CN109346807A - A kind of adjustable bimodule band-pass filter of magnetic - Google Patents
A kind of adjustable bimodule band-pass filter of magnetic Download PDFInfo
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- CN109346807A CN109346807A CN201811139843.4A CN201811139843A CN109346807A CN 109346807 A CN109346807 A CN 109346807A CN 201811139843 A CN201811139843 A CN 201811139843A CN 109346807 A CN109346807 A CN 109346807A
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- ferrite
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- hole
- resonant cavity
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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
- H01P1/215—Frequency-selective devices, e.g. filters using ferromagnetic material
- H01P1/218—Frequency-selective devices, e.g. filters using ferromagnetic material the ferromagnetic material acting as a frequency selective coupling element, e.g. YIG-filters
-
- 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
- H01P1/215—Frequency-selective devices, e.g. filters using ferromagnetic material
- H01P1/217—Frequency-selective devices, e.g. filters using ferromagnetic material the ferromagnetic material acting as a tuning element in resonators
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Abstract
The invention discloses a kind of adjustable bimodule band-pass filters of magnetic, belong to microwave and millimeter wave field.The filter includes medium substrate, set on the two metal layers of medium substrate upper and lower surfaces；It is connected between two metal layers by plated-through hole array, medium substrate, two metal layers constitute a bimodulus resonant cavity with plated-through hole array；The surrounding setting of bimodulus resonant cavity inner close fitting plated-through hole array is provided with ferrite in through-hole there are four through-hole.The present invention uses bimodulus resonant cavity, reduces the circuit area of filter, also has many advantages, such as that insertion loss is low, the good harmonic responses of selectivity are good.Ferritic application not only changes the resonance frequency of bimodulus resonant cavity, while also can control the stiffness of coupling between two degenerate modes.The working frequency of filter of the present invention increases with applied bias magnetic field strength toward high frequency direction movement, and dynamic adjustable extent is wide, and the flexible design to bandwidth may be implemented.
Description
Technical field
The invention belongs to microwave and millimeter wave fields, and in particular to a kind of adjustable bimodule band-pass filter of magnetic.
Background technique
Crucial composition device of the tunable filter as the following intelligent wireless communication and radar system, is not only responsible for control
The effect of useful signal, inhibition harmful interference frequency processed, additionally it is possible to support multichannel communication, efficiently solve spectrum congestion and ask
Topic.And multiband, miniaturization and the integrated application demand of following intelligent wireless communication and radar system, to adjustable filtering
The development of device performance and in terms of put forward increasingly higher demands again.Tunable filter is that one kind can be realized filtering
The structural rearrangement of device and the Novel Filter of frequency tuning change generally by tuned element is loaded in filter construction
The device property and impedance effect for becoming filter, obtain different resonance frequency and bandwidth of operation.Adjustable microwave filter is not only
It can satisfy adaptive pre- frequency-selecting and multi-channel transmission requirement, effectively solve interfering with each other for more equipment rooms and asked with electromagnetic compatibility
Topic, and greatly reduces the size and sophistication of system, is to realize wireless communication system multiband, miniaturization and intelligentized
A kind of ideal component.Different from traditional single-frequency filter, tunable filter can be by changing the biasing of tuned cell come real
Existing filter centre frequency and pass band width it is separately adjustable, it might even be possible to the flexibly form factor of control filter and transmission zero
Point position.Therefore, tunable filter not only has in terms of the compatibility of the utilization rate of frequency spectrum resource and frequency range and has great advantage, and
And meets the needs of Modern Communication System is flexible and changeable to equipment.
For a long time, since electric tuning speed is fast, the small equal many merits of insertion loss, the research of electric tunable filter is always
It is concerned.Electric tunable filter is the state for changing PIN switch by the way that bias supply is adjusted or the appearance of varactor
Value, to change the electrical characteristics such as element characteristic and the impedance effect of filter, obtains different resonance frequency and bandwidth of operation, real
The structural rearrangement of existing filter and frequency tuning.And magnetic tunable filter its Tuning Principle based on ferromagnetic material is to pass through adjusting
The size of externally-applied magnetic field realizes RF and microwave device so that the distribution to magnetic field has an impact to change the magnetic conductivity of ferromagnetic material
The frequency or bandwidth of part and circuit it is adjustable.Compared with electric tunable filter, this magnetic tunable filter has Q value height, work
The many merits such as wide frequency range, high power capacity.
Substrate integration wave-guide (SubstrateIntegratedWaveguide, SIW) is used as a kind of Novel Delivery cable architecture
Have the advantages that rectangular waveguide and microstrip line planar structure both circuits simultaneously.But adjustable SIW filter reported at present is all
The design method of single-chamber single mode is generallyd use, the problem of this undoubtedly will result in terms of size and cost of manufacture.In addition, based on single
The filter of chamber single mode generally requires to introduce additional cross-coupling to realize transmission zero, therefore in frequency selectivity and stopband
Performance is poor in terms of characteristic.And the theoretical of multimode cavity is used to realize that Two-mode Coupling filter is the important of diminution waveguide filter
One of approach, and the phase by controlling each mode has the selection characteristic of filter generating transmission zero and changes greatly very much
It is kind.As it can be seen that exploring one of the important trend that the tunable filter based on bimodulus even multimode is current Novel Filter development.
Summary of the invention
The main purpose of the present invention is to provide a kind of adjustable bimodule band-pass filters of the magnetic of substrate integration wave-guide, this is adjustable
The adjusting of band connection frequency and bandwidth may be implemented in bandpass filter, can be used for high data rate communication systems radio-frequency front-end.
The invention is realized by the following technical scheme: a kind of adjustable bimodule band-pass filter of magnetic, including medium substrate 2, sets
In the first metal layer 1 of medium substrate lower surface and the second metal layer 3 of upper surface；The first metal layer 1 and second metal layer 3 it
Between by plated-through hole array 4 be connected；Medium substrate 2 and the first metal layer 1, second metal layer 3 and plated-through hole array 4
Constitute a bimodulus resonant cavity 5.
It is arranged in the surrounding of 5 inner close fitting plated-through hole array 4 of bimodulus resonant cavity there are four through-hole, the through-hole is set to
In medium substrate 2, be provided in the through-hole of upper and lower two sides the first ferrite 6, the left and right sides through-hole in be provided with the second iron
The shape of oxysome 7, first ferrite 6 and the second ferrite 7 and the shape of its locating through-hole are coincide in order to fixation, described
The thickness of first ferrite 6 and the second ferrite 7 is identical as the thickness of medium substrate 2.
Setting is there are two input/output port in second metal layer 3, the input/output port be all made of co-planar waveguide 8 with
The structure that microstrip feed line 9 is connected, the characteristic impedance of the microstrip feed line 9 are 50 ohm；The input/output port is in left and right
The outside that bimodulus resonant cavity 5 is arranged in of mirror symmetry, entire filter construction are also in left and right mirror symmetry.
The bimodulus resonant cavity 5 is rectangle substrate integrated waveguide resonant cavity or circular substrate integrated wave guide resonance chamber.
The plated-through hole array 4 is made of cylindrical body or cuboid plated-through hole.
Four through-holes in medium substrate 2 can with the first ferrite 6 and the second ferrite 7 being disposed therein
Think rectangle or rectangular.
Further, the upper and lower surfaces of first ferrite 6 and the second ferrite 7 are all covered with copper sheet, cover
The surrounding for being placed on the copper sheet of 7 lower surface of the first ferrite 6 and the second ferrite is weldingly connected with the first metal layer 1, is covered in
The surrounding of the copper sheet of 7 upper surface of one ferrite 6 and the second ferrite is weldingly connected with second metal layer 3, thus further fixes
Ferrite Material simultaneously reduces radiation loss.
The initial passband central frequency of magnetic of the invention is adjustable bimodule band-pass filter is determined by the length and width of bimodulus resonant cavity 5
Fixed, the passband of filter is realized by the coupling between the TE102 mould in bimodulus resonant cavity 5 and TE201 mould, is suitably designed double
The length of mode resonant cavity 5 and the ratio of width can realize the adjusting of the initial passband coefficient of coup, i.e., changeable filter passband
Bandwidth；The first ferrite 6 being set in medium substrate 2 is located at the magnetic field most strong position of TE201 mould, to its applied bias magnetic field
The resonance frequency of adjustable TE201 mould；Second ferrite 7 is located at the magnetic field most strong position of TE102 mould, to its applied bias magnetic field
The resonance frequency of adjustable TE102 mould；Therefore, the passband central frequency of filter can be by the first ferrite 6 and the second ferrite 7
It adjusts, with the increase of the first ferrite 6 and applied bias the magnetic field strength H0 and H1 of the second ferrite 7, filter passband
Centre frequency it is mobile toward high frequency direction；During the tuning of filter passband centre frequency, pass band width can also become
Change.Further, can by the first ferrite 6 and the second ferrite 7 be arranged different applied bias magnetic field strengths come
The stiffness of coupling between TE201 mould and TE102 mould is adjusted, to change pass band width.In addition, since passband is by bimodulus resonant cavity
It realizes, therefore respectively has a transmission zero in passband two sides, adjust the parameter for being set to the input and output feeder line of second metal layer 3
The position of adjustable transmission zero.
Compared with prior art, the present invention its advantages and beneficial effects is:
1, compared with single mode filter, the present invention uses the filter of bimodulus resonant cavity realization by the quantity of required resonator
Half can be reduced, to reduce the circuit area of filter.And also low, the good harmonics restraint spy of selectivity with insertion loss
The advantages that property is good.And use and design-adjustable is carried out to dual-mode resonator, it also can be used while reducing circuit size point
The stiffness of coupling for not adjusting the resonance frequency of each mode and changing filter saves coupling to adjust the bandwidth of filter
Close the load of intensity adjustment element.
2, the spy that the equivalent permeability of the tunable filter application Ferrite Material changes with applied bias magnetic field strength
Point is realized, not only can change the resonance frequency of substrate integration wave-guide bimodulus resonant cavity, while also can control in resonant cavity two
Stiffness of coupling between degenerate mode.Compared with traditional adjustable substrate integral wave guide filter of electricity, the work of magnetic tunable filter
Frequency is as applied bias magnetic field strength increases toward high frequency direction movement, and dynamic adjustable extent is wider, and may be implemented
To the flexible design of bandwidth, filter shape keeps degree to improve, and sets in the following multiband, miniaturization and intelligent wireless communication
There is wide application potential in standby and system.
Detailed description of the invention
Fig. 1 is a kind of adjustable bimodule band-pass filter schematic three dimensional views of magnetic；
Fig. 2 is a kind of adjustable bimodule band-pass filter top view of magnetic；
Fig. 3 is a kind of field distribution of the adjustable bimodule band-pass filter of magnetic as applied bias magnetic field H0=H1=0.1T
Figure；
Fig. 4 is a kind of Distribution of Magnetic Field of the adjustable bimodule band-pass filter of magnetic as applied bias magnetic field H0=H1=0.1T
Figure；
Fig. 5 is the transmission characteristic that a kind of adjustable bimodulus bandpass filter centre frequency of magnetic is adjusted with applied bias magnetic field strength
Curve；
Fig. 6 is the transfer curve that a kind of adjustable bimodule band-pass filter TE102 mould of magnetic adjusts Time Bandwidth variation；
Fig. 7 is the transfer curve that a kind of adjustable bimodule band-pass filter TE201 mould of magnetic adjusts Time Bandwidth variation；
Fig. 8 is the transfer curve that a kind of adjustable bimodule band-pass filter bimodulus of magnetic adjusts Time Bandwidth variation；
Specific embodiment
With reference to the accompanying drawings and examples, the technical schemes of the invention are described in detail.
Embodiment
The adjustable bimodulus bandpass filter structures of magnetic in the present embodiment as shown in Figure 1, medium substrate 2 using with a thickness of
The Rogersduroid6202 substrate of 0.726mm, relative dielectric constant εr=2.9, losstangenttanδ=0.0015.
Specifically, in the present embodiment, the bimodulus resonant cavity 5 is rectangle substrate integrated waveguide resonant cavity；The metal
Change through-hole array 4 to be made of cuboid plated-through hole, the plated-through hole length of plated-through hole array 4 is 0.9mm, adjacent
Spacing between plated-through hole is 0.4mm；The through-hole and position positioned at 5 inner close fitting boundary through-hole array 4 of bimodulus resonant cavity
Ferritic shape in through-hole is cuboid；First ferrite 6 and the second ferrite 7 are all made of microwave yttrium iron pomegranate
Stone (YIG) ferrite；The ferritic upper and lower surfaces are all covered with copper sheet, the copper sheet positioned at ferrite lower surface
Surrounding is weldingly connected with the first metal layer 1, welds positioned at the surrounding of the copper sheet of ferrite upper surface and the second metal layer 3
It connects connected, thus further fixes Ferrite Material and reduce radiation loss；First ferrite 6 and the second ferrite 7
Shape can not be identical with size, but in the present embodiment, is all made of the identical cuboid of size.The input/output port is adopted
The structure that is connected with co-planar waveguide 8 with microstrip feed line 9 and the two sides for being symmetrically located in bimodulus resonant cavity 5.
The specific structure dimension mark of the magnetic is adjustable bimodule band-pass filter is as shown in Fig. 2, specific corresponding parameter such as following table
It is shown:
| Symbol | It is worth (mm) | Symbol | It is worth (mm) | Symbol | It is worth (mm) |
| W | 16.6 | L | 15.5 | Wf | 1 |
| Lf | 10 | Lx | 1.3 | Lp | 4.7 |
| Ws | 3 | Wp | 1.3 |
The working method of the magnetic is adjustable bimodule band-pass filter are as follows: the first ferrite 6 and the second ferrite 7 control bimodulus are humorous
The resonance frequency of degenerate mode TE102 and TE201 mould in vibration chamber 5；It is humorous with the increase of applied bias magnetic field strength H0 and H1
Vibration frequency can be mobile toward high frequency direction；If to the first ferrite 6 and the additional different biased magnetic field strength of the second ferrite 7
When, the tuning degree of the resonance frequency of TE102 mould and TE201 mould is just different, and the stiffness of coupling between two degenerate modes can also be sent out
It is raw to change, thus tuned filter bandwidth.
Through Electromagnetic Simulation, the magnetic is adjustable bimodule band-pass filter is disposed as 0.1T in applied bias magnetic field strength H0 and H1
When distribution map of the electric field as shown in figure 3, its corresponding Distribution of Magnetic Field is as shown in Figure 4.From magnetic distribution figure as it can be seen that TE102 mould
Concentrate on the periphery position of the resonant cavity where the first ferrite 6 and the second ferrite 7 respectively with the maximum magnetic field strength of TE201 mould
It sets, and these positions are exactly electric field strength most weak-strong test.Therefore, being tuned to TE102 mode will not influence TE201 mode
Magnetic distribution, vice versa.
In the case where each relevant parameter in Fig. 2 has been determined, Fig. 5 show the magnetic adjustable double obtained through Electromagnetic Simulation
The transmission characteristic when frequency tuning of mould bandpass filter, as seen from the figure, when applied bias magnetic field strength from 0T adjust to
When 0.425T, the passband central frequency tuning range of filter is 12GHz to 15.5GHz, and frequency-tuning range reaches 29.2%,
The variation range of insertion loss is 0.63dB to 3.03dB, and with the tuning of centre frequency, the variation range of pass band width is
0.7GHz to 0.83GHz, corresponding relative bandwidth variation range are 1.47%-3.82%.
Fig. 6 show adjust TE102 mould resonance frequency, filter passband bandwidth change when transfer curve, when
H0 is set as 0.2T, and when H1 is from 0.1875T adjusting to 0.275T, the variation range of pass band width is 0.47GHz to 0.95GHz,
Corresponding relative bandwidth variation range is 3.7%-7.32%.
Fig. 7 show adjust TE201 mould resonance frequency, filter passband bandwidth change when transfer curve, when
H0 is adjusted from 0.075T to 0.2T, and when H1 is set as 0.2T, the variation range of pass band width is 0.97GHz to 0.52GHz, corresponding
Relative bandwidth variation range be 7.8%-4%.
Fig. 8 show while adjusting the resonance frequency of bimodulus, transfer curve when filter passband bandwidth changes, when
From H0=0.2125T, H1=0.1875T is adjusted to H0=0.15T in applied bias magnetic field, when H1=0.25T, the change of pass band width
Change range is 0.41GHz to 1.0GHz, and corresponding relative bandwidth variation range is 3.2%-7.84%.
As can be seen that a kind of adjustable bimodule band-pass filter of magnetic of the present invention not only can be in wider frequency model
The interior tuning for realizing filter centre frequency is enclosed, the bandwidth of filter can also be adjusted, but also there is filtering performance
Stablize, the advantages such as band-pass behavior is controllable, insertion loss is low.The applied bias magnetic field strength of Ferrite Material is loaded on by adjusting
The tunable filter of various frequencies, bandwidth and filtering performance requirement can be achieved in parameter, the invention.
The foregoing is merely preferred embodiments of the invention, are not intended to limit the invention, all in spirit and original of the invention
Within then, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of adjustable bimodule band-pass filter of magnetic, including medium substrate 2, set on the first metal layer 1 of medium substrate lower surface
With the second metal layer 3 of upper surface；It is connected between the first metal layer 1 and second metal layer 3 by plated-through hole array 4；It is situated between
Matter substrate 2 and the first metal layer 1, second metal layer 3 and plated-through hole array 4 constitute a bimodulus resonant cavity 5；
It is characterized by: there are four through-hole, through-holes for the surrounding setting of the 5 inner close fitting plated-through hole array 4 of bimodulus resonant cavity
It is set in medium substrate 2, the first ferrite 6 is provided in the through-hole of upper and lower two sides, is provided in the through-hole of the left and right sides
The thickness of second ferrite 7, first ferrite 6 and the second ferrite 7 is identical as the thickness of medium substrate 2.
2. a kind of adjustable bimodule band-pass filter of magnetic as described in claim 1, it is characterised in that: the bimodulus resonant cavity 5
Outside setting there are two be in left and right mirror symmetry input/output port, the input/output port be all made of co-planar waveguide 8 with
The structure that microstrip feed line 9 is connected.
3. a kind of adjustable bimodule band-pass filter of magnetic as claimed in claim 1 or 2, it is characterised in that: the bimodulus resonant cavity 5
For rectangle substrate integrated waveguide resonant cavity or circular substrate integrated wave guide resonance chamber.
4. a kind of adjustable bimodule band-pass filter of magnetic as described in claim 1, it is characterised in that: the plated-through hole array
4 are made of cylindrical body or cuboid plated-through hole.
5. a kind of adjustable bimodule band-pass filter of magnetic as described in claim 1, it is characterised in that: 6 He of the first ferrite
The shape of second ferrite 7 is identical as the shape of its locating through-hole.
6. a kind of adjustable bimodule band-pass filter of magnetic as claimed in claim 5, it is characterised in that: described to be located at medium substrate 2
In four through-holes with the first ferrite 6 and the second ferrite 7 that are disposed therein be rectangle or rectangular.
7. a kind of adjustable bimodule band-pass filter of magnetic as claimed in claim 2, it is characterised in that: the spy of the microstrip feed line 9
Levying impedance is 50 ohm.
8. a kind of adjustable bimodule band-pass filter of magnetic as described in claim 1, it is characterised in that: 6 He of the first ferrite
The upper and lower surfaces of second ferrite 7 are all covered with copper sheet, are covered in 7 lower surface of the first ferrite 6 and the second ferrite
The surrounding of copper sheet be weldingly connected with the first metal layer 1, be covered in the copper sheet of 7 upper surface of the first ferrite 6 and the second ferrite
Surrounding be weldingly connected with second metal layer 3.
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| CN201811139843.4A CN109346807A (en) | 2018-09-28 | 2018-09-28 | A kind of adjustable bimodule band-pass filter of magnetic |
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| CN201811139843.4A CN109346807A (en) | 2018-09-28 | 2018-09-28 | A kind of adjustable bimodule band-pass filter of magnetic |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839158A (en) * | 2021-09-26 | 2021-12-24 | 华南理工大学 | Four-mode dielectric waveguide filter |
| CN114614938A (en) * | 2020-12-08 | 2022-06-10 | 军事科学院***工程研究院网络信息研究所 | Wavelength division multiplexing channel switching method of vernier-like caliper |
| CN114914647A (en) * | 2022-05-17 | 2022-08-16 | 电子科技大学 | Tunable broadband band-stop filter based on ferrite material |
| CN115425378A (en) * | 2022-08-26 | 2022-12-02 | 电子科技大学 | Cross-coupling cavity substrate integrated waveguide band-pass filter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103077271A (en) * | 2012-09-12 | 2013-05-01 | 电子科技大学 | 8 mm substrate integrated waveguide circulator parameter determination method |
| CN103560310A (en) * | 2013-10-25 | 2014-02-05 | 南京美华极地信息技术有限公司 | Miniaturization substrate integration waveguide match load |
| CN104934662A (en) * | 2015-06-05 | 2015-09-23 | 电子科技大学 | Substrate integrated waveguide ferrite tunable band-pass filter |
| CN105932387A (en) * | 2016-05-17 | 2016-09-07 | 电子科技大学 | Double-junction circulator based on SIW |
-
2018
- 2018-09-28 CN CN201811139843.4A patent/CN109346807A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103077271A (en) * | 2012-09-12 | 2013-05-01 | 电子科技大学 | 8 mm substrate integrated waveguide circulator parameter determination method |
| CN103560310A (en) * | 2013-10-25 | 2014-02-05 | 南京美华极地信息技术有限公司 | Miniaturization substrate integration waveguide match load |
| CN104934662A (en) * | 2015-06-05 | 2015-09-23 | 电子科技大学 | Substrate integrated waveguide ferrite tunable band-pass filter |
| CN105932387A (en) * | 2016-05-17 | 2016-09-07 | 电子科技大学 | Double-junction circulator based on SIW |
Non-Patent Citations (1)
| Title |
|---|
| QIAO-LI ZHANG等: "A Magnetically Tunable Dual-mode Bandpass Filter for Cognitive Wireless System", 《2018 INTERNATIONAL APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY SYMPOSIUM - CHINA (ACES)》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114614938A (en) * | 2020-12-08 | 2022-06-10 | 军事科学院***工程研究院网络信息研究所 | Wavelength division multiplexing channel switching method of vernier-like caliper |
| CN114614938B (en) * | 2020-12-08 | 2024-04-23 | 军事科学院***工程研究院网络信息研究所 | Wavelength division multiplexing channel switching method of vernier caliper |
| CN113839158A (en) * | 2021-09-26 | 2021-12-24 | 华南理工大学 | Four-mode dielectric waveguide filter |
| CN113839158B (en) * | 2021-09-26 | 2022-04-22 | 华南理工大学 | Four-mode dielectric waveguide filter |
| CN114914647A (en) * | 2022-05-17 | 2022-08-16 | 电子科技大学 | Tunable broadband band-stop filter based on ferrite material |
| CN114914647B (en) * | 2022-05-17 | 2023-04-28 | 电子科技大学 | Tunable broadband band-stop filter based on ferrite material |
| CN115425378A (en) * | 2022-08-26 | 2022-12-02 | 电子科技大学 | Cross-coupling cavity substrate integrated waveguide band-pass filter |
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