CN117713728A - Multi-octave filter assembly - Google Patents
Multi-octave filter assembly Download PDFInfo
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- CN117713728A CN117713728A CN202311817952.8A CN202311817952A CN117713728A CN 117713728 A CN117713728 A CN 117713728A CN 202311817952 A CN202311817952 A CN 202311817952A CN 117713728 A CN117713728 A CN 117713728A
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- 238000013461 design Methods 0.000 claims abstract description 13
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 18
- 238000000137 annealing Methods 0.000 claims description 16
- 239000000956 alloy Substances 0.000 claims description 15
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000007731 hot pressing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000035699 permeability Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 3
- 239000000306 component Substances 0.000 description 10
- 238000009826 distribution Methods 0.000 description 8
- 238000004088 simulation Methods 0.000 description 7
- 230000004907 flux Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 229910001004 magnetic alloy Inorganic materials 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000008358 core component Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000010618 wire wrap Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0138—Electrical filters or coupling circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0153—Electrical filters; Controlling thereof
- H03H7/0161—Bandpass filters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Evolutionary Computation (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Optimization (AREA)
- Mathematical Analysis (AREA)
- Computational Mathematics (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a multi-octave filter component, which relates to the fields of electronic countermeasure, microwave measurement and high-performance instruments and meters, and comprises the following components: on the conception of a multi-octave band-pass filter assembly based on a three-stage harmonic oscillator, a five-stage high-selectivity filter coupling technology is adopted, and the design of analog and digital combined compensation is carried out in an exciter, so that the multi-octave filter and a digital-analog compensation exciter are integrally designed to form a multi-octave filter assembly; the invention increases the frequency bandwidth, reduces the volume and the power consumption, and designs the traditional YIG filter with three frequency bands of (2-4) + (4-8) + (8-18) in the same magnetic circuit to realize the function of 2-18 GHz.
Description
Technical Field
The invention relates to the fields of electronic countermeasure, microwave measurement and high-performance instruments and meters, in particular to a multi-octave filter assembly.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The magnetic tuning device is mainly applied to two large fields: electronic equipment, high performance microwave measurement instruments (e.g., frequency synthesis signal sources, swept frequency synthesis signal sources, spectrum analyzers, panoramic receivers, swept generators, etc.). In radar, surveillance and monitoring, communication, electronic countermeasure, etc. systems, the pre-selection filter is a key component in the front-end system, and currently adopted filters mainly include a fixed frequency filter, a switch filter bank, a YIG filter, etc. The YIG magnetic tuning filter has become a core component in the wide fields of electronic warfare, communication, searching and the like by the excellent comprehensive performance advantage.
With the progress of electronic technology, broadband, miniaturization, low power consumption and high reliability are the general trend of electronic equipment development, and as a core component of electronic warfare, a magnetic tuning device also faces the same technical requirements, and a special device of the magnetic tuning device with broadband, miniaturization and low power consumption is the general trend of the development of the magnetic tuning device in the current and future 5-20 years. The band-pass filter of the multi-octave magnetic tuning device can not only finish the broadband frequency-selecting filtering function which can be finished by combining a plurality of filters, but also greatly reduce the volume and the weight of the whole machine, simplify the design of the whole machine, be an essential core broadband device in electronic countermeasure equipment and the like, and can be widely applied to the fields of broadband electronic countermeasure and the like. However, on the premise that the magnetic circuit and coil material technology and the filter plane resonance technology do not make practical breakthroughs, the bandwidth, the volume and the power consumption of the current single filter can only be changed in a limited range, so that the current single filter cannot meet the development requirements of a future broadband electronic warfare system.
Disclosure of Invention
The invention aims at: aiming at the problems existing in the prior art, the multi-octave filter component is provided, the frequency bandwidth is increased, the volume and the power consumption are reduced, and the functions of 2-18GHz are realized by designing the traditional YIG filter with three frequency bands of (2-4) + (4-8) + (8-18) in the same magnetic circuit, so that the problems are solved.
The technical scheme of the invention is as follows:
a multi-octave filter assembly is characterized in that a five-stage selective filtering coupling technology is adopted on the conception of a multi-octave band-pass filter assembly based on three-stage harmonic oscillators, analog and digital combination compensation is designed in an exciter, and the multi-octave filter and a digital-analog compensation exciter are integrally designed to form the multi-octave filter assembly.
Further, the method comprises the steps of: an exciter upper cavity and an exciter lower cavity; the upper cavity of the exciter is connected with an upper magnetic circuit assembly, the lower cavity of the exciter is connected with a lower magnetic circuit assembly at a position corresponding to the upper magnetic circuit assembly, a sampling resistance plate and a control circuit are arranged in the lower cavity of the exciter, and a low-frequency connector is further connected to the outer part of the lower cavity of the exciter.
Further, the upper magnetic circuit assembly includes: and the upper magnetic circuit shell is connected with the upper cavity of the exciter, and a coil, a medium cavity assembly and ferrite are arranged in the upper magnetic circuit shell.
Further, the lower magnetic circuit assembly includes: the lower magnetic circuit shell is connected with the lower cavity of the exciter, and a coil, a medium cavity assembly and ferrite are arranged in the lower magnetic circuit shell; and a radio frequency connector is connected to the outer part of the lower cavity.
Further, the control circuit includes:
the digital control drive control circuit is connected with the analog compensation circuit and the digital compensation circuit; the analog compensation circuit and the digital compensation circuit are used for controlling the medium cavity component to change so as to realize the frequency change of the filter and realize the broadband filtering of 2-18GHz in the same magnetic circuit.
Further, the device also comprises a bottom plate, and the lower cavity of the exciter is arranged on the bottom plate.
Further, the ferrite is a large-size iron-nickel alloy with high magnetic conductivity and wide temperature range.
Further, the preparation method of the large-size iron-nickel alloy comprises the following steps:
step S1: reasonable proportioning of raw materials is carried out;
step S2: carrying out a vacuum hot-pressing process;
step S3: carrying out a vacuum smelting process;
step S4: and carrying out a vacuum annealing process to obtain the large-size iron-nickel alloy.
Further, in the step S2, a vacuum induction furnace smelting and reasonable deoxidization system, inclusion modification treatment technology and casting mode are adopted to minimize nonmetallic inclusion and gas content in the alloy, and the inclusion type is controlled.
Further, in the step S3, the annealing temperature, the annealing heat-preserving time, the annealing mode and the annealing cooling speed in the heat treatment process are reasonably adjusted under the protection of atmosphere, so that the microstructure of the better alloy is obtained, and the magnetic performance of the alloy is improved.
Compared with the prior art, the invention has the beneficial effects that:
1. a multi-octave filter assembly adopts five-stage selective filtering coupling technology on the conception of a multi-octave band-pass filter assembly based on three-stage harmonic oscillators, and performs design of analog and digital combination compensation in an exciter, so that the multi-octave filter and the digital-analog compensation exciter are integrally designed to form the multi-octave filter assembly; the frequency bandwidth is increased, the volume and the power consumption are reduced, and the traditional YIG filter with three frequency bands of (2-4) + (4-8) + (8-18) is designed in the same magnetic circuit to realize the function of 2-18 GHz.
Drawings
FIG. 1 is a schematic diagram of a multi-octave filter assembly;
FIG. 2 is a schematic block diagram of a multi-octave filter assembly;
FIG. 3 is a flow chart of a multi-parameter preparation process of a large-size iron-nickel alloy;
FIG. 4 is a diagram of the simulation design results of a magnetic circuit;
fig. 5 is a graph of simulation results of the magnetic field homogeneity region.
Reference numerals: the device comprises a 1-exciter upper cavity, a 2-exciter lower cavity, a 3-sampling resistor plate, a 4-control circuit, a 5-low frequency connector, a 6-upper magnetic circuit shell, a 7-lower magnetic circuit shell, an 8-coil, a 9-medium cavity assembly, a 10-radio frequency connector and an 11-bottom plate.
Detailed Description
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The features and capabilities of the present invention are described in further detail below in connection with examples.
Example 1
The present embodiment proposes a multi-octave filter assembly with the following capabilities:
the working frequency bandwidth of the filter component is improved under the limited volume size;
the preparation of the iron-nickel alloy material with excellent magnetic performance is realized by a complete process mode;
and the high-temperature stability of the multi-octave filter component is improved under a complex application environment.
In this embodiment, in particular, in the multi-octave filter component, on the concept of the multi-octave band-pass filter component based on the three-stage harmonic oscillator, a five-stage selective filter coupling technology is adopted, and the design of analog and digital combined compensation is performed in the exciter, so that the system volume is reduced, and the multi-octave filter and the digital-analog compensation exciter are integrally designed, so as to form the multi-octave filter component.
In this embodiment, specifically, the method includes: an upper exciter cavity 1 and a lower exciter cavity 2; the upper cavity 1 of the exciter is connected with an upper magnetic circuit assembly, the lower cavity 2 of the exciter is connected with a lower magnetic circuit assembly at a position corresponding to the upper magnetic circuit assembly, a sampling resistor plate 3 and a control circuit 4 are arranged in the lower cavity 2 of the exciter, and a low-frequency connector 5 is further connected to the outer part of the lower cavity 2 of the exciter.
In this embodiment, specifically, the upper magnetic circuit assembly includes: an upper magnetic circuit shell 6 connected with the upper cavity 1 of the exciter, wherein a coil 8, a medium cavity assembly 9 and ferrite are arranged in the upper magnetic circuit shell 6.
In this embodiment, specifically, the lower magnetic circuit assembly includes: a lower magnetic circuit shell 7 connected with the lower cavity 2 of the exciter, wherein a coil 8, a medium cavity assembly 9 and ferrite are arranged in the lower magnetic circuit shell 7; the lower chamber is externally connected with a radio frequency connector 10.
In this embodiment, specifically, the control circuit 4 includes:
the numerical control drive control circuit 4, and an analog compensation circuit and a digital compensation circuit connected with the numerical control drive control circuit 4; the analog compensation circuit and the digital compensation circuit are used for controlling the medium cavity assembly 9 to change so as to realize the frequency change of the filter and realize the broadband filtering of 2-18GHz in the same magnetic circuit;
in this embodiment, specifically, the actuator lower cavity 2 further includes a bottom plate 11, and the actuator lower cavity 2 is mounted on the bottom plate 11.
In this embodiment, specifically, the iron oxide is a large-size iron-nickel alloy with high magnetic permeability and wide temperature range.
Namely, in the embodiment, in order to realize high selectivity of the filter, a coupling design of five-stage harmonic oscillators is realized inside a microwave medium cavity;
in order to realize more accurate frequency control, an analog compensation circuit is added inside the exciter to realize accurate combination of analog compensation and digital compensation circuits, and a structural model and a principle frame to be adopted are shown in fig. 1 and 2.
Based on the iron-nickel alloy with excellent magnetic performance, the multi-octave filter component with the frequency of 2G-20 GHz is completed through comprehensive analysis of the principle, physical composition and structural model of the magnetic tuning device.
In this embodiment, specifically, in order to develop a microwave tuner with high temperature stability, the invention analyzes the change rule of macroscopic crystal structures of the iron-nickel soft magnetic alloy materials at home and abroad from a multi-scale angle, obtains the influence rule of different components and doping on soft magnetic performance, prepares the iron-nickel soft magnetic alloy material with high magnetic conductivity and wide temperature through hot-press sintering and vacuum melting, optimizes hot-press sintering and vacuum melting parameters, adjusts the microstructure of the iron-nickel alloy through vacuum annealing to realize wide temperature stability of the iron-nickel alloy, and further completes the function of the magnetic alloy material in a magnetic tuning device.
In this embodiment, as shown in fig. 3, the preparation method of the large-size iron-nickel alloy is as follows:
step S1: reasonable proportioning of raw materials is carried out;
step S2: carrying out a vacuum hot-pressing process;
step S3: carrying out a vacuum smelting process;
step S4: and carrying out a vacuum annealing process to obtain the large-size iron-nickel alloy.
In this embodiment, the magnetic properties of the iron-nickel soft magnetic alloy are determined by the chemical composition of the alloy, the smelting process, and the heat treatment process. In order to obtain higher alloy magnetic performance in production, the following matters are adopted one by one: (1) reasonable proportioning of raw materials is carried out, and raw materials with higher purity are selected; (2) adopting a vacuum induction furnace smelting and reasonable deoxidization system, inclusion modification treatment technology and casting mode to reduce nonmetallic inclusion and gas content in the alloy as much as possible and control inclusion types; (3) under the protection of atmosphere, the annealing temperature, the annealing heat preservation time, the annealing mode and the annealing cooling speed in the heat treatment process are reasonably adjusted, so that the tissue structure of the better alloy is obtained, and the magnetic performance of the alloy is improved.
In this embodiment, a magnetic focusing taper design is also performed, specifically as follows:
within the air gap, B 0 ＝μ 0 H 0 Based on the principle of magnetic flux continuity, the magnetic induction intensity B inside the magnetic circuit m The value may be calculated by the following formula:
B 0 ＝B m ·S m /S 0
wherein: s is S 0 The magnetic pole area after correction is that each side of the magnetic pole is added with 2l 0 In mm 2 . In the formula, if the saturation condition and the magnetic flux leakage condition of the top end of the pole head are not considered, the pole head is formed by S m /S 0 The desired high B can be obtained by designing the ratio of the (magnetic focusing taper) 0 But the magnetic flux at the minimum area of the top of the pole head will be S of the body pole m /S 0 Multiple times, the required magnetic field can be achieved.
The structure of the designed multi-octave self-shielding compact magnetic circuit is simulated by a finite element method through a large electromagnetic field analysis simulation software package (Maxwell 3D), and the distribution of the magnetic circuit and the air gap magnetic field is analyzed and calculated, as shown in fig. 4 and 5. The magnetization state and the magnetic flux density state of each area (comprising the air gap magnetic field) of the composite magnetic circuit are analyzed through simulation.
The simulation design key point of the magnetic field uniform region is to determine the gradient distribution condition of the strong magnetic field of the working region when working in a KU wave band and determine the uniform region area and the corresponding pole head size meeting the requirement of a resonant circuit. In the structural parameter design, the magnetic focusing taper, the air gap area, the pole area and other parts affecting the linearity and the magnetic field intensity are optimized. And analyzing the magnetic field distribution and magnetic leakage of the magnetic circuit and various factors influencing the uniformity, consistency and linearity of the working magnetic field of the air gap by utilizing the accurate magnetic field distribution conditions of all areas obtained under different magnetic circuit structure conditions. The key points affecting the magnetic field distribution and the easy saturation areas are analyzed, the sizes of the magnetic circuit structure and the magnetic pole head are adjusted, and the magnetization characteristics of the magnetic flux density distribution and the easy saturation areas are improved, so that the optimal simulation of the magnetic circuit structure is achieved.
According to the simulation analysis on the air gap working magnetic field distribution of the multi-octave magnetic circuit system, the influence of a magnetic circuit structure, magnetic circuit wire wrapping, working air gaps, the inclination angle of a magnetic pole head and the like on the magnetic field is obtained, the special transient simulation dynamic analysis on the internal heat distribution of the magnetic circuit is carried out, the linearity and uniformity of the magnetic circuit under the dynamic tuning condition are ensured, and the design size parameters are formed, so that the material matching and performance design of key devices are completed.
The foregoing examples merely represent specific embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present application, which fall within the protection scope of the present application.
This background section is provided to generally present the context of the present invention and the work of the presently named inventors, to the extent it is described in this background section, as well as the description of the present section as not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present invention.
Claims (10)
1. The multi-octave filter assembly is characterized in that a five-stage selective filtering coupling technology is adopted on the conception of a multi-octave band-pass filter assembly based on a three-stage harmonic oscillator, and the design of analog and digital combined compensation is carried out in an exciter, so that the multi-octave filter and the digital-analog compensation exciter are integrally designed, and the multi-octave filter assembly is formed.
2. A multi-octave filter assembly according to claim 1, comprising: an upper exciter cavity (1) and a lower exciter cavity (2); the high-frequency electromagnetic actuator is characterized in that an upper magnetic circuit assembly is connected to the upper cavity (1) of the actuator, a lower magnetic circuit assembly is connected to the lower cavity (2) of the actuator at a position corresponding to the upper magnetic circuit assembly, a sampling resistor plate (3) and a control circuit (4) are arranged in the lower cavity (2) of the actuator, and a low-frequency connector (5) is further connected to the outer portion of the lower cavity (2) of the actuator.
3. The multi-octave filter assembly of claim 2, wherein the upper magnetic circuit assembly comprises: an upper magnetic circuit shell (6) connected with the upper cavity (1) of the exciter, wherein a coil (8), a medium cavity assembly (9) and ferrite are arranged in the upper magnetic circuit shell (6).
4. A multi-octave filter assembly according to claim 3, wherein the lower magnetic circuit assembly comprises: the lower magnetic circuit shell (7) is connected with the lower cavity (2) of the exciter, and a coil (8), a medium cavity assembly (9) and ferrite are arranged in the lower magnetic circuit shell (7); and a radio frequency connector (10) is connected to the outside of the lower cavity (2) of the exciter.
5. A multi-octave filter assembly according to claim 4, wherein the control circuit (4) comprises:
the digital control driving control circuit (4) is connected with the analog compensation circuit and the digital compensation circuit which are connected with the digital control driving control circuit (4); the analog compensation circuit and the digital compensation circuit are used for controlling the medium cavity assembly (9) to change so as to realize the frequency change of the filter and realize the broadband filtering of 2-18GHz in the same magnetic circuit.
6. A multi-octave filter assembly according to claim 2, further comprising a base plate (11), the exciter lower cavity (2) being mounted on the base plate (11).
7. The multiple octave filter assembly of claim 4, wherein the ferrite is a large size iron-nickel alloy having high permeability and wide temperature range.
8. The multi-octave filter assembly of claim 7, wherein the method of making the large-size iron-nickel alloy comprises:
step S1: reasonable proportioning of raw materials is carried out;
step S2: carrying out a vacuum hot-pressing process;
step S3: carrying out a vacuum smelting process;
step S4: and carrying out a vacuum annealing process to obtain the large-size iron-nickel alloy.
9. The multi-octave filter assembly according to claim 8, wherein in step S2, a vacuum induction furnace smelting and reasonable deoxidization system, inclusion modification treatment technology and casting mode are adopted to minimize nonmetallic inclusion and gas content in the alloy and control inclusion types.
10. The multi-octave filter assembly according to claim 8, wherein in step S3, the annealing temperature, the annealing holding time, the annealing mode and the annealing cooling speed in the heat treatment process are reasonably adjusted under the protection of atmosphere, so as to obtain the tissue structure of the better alloy and improve the magnetic performance of the alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311817952.8A CN117713728A (en) | 2023-12-27 | 2023-12-27 | Multi-octave filter assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311817952.8A CN117713728A (en) | 2023-12-27 | 2023-12-27 | Multi-octave filter assembly |
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| CN117713728A true CN117713728A (en) | 2024-03-15 |
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| CN202311817952.8A Pending CN117713728A (en) | 2023-12-27 | 2023-12-27 | Multi-octave filter assembly |
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- 2023-12-27 CN CN202311817952.8A patent/CN117713728A/en active Pending
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