CN107069154A - A kind of difference filter based on small-sized double dielectric resonator - Google Patents
A kind of difference filter based on small-sized double dielectric resonator Download PDFInfo
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- CN107069154A CN107069154A CN201710020361.6A CN201710020361A CN107069154A CN 107069154 A CN107069154 A CN 107069154A CN 201710020361 A CN201710020361 A CN 201710020361A CN 107069154 A CN107069154 A CN 107069154A
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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
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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
- H01P1/207—Hollow waveguide filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
- H01P7/105—Multimode resonators
Abstract
A kind of difference filter based on small-sized double dielectric resonator, including：Metallic cavity, two groups of difference incentive structures being fixedly installed in metallic cavity and cross section are in the bimodulus dielectric resonator that cross and cross upper surface are metal covering, two groups of microwave junctions of the connection corresponding with two groups of difference incentive structures being arranged on metallic cavity outer wall, the bimodulus dielectric resonator be equivalent to two identical Rectangular Enclosure with Participating Media resonators it is orthogonal after cut half and layer of metal coated on tangent plane and formed, each group of difference incentive structure each other mirror image and respectively with the equivalent both ends for cutting half Rectangular Enclosure with Participating Media resonator just to set, it is preferred that, cut half Rectangular Enclosure with Participating Media resonator intersection for two and be provided with two perturbation parts for orthogonal modes separation.The present invention is combined two-film technique with cutting half coating metal covering, can greatly be reduced the difference filter volume based on dielectric resonator, be solved the problem of difference filter volume based on dielectric resonator is larger in the prior art.
Description
Technical field
The present invention relates to radio communication technical field of filtering, more particularly to it is a kind of based on small-sized double dielectric resonator
Difference filter.
Background technology
Compared with single-end circuit, difference channel relies on the ability of its high antinoise and crosstalk in microwave circuit and communication system
In play extremely important role.It is adapted to this trend, many difference filters with superperformance are by widely
Explore and study.In the design of early stage, many difference filters employ printed-board technology, LTCC Technology
With substrate integrated waveguide technology realize resonator, but their pass-band loss and selectivity can not be reached in many practical applications
To gratifying level.
In order to efficiently solve above mentioned problem, dielectric resonator is widely used in modern wireless communication systems, this master
If because it has the advantage of high quality factor (Q), small size and excellent temperature stability.Recently, there is technical scheme proposition
It is utilized respectively TE11δMould Rectangular Enclosure with Participating Media resonator and TE01δMould annular dielectric resonator designs two kinds of difference filters.However,
The volume of designed difference filter is relatively large, because the dielectric resonator used is all with single mode operation.
The content of the invention
The present invention is directed to present in prior art, the problem of difference filter volume based on dielectric resonator is larger,
There is provided a kind of difference filter based on small-sized double dielectric resonator, the volume of wave filter can be effectively reduced.
The technical solution adopted for the present invention to solve the technical problems is：Construction is a kind of to be based on small-sized double dielectric resonance
The difference filter of device, including metallic cavity, two groups of difference incentive structures being fixedly installed in metallic cavity and cross section be in
Cross and cross upper surface for metal covering bimodulus dielectric resonator, be arranged on metallic cavity outer wall with two groups of difference
Two groups of microwave junctions of incentive structure correspondence connection, the bimodulus dielectric resonator is equivalent to two identical Rectangular Enclosure with Participating Media resonance
Half is cut after device is orthogonal and layer of metal is coated on tangent plane and is formed, each group of difference incentive structure each other mirror image and respectively with one
The equivalent both ends for cutting half Rectangular Enclosure with Participating Media resonator just to set, wherein, one group of difference incentive structure be used for signal input, separately
One group of difference incentive structure is used for signal output.
It is preferred that, equivalent two cut half Rectangular Enclosure with Participating Media resonator at intersection four turnings of formation, and at least one pair of is each other
Diagonal corner, which is provided with two, to be used to separate the perturbation that the short transverse along bimodulus dielectric resonator of orthogonal modes extends
Part, perturbation part and bimodulus dielectric resonator have identical dielectric constant.
It is preferred that, the cross section of the perturbation part in height is square.
It is preferred that, two equivalent main moulds for cutting half Rectangular Enclosure with Participating Media resonator are half TE11δMould.
It is preferred that, difference incentive structure be feed probes, including be sequentially connected the first current feed department, the second current feed department and
3rd current feed department, first current feed department and the 3rd current feed department are vertically arranged with metallic cavity inwall, second feed
Portion connects the first current feed department and the 3rd current feed department straight down.
It is preferred that, the microwave junction includes the inner wire docked with the first current feed department and is nested in outside inner wire
The outer conductor being connected with metallic cavity outer wall.
It is preferred that, the wave filter also includes being fixedly installed on for carrying the bimodulus being situated between for the metallic cavity bottom
The base of matter resonator.
It is preferred that, the metallic cavity include main part, metal cover board, the main part include four the first side walls and
The second sidewall of the adjacent the first side wall of four connections, two the first side walls of arbitrary neighborhood are vertically arranged, two of arbitrary neighborhood
Second sidewall is vertically arranged, and the relative the first side wall of each two installs one group of difference incentive structure.
Implement the difference filter based on small-sized double dielectric resonator of the present invention, have the advantages that：One
Aspect, according to the magnetic distribution of single Rectangular Enclosure with Participating Media resonator main mould, when rectangle resonator along the electric field plane of symmetry cut half and
When coating metal covering on tangent plane, the electromagnetic field of main mould will not change, and resonator of the present invention can be regarded as
Two identicals cut the orthogonal formation of half Rectangular Enclosure with Participating Media resonator, and compared with traditional bimodulus dielectric resonator, its size can subtract
It is half as large；On the other hand, the difference that equivalent two main moulds for cutting half Rectangular Enclosure with Participating Media resonator can be pointed to its both sides by one
Structural excitation is encouraged in shunt excitation, and due to using dual-mode resonator, wave filter only needs a metallic cavity, efficiently reduces
The volume of wave filter；
Turned it is further preferred that the present invention can also cut that half Rectangular Enclosure with Participating Media resonator is crossed to form at two a pair are relative
Two are set at angle is used for the perturbation part that orthogonal modes is separated.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the top view of the preferred embodiment of the difference filter of the invention based on small-sized double dielectric resonator；
Fig. 2 is the structural representation of bimodulus dielectric resonator；
Fig. 3 is the side perspective of the preferred embodiment of the difference filter of the invention based on small-sized double dielectric resonator
Figure；
Fig. 4 is single Rectangular Enclosure with Participating Media resonator TE11δ zThe electric field schematic diagram of pattern；
Fig. 5 is to cut the TE of half Rectangular Enclosure with Participating Media resonator half11δ zThe electric field schematic diagram of pattern；
Fig. 6 is the parameter a and coefficient of coup k of perturbation part12 dBetween relation；
Fig. 7 is the parameter l of feed probes1And l3With external sort factor Qe dBetween relation；
Fig. 8 is emulation and the measured result schematic diagram of difference bimodulus dielectric filter.
Embodiment
The resonator that is used of difference filter of the present invention be equivalent to two identical Rectangular Enclosure with Participating Media resonators it is orthogonal after
Cut half and layer of metal is coated on tangent plane and formed, according to the magnetic distribution of single Rectangular Enclosure with Participating Media resonator main mould, work as rectangle
When resonator cuts half along the electric field plane of symmetry and coats metal covering on tangent plane, the electromagnetic field of main mould will not change, with biography
The bimodulus dielectric resonator of system is compared, and its size can reduce half；Equivalent two cut the main mould of half Rectangular Enclosure with Participating Media resonator
It can be encouraged by a difference incentive structure for being pointed to its both sides, due to using dual-mode resonator, wave filter is only needed
A metallic cavity is wanted, the volume of wave filter is efficiently reduced.
In order to be better understood from above-mentioned technical proposal, below in conjunction with Figure of description and specific embodiment to above-mentioned
Technical scheme is described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the application skill
The detailed description of art scheme, rather than the restriction to technical scheme, in the case where not conflicting, the embodiment of the present invention
And the technical characteristic in embodiment can be mutually combined.
With reference to Fig. 1-2, in preferred embodiment, difference filter includes metallic cavity 1, is fixedly installed in metallic cavity 1
Two groups of difference incentive structures 21,22 and bimodulus dielectric resonator 3, be arranged on the outer wall of metallic cavity 1 with two groups of difference
In two groups of microwave junctions of the correspondence connection of incentive structure 21,22, such as figure, port 1-1 ' is one group of microwave junction, and port 2-2 ' is
Another group of microwave junction.
With reference to Fig. 2, the cross section of bimodulus dielectric resonator 3 is in cross and cross upper surface is metal covering, and its is substantial
Be equivalent to two Rectangular Enclosure with Participating Media resonators of identical it is orthogonal after cut half and layer of metal coated on tangent plane and formed.
With reference to Fig. 1 and Fig. 3 is combined, it is l that metallic cavity 1, which includes height,4Main part and the capping main part gold
Belong to cover plate, the main part includes the second sidewall 12 of four the first side walls 11 and the adjacent the first side wall 11 of four connections, the
The width of side wall 11 is more than the width of second sidewall 12, and two the first side walls 11 of arbitrary neighborhood are vertically arranged, arbitrary neighborhood
Two second sidewalls 12 be vertically arranged.In fact, its cross section is equivalent to a length of side for w1Square four turning
It is removed and is formed.
Wherein, the relative the first side wall 11 of each two installs one group of difference incentive structure 21 or difference incentive structure 22.
Difference incentive structure 21 each other mirror image and with the equivalent both ends for cutting half Rectangular Enclosure with Participating Media resonator just to set, similarly,
Difference incentive structure 22 each other mirror image and with the equivalent both ends for cutting half Rectangular Enclosure with Participating Media resonator just to set.One group of difference
Incentive structure 21/22 is divided to be inputted for signal, another group of difference incentive structure 22/21 is used for signal output, and they have identical
Size.In preferred embodiment, difference incentive structure 21,22 be feed probes, specifically include be sequentially connected the first current feed department,
Second current feed department and the 3rd current feed department, first current feed department and the 3rd current feed department are vertical with metallic cavity inwall to be set
Put, second current feed department connects the first current feed department and the 3rd current feed department, i.e. the first current feed department and the 3rd feed straight down
The equal length in portion.As in Fig. 3, the first current feed department and the 3rd current feed department length are l1, the second current feed department length is l2。
With continued reference to Fig. 1 and Fig. 3, equivalent two cut half Rectangular Enclosure with Participating Media resonator at intersection four turnings of formation.It is excellent
Choosing, at least one pair of corner diagonal each other be provided with two be used for separate two orthogonal modes along bimodulus dielectric resonator
The perturbation part 4 of 3 short transverse extension.Perturbation part 4 and bimodulus dielectric resonator 3 have identical dielectric constant.The present embodiment
In, dielectric constant and the loss angle tangent difference 38 and 2.5 × 10 of bimodulus dielectric resonator 3-4。
As in Fig. 1, preferred embodiment is respectively provided with a perturbation part 4 in a pair of corners diagonal each other.Certainly, also
Perturbation part 4 can be arranged on to another pair corner diagonal each other, or perturbation part 4 is respectively provided with 4 corners.
In preferred embodiment, the cross section of the perturbation part 4 in the height direction is square.It is understood that specific
Shape be not limited to this, cross section can also be that rectangle, or perturbation part 4 can also be the even irregular bar of cylindricality
Shape, these are all within protection scope of the present invention.
In addition, in the present embodiment, the perturbation part 4 is integrally formed with the bimodulus dielectric resonator 3.Need clearly
It is to be integrally formed a preferred scheme only of the invention, actually perturbation part 4 can also be and bimodulus dielectric resonator 3
The structure of separation, these are all within protection scope of the present invention.
With continued reference to Fig. 3, the height of microwave junction is l3, the microwave junction include docked with the first current feed department in lead
Body and the outer conductor being connected with the outer wall of metallic cavity 1 being nested in outside inner wire.In specific embodiment, the first current feed department and
Inner wire is directly connected to.
With reference to Fig. 3, the wave filter also includes being fixedly installed on described for carrying on the bottom of the metallic cavity 1
The base 5 of bimodulus dielectric resonator 3.Specifically, base 5 includes integrally formed square floor 51 and vertical with square floor
Column structure 52, bimodulus dielectric resonator 3 is fixed by bonding mode with column structure 52, and the corner of square floor 51 passes through spiral shell
Nail is fixed on the bottom of metallic cavity 1.
In the present embodiment, base 5 is specially Al2O3Material.Certainly, specific material is not limited to this, as long as base 5 possesses
Certain rigidity can be used for load-bearing.
The operation principle of the present invention is introduced with reference to Fig. 4 and Fig. 5 and above-described embodiment.
As shown in figure 4, Rectangular Enclosure with Participating Media resonator TE11δ zClosed loop distribution, and it is presented in the electric field of pattern in resonator
It is mutually orthogonal with plane of symmetry y=A/2.According to field boundary condition, one layer of gold is covered on electric field plane of symmetry y=A/2
Category face (Approximate Equivalent is desired electrical wall) will not change TE11δ zThe original field distribution of mould, as shown in figure 5, this cuts half rectangle Jie
Matter resonator can be as shown in Figure 4 Rectangular Enclosure with Participating Media resonator cut half along electric field plane of symmetry y=A/2 and coat one on tangent plane
Layer metal is constituted.
Based on this principle, resonator of the present invention be equivalent to two identical Rectangular Enclosure with Participating Media resonators it is orthogonal after cut
Layer of metal formation partly and on tangent plane is coated (as shown in Fig. 2 wherein, A, B, L represent single Rectangular Enclosure with Participating Media resonator respectively
High, length and width).Compared with traditional bimodulus dielectric resonator, its size reduces half.
According to the structure of bimodulus dielectric resonator 3, there are a pair of orthogonal modes with identical resonance frequency, i.e., half in it
TE11δ xWith half TE11δ yPattern, the two patterns can be encouraged by one group of feed probes difference.Wherein, difference incentive structure 21 swashs
Encourage half TE11δ xPattern, difference incentive structure 22 encourages half TE11δ yPattern, two feed probes of each group of difference incentive structure are drawn
Entering is used to encourage corresponding half TE11δThe constant amplitude reverse current of pattern.It can be seen from reciprocity principle, from being operated in half TE11δPattern
Dielectric resonator on the signal that extracts it is also necessarily reverse.
Four feed probes are used to constitute two pairs of Differential Input/outputs, they be of the same size and its length and
Highly determine input/output coupling amount, i.e. external sort factor Qe d.Generally, coupling is not present between orthogonal mode.Such as
Fruit orthogonal modes needs to couple, then their magnetic distribution just should multilated.Cross section in the present invention is in side
The perturbation part 4 of shape is the separation for two orthogonal modes, and its size is a*a*A/2.The coefficient of coup between two patterns, i.e.,
k12 d, determined by the size of perturbation part 4.From fig. 6, it can be seen that k12 dValue with a increase and increase.According to Fig. 7 as can be seen that
As feed probes parameter l1Or l3During increase, Qe dValue reduce.
Analyzed based on more than, we design a centre frequency for 1.75GHz, and 0.04dB ripples relative bandwidth (FBW) is
0.42% two order difference Chebyshev's bandpass filters.According to wave filter design objective, the lump member of lowpass prototype filter
Part value is：g0=1, g1=0.6508, g2=0.5371.The Q that difference filter design is wantede dAnd k12 dIt can be obtained by equation below
Arrive：
Finally, according to the Q of extractione dAnd k12 d, the correspondingly-sized of difference filter structure can determine that after simulation optimization as
Under：l1=4.65mm, l2=20mm, l3=30mm, l4=35mm, w1=45mm, a=1.6mm, A=31mm, B=24.5mm, L
=11mm.
Fig. 8 gives emulation and the measured result of the difference filter of proposition, with good uniformity.In figure, Sdd11
Represent reflectance factor of the difference mode signal in port 1-1 '；Sdd21Represent transmission system of the difference mode signal from port 1-1 ' to port 2-2 '
Number；Scc21Represent common-mode signal from port 1-1 ' to port 2-2 ' transmission coefficient.It will be apparent from this figure that the differential mode measured
Passband central frequency is that return loss is better than 15dB in 1.75GHz, passband, and emulation and the minimum insertion loss surveyed are about
Common mode inhibition in 0.73dB and 0.9dB, and differential mode passband is more than 40dB.
In summary, implement the difference filter based on small-sized double dielectric resonator of the present invention, have with following
Beneficial effect：On the one hand, according to the magnetic distribution of single Rectangular Enclosure with Participating Media resonator main mould, when rectangle resonator is symmetrical along electric field
When face cuts half and coats metal covering on tangent plane, the electromagnetic field of main mould will not change, and resonator of the present invention can
To regard that two identicals cut the orthogonal formation of half Rectangular Enclosure with Participating Media resonator, compared with traditional bimodulus dielectric resonator, its chi as
It is very little to reduce half；On the other hand, equivalent two main moulds for cutting half Rectangular Enclosure with Participating Media resonator can be pointed to it by one
The difference incentive structure excitation of both sides, due to using dual-mode resonator, wave filter only needs a metallic cavity, effectively
Ground reduces the volume of wave filter；It is further preferred that the present invention can also cut half Rectangular Enclosure with Participating Media resonator at two intersects shape
Into a pair of opposite corners set two be used for orthogonal modes separate perturbation part.
Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific
Embodiment, above-mentioned embodiment is only schematical, rather than restricted, one of ordinary skill in the art
Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make a lot
Form, these are belonged within the protection of the present invention.
Claims (8)
1. a kind of difference filter based on small-sized double dielectric resonator, it is characterised in that set including metallic cavity, fixation
Two groups of difference incentive structures in metallic cavity and cross section are put in the bimodulus that cross and cross upper surface are metal covering
Dielectric resonator, two groups of microwave junctions of the connection corresponding with two groups of difference incentive structures being arranged on metallic cavity outer wall, institute
State bimodulus dielectric resonator be equivalent to two identical Rectangular Enclosure with Participating Media resonators it is orthogonal after cut half and one layer of gold coated on tangent plane
Category formed, each group of difference incentive structure each other mirror image and respectively with the equivalent both ends for cutting half Rectangular Enclosure with Participating Media resonator
Just to setting, wherein, one group of difference incentive structure is inputted for signal, and another group of difference incentive structure is used for signal output.
2. the difference filter according to claim 1 based on small-sized double dielectric resonator, it is characterised in that equivalent
Two cut half Rectangular Enclosure with Participating Media resonator and form four turnings in intersection, at least one pair of corner diagonal each other is provided with two
Individual to be used to separate the perturbation part that the short transverse along bimodulus dielectric resonator of orthogonal modes extends, perturbation part and bimodulus medium are humorous
The utensil that shakes has identical dielectric constant.
3. the difference filter according to claim 2 based on small-sized double dielectric resonator, it is characterised in that described
The cross section of perturbation part in height is square.
4. the difference filter according to claim 1 based on small-sized double dielectric resonator, it is characterised in that equivalent
Two main moulds for cutting half Rectangular Enclosure with Participating Media resonator be half TE11δMould.
5. the difference filter according to claim 1 based on small-sized double dielectric resonator, it is characterised in that difference
Incentive structure is feed probes, including the first current feed department, the second current feed department and the 3rd current feed department being sequentially connected, described first
Current feed department and the 3rd current feed department are vertically arranged with metallic cavity inwall, and second current feed department connects the first feedback straight down
Electric portion and the 3rd current feed department.
6. the difference filter according to claim 5 based on small-sized double dielectric resonator, it is characterised in that described
Microwave junction includes the inner wire docked with the first current feed department and is nested in being connected with metallic cavity outer wall outside inner wire
Outer conductor.
7. the difference filter according to claim 1 based on small-sized double dielectric resonator, it is characterised in that described
Wave filter also includes the base for being used to carry the bimodulus dielectric resonator for being fixedly installed on the metallic cavity bottom.
8. the difference filter according to claim 1 based on small-sized double dielectric resonator, it is characterised in that described
Metallic cavity includes main part, metal cover board, and the main part includes four the first side walls and adjacent first side of four connections
The second sidewall of wall, two the first side walls of arbitrary neighborhood are vertically arranged, and two second sidewalls of arbitrary neighborhood are vertically arranged, often
Two relative the first side walls install one group of difference incentive structure.
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| CN109411853A (en) * | 2018-09-04 | 2019-03-01 | 香港凡谷發展有限公司 | A kind of high tri- mould dielectric resonance hollow structure of Q of cavity and the filter containing the resonance structure |
| CN109713434A (en) * | 2019-01-30 | 2019-05-03 | 南通大学 | A kind of diectric antenna of the coplanar feed of millimeter wave difference |
| CN110190367A (en) * | 2019-05-23 | 2019-08-30 | 复旦大学 | A kind of ultra wide band differential lines common-mode noise filter |
| WO2020124435A1 (en) * | 2018-12-19 | 2020-06-25 | 华为技术有限公司 | Resonance unit and dielectric filter |
| WO2020259028A1 (en) * | 2019-06-28 | 2020-12-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Resonator apparatus, filter apparatus as well as radio frequency and microwave device |
| CN113036328A (en) * | 2021-03-25 | 2021-06-25 | 南通大学 | Dual-channel filter with different center frequencies |
| CN113036438A (en) * | 2021-03-23 | 2021-06-25 | 南通大学 | Broadband low-profile dielectric resonator antenna for beamforming application |
| CN113904083A (en) * | 2021-10-09 | 2022-01-07 | 南通大学 | Integrated structure of filter and power divider |
| CN115295991A (en) * | 2022-07-15 | 2022-11-04 | 南通先进通信技术研究院有限公司 | Double-passband filtering power divider based on multimode resonator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109411853A (en) * | 2018-09-04 | 2019-03-01 | 香港凡谷發展有限公司 | A kind of high tri- mould dielectric resonance hollow structure of Q of cavity and the filter containing the resonance structure |
| CN109411853B (en) * | 2018-09-04 | 2020-11-20 | 香港凡谷發展有限公司 | Cavity high-Q three-mode dielectric resonance hollow structure and filter comprising same |
| US11735801B2 (en) | 2018-09-04 | 2023-08-22 | Hongkong Fingu Development Company Limited | High-q triple-mode cavity dielectric resonant hollow structure and filter with resonant structure |
| WO2020124435A1 (en) * | 2018-12-19 | 2020-06-25 | 华为技术有限公司 | Resonance unit and dielectric filter |
| CN109713434A (en) * | 2019-01-30 | 2019-05-03 | 南通大学 | A kind of diectric antenna of the coplanar feed of millimeter wave difference |
| CN110190367A (en) * | 2019-05-23 | 2019-08-30 | 复旦大学 | A kind of ultra wide band differential lines common-mode noise filter |
| WO2020259028A1 (en) * | 2019-06-28 | 2020-12-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Resonator apparatus, filter apparatus as well as radio frequency and microwave device |
| CN113036438A (en) * | 2021-03-23 | 2021-06-25 | 南通大学 | Broadband low-profile dielectric resonator antenna for beamforming application |
| CN113036438B (en) * | 2021-03-23 | 2022-12-06 | 南通大学 | Broadband low-profile dielectric resonator antenna for beamforming application |
| CN113036328A (en) * | 2021-03-25 | 2021-06-25 | 南通大学 | Dual-channel filter with different center frequencies |
| CN113904083A (en) * | 2021-10-09 | 2022-01-07 | 南通大学 | Integrated structure of filter and power divider |
| CN115295991A (en) * | 2022-07-15 | 2022-11-04 | 南通先进通信技术研究院有限公司 | Double-passband filtering power divider based on multimode resonator |
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| CN107069154B (en) | 2019-05-28 |
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