CN2081153U - Dielectric filter - Google Patents
Dielectric filter Download PDFInfo
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- CN2081153U CN2081153U CN 90206445 CN90206445U CN2081153U CN 2081153 U CN2081153 U CN 2081153U CN 90206445 CN90206445 CN 90206445 CN 90206445 U CN90206445 U CN 90206445U CN 2081153 U CN2081153 U CN 2081153U
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- dielectric filter
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Abstract
The utility model relates to a medium wave filter, which can be used for any frequency required by communication equipment in the wave band of decimeter wave. The utility model is composed of a ceramic block with high-density microwave medium, a surface electrode of the ceramic block, at least two medium resonant chambers on the ceramic block, a slot for achieving the coupling of the resonant chambers, an input and output device and a metal casing. The utility model has the advantages of simple structure, small size, simple fabrication, good consistency, high reliability, low insertion loss, high frequency stability, etc. The utility model is widely suitable for military industry, the microwave mobile communication for civil use, controlled systems of aircraft radars, airport radio stations and car telephones.
Description
The utility model relates to a kind of dielectric filter that can be used for the required arbitrary frequency of decimeter wave band communication equipment.
Development dielectric filter modulator material is crucial.We select for use homemade industrial chemicals to B
aO-TiO
2-rare earth system has carried out formula test hundreds of times, has obtained to have high-k, low-loss, microwave-medium porcelain that frequency-temperature coefficient is little.The device aspect, the eighties Japan Murata Manufacturing Co. Ltd., Panasonic's electrical strain formula can just be sold dielectric filter to the whole world, and its technology is comparatively ripe.1988, Murata Manufacturing Co. Ltd. began to produce the mobile phone filter in the ERIE village field factory of subsidiary of the U.S., adopts the medium block pectinate texture more, utilized air gap coupling one-shot forming, had solved the even problem of density preferably.But the required Mould Machining difficulty of present domestic pectinate texture medium porcelain piece one-shot forming can't adapt to batch process.The dielectric filter of Electric Co., Ltd of Panasonic adopts the coaxial type structure more, utilizes the thick-film capacitor coupling, has solved the frequency modulation problem well.But complex structure, manufacture difficulty is big.The development of domestic centimeter wave wave band dielectric filter also obtains certain progress, but most cavity type structure that adopts, volume is bigger, is unsuitable for mobile communication.
The purpose of this utility model is to provide a kind of dielectric filter that can be used for the required arbitrary frequency of decimeter wave band communication equipment.Its method by slotting on the position that electric field and magnetic field in 1/4 wave resonator are equated, the balance of destruction electromagnetic field realizes the coupling of resonant cavity, thereby makes device architecture more simply stable and reliable for performance.
It is a kind of general in the improved dielectric filter that is made of high-compactness, low-loss microwave dielectric porcelain piece that another purpose of the present utility model is to provide, thereby make device volume dwindle high conformity greatly, is convenient to produce in batches.
Purpose of design of the present utility model can realize by following array structure: it is included on porcelain piece 2 in the metal shell 1 and the porcelain piece 2 at least two dielectric resonant chambers 3, coupling device 4, input/output device 5, and its substantive characteristics is: in the both sides 6 of described porcelain piece 2 outer surface electrodes 6
aGroove 4 perpendicular to resonant cavity 3 is respectively arranged.
Purpose of design of the present utility model can also realize by following structure: described groove 4 is in the both sides 6 of porcelain piece 2 outer surface electrodes 6
aElectric field and magnetic field equate place 4.
Purpose of design of the present utility model can also realize by following measure: the degree of depth (h) that the method that adopts fluting to be coupled obtains groove 4 is directly proportional with coupling coefficient (k).
Purpose of design of the present utility model also can realize by following measure: the porcelain piece 2 in the metal shell 1 is made by high-k, low-loss, material that frequency-temperature coefficient is little, i.e. ε
r=88, Q(3G) 〉=1800, τ
f=0 ± 1PPm/ ℃.
Purpose of design of the present utility model also can realize by following measure: adopt abrasive method to change the height of porcelain piece 2, be used to adjust resonance frequency.
With two cavate dielectric filters is example, drawing explanation in conjunction with the accompanying drawings, and above-mentioned purpose of the present utility model, characteristics and advantage will be more apparent.
Fig. 1-a, Fig. 1-b are respectively the medium block forward cutaway view and the vertical view of known technology pectinate texture;
Fig. 2-a, Fig. 2-b are respectively medium block and the thick film coupling device forward cutaway view and the vertical view of known technology coaxial configuration;
Fig. 3 is a known technology cavity type structured media filter vertical view, for clarity sake omits the strutting piece of metal box-lid, sensing device, frequency modulation device and medium block.
Fig. 4-a is the utility model stereogram, for clarity sake omits metal shell;
Fig. 4-b is the utility model front view;
Fig. 4-c is the utility model medium block side sectional view;
Fig. 5 is the utility model electric field and the magnetic field distribution curve in 1/4 wave resonator;
Fig. 6 is an equivalent electric circuit of the present utility model.
Though the utility model can and require that some kinds actual embodiments be arranged according to the environment that uses, and the basic example of good several embodiments of represented in this article and explanation is to have made and try out gratifying after testing.
For understanding the utility model better, existing combination (accompanying drawing) embodiment is described in further detail.
Fig. 1-a, Fig. 1-b are respectively known technology pectinate texture medium block forward cutaway view and vertical view.Utilize air gap 2 to realize the coupling of resonant cavity 3 on the porcelain piece 1.Because at present China's Mould Machining level falls behind, utilize one-shot forming technique to make very difficulty and be unsuitable for producing in batches of air gap very little on the medium block 2.
Fig. 2-a, Fig. 2-b are respectively known technology coaxial configuration medium block and thick film coupling device forward cutaway view and vertical view.Use the method for welding to be assembled on the ceramic substrate 2 resonant cavity at least two medium blocks 13, utilize thick-film capacitor 2
aThe coupling of realization resonance.The weak point of this known technology is that the complex structure assembly difficulty is big.
Fig. 3 is a known technology cavity type dielectric filter vertical view, omits the strutting piece of metal box-lid, sensing device, frequency modulation device and medium block.In can 3, insert at least two column type medium blocks 1, utilize air gap 2 to realize the resonance coupling.The weak point of this known technology is loaded down with trivial details and volume is big because of the assembling of the reason of configuration aspects, is not suitable for mobile communication.
Fig. 4-a, Fig. 4-b, Fig. 4-c are respectively the utility model structural representation.At first should consider assembly method when making dielectric filter: input/output device 5 tightly is inserted in the plastic wick 7, plastic wick 7 is inserted dielectric resonant chamber 3 and is fitted like a glove with around it, two head part of plastic wick 7 are exposed to the two ends up and down of dielectric resonant chamber 3, the dielectric filter core body that assembles is inserted in the metal shell 1, and be close to fixingly with it, but the lead-in wire of I/O end 5 must not contact with metal shell; Except that the upper surface, porcelain piece 2(comprises groove 4) be metallic electrode 6 all, and select for use the dielectric resonant chamber of 1/4 wavelength to utilize the coefficient of linear expansion matching principle in the chamber, to adopt the material of uniform temp coefficient to make metallization chamber 6
b, to improve the certainty of measurement of resonator.
Fig. 5 is the utility model electric field and the magnetic field distribution curve in 1/4 wave resonator.A dot mark electric field and magnetic field equate.H is that magnetic field intensity, E are that electric field strength, h are height.Dielectric filter adopts ceramic process to be made, we adopt the method for twice pressurization, successfully obtained the porcelain piece of high-compactness, and on the basis of analyzing external dielectric filter coupled modes, according to China's national situation, created a kind of new coupled modes: at the equal a point of electric field and magnetic field is medium porcelain piece both sides 6
aPlace fluting 4 reaches coupling thereby destroy the electromagnetic field balance, and the degree of depth that draws groove 4 is directly proportional with coupling coefficient.Adopt this new coupled modes not only to obtain the filter of excellent performance, also suppressed effectively filter high order harmonic component and simple in structure, volume is little, in light weight.
With the LJT904M dielectric filter is example:
| Model | Centre frequency (MHz) | Pass band width (3db) | Insert loss (dB) | Volume (mm) | Weight (g) |
| LJT904M | 904±1 | ≤26 | ≤2.2 | 14×12×7 | 4 |
Fig. 6 is the equivalent electric circuit of utility model.L
1C
1And L
2C
2Equivalence is the oscillation circuit of two parallel connections respectively; C
4, C
5Equivalence is I/O electric capacity respectively; C
3Equivalence is a coupling capacitance.Shown in and described advantage of the present utility model can conclude and be listed below:
1. because input/output device 5 and plastic wick 7 are identical with inserted mode and dielectric resonant chamber 3, basic also the needs guarantees that the installation step of precision can be integrated, thereby make simple to operate, cost reduction, improved the precision of resonance frequency simultaneously, strengthened reliability.
2. owing to use high-compactness, low-loss, homemade novel microwave dielectric material that frequency-temperature coefficient is little, dwindle the volume of filter, in light weight, good reliability greatly, be applicable to microwave mobile communication.
3. owing to use the method for fluting coupling, simplified technology, suppressed the high order harmonic component of filter effectively, made the filter high conformity, be more conducive to produce in enormous quantities.
Because we have manufactured experimently out homemade novel microwave dielectric material, and by creativeness development to the device architecture aspect, the every index that makes decimeter wave wave band 400MHz～3GHz band pass filter and field, Japanese village are compared not a halfpenny the worse with the Panasonic product, use on the machine substituting import one fully.
For the person skilled in the art of this area, after having understanded technology disclosed herein, may carry out various changes, but not leave scope of the present utility model.
Claims (5)
1, a kind of dielectric filter, it is included on porcelain piece 2 in the metal shell 1 and the porcelain piece 2 at least two dielectric resonant chambers 3, coupling device 4, input/output device 5, of the present utility model being characterised in that:, locate respectively to have a groove 4 perpendicular to resonant cavity 3 in the both sides 6 of described porcelain piece 2 outer surface electrodes 6.
2, dielectric filter according to claim 1 is characterized in that: described groove 4 is in the both sides 6 of porcelain piece 2 outer surface electrodes 6
aElectric field and magnetic field equate place 4.
3, according to claim 1 and 2 described dielectric filters, it is characterized in that: adopt the method for fluting coupling to draw the degree of depth of groove 4 and the relation of coupling coefficient:
H ∞ k (h is that the degree of depth, the k of groove is coupling coefficient)
4, dielectric filter according to claim 1 and 2 is characterized in that: the porcelain piece 2 in the metal shell 1 is made by high-k, low-loss, microwave dielectric material that frequency-temperature coefficient is little.
5, dielectric filter according to claim 1 and 2 is characterized in that: adopt abrasive method to change the height of porcelain piece 2, be used to adjust resonance frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90206445 CN2081153U (en) | 1990-05-13 | 1990-05-13 | Dielectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90206445 CN2081153U (en) | 1990-05-13 | 1990-05-13 | Dielectric filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2081153U true CN2081153U (en) | 1991-07-17 |
Family
ID=4887036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90206445 Withdrawn CN2081153U (en) | 1990-05-13 | 1990-05-13 | Dielectric filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2081153U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053998C (en) * | 1995-05-31 | 2000-06-28 | 株式会社村田制作所 | Dielectric filter and antenna duplexer |
| CN106025457A (en) * | 2016-06-21 | 2016-10-12 | 江苏江佳电子股份有限公司 | Novel dielectric ceramic frequency device and molding method of resonant cavity hole with controllable size |
-
1990
- 1990-05-13 CN CN 90206445 patent/CN2081153U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053998C (en) * | 1995-05-31 | 2000-06-28 | 株式会社村田制作所 | Dielectric filter and antenna duplexer |
| CN106025457A (en) * | 2016-06-21 | 2016-10-12 | 江苏江佳电子股份有限公司 | Novel dielectric ceramic frequency device and molding method of resonant cavity hole with controllable size |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |