom plate 1 of mounting disc 3 to move, line
Property guide rail inner core 7 with the linear guides that linear guides housing 10 is constituted be used to ensure that balance when moving, control circuit board 9 to be used
In the operation for controlling motor 8 according to telecommand.
Fig. 2 and Fig. 3 be set forth the depth that tuning wand protrudes into resonant cavity be respectively 0.25mm, 2.9mm, 5mm,
Under five states of 7.5mm/8.5, the transmission coefficient and echo of above-mentioned adjustable duplexer middle and high end filter, the filtering as seen from the figure
When device tunes in the frequency range of 7.2GHz--8.2GHz, there is good echo and loss, and bandwidth can keep basic
It is constant.
Claims (18)
1. folding cavity coated by dielectric tunable filter, coplanar one group of resonant cavity and tuning machine are distinguished including top surface, bottom surface
Structure, these resonant cavities are staggered in nonlinear, and between each resonant cavity and its upper level, next stage resonant cavity respectively
Offer coupling window；It is characterized in that, offering at least two through-holes in the top/bottom of each resonant cavity；The tune
Humorous mechanism includes the top and bottom mounting disc disposed in parallel of one with resonant cavity, is vertically installed with one group of height in mounting disc
It is identical and tune dielectric rod correspondingly with the through-hole, it is each tune dielectric rod can be with opposite between mounting disc and resonant cavity
It moves and protrudes into same depth in corresponding resonant cavity via corresponding through-hole；The aperture of the through-hole is less thanWherein
λ0For the aerial wavelength of tunable filter maximum operation frequency, εrFor the dielectric constant for tuning dielectric rod.
2. folding cavity coated by dielectric tunable filter as described in claim 1, which is characterized in that the via count of each resonant cavity
It is 2 or 3.
3. folding cavity coated by dielectric tunable filter as described in claim 1, which is characterized in that the mechanical tuning device further includes
For driving the driving device for generating the relative motion between mounting disc and resonant cavity.
4. folding cavity coated by dielectric tunable filter as claimed in claim 3, which is characterized in that the driving device is can be remote
The romote-controlled driving device of journey manipulation.
5. folding cavity coated by dielectric tunable filter as described in claim 1, which is characterized in that Jie of the tuning dielectric rod
Electric constant is 3.0~5.5.
6. folding cavity coated by dielectric tunable filter as claimed in claim 5, which is characterized in that the material of the tuning dielectric rod
Matter is quartz.
7. folding cavity coated by dielectric tunable filter as described in claim 1, which is characterized in that be provided in the resonant cavity
Resonator.
8. folding cavity coated by dielectric tunable filter as described in claim 1, which is characterized in that the work of the tunable filter
Frequency range is in 6GH the and 7/8GHz frequency range or the 5G communication technology of point-to-point communication
Sub-6GHz frequency range.
9. folding cavity coated by dielectric tunable filter as described in claim 1, which is characterized in that all resonant cavities are implemented in
By the inside for the component that one piece of bottom plate and one piece of top plate are put together up and down.
10. folding cavity coated by dielectric adjustable duplexer, coplanar multiple resonant cavities and tuning machine are distinguished including top surface, bottom surface
Structure, the resonant cavity, which is divided into, respectively constitutes two groups of low side filter and high end filter, and each group of resonant cavity is in non-thread
Being staggered and offering respectively between each resonant cavity and its upper level, next stage resonant cavity for property couples window；It is special
Sign is, at least two through-holes are offered in the top/bottom of each resonant cavity；The mechanical tuning device includes one and resonance
The mounting disc disposed in parallel of the top and bottom of chamber, be vertically installed in mounting disc one group of height it is identical and with the through-hole one by one
Corresponding tuning dielectric rod, each tuning dielectric rod can be with the relative motion between mounting disc and resonant cavity and via corresponding through-hole
Protrude into same depth in corresponding resonant cavity；The aperture of the through-hole is less thanWherein λ0For adjustable duplexer maximum
The aerial wavelength of working frequency, εrFor the dielectric constant for tuning dielectric rod.
11. folding cavity coated by dielectric adjustable duplexer as claimed in claim 10, which is characterized in that the through-hole of each resonant cavity
Number is 2 or 3.
12. folding cavity coated by dielectric adjustable duplexer as claimed in claim 10, which is characterized in that the mechanical tuning device also wraps
It includes for driving the driving device for generating the relative motion between mounting disc and resonant cavity.
13. folding cavity coated by dielectric adjustable duplexer as claimed in claim 12, which is characterized in that the driving device is can
The romote-controlled driving device of remote control.
14. folding cavity coated by dielectric adjustable duplexer as claimed in claim 10, which is characterized in that the tuning dielectric rod
Dielectric constant is 3.0~5.5.
15. folding cavity coated by dielectric adjustable duplexer as claimed in claim 14, which is characterized in that the tuning dielectric rod
Material is quartz.
16. folding cavity coated by dielectric adjustable duplexer as claimed in claim 10, which is characterized in that be arranged in the resonant cavity
There is resonator.
17. folding cavity coated by dielectric adjustable duplexer as claimed in claim 10, which is characterized in that the work of the adjustable duplexer
Make 6GH the and 7/8GHz frequency range or the Sub-6GHz frequency range in the 5G communication technology that frequency range is point-to-point communication.
18. folding cavity coated by dielectric adjustable duplexer as claimed in claim 10, which is characterized in that all resonant cavities construct
In the inside for the component being put together up and down by one piece of bottom plate and one piece of top plate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109244619A (en) * | 2018-11-02 | 2019-01-18 | 江苏贝孚德通讯科技股份有限公司 | Fold cavity coated by dielectric tunable filter, duplexer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109244619A (en) * | 2018-11-02 | 2019-01-18 | 江苏贝孚德通讯科技股份有限公司 | Fold cavity coated by dielectric tunable filter, duplexer |
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