CN109509945A - Dielectric, dielectric waveguide filter, radio-frequency module and base station - Google Patents
Dielectric, dielectric waveguide filter, radio-frequency module and base station Download PDFInfo
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- CN109509945A CN109509945A CN201811624430.5A CN201811624430A CN109509945A CN 109509945 A CN109509945 A CN 109509945A CN 201811624430 A CN201811624430 A CN 201811624430A CN 109509945 A CN109509945 A CN 109509945A
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- 230000008878 coupling Effects 0.000 claims abstract description 71
- 238000010168 coupling process Methods 0.000 claims abstract description 71
- 238000005859 coupling reaction Methods 0.000 claims abstract description 71
- 238000002955 isolation Methods 0.000 claims abstract description 22
- 238000006880 cross-coupling reaction Methods 0.000 claims description 15
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000004891 communication Methods 0.000 abstract description 4
- 230000005684 electric field Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000002706 plastid Anatomy 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/2002—Dielectric waveguide filters
Abstract
The present invention relates to communication device components technical field, a kind of dielectric, dielectric waveguide filter, radio-frequency module and base station are specifically disclosed.The dielectric includes multiple dielectric bodies combined, the dielectric body surface is covered with conductive layer, the dielectric body includes multiple resonant structures being arranged, the dielectric body is equipped with coupling window, the coupling window position is without conductive layer, the dielectric body is equipped with isolation part, and the coupling bandwidth between two resonant structures that the isolation part connects it is less than the 10% of the bandwidth of operation of the dielectric waveguide filter using the dielectric.Dielectric provided by the invention is able to solve the low problem of the cumbersome, high production cost of assembly and yields existing for existing dielectric waveguide filter.
Description
Technical field
The present invention relates to communication device components technical fields, and in particular to a kind of dielectric, dielectric waveguide filter, radio frequency
Module and base station.
Background technique
Filter is a kind of frequency selective device, and specific frequency content in signal can be made to pass through, and it is other greatly to decay
Frequency content.Waveguide filter is one of filter used in communication system, and traditional waveguide filter is metal
Cavity body structure, centre are air, and metal material edge plays the role of electromagnetic shielding and structural support.The current base station 4G is to adopt
With conventional metals filter, a nearly square meter need to be taken up an area by the metal filter that 8 terminal port antennaes are arranged, weight is more than 100 public affairs
Jin.And 5G antenna for base station port number increases to 64 ports, 128 ports from traditional 8 ports, and filter requirements amount is substantially mentioned
It rises；It, will be considerably beyond steel tower load-bearing capacity if still using conventional metals filter.
Dielectric waveguide filter compares traditional metal cavity waveguide filter, with small in size, Insertion Loss is small, bears power
Greatly, the advantages such as at low cost, can satisfy the requirement in 5G communication system for filter.Existing dielectric waveguide filter,
It is produced in such a way that physically separated multiple dielectrics are assembled.The type and quantity that will lead to dielectric in this way compare
It is more, a variety of frock clamps are needed when production management and assembling and setting.Meanwhile the production of dielectric waveguide filter is for being situated between
The required precision of plastid assembling and setting is very high, and deviation once occur in medium body position or alignment relation will be to entire medium wave
The performance of waveguide filter causes tremendous influence；Therefore in process of production often in order to accurately placing, being aligned these mutually
Independent dielectric needs being dismounted and being debugged repeatedly, causes assembling process cumbersome, time-consuming；To production management, cost control
System and product yield cause very big influence.
Summary of the invention
The invention is intended to provide a kind of dielectric, it is cumbersome, raw to be able to solve the existing assembly of existing dielectric waveguide filter
Produce problem at high cost and low yields.
In order to solve the above-mentioned technical problem, the application provides the following technical solutions:
Dielectric, including multiple dielectric bodies combined, the dielectric body surface is covered with conductive layer, institute
Stating dielectric body includes multiple resonant structures being arranged, and the dielectric body is equipped with coupling window, the coupling window
Without conductive layer, the dielectric body is equipped with isolation part for mouthful position, the isolation part make two that it is connected it is humorous
Coupling bandwidth between vibration portion is less than the 10% of the bandwidth of operation of the dielectric waveguide filter using the dielectric.
It couples bandwidth (CouplingBandwidths, CBWs), is that the another of stiffness of coupling indicates, it can be directly and square
Just it is measured using vector analysis instrument (Vector Network Analyser), is the actual production of filter and designs and develops
The parameter often used.
In technical solution of the present invention, by the way that isolation part is arranged, used so that the coupling bandwidth between two resonant structures is less than
The 10% of the bandwidth of operation of the dielectric waveguide filter of the dielectric is not enough to cause the overall performance of dielectric waveguide filter
It influences, is equivalent between dielectric resonance portion " not coupling ".And then two resonant structures not coupled can be arranged in the same electricity
In medium body, realizes that multiple resonant structures are integrated under the premise of not changing coupled relation, use the medium in the present invention
Body can substantially reduce assembly difficulty of the dielectric waveguide filter in production, simplify the assembly of such dielectric waveguide filter
Process reduces time-consuming, defect rate brought by position dimension inaccuracy when because of assembly is also reduced, so that it is good to improve product
Product rate.
Further, the isolation part is strip through-hole.In resonant structure, intermediate electric field is very strong, more toward edge electric field more
It is weak, the isolation part of an isolation resonant structure is added among adjacent dielectric resonance portion, the part of strong electrical field is kept apart, only protects
The part for staying electric field weak is connected with each other；Since middle electric field is strong, edge electric field is weak, and such integral structure makes dielectric resonance
Coupling between portion can be very weak, and strap width substantially reduces, and the coupling bandwidth between dielectric resonance portion is small for simple and easy realizing
In the 10% of the bandwidth of operation of the dielectric waveguide filter using the dielectric.
Further, the coupling window includes cross-coupling window, and the cross-coupling window setting is situated between in the same electricity
On the surface of dielectric body on matter ontology at the link position of two adjacent resonant structures.It, can by cross-coupling window
To realize the cross-coupling between multiple resonant structures, increase the number of zero point, improves the proximal inhibition ability of filter.
Further, the dielectric body includes the first noumenon and the second ontology, and the first noumenon includes being arranged successively
The first resonant structure, the 4th resonant structure, the 5th resonant structure, the tenth resonant structure and the 9th resonant structure being arranged, the 5th resonant structure and
Isolation part is set between tenth resonant structure；Second ontology includes the second resonant structure, third resonant structure, the 6th resonant structure, the
Seven resonant structures and the 8th resonant structure also are provided with isolation part, the coupling window between the third resonant structure and the 6th resonant structure
Mouth further includes the first coupling window, the second coupling window, third coupling window, the 4th coupling window and the 5th coupling window, institute
It states the first coupling window and the surface of the first resonant structure and the surface of the second resonant structure is set, the second coupling window setting exists
The surface and the of the 5th resonant structure is arranged in the surface on the surface of third resonant structure and the 4th resonant structure, third coupling window
The surface of six resonant structures, the surface on the surface and the tenth resonant structure of the 7th resonant structure is arranged in the 4th coupling window, described
The surface of the 8th resonant structure and the surface of the 9th resonant structure, the first resonant structure on the first noumenon is arranged in 5th coupling window
It is equipped with and hands over on the surface of the junction of the 4th resonant structure and surface of the junction of the 9th resonant structure and the tenth resonant structure
Fork coupling window, on second ontology on the surface of the junction of the second resonant structure and third resonant structure and the 8th resonant structure
Cross-coupling window also is provided with on the surface of the junction of the 7th resonant structure.
Combine the dielectric for forming ten chambers by the first noumenon and the second ontology, the 5th resonant structure and the tenth resonant structure it
Between isolation part is set, and then can be set on the first noumenon, while the electric property of the two will not be impacted, similarly,
Third resonant structure and the 6th resonant structure are also all disposed on the second ontology, are isolated by isolation part, and cross-coupling window can
So that the first resonant structure, the second resonant structure, third resonant structure and the 4th resonant structure cross-coupling, and make the 7th resonant structure,
Cross-coupling between 8th resonant structure, the 9th resonant structure and the tenth resonant structure forms two pairs of zero points, improves proximal inhibition energy
Power.
Further, first resonant structure is equipped with signal input interface, and the tenth resonant structure is exported equipped with signal
Interface.Signal is inputted by input interface, is exported by output interface, and input interface and output interface are arranged at an ontology
On, be conducive to carry out installation wiring, be conducive to the system integration.
Further, it is sintered and is connected by silver paste between the dielectric body.It can guarantee the reliability of connection.
Further, chamfering is equipped at the arris of the dielectric body.It can be convenient the dress of dielectric by the way that chamfering is arranged
Match and debugs.
Further, disclosed herein as well is a kind of dielectric waveguide filters, including any one above-mentioned dielectric.It uses
Above-mentioned dielectric can make the production cost of filter reduce, while be easily installed and integrate.
Further, above-mentioned dielectric waveguide filter, further includes the pcb board equipped with low-pass filter, the pcb board and defeated
It is connected between incoming interface and output interface by linking probe.By linking probe by above-mentioned dielectric waveguide filter and band
There is the pcb board of low-pass filter to integrate, can not only improve system distal end and inhibit, but also be convenient for and the system integration.
Further, application also discloses a kind of radio-frequency module, including above-mentioned dielectric waveguide filter.On having used
The dielectric waveguide filter stated can make production cost be minimized, while can reduce volume, be conducive to minimize.
Further, disclosed herein as well is a kind of base stations, including above-mentioned radio-frequency module.
Due to having used above-mentioned radio-frequency module, production cost can be reduced, it, can be with simultaneously because radio-frequency module is small in size
Mitigate the weight bearing of tower body.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of dielectric embodiment of the invention；
Fig. 2 is the coupling bandwidth and the graph of relation of the connection width of two resonant structures between the resonant structure in Fig. 1；
Fig. 3 is the schematic diagram of present media waveguide filter embodiment；
Fig. 4 is the S parameter curve in present media waveguide filter embodiment；
Fig. 5 is the distal end suppression curve figure of existing dielectric waveguide filter；
Fig. 6 is the distal end suppression curve figure in present media waveguide filter embodiment.
Specific embodiment
It is further described below by specific embodiment:
Appended drawing reference in Figure of description include: the first noumenon 1, the second ontology 2, blind hole 3, through-hole 4, strip through-hole 5,
5th coupling window the 6, the 4th couples window 7, third coupling window 8, second couples window 9, first and couples window 10, intersects coupling
Close window 11, pcb board 12, probe 13.
As shown in Figure 1, the dielectric of the present embodiment, including multiple dielectric bodies combined, dielectric body
Surface is covered with conductive layer, and dielectric body includes multiple resonant structures being arranged, and dielectric body is equipped with coupling window, defeated
Incoming interface and output interface, coupling window position are situated between without conductive layer, input interface and output interface setting in the same electricity
On the different resonant structures of matter ontology, dielectric body be equipped with isolation part, two resonant structures that isolation part connects it
Between coupling bandwidth be less than using the dielectric dielectric waveguide filter bandwidth of operation 10%.Different resonant structures on ontology
Junction be equipped with through-hole 4, the surface of resonant structure is equipped with blind hole 3.Coupling window includes cross-coupling window 11, cross-coupling
The table of dielectric body in the same dielectric body that window 11 is arranged at the link position of two adjacent resonant structures
On face.
In the present embodiment, dielectric body uses ceramic material, and conductive layer uses silver layer, and dielectric body includes first
Body 1 and the second ontology 2, the first noumenon 1 include the first resonant structure, the 4th resonant structure, the 5th resonance for being arranged successively setting
Isolation part is arranged in the middle position of portion, the tenth resonant structure and the 9th resonant structure, the 5th resonant structure and the tenth resonant structure junction；
Isolation part is strip-shaped hole, is a strip-shaped hole in the present embodiment, can be multiple strip-shaped holes in the other embodiments of the application
Combination, second ontology 2 includes the second resonant structure, third resonant structure, the 6th resonant structure, the 7th resonant structure and the 8th humorous
Vibration portion also is provided with isolation part between the third resonant structure and the 6th resonant structure, the coupling window further includes the first coupling window
Mouth 10, second couples window 9, third coupling window the 8, the 4th couples window 7 and the 5th coupling window 6, first coupling window
The surface of the first resonant structure and the surface of the second resonant structure is arranged in mouth 10, and the second coupling window 9 is arranged in third resonance
Surface and the 6th resonance of the 5th resonant structure is arranged in the surface on the surface in portion and the 4th resonant structure, the third coupling window 8
The surface on the surface and the tenth resonant structure of the 7th resonant structure, the 5th coupling is arranged in the surface in portion, the 4th coupling window 7
It closes window 6 and the surface of the 8th resonant structure and the surface of the 9th resonant structure is set, the first resonant structure and the on the first noumenon 1
On the surface of the junction of the four resonant structures and surface of the junction of the 9th resonant structure and the tenth resonant structure, which is equipped with, intersects coupling
Window 11 is closed, on second ontology 2 on the surface of the junction of second resonant structure and third resonant structure and the 8th resonant structure
With also be provided with cross-coupling window 11 on the surface of the junction of the 7th resonant structure, the first resonant structure is equipped with signal input and connects
Mouthful, the tenth resonant structure is equipped with signal output interface.In the present embodiment, it is equipped with down at the arris of the first noumenon and the second ontology
Angle, in another embodiment of the application, the arris of dielectric body is not provided with chamfering, the first noumenon 1 and the second ontology 2 it
Between gap at pass through silver paste sintering connection.
In the present embodiment, TE mode and bandwidth of operation are set at as the dielectric waveguide filter of 100MHz with dielectric
For upper, in resonant structure, the electric field in middle position is very strong, more weaker toward edge electric field, theoretically four, dielectric resonance portion angle
On field distribution be zero.One strip through-hole 5 is set among two resonant structures, the part of strong electrical field is kept apart, is only protected
Hold the weak part connection of edge portions electric field；Since middle electric field is strong, edge electric field is weak, and then such integral structure is brought
Coupling can be very weak.The relation curve of its width for coupling bandwidth (representing stiffness of coupling) and interconnecting piece is as shown in Fig. 2, figure
In horizontal axis be the width connected between two resonant structures, unit is millimeter (mm), and the longitudinal axis is then the first resonant structure and the 6th
Coupling bandwidth between resonant structure, unit are megahertz (MHz).
As can see from Figure 2:
When the overall width of interconnecting piece is less than 2.4mm, it is ensured that it is (low to be less than 10MHZ for coupling bandwidth brought by it
In the 10% of bandwidth of operation), coupling bandwidth is enough small at this time, is not enough to influence the overall performance of dielectric waveguide filter
, that is, can be considered two dielectric resonance portions " not coupling ".
When the overall width of interconnecting piece is less than 2.1mm；It can guarantee that its brought coupling bandwidth is less than 5MHZ and (is lower than
The 5% of bandwidth of operation).
It is brought to couple bandwidth only 4MHZ when the overall width of interconnecting piece is equal to 2mm.
And if coupling bandwidth brought by it is dropped to 2MHz (the 2% of bandwidth of operation), it needs overall width
It reduces to 1.6mm.
The decline of overall width certainly will bring the reduction of bonding strength and form the rising of difficulty.
Coupling bandwidth drops to the overall width of reduction needed for 4MHz only 0.4mm from 10MHZ, however, by curve in figure it is found that
Coupling bandwidth gradually slows down with the speed of overall width reduction later, so continuing to reduce interconnecting piece to reduce coupling bandwidth
Overall width, sacrifice bonding strength are obviously lost more than gain, so the present embodiment has preferably used 2mm as the beam overall of interconnecting piece
Degree, had not only been able to maintain enough bonding strengths, but also made coupling bandwidth very small.
And in further embodiments, selection is so that coupling bandwidth drops to the company between the 2%~10% of bandwidth of operation
Socket part overall width is also can property row.
As shown in figure 3, the present embodiment also discloses a kind of dielectric waveguide filter, which includes above-mentioned medium
Body.Specifically, which includes a pcb board 12, and pcb board 12 is equipped with low-pass filter, pcb board 12 and input interface
And connected between output interface by linking probe 13, so that dielectric waveguide filter is connected to low-pass filter, pcb board 12
Weld together between dielectric, in the present embodiment, is welded on one using reflow soldering process between pcb board 12 and dielectric
It rises.The dielectric waveguide filter uses above-mentioned dielectric, and the production cost of filter can be made to reduce, be easily installed simultaneously
With it is integrated.
The S parameter curve of the dielectric waveguide filter in the present embodiment is shown in Fig. 4；
Horizontal axis in Fig. 4 is that working frequency unit is megahertz (MHz), and the longitudinal axis is the S1.2 parameter of dielectric waveguide filter
(S parameter between the input port and output port of filter), unit dB.
The design requirement of dielectric waveguide filter and dielectric waveguide filter comparative example in the present embodiment are as follows:
Band-pass behavior: bandwidth 160MHZ (2515-2675MHZ)；
Stopband Performance: S parameter is lower than -20dB before 2500MHZ and after 2680MHZ.
As can be known from Fig. 4, the dielectric waveguide filter in the present embodiment, since there are four zero point, proximal inhibition abilities
More preferably；S parameter fully achieves design standard well below -20dB before 2500MHZ and after 2680MHZ.
In the present embodiment, dielectric waveguide filter is additionally provided with the pcb board 12 for having low-pass filter, and then has excellent
Distal end rejection ability more, Fig. 5 are the distal end suppression curve figure of dielectric waveguide filter in the prior art, and Fig. 6 is this implementation
The distal end suppression curve figure of the dielectric waveguide filter of example, it can be seen that the present embodiment has good distal end rejection ability,
Parameter value under 3 to 8GHZ input substantially in -50dB hereinafter,.
The present embodiment also discloses a kind of radio-frequency module, including above-mentioned dielectric waveguide filter, is filtered by Medium Wave Guide
Wave device can be filtered signal in radio-frequency module receiving and transmitting data signals.
The present embodiment also discloses a kind of base station, including above-mentioned radio-frequency module, for carrying out the receipts of base station information signal
Hair processing.
The above are merely the embodiment of the present invention, the common sense such as well known specific structure and characteristic are not made excessively herein in scheme
Description, all common of technical field that the present invention belongs to before one skilled in the art know the applying date or priority date
Technological know-how can know the prior art all in the field, and have using routine experiment means before the date
Ability, one skilled in the art can improve in conjunction with self-ability under the enlightenment that the application provides and implement we
Case, some typical known features or known method should not become the barrier that one skilled in the art implement the application
Hinder.It should be pointed out that for those skilled in the art, without departing from the structure of the invention, if can also make
Dry modification and improvement, these also should be considered as protection scope of the present invention, these all will not influence the effect that the present invention is implemented and
Patent practicability.The scope of protection required by this application should be based on the content of the claims, the specific reality in specification
Applying the records such as mode can be used for explaining the content of claim.
Claims (10)
1. dielectric, including multiple dielectric bodies combined, the dielectric body surface is covered with conductive layer, described
Dielectric body includes multiple resonant structures being arranged, and the dielectric body is equipped with coupling window, the coupling window
Position is without conductive layer, it is characterised in that: the dielectric body is equipped with isolation part, and the isolation part connects it
Two resonant structures between coupling bandwidth be less than using the dielectric dielectric waveguide filter bandwidth of operation 10%.
2. dielectric according to claim 1, it is characterised in that: the isolation part is strip through-hole.
3. dielectric according to claim 1, it is characterised in that: the coupling window includes cross-coupling window, described
The dielectric body in the same dielectric body at the link position of two adjacent resonant structures is arranged in cross-coupling window
Surface on.
4. dielectric according to claim 3, it is characterised in that: the dielectric body includes the first noumenon and second
Body, the first noumenon include the first resonant structure for being arranged successively setting, the 4th resonant structure, the 5th resonant structure, the tenth resonant structure
And the 9th resonant structure, isolation part is set between the 5th resonant structure and the tenth resonant structure；Second ontology includes the second resonance
Portion, third resonant structure, the 6th resonant structure, the 7th resonant structure and the 8th resonant structure, the third resonant structure and the 6th resonant structure
Between also be provided with isolation part, the coupling window further includes the first coupling window, the second coupling window, third coupling window, the
Surface and second resonant structure of the first resonant structure is arranged in four coupling windows and the 5th coupling window, the first coupling window
The surface on the surface and the 4th resonant structure of third resonant structure, the third coupling window is arranged in surface, the second coupling window
The surface of the 5th resonant structure and the surface of the 6th resonant structure is arranged in mouth, and the 7th resonant structure is arranged in the 4th coupling window
The table on the surface and the 9th resonant structure of the 8th resonant structure is arranged in the surface on surface and the tenth resonant structure, the 5th coupling window
Face；On the first noumenon the first resonant structure on the surface of the junction of the 4th resonant structure and the 9th resonant structure and the tenth humorous
The surface of the junction in vibration portion is equipped with cross-coupling window, the company of the second resonant structure and third resonant structure on second ontology
Cross-coupling window also is provided on the surface at the place of connecing and on the surface of the junction of the 8th resonant structure and the 7th resonant structure.
5. dielectric according to claim 1, it is characterised in that: be sintered and connected by silver paste between the dielectric body
It connects.
6. dielectric according to claim 1, it is characterised in that: be equipped with chamfering at the arris of the dielectric body.
7. a kind of dielectric waveguide filter, it is characterised in that: including dielectric such as claimed in any one of claims 1 to 6.
8. dielectric waveguide filter according to claim 7, it is characterised in that: further include the PCB equipped with low-pass filter
Plate, the pcb board are connected with input interface and output interface.
9. a kind of radio-frequency module, it is characterised in that: including dielectric waveguide filter as claimed in claim 8.
10. a kind of base station, it is characterised in that: including radio-frequency module as claimed in claim 9.
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| CN201811624430.5A CN109509945A (en) | 2018-12-28 | 2018-12-28 | Dielectric, dielectric waveguide filter, radio-frequency module and base station |
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| CN201811624430.5A CN109509945A (en) | 2018-12-28 | 2018-12-28 | Dielectric, dielectric waveguide filter, radio-frequency module and base station |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818117A (en) * | 2019-03-29 | 2019-05-28 | 重庆思睿创瓷电科技有限公司 | For reducing the strip lines configuration of power consumption, low-pass filter, communication device and system |
| CN109818116A (en) * | 2019-03-27 | 2019-05-28 | 深圳市国人射频通信有限公司 | A kind of adjustment method of dielectric waveguide filter and its frequency |
| CN110224210A (en) * | 2019-05-30 | 2019-09-10 | 江苏灿勤科技股份有限公司 | A kind of filter in laminated medium comprising negative coupled structure |
| CN110233318A (en) * | 2019-07-09 | 2019-09-13 | 重庆思睿创瓷电科技有限公司 | A kind of coupled structure and filter improving filter harmonic performance |
| CN110336102A (en) * | 2019-07-09 | 2019-10-15 | 重庆思睿创瓷电科技有限公司 | A kind of dielectric waveguide filter, radio-frequency module and base station improving harmonic performance |
| CN110400996A (en) * | 2019-07-03 | 2019-11-01 | 广东通宇通讯股份有限公司 | A kind of ceramic dielectric filling waveguide filter |
| CN114026741A (en) * | 2019-06-26 | 2022-02-08 | Cts公司 | Dielectric waveguide filter with trap resonators |
| CN115066806A (en) * | 2019-11-13 | 2022-09-16 | 株式会社Kmw | Dielectric ceramic filter |
| CN110224210B (en) * | 2019-05-30 | 2024-04-26 | 江苏灿勤科技股份有限公司 | Laminated dielectric filter comprising negative coupling structure |
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