CN109786909A - A kind of ceramic waveguide filter - Google Patents
A kind of ceramic waveguide filter Download PDFInfo
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- CN109786909A CN109786909A CN201910198735.2A CN201910198735A CN109786909A CN 109786909 A CN109786909 A CN 109786909A CN 201910198735 A CN201910198735 A CN 201910198735A CN 109786909 A CN109786909 A CN 109786909A
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Abstract
The present invention relates to a kind of ceramic waveguide filters, offer coupling aperture on the ceramic filter of existing spacing frequency chamber, the side that coupling aperture is located at ceramic filter opens up, and is also located between two frequency chambers and is arranged, and the bandwidth of filter is made to broaden.The present invention is exactly to solve after ceramic waveguide filter size becomes smaller, and enhances the coupling bandwidth between frequency and frequency, so that product frequency range is wider.
Description
Technical field
The invention belongs to the technical field of ceramic filter more particularly to a kind of ceramic waveguide filters.
Background technique
With the continuous development of modern communication technology, the requirement to filter is higher and higher, small size, high-performance, Gao Gong
Rate, inexpensive wave filter technology are particularly important the filter in wireless communications application, the Array Antenna of 5G
Under application conditions, the size of existing metal cavity filter has been unable to satisfy the requirement of wireless communication system completely；As usual
20 watts of filters of single channel of rule, current size is at 200X100X30 millimeters or more, but the size of 5G filter requires
50X30X30 millimeters of size is hereinafter, otherwise array antenna scheme cannot achieve.
According to resonant cavity principle, the intracorporal resonance frequency of chamber, depending on the size of cavity and Jie of filling materials for wall body
Electric constant；Same packing material, the more big then resonance frequency of size are lower；Under the conditions of same size, resonance frequency and dielectric are normal
Several square roots are inversely proportional, i.e., under same cavity size, the resonance frequency of the more big then cavity of filler dielectric constant is lower, empty
Chamber resonant cavity, using air as medium, dielectric constant 1, and the available dielectric constant range of ceramic material is between 4-120, with
For 36 dielectric constants, the cavity size under same frequency condition can be reduced to 1/6th of metal cavitg, it is seen that application is situated between
Significant ability of the electric material for reduction cavity size.
With the development of modern communication technology, the miniaturization of communication equipment is a kind of inevitable trend, especially in 5G
In generation, aobvious particularly important of the miniaturization of communication equipment, in 5G communication, filter is also always towards miniaturization, still
Filter size with communication bandwidth required for reality is contradictory, after size reduction, between frequency and frequency coupling after reducing
Crossed belt is wide not enough, causes product passband that can not broaden.
In view of the above shortcomings, the designer, is actively subject to research and innovation, to found a kind of new structural ceramics
Waveguide filter makes it with more the utility value in industry.
Summary of the invention
In order to solve the above technical problems, the object of the present invention is to provide a kind of ceramic waveguide filters.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of ceramic waveguide filter, it is characterised in that: offer coupling on the ceramic filter of existing spacing frequency chamber
Close hole slot, coupling aperture slot position is opened up in the side of ceramic filter, and is also located between two frequency chambers and is arranged, make two frequency chambers it
Between coupling enhancing, wherein coupling hole slot and frequency chamber between formula it is as follows:
P is magnetic polarization coefficient；
M is the coefficient of coup；
L and D is the length and diameter for coupling hole slot respectively；
Z is the half for coupling hole length, i.e. z=L/2；
λ is constant.
Preferably, the coupling hole slot is cylindrical body, or is cuboid.
Preferably, the coupling hole slot can slightly smaller offset to the left and right between the frequency chamber at interval.
According to the above aspect of the present invention, the present invention has at least the following advantages:
The present invention is exactly to solve after ceramic waveguide filter size becomes smaller, and enhances the coupling bandwidth between frequency and frequency,
So that product frequency range is wider, and coupling bandwidth can be promoted 30%.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is structural schematic diagram of the invention.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction with attached in the embodiment of the present invention
Figure, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.Embodiments of the present invention, which are generally described and illustrated herein in the accompanying drawings
Component can arrange and design with a variety of different configurations.Therefore, the implementation of the invention to providing in the accompanying drawings below
The detailed description of example is not intended to limit the range of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiment of the present invention, those skilled in the art are obtained all without making creative work
Other embodiments shall fall within the protection scope of the present invention.
Embodiment
As shown in Figure 1, a kind of ceramic waveguide filter, offers coupling on the ceramic filter 1 of existing spacing frequency chamber 2
3 slot of hole is closed, the side that coupling hole slot 3 is located at ceramic filter opens up, and is also located between two frequency chambers 2 and is arranged, and makes two frequencies
Coupling enhancing between chamber, wherein the formula between coupling hole slot 3 and frequency chamber is as follows:
P is magnetic polarization coefficient；
M is the coefficient of coup；
L and D is the length and diameter of coupling aperture respectively；
Z is the half for coupling hole length, i.e. z=L/2；
λ is constant.
Heretofore described coupling hole slot is cylindrical body, or is cuboid, is generally operated with cylindrical body, facilitates molding
While can also convenient for coupling.
Heretofore described coupling hole slot between the frequency chamber at interval can slightly smaller offset to the left and right, slightly small-scale offset
Refer to the left and right displacement of frequency chamber central axes.
A kind of preparation process of ceramic waveguide filter, comprising the following steps:
Step 1: ceramic powder is granulated；
Step 2: the ceramics of granulating and forming being placed and pass through pressure compression moulding in a mold；
Step 3: frequency chamber is opened up on molding ceramics, and opens up coupling aperture wherein between two frequency chambers, coupling
The formula closed between the size and frequency chamber of slot is as follows:
Wherein, P is magnetic polarization coefficient；
M is the coefficient of coup；
L and D is the length and diameter of coupling aperture respectively；
Z is the half for coupling slot length, i.e. z=L/2；
λ is constant；
Step 4: by ceramic green after molding with 4 heating rates per minute, at a temperature of 1500, by 8-40 hours
Heat preservation sintering, waiting be cooled to ceramic block；
Step 5: the ceramic block after sinter molding is handled by grinding and polishing；
Step 6: preparing corresponding silk-screen template according to the ceramic block size in step 5；
Step 7:, will be on the surface of silver layer silk-screen to ceramic block by the screen printing method of silk-screen template；
Step 8: 100min sintering being carried out to the ceramic block after silk-screen silver layer by 800 temperature, obtains coupled and enhances
Filter.
The present invention is exactly to solve after ceramic waveguide filter size becomes smaller, and enhances the coupling bandwidth between frequency and frequency,
So that product frequency range is wider, and coupling bandwidth can be promoted 30%.The above is only a preferred embodiment of the present invention, not
For limiting the present invention, it is noted that for those skilled in the art, do not departing from the technology of the present invention original
Under the premise of reason, several improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of ceramic waveguide filter, it is characterised in that: offer coupling on the ceramic filter of existing spacing frequency chamber
Hole slot, coupling aperture slot position are opened up in the side of ceramic filter, and are also located between two frequency chambers and are arranged, and are made between two frequency chambers
Coupling enhancing, wherein coupling hole slot and frequency chamber between formula it is as follows:
P is magnetic polarization coefficient；
M is the coefficient of coup；
L and D is the length and diameter for coupling hole slot respectively；
Z is the half for coupling hole length, i.e. z=L/2；
λ is constant.
2. a kind of ceramic waveguide filter according to claim 1, it is characterised in that: the coupling hole slot is cylindrical body,
It or is cuboid.
3. a kind of ceramic waveguide filter according to claim 1, it is characterised in that: frequency of the coupling hole slot at interval
It can slightly smaller offset to the left and right between rate chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910198735.2A CN109786909A (en) | 2019-03-15 | 2019-03-15 | A kind of ceramic waveguide filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910198735.2A CN109786909A (en) | 2019-03-15 | 2019-03-15 | A kind of ceramic waveguide filter |
Publications (1)
| Publication Number | Publication Date |
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| CN109786909A true CN109786909A (en) | 2019-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910198735.2A Pending CN109786909A (en) | 2019-03-15 | 2019-03-15 | A kind of ceramic waveguide filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029781A (en) * | 2019-12-02 | 2020-04-17 | 成都雷电微力科技有限公司 | Compact dielectric filling waveguide circularly polarized filter antenna |
| CN111463529A (en) * | 2020-01-19 | 2020-07-28 | 武汉凡谷陶瓷材料有限公司 | Capacitive coupling device and filter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1192593A (en) * | 1996-11-08 | 1998-09-09 | Kmw株式会社 | Dual-resonator microwave filter |
| CN2901597Y (en) * | 2005-07-21 | 2007-05-16 | 浙江正原电气股份有限公司 | Ceramic medium filter |
| CN106025468A (en) * | 2016-07-11 | 2016-10-12 | 苏州艾福电子通讯股份有限公司 | Ceramic cavity filter |
-
2019
- 2019-03-15 CN CN201910198735.2A patent/CN109786909A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1192593A (en) * | 1996-11-08 | 1998-09-09 | Kmw株式会社 | Dual-resonator microwave filter |
| CN2901597Y (en) * | 2005-07-21 | 2007-05-16 | 浙江正原电气股份有限公司 | Ceramic medium filter |
| CN106025468A (en) * | 2016-07-11 | 2016-10-12 | 苏州艾福电子通讯股份有限公司 | Ceramic cavity filter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029781A (en) * | 2019-12-02 | 2020-04-17 | 成都雷电微力科技有限公司 | Compact dielectric filling waveguide circularly polarized filter antenna |
| CN111029781B (en) * | 2019-12-02 | 2022-03-29 | 成都雷电微力科技股份有限公司 | Compact dielectric filling waveguide circularly polarized filter antenna |
| CN111463529A (en) * | 2020-01-19 | 2020-07-28 | 武汉凡谷陶瓷材料有限公司 | Capacitive coupling device and filter |
| CN111463529B (en) * | 2020-01-19 | 2022-03-18 | 武汉凡谷陶瓷材料有限公司 | Capacitive coupling device and filter |
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Application publication date: 20190521 |