CN104270116A - Tuning screw, manufacturing technology thereof and L-waveband LC tunable filter with tuning screw - Google Patents
Tuning screw, manufacturing technology thereof and L-waveband LC tunable filter with tuning screw Download PDFInfo
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- CN104270116A CN104270116A CN201410471253.7A CN201410471253A CN104270116A CN 104270116 A CN104270116 A CN 104270116A CN 201410471253 A CN201410471253 A CN 201410471253A CN 104270116 A CN104270116 A CN 104270116A
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Abstract
The invention relates to the technical field of confidentiality wireless communication, in particular to a novel L-waveband LC tunable filter. The L-waveband LC tunable filter comprises a dielectric tuning screw, a high-Q inductor and a half lumped parameter capacitor. The dielectric tuning screw comprises, by mass, 29 percent to 32 percent of calcium carbonate with the purity of 97.5 percent, nine percent to 11 percent of aluminum oxide with the purity of 97.5 percent, 21 percent to 25 percent of neodymium oxide with the purity of 99.5 percent, 35.5 percent to 37 percent of neodymium oxide with the purity of 99.6 percent and 0.2 percent to 0.5 percent of samarium oxide with the purity of 99.6 percent. According to a capacitor of the LC tunable filter, a common tunable inductor is replaced by the high-Q inductor wound manually. The Q value can be about 180, the half lumped parameter capacitor is adopted to replace a common packaging capacitor, and the dielectric constant is 3.5. The L-waveband LC tunable filter is high in frequency, small in size, low in loss, large in receiving bandwidth, and stable and reliable in frequency characteristic.
Description
Technical field
The present invention relates to secure radio communication technical field, refer in particular to a kind of tuning screw and preparation technology thereof, and use its L-band LC tunable filter.
Background technology
Scout in many application scenarios such as monitoring system, active/passive radar in the military communication of current ocean and frequency spectrum, all require that Software Radio platform possesses performances such as receiving greatly bandwidth, high dynamic range, high receiving sensitivity, require that receiving function detects weak useful signal when large-signal or strong jamming coexist.These application facing challenges are the performance promoting simulation receiving front-end, analog-to-digital conversion and digital signal processing unit etc.Therefore in contemporary secure radio communication field, tunable optic filter is absolutely necessary one of assembly, in receivers between antenna and frequency mixer, its effect selects useful signal from a large amount of frequency spectrums received by antenna, suppress harmful interference spectrum, thus improve the signal to noise ratio of receiver, reach the object of resource-sharing, greatly improve the availability of frequency spectrum.
Traditional LC filter frequency is single, and for obtaining multiband, the LC filter of wide reception bandwidth, often needs the LC band pass filter of Integrated design multichannel, therefore needs to carry out a large amount of debugging efforts.Its adjustment method, often from the frequency domain characteristic of filter, is debugged repeatedly to each unit of filter, to obtain the filter of required band-pass response, low reflection loss and little passband fluctuation.But due to the interaction of each element of filter internal, we are difficult to determine which unit needs to carry out tuning, debug very complicated.
Summary of the invention
The technical problem to be solved in the present invention is: in order to overcome the problem that traditional LC filter frequency is single, debugging is complicated, the invention provides a kind of L-band LC tunable filter, adopt the tuning screw be made up of aluminium oxide, calcium carbonate, titanium dioxide, neodymia and samarium oxide, obtain a kind of high-frequency, small size, low-loss, receives bandwidth greatly, the L-band LC tunable filter that frequency characteristic is reliable and stable.
The technical solution adopted for the present invention to solve the technical problems is: a kind of tuning screw, is made up of the component of following masses percentage composition:
Particularly, the dielectric constant of described tuning screw is 36.
A kind of novel L-band LC tunable filter, comprises above-mentioned tuning screw, half lumped parameter electric capacity and metallic cavity.
Particularly, described metallic cavity (3) inner wall surface roughness is about 0.8.
A preparation technology for tuning screw, comprises the steps:
Step one, take aluminium oxide, calcium carbonate, titanium dioxide, neodymia and samarium oxide in proportion, the above-mentioned each component of Homogeneous phase mixing, obtain mixed powder;
Step 2, to mix in the mixture obtained in step one with water and ball, after transit mixer stirs 3 ~ 5 hours Homogeneous phase mixing continuously, dry, obtain powder;
Step 3, powder step 2 obtained, glue, release agent and dispersant carry out granulation according to 100:10:2:0.7 weight part ratio, obtain powder granule;
Step 4, the powder granule mist projection granulating will obtained in step 3, then extrusion modling, obtains base substrate;
Step 5, base substrate step 4 obtained sinter, and cool, and obtain tuning screw;
Step 6, cover a metal level at described cavity inner wall.
Particularly, in described step 2, the mixed proportion of mixed powder, water and ball is 1:1.2:2.
Particularly, the powder granule diameter≤0.5um obtained in described step 3.
Particularly, in described step 5, the density of base substrate is 2.35 ~ 2.43g/cm
3.
Particularly, in described step 6, sintering process is: with 110 DEG C/h ramp to 800 DEG C, then with 300 DEG C/h ramp to 1350 DEG C, be incubated after 1.5 hours, be down to 1000 DEG C with 200 DEG C/h rate of temperature fall again, then be cooled to 500 DEG C with 700 ~ 730 DEG C/h speed, then normal temperature cooling.
Particularly, described binding agent to be mass fraction be 12% polyvinyl alcohol water solution, described dispersant is one or both in water and absolute ethyl alcohol, and described release agent is aluminium oxide powder.
The invention has the beneficial effects as follows: novel L-band LC tunable filter of the present invention compared with prior art has following advantages:
1, the present invention's novel L-band LC tunable filter has wider frequency reception characteristic (tuning range is wider), dielectric tuning screw is adopted to carry out frequency adjustment, utilize medium screw rod and which couple index variation to reach adjustment to filter frequencies, instead of general adjustable LC filter and utilize controllable impedance to regulate frequency.This kind of novel passive tunable filter, what inductance adopted is the high Q inductance of manual coiling, Q value can up to about 180, the half lumped parameter electric capacity that electric capacity adopts substitutes general encapsulation electric capacity, Q value can up to more than 10000, dielectric constant is about 3.5. the frequency tuning range of this kind of LC tunable filter can reach 200M ~ 300M, only has 2M ~ 10M compared to the frequency tuning of general LC tunable filter.Frequency tuning range has widened 100 times, and passband damage does not have deterioration;
2, the present invention's novel L-band LC tunable filter has less volume, is convenient to integrated.Common LC tunable filter is for obtaining multiband, the LC filter of wide reception bandwidth, often needs the LC band pass filter of Integrated design multichannel, due to the interaction of each element of filter internal, we are difficult to determine which unit needs to carry out tuning, debug very complicated.But adopt this kind of novel passive tunable filter, tuning range about 1.5 ~ 1.95Ghz, only need design single channel LC band pass filter, obtain less volume, more low-loss, debugging is simple, be convenient to batch production;
3, the present invention novel L-band LC tunable filter, its temperature coefficient adjustable, adopt the common LC tunable filter of controllable impedance at present, its resonance frequency temperature stability is very poor, and the tuning screw that the ceramic material that the dielectric constant that the present invention adopts is 36 is made.By adding a small amount of rare earth element in material prescription, temperature coefficient be may be adjusted to unanimously within the specific limits.Whole LC tunable filter is made to have extraordinary tuneable temperature coefficient.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the structural representation of L-band LC tunable filter of the present invention.
Fig. 2 is the internal structure schematic diagram of L-band LC tunable filter of the present invention
In figure: 1. tuning screw, 2. half lumped parameter electric capacity, 3. metallic cavity.
Embodiment
Below in conjunction with specific embodiment, further the present invention is set forth, should be understood that and quote embodiment only for illustration of the present invention, and be not used in and limit the scope of the invention.
Embodiment 1
A kind of tuning screw, is made up of the component of following masses percentage composition: the calcium carbonate 31.5% of purity 97.5%,
A kind of novel L-band LC tunable filter, comprise above-mentioned tuning screw 1, half lumped parameter electric capacity 2 and metallic cavity 3, metallic cavity, 3 inner wall surface roughness are about 0.8.
A preparation technology for tuning screw, comprises the steps:
Step one, take aluminium oxide, calcium carbonate, titanium dioxide, neodymia and samarium oxide in proportion, the above-mentioned each component of Homogeneous phase mixing, obtain mixed powder;
Step 2, mix in the mixture obtained in step one with water and ball, the mixed proportion of mixed powder, water and ball is 1:1.2:2, after transit mixer stirs 3 ~ 5 hours Homogeneous phase mixing continuously, dries, obtains powder;
Step 3, powder step 2 obtained, glue, release agent and dispersant carry out granulation according to 100:10:2:0.7 weight part ratio, obtain the powder granule of diameter≤0.5um;
The powder granule obtained in step 4, fully whipping step three, and leach stirring ball, dry, obtain drying powder granule;
Step 5, the oven dry powder particle spray granulation will obtained in step 4, then extrusion modling, obtaining density is 2.35 ~ 2.43g/cm
3base substrate;
Step 6, base substrate step 5 obtained sinter, sintering condition is with 110 DEG C/h ramp to 800 DEG C, again with 300 DEG C/h ramp to 1350 DEG C, be incubated after 1.5 hours, 1000 DEG C are down to again with 200 DEG C/h rate of temperature fall, 500 DEG C are cooled to again with 700 ~ 730 DEG C/h speed, then normal temperature cooling, obtain tuning screw;
The performance contrasting common LC tunable filter and a kind of novel L-band LC tunable filter of the present invention is as follows:
Embodiment 2
A kind of tuning screw, is made up of the component of following masses percentage composition: the calcium carbonate 31.5% of purity 97.5%,
Embodiment 3
Embodiment 1
A kind of tuning screw, is made up of the component of following masses percentage composition: the calcium carbonate 31.5% of purity 97.5%,
With above-mentioned according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on specification, must determine its technical scope according to right.
Claims (10)
1. a tuning screw, is characterized in that being made up of the component of following masses percentage composition:
2. a kind of tuning screw as claimed in claim 1, is characterized in that: the dielectric constant of described tuning screw is 36.
3. a novel L-band LC tunable filter, is characterized in that: comprise tuning screw as claimed in claim 1 or 2 (1), half lumped parameter electric capacity (2) and metallic cavity (3).
4. a kind of novel L-band LC tunable filter as claimed in claim 3, is characterized in that: described metallic cavity (3) inner wall surface roughness is 0.8.
5. a preparation technology for tuning screw as claimed in claim 1 or 2, is characterized in that comprising the steps:
Step one, take aluminium oxide, calcium carbonate, titanium dioxide, neodymia and samarium oxide in proportion, the above-mentioned each component of Homogeneous phase mixing, obtain mixed powder;
Step 2, to mix in the mixture obtained in step one with water and zirconia balls, after transit mixer stirs 3 ~ 5 hours Homogeneous phase mixing continuously, dry, obtain powder;
Step 3, powder step 2 obtained, binding agent, release agent and dispersant carry out granulation according to 100:10:2:0.7 weight part ratio, obtain powder granule;
Step 4, the powder granule mist projection granulating will obtained in step 3, then extrusion modling, obtains base substrate;
Step 5, base substrate step 4 obtained sinter, and cool, and obtain tuning screw;
Step 6, cover a metal level at described cavity (3) inwall.
6. the preparation technology of a kind of tuning screw as claimed in claim 5, is characterized in that: in described step 2, the mixed proportion of mixed powder, water and ball is 1:1.2:2.
7. the preparation technology of a kind of tuning screw as claimed in claim 5, is characterized in that: the powder granule diameter≤0.5um obtained in described step 3.
8. the preparation technology of a kind of tuning screw as claimed in claim 5, is characterized in that: in described step 5, the density of base substrate is 2.35 ~ 2.43g/cm
3.
9. the preparation technology of a kind of tuning screw as claimed in claim 5, it is characterized in that: in described step 6, sintering process is: with 110 DEG C/h ramp to 800 DEG C, again with 300 DEG C/h ramp to 1350 DEG C, be incubated after 1.5 hours, 1000 DEG C are down to again with 200 DEG C/h rate of temperature fall, 500 DEG C are cooled to again with 700 ~ 730 DEG C/h speed, then normal temperature cooling.
10. the preparation technology of a kind of tuning screw as claimed in claim 5, it is characterized in that: described binding agent to be mass fraction be 12% polyvinyl alcohol water solution, described dispersant is one or both in water and absolute ethyl alcohol, and described release agent is aluminium oxide powder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410471253.7A CN104270116A (en) | 2014-09-16 | 2014-09-16 | Tuning screw, manufacturing technology thereof and L-waveband LC tunable filter with tuning screw |
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| CN201410471253.7A CN104270116A (en) | 2014-09-16 | 2014-09-16 | Tuning screw, manufacturing technology thereof and L-waveband LC tunable filter with tuning screw |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110571502A (en) * | 2019-08-28 | 2019-12-13 | 深圳大学 | Adjustable filter |
| CN113725571A (en) * | 2020-05-20 | 2021-11-30 | 大富科技(安徽)股份有限公司 | Tuning screw, filter and communication equipment |
Citations (5)
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|---|---|---|---|---|
| JP2001114553A (en) * | 1999-10-18 | 2001-04-24 | Ngk Spark Plug Co Ltd | Microwave dielectric substance ceramic composition |
| KR100399800B1 (en) * | 2000-11-21 | 2003-09-29 | 주식회사에스지테크놀러지 | High quality ceramic dielectric composition |
| CN101565300A (en) * | 2008-04-25 | 2009-10-28 | 浙江大学 | Low-loss microwave dielectric ceramics |
| 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 |
| CN102969549A (en) * | 2012-11-27 | 2013-03-13 | 张家港保税区灿勤科技有限公司 | Novel medium cavity filter with cavity |
-
2014
- 2014-09-16 CN CN201410471253.7A patent/CN104270116A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001114553A (en) * | 1999-10-18 | 2001-04-24 | Ngk Spark Plug Co Ltd | Microwave dielectric substance ceramic composition |
| KR100399800B1 (en) * | 2000-11-21 | 2003-09-29 | 주식회사에스지테크놀러지 | High quality ceramic dielectric composition |
| CN101565300A (en) * | 2008-04-25 | 2009-10-28 | 浙江大学 | Low-loss microwave dielectric ceramics |
| 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 |
| CN102969549A (en) * | 2012-11-27 | 2013-03-13 | 张家港保税区灿勤科技有限公司 | Novel medium cavity filter with cavity |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110571502A (en) * | 2019-08-28 | 2019-12-13 | 深圳大学 | Adjustable filter |
| CN113725571A (en) * | 2020-05-20 | 2021-11-30 | 大富科技(安徽)股份有限公司 | Tuning screw, filter and communication equipment |
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Application publication date: 20150107 |