CN102969549B - Novel medium cavity filter with cavity - Google Patents
Novel medium cavity filter with cavity Download PDFInfo
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- CN102969549B CN102969549B CN201210492253.6A CN201210492253A CN102969549B CN 102969549 B CN102969549 B CN 102969549B CN 201210492253 A CN201210492253 A CN 201210492253A CN 102969549 B CN102969549 B CN 102969549B
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Abstract
The invention discloses a novel medium cavity filter with a cavity. The novel medium cavity filter comprises the cavity and medium resonators, wherein each medium resonator is a cylinder with a through hole and is prepared from the following components according to mass percent: 29%-32% of calcium carbonate with purity of 97.5%, 9%-11% of aluminum oxide with purity of 97.5%, 21%-25% of neodymium oxide with purity of 99.5%, and 35%-38% of titanium dioxide with purity of 99.6%; a silver layer is coated at one end of each medium resonator, and the other end of the medium resonator is welded inside the cavity; the cavity is prepared from the following components according to mass percent: 95%-96% of aluminum oxide, 2%-3% of calcium carbonate, 0.8%-1.5% of lanthanum oxide, and 0.2%-0.5% of samarium oxide; and the dielectric constant of the cavity is 9.5. The medium cavity filter disclosed by the invention is high in Q value, small in size and adjustable in temperature coefficient, and can ensure high reliability of a product structure and good consistency of thermal expansion coefficients of the cavity and the medium resonators.
Description
Technical field
The present invention relates to a kind of novel cavity dielectric cavity fluid filter, belong to reciprocity microwave device field.
Background technology
Dielectric filter is widely used in the communications field as a kind of frequency selection device, especially field of radio frequency communication.In the base station transmitting and receiving at communication system settling signal, filter is used to select signal of communication, the clutter outside filtering communication signal frequency or interference signal.
At present, in mobile communication base station system, generally with cavity body filter, the signal of antenna transmission and reception is carried out to frequency selection.Traditional cavity body filter or dielectric cavity fluid filter, all to use the aluminiums such as AL6061 to be used as the material of cavity, when this realizes dielectric cavity fluid filter, while existing the resonator welding of making as metalwork and dielectric material due to aluminium, exist more serious integrity problem.Therefore, how to design that a kind of high Q value dielectric filter has high Q value, small size, temperature coefficient is adjustable, product structure reliability is high, and the dielectric filter of cavity and dielectric resonator thermal coefficient of expansion high conformity; Become the direction that those of ordinary skills make great efforts.
Summary of the invention
The object of the invention is to provide a kind of novel cavity dielectric cavity fluid filter, and this dielectric cavity fluid filter has high Q value, small size, temperature coefficient is adjustable, and product structure reliability is high; And cavity and dielectric resonator thermal coefficient of expansion high conformity.
For achieving the above object, the technical solution used in the present invention is:
A novel cavity dielectric cavity fluid filter, comprises cavity and dielectric resonator, and described dielectric resonator is the cylinder with through hole; Described dielectric resonator is comprised of the component of following quality percentage composition:
The calcium carbonate 29 ~ 32% of purity 97.5%,
The aluminium oxide 9 ~ 11% of purity 97.5%,
The neodymia 21 ~ 25% of purity 99.5%,
The titanium dioxide 35 ~ 38% of purity 99.6%;
The metal-coated layer in described dielectric resonator one end, this dielectric resonator other end is welded in cavity;
Described cavity is comprised of the component of following quality percentage composition:
Aluminium oxide 95 ~ 96%,
Calcium carbonate 2 ~ 3%,
Lanthana 0.8 ~ 1.5%,
Samarium oxide 0.2 ~ 0.5%;
Dielectric constant is that 9.5 alumina medium material monolithic dry-pressing is fired into cavity.
Further improved plan in technique scheme is as follows:
1,, in such scheme, described dielectric resonator is comprised of the component of following quality percentage composition:
The calcium carbonate 30.5% of purity 97.5%,
The aluminium oxide 10% of purity 97.5%,
The neodymia 23% of purity 99.5%,
The titanium dioxide 36.5% of purity 99.6%.
2,, in such scheme, described cavity inner wall surface roughness is about 0.8.
3,, in such scheme, described cavity obtains through following technique:
Step 1, aluminium oxide 95 ~ 96%, calcium carbonate 2 ~ 3%, lanthana 0.8 ~ 1.5%, samarium oxide 0.2 ~ 0.5% evenly mixed and obtain mixed powder;
Step 2, mixed powder mist projection granulating is shaped to density 2.25 ~ 2.32g/cm3 base substrate by hydraulic press;
Step 3, with 110 ℃/h speed, be warming up to 800 ℃, then be warming up to 1350 ℃ with 300 ℃/h speed, be incubated after 1.5 hours, then be down to 1000 ℃ with 200 ℃/h rate of temperature fall, then be cooled to 500 ℃ with 700 ~ 730 ℃/h speed, then Chang Leng;
Step 4, at described cavity inner wall, cover a metal level.
4, in such scheme, further comprising the steps of between described step 1 and step 2:
Step 1, the mixed powder of step 1, water and ball are mixed according to 1:1.2:2 ratio, after transit mixer continuous stirring is evenly mixed for 3 ~ 5 hours, through baking oven, obtaining the powder after drying;
Step 2, in granulation tower, powder, glue, release agent and dispersant after drying are carried out to granulation according to 100:10:2:0.7 weight part ratio and obtain powder granule, this powder granule diameter≤0.5um;
Step 3, fully stir after described powder granule and leach and stir after ball, in the baking oven of 100 ℃, obtain dry after powder granule.
5,, in such scheme, described cavity inner wall is covered with the technique of metal level by sputter or electroless plating and realizes.
Because technique scheme is used, the present invention compared with prior art has following advantages:
1, novel cavity dielectric cavity fluid filter of the present invention, high Q value, small size, the Electric and magnetic fields that accompanying drawing 5-6 has provided TM distributes, provided simultaneously 3D electromagnetism distribution map in Ansoft three-dimensional finite element simulation software to checking, as accompanying drawing can be found out, TM is the dielectric resonator of main mould, magnetic field is to take the concentric circles that the central shaft of dielectric resonator is the center of circle, its electric field is the parallel lines that are parallel to dielectric resonator, compare with the resonator of metal material, the magnetic field of TM mould is more concentrated in medium, and electric field is stronger in top of media and bottom, center at medium is also quite strong.In other words, because the field of TM mould is more concentrated in medium, thereby Q value is more much higher than metal resonators, the filter loss that the TM of take is main mould is low, frequency characteristic is more precipitous, is particularly applied to the oscillator of TM mould, has very wide tuning range, good temp characteristic, volume is little, reliability is high.
2, novel cavity dielectric cavity fluid filter of the present invention, has wider tuning range, and the magnetic field of TM mould dielectric resonator is to take the concentric circles that the central shaft of dielectric resonator is the center of circle, and its electric field is the parallel lines that are parallel to dielectric resonator.When being applied to TM Mould Breadth band tunable oscillator, in device (field effect transistor or Geng Shiguan) centering hole, the field of excitation TM mould, in actual oscillating structure, field effect transistor is fixed on the can of oscillator, has so both made grounded drain, can move up and down again, regulate the degree of coupling of pipe and dielectric resonator, easily.In order to realize oscillator tuning, tuner can be moved up and down, both can complete frequency tuning, the output coupling of resonator can adopt loop coupling or probe coupling.Experimental data proves, this resonator is under assigned frequency, and it is 3%～4% that tuning range can reach the general tuning range of 7%～10%.TE mould resonator.
3, novel cavity dielectric cavity fluid filter of the present invention, its temperature coefficient is adjustable, filter and the duplexer of base station radio-frequency part mostly adopt silver-plated metal coaxial cavity by cavity resonator at present, Q value limited (Qu is about 3500) due to this coaxial cavity, and resonance frequency temperature stability is very poor, and the cavity that the alumina ceramic material that the TM mould dielectric resonator that the ceramic material that the dielectric constant that the present invention adopts is 45 is made and dielectric constant are 9.5 is made into.In material prescription, by adding a small amount of rare earth element, temperature coefficient be may be adjusted to unanimously within the specific limits.Make whole dielectric cavity fluid filter have extraordinary adjustable temperature coefficient.
4, novel cavity dielectric cavity fluid filter of the present invention, high welding reliability, current TM dielectric cavity fluid filter is all the cavity being made into aluminium alloy, this class cavity metal material, when welding with TM mould dielectric resonator, difference due to storeroom temperature performance, after causing high-temperature soldering cooling, Material shrinkage ratio is inconsistent, and make originally be welded on after variations in temperature destroyed, thereby make properties of product destroyed, and use aluminium oxide cavity, because aluminium oxide itself is also media ceramic, temperature coefficient can follow TM mould resonator consistent by furnishing, after welding, there is better reliability like this, can avoid the situation of damaged fracture to occur.
5, novel cavity dielectric cavity fluid filter of the present invention, due to limiting to of traditional machine work cavity itself, Q value can only reach 6500 ~ 7000, but this cavity forming mould adopts the even fine particle of whole mirror finishes processing and alumina powder and adopts the factors such as large-scale powder hydraulic press device, so its surface roughness can reach 0.8 left and right, therefore can make the Q value of product rise to more than 7000 with regard to cavity reason.
6, novel cavity dielectric cavity fluid filter of the present invention, the material that this cavity adopts is aluminium oxide ceramics powder, the market price is low, only uses half left and right of aluminium price.This cavity adopts mould compressing, is applicable to batch production.Because adopting mold polish to process, make the surface roughness of this cavity greatly be better than traditional cavity, electroplating cost greatly reduces.The welding yields of this cavity and dielectric resonator promotes greatly.Thereby the cost that makes whole product has significantly decline, more has the market advantage.
Accompanying drawing explanation
Accompanying drawing 1 is novel cavity dielectric cavity fluid filter structural representation of the present invention;
Accompanying drawing 2 is cavity sintering temperature-time diagram of the present invention;
Accompanying drawing 3 is dielectric resonator structural representation of the present invention;
Accompanying drawing 4 is cavity of the present invention and dielectric resonator structural representation;
Accompanying drawing 5 is the 3D distribution map of the electric field in Ansoft three-dimensional finite element of the present invention simulation software;
Accompanying drawing 6 is the 3D Distribution of Magnetic Field figure in Ansoft three-dimensional finite element of the present invention simulation software.
In above accompanying drawing: 1, cavity; 2, dielectric resonator; 3, through hole; 4, cylinder; 5, silver layer.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Embodiment 1 ~ 3: a kind of novel cavity dielectric cavity fluid filter, comprise cavity 1 and dielectric resonator 2, and described dielectric resonator is the cylinder 4 with through hole 3; Described dielectric resonator 2 forms as shown in table 1 by the component of following quality percentage composition:
Table 1
Described dielectric resonator 2 one end plating have silver layer 5, and these dielectric resonator 2 other ends are welded in cavity 1;
Described cavity 1 is as shown in table 2 by the component of following quality percentage composition:
Table 2
| ? | Aluminium oxide | Calcium carbonate | Lanthana | Samarium oxide |
| Embodiment 1 | 95% | 3% | 1.5% | 0.5% |
| Embodiment 2 | 95.5% | 3% | 1.1 % | 0.4% |
| Embodiment 3 | 96% | 2.5% | 1 % | 0.5% |
Described cavity 1 dielectric constant is 9.5.
Above-mentioned dielectric resonator 2 is comprised of the component of following quality percentage composition:
The calcium carbonate 30.5% of purity 97.5%,
The aluminium oxide 10% of purity 97.5%,
The neodymia 23% of purity 99.5%,
The titanium dioxide 36.5% of purity 99.6%.
Above-mentioned cavity 1 inner wall surface roughness is about 0.8.
Above-mentioned cavity 1 obtains through following technique:
Step 1, aluminium oxide 95 ~ 96%, calcium carbonate 2 ~ 3%, lanthana 0.8 ~ 1.5%, samarium oxide 0.2 ~ 0.5% evenly mixed and obtain mixed powder;
Step 2, mixed powder mist projection granulating is shaped to density 2.25 ~ 2.32g/cm3 base substrate by hydraulic press;
Step 3, with 110 ℃/h speed, be warming up to 800 ℃, then be warming up to 1350 ℃ with 300 ℃/h speed, be incubated after 1.5 hours, then be down to 1000 ℃ with 200 ℃/h rate of temperature fall, then be cooled to 500 ℃ with 700 ~ 730 ℃/h speed, then Chang Leng;
Step 4, at described cavity 1 inwall, cover a metal level.
Further comprising the steps of between above-mentioned steps one and step 2:
Step 1, the mixed powder of step 1, water and ball are mixed according to 1:1.2:2 ratio, after transit mixer continuous stirring is evenly mixed for 3 ~ 5 hours, through baking oven, obtaining the powder after drying;
Step 2, in granulation tower, powder, glue, release agent and dispersant after drying are carried out to granulation according to 100:10:2:0.7 weight part ratio and obtain powder granule, this powder granule diameter≤0.5um;
Step 3, fully stir after described powder granule and leach and stir after ball, in the baking oven of 100 ℃, obtain dry after powder granule.
Above-mentioned cavity 1 inwall is covered with the technique of metal level by sputter or electroless plating and realizes.
The performance of comparative example is as shown in table 3:
Table 3
| ? | Type | Insertion loss | Temperature is floated | Q value | Reliability |
| Comparative example 1 | Wire chamber+metal resonators | ≤0.8 | ≤10ppm | 5000 | Performance is affected by environment larger |
| Comparative example 2 | Wire chamber+dielectric resonator | ≤0.6 | ≤5ppm | 6000 | Performance is affected by environment less |
| The present invention | Aluminium oxide chamber+dielectric resonator | ≤0.48 | ≤3ppm | 7000 | Performance is affected by environment very little |
The further content of above-described embodiment is described below.
1, mould frequency characteristic and the architectural characteristic in metallization aluminium oxide ceramics chamber according to media ceramic, attempts utilizing theoretical formula to calculate the method for designing of being combined with Ansoft three-dimensional finite element simulation 4G is communicated by letter and carried out simulation and design with TM mould dielectric resonator and dielectric cavity fluid filter.
2, in formula by adding the rare earth element of specific components and content to adjust the thermal coefficient of expansion of the thermal coefficient of expansion resonator material of alumina material, the thermal coefficient of expansion of the two is reached unanimity, after the dielectric resonator that guarantees to be welded, be subject to the reliability of improving product in temperature shock situation.
3, by heating curve and the slow cooling technique of optimizing, improve the ion degree of order in material, Q value is increased substantially.
4, customization aluminium oxide cavity mold, by draft angle reasonable in design (according to the different degree of depth, drafting angle is 1 ° ~ 3 °) and under the requirement that does not increase product design size, design rational wall thickness, for meeting the requirement of technique, be generally designed to the thickness of 3mm～5mm.And by great tonnage hydraulic machine, alumina powder is pressed into the cavity geometry designing, and cavity does not only carry the container of resonator, the path of microwave transmission especially, and the decisive factor being coupled between resonant cavity, can improve the decisive factor of the Q value of filter especially.
5, the high temperature sintering of aluminium oxide cavity, the high temperature sintering curve of See Figure.After aluminium oxide cavity sinters, adopt the mode of soaking silver or electroless plating to make aluminium oxide cavity realize surface metalation.
6, in the installation process of resonator and aluminium oxide cavity, pass through the slow thermal weld technique of slow cooling, improved the evenness of soldering paste, thawing degree, has eliminated the probability that breaks under device installation and high low temperature working condition.
Preparation method is as follows:
1, this project is passed through the mould field selection to dielectric resonator, mould frequency characteristic and the research of the architectural characteristic of resonator to the properties influence of TM mould own of TM mould, and uses the theoretical method for designing of being combined with Ansoft three-dimensional finite element simulation of calculating to set up 3D electromagnetic model to key technology.Predicted Electric Field Distribution form and the Distribution of Magnetic Field form of resonator, determined that affecting dielectric resonator mould field selects, a series of key factors of frequency characteristic, successfully obtain centre frequency 2350MHZ, Q:7000min, TM mould dielectric resonator.Test single chamber φ 37 * 33 as Fig. 6.Than the TE mould dielectric resonator volume of same frequency little nearly half, tuning range is large one times, mode separation is better, in the stopband of octave, there is no parasitic mode.
2, in aluminium oxide formula, pass through to add the oxides such as a small amount of samarium oxide and titanium dioxide, improved the microstructure of sintered sample, successfully prevented the reduction of appraising at the current rate of Ti.Make the thermal coefficient of expansion after aluminium oxide cavity sintering reach 5 ~ 6PPm/ ℃, frequency-temperature coefficient is-2～-4 PPm/ ℃
3, the Samarium Nitrate sm of the dielectric material of resonator particular combination and content in formula, iridium Y, the compound interpolation of lanthanum La, makes mould resonant Q value reach 7000, frequency-temperature coefficient+2 ~+4 PPm/ ℃, thermal coefficient of expansion also reaches 5 ~ 6 PPm/ ℃.
4, secondly, in dry pressuring forming process, adopted the two-way self-pressurization of high sophisticated technology in a set of current die industry to take out punch die, large pressure, in the situation of complex appearance, one-shot forming, and take out hole under the pressure of pressurize 5000KN.Having reduced the internal stress of structure, solved the inconsistent industry difficult problem of sintering warpage and shrinkage, is the aluminium oxide cavity after molding and firing processes.
6, surface metalation, this cavity can adopt sputter or adopt the surface metalation of the process enforcement medium aluminium oxide cavity of electroless plating.
7, the welding of the medium aluminium oxide cavity after surface metal metallization processes and media ceramic resonator, the temperature coefficient in conventional aluminum chamber is-20 ~-24 PPm/ ℃, the temperature coefficient of medium aluminium oxide cavity is-2 ~-4 PPm/ ℃, the temperature coefficient of TM mould dielectric resonator is 2 ~ 4 PPm/ ℃, uses this cavity and TM mould resonator in conjunction with the temperature drift that can better control product.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (1)
1. a novel cavity dielectric cavity fluid filter, is characterized in that: comprise cavity (1) and dielectric resonator (2), described dielectric resonator is for having the cylinder (4) of through hole (3); Described dielectric resonator (2) is comprised of the component of following quality percentage composition:
The calcium carbonate 29 ~ 32% of purity 97.5%,
The aluminium oxide 9 ~ 11% of purity 97.5%,
The neodymia 21 ~ 25% of purity 99.5%,
The titanium dioxide 35 ~ 38% of purity 99.6%;
Described dielectric resonator (2) one end plating has silver layer (5), and this dielectric resonator (2) other end is welded in cavity (1);
Described cavity (1) is comprised of the component of following quality percentage composition:
Aluminium oxide 95 ~ 96%,
Calcium carbonate 2 ~ 3%,
Lanthana 0.8 ~ 1.5%,
Samarium oxide 0.2 ~ 0.5%;
Described cavity (1) relative dielectric constant is 9.5.
2. cavity medium cavity body filter according to claim 1, is characterized in that: described cavity (1) inner wall surface roughness is about 0.8.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410422614.9A CN104157951B (en) | 2012-11-27 | 2012-11-27 | The manufacture method of communication base station waveguide filter |
| CN201210492253.6A CN102969549B (en) | 2012-11-27 | 2012-11-27 | Novel medium cavity filter with cavity |
| CN201410420800.9A CN104600412B (en) | 2012-11-27 | 2012-11-27 | Microwave dielectric resonator |
| CN201410421291.1A CN104157950B (en) | 2012-11-27 | 2012-11-27 | Manufacturing process for adjustable cavity filter |
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| CN201210492253.6A CN102969549B (en) | 2012-11-27 | 2012-11-27 | Novel medium cavity filter with cavity |
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| CN201410420800.9A Division CN104600412B (en) | 2012-11-27 | 2012-11-27 | Microwave dielectric resonator |
| CN201410421291.1A Division CN104157950B (en) | 2012-11-27 | 2012-11-27 | Manufacturing process for adjustable cavity filter |
| CN201410422614.9A Division CN104157951B (en) | 2012-11-27 | 2012-11-27 | The manufacture method of communication base station waveguide filter |
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| CN102969549B true CN102969549B (en) | 2014-10-15 |
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| CN103928731A (en) * | 2014-04-30 | 2014-07-16 | 华为技术有限公司 | TEM mode dielectric filter and manufacturing method |
| CN104201449A (en) * | 2014-09-10 | 2014-12-10 | 江苏贝孚德通讯科技股份有限公司 | Miniaturized coaxial filter |
| CN104270116A (en) * | 2014-09-16 | 2015-01-07 | 张家港保税区灿勤科技有限公司 | Tuning screw, manufacturing technology thereof and L-waveband LC tunable filter with tuning screw |
| CN106654476B (en) * | 2017-01-12 | 2020-02-18 | 华南理工大学 | Four-mode dielectric band-pass filter |
| CN109167139B (en) * | 2018-08-20 | 2021-05-28 | 京信通信技术(广州)有限公司 | Cavity device and antenna |
| CN112305652A (en) * | 2019-07-26 | 2021-02-02 | 南京大学 | Infrared filter |
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| US5525562A (en) * | 1994-01-25 | 1996-06-11 | Matsushita Electric Industrial Co., Ltd. | Dielectric ceramic compound |
| CN101555135A (en) * | 2009-05-05 | 2009-10-14 | 张家港保税区灿勤科技有限公司 | Microwave medium ceramic material with ultrahigh Q-value middle dielectric constant |
| CN101800348A (en) * | 2010-04-01 | 2010-08-11 | 张家港保税区灿勤科技有限公司 | TM membrane dielectric resonator |
| CN101834338B (en) * | 2010-04-22 | 2013-01-02 | 张家港保税区灿勤科技有限公司 | TM (Transverse Magnetic) mode dielectric resonator for controlling second harmonic migration |
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