CN102584214A - Environment-friendly microwave dielectric ceramic material for small precise antenna - Google Patents

Abstract

The invention relates to an environment-friendly microwave dielectric ceramic material for a small precise antenna, which is applied to a dielectric resonator and a filter in a receiving-transmitting satellite communication system of the small precise antenna and an oscillator, a mobile phone antenna, a global position system (GPS) and other microwave elements and devices. Raw materials for manufacturing the environment-friendly microwave dielectric ceramic material mainly comprise calcium carbonate (CaCO3), titanium dioxide (TiO2), samarium oxide (Sm2O3), lithium carbonate (LiCO3) and a trace of additives including zinc oxide (ZnO), cobaltic oxide (Co2O3), bismuth trioxide (Bi2O3) and lanthanum trioxide (La2O3). The environment-friendly microwave dielectric ceramic material has low firing temperature energy conservation, high dielectric constant, high quality factors and stable resonant frequency-temperature characteristics.

Description

A kind of miniature precision antenna is used the environment friendly microwave medium stupalith

Technical field

The present invention relates to a kind of miniature precision antenna and use the environment friendly microwave medium stupalith.Being applied to the miniature precision antenna receives in satellite communication system medium resonator, wave filter and the microwave devices such as vibrator, antenna for mobile phone and GPS GPS.

Background technology

At present; Fast development along with China Aerospace science and technology, satellite communication; To form multiwave fixedly broadcast communication satellite, dedicated broadcast satellite, direct broadcasting satellite, mobile broadcast satellite, moving communication satellite and special-purpose GPS global location when the time comes, the safety navigation satellite.And with the IP business be master's data service to further the increasing of transmission bandwidth demand, more the miniature precision antenna development and application of L-band more and more becomes the emphasis that people pay close attention to.Also driven simultaneously demand to relevant microwave devices such as microwaves corresponding resonator, wave filter, vibrator, microwave capacitors devices.The frequency that satellite communication broadcasting is used usually is S, L, C, Ku, wave band; Resonant frequency temperature profile and volume for the miniature precision antenna microwave media ceramic that is applied to type requires to have high specific inductivity (85～120), hi-q is stable are little, low price etc.

CaCO ₃TiO ₂LiCO ₃Sm ₂O ₃Material is a kind of titanate microwave ceramics of excellent performance, through mixing and other means can obtain to have suitable and adjustable specific inductivity, and hi-q and good resonant frequency temperature profile.CaCO in the prior art ₃TiO ₂LiCO ₃Sm ₂O ₃General employing oxide compound mixes solid state reaction with additive and sends out preparation, through prescription weighing, ball milling, calcining, pulverizing, granulation, moulding, dress alms bowl, binder removal and operations such as sintering and metalized, carries out the detection of ceramic performance at last.This method technology is simple, is easy to suitability for industrialized production, and material property is stable.

Summary of the invention

Technical problem to be solved by this invention is: provide a kind of miniature precision antenna with environmental protection micro medium ripple pottery, it has, and low firing temperature is energy-conservation, high-k, the stable resonant frequency temperature profile of hi-q.It is applied to miniature precision antenna medium resonator, wave filter, vibrator, GPS global location, in the safety navigation system, can make the little low price of volume.

Technical scheme to be solved by this invention is following:

A kind of miniature precision antenna is used the environment friendly microwave medium stupalith, makes to contain main powder composition in the raw material: lime carbonate (CaCO ₃); Titanium oxide (TiO ₂); Samarium sesquioxide (Sm ₂O ₃); Quilonum Retard (LiCO ₃) and micro-additive: zinc oxide (ZnO), cobalt sesquioxide (Co ₂O ₃) and bismuthous oxide bismuth trioxide (Bi ₂O ₃) component, it is characterized in that: also contain lanthanum sesquioxide (La in the said micro-additive ₂O ₃) component, each components contents is:

Lime carbonate 24～28%; Titanium oxide 26～30 %;

Samarium sesquioxide 25～30%; Quilonum Retard 15～20%;

Zinc oxide 1～3 %; Cobalt sesquioxide 0.5～3%;

Bismuthous oxide bismuth trioxide 0.1～1 %; Lanthanum sesquioxide 0.2～1%;

Said components is fired into microwave dielectric ceramic materials through weighing, mixing and ball milling, calcining, pulverizing, granulation, moulding, dress alms bowl, binder removal and agglomerating solid state reaction operation.

Its concrete method of manufacture is:

1. earlier powder lime carbonate, titanium oxide, samarium sesquioxide, Quilonum Retard, zinc oxide and cobalt sesquioxide are weighed by the component requirement, the barrel ball milling of putting into ball mill stirred 6-8 hour;

2. put into High Temperature Furnaces Heating Apparatus after will grinding good powder press filtration, kindling temperature to 800-1100 ℃ of drying and calcining once accomplished, and the time is 2-5 hour;

3. will calcine material and pulverize, add bismuthous oxide bismuth trioxide and lanthanum sesquioxide batch mixing, add the 1%PVA aqueous solution granulation of powder weight again;

4. dry-pressing formed, the forming pressure 200-300MPa of compression moulding, and dress alms bowl;

5. 1100-1250 ℃ of down insulation 2～4 hours, the binder removal sintering is once accomplished and is promptly made said miniature precision antenna and use microwave-medium ceramics.

The CaCO that the present invention adopts oxide compound and additive mixing solid reaction process to prepare ₃TiO ₂LiCO ₃Sm ₂O ₃Micro crystalline powder, and add that the crystal grain that micro-additive makes is tiny evenly, void content is low and the microwave-medium ceramics of excellent property.The microwave property that in the interpolation scope of each additive, can obtain to become reconciled.And domestic raw materials cost is low, can further strengthen the competitive power with external microwave ceramics, quickens the extensive application of homemade microwave ceramics.

Compared with prior art, the present invention has following characteristics:

1, prescription composition of the present invention does not contain heavy metal compositions such as lead, nickel, promptly the present invention is to provide a kind of environment friendly microwave dielectric pottery frequently.Meet the pollution-free requirement of environmental protection.And the lead-free standard and the waste electrical equipment that meet the up-to-date appearance of the European Community reclaim the RHOS of mark and the strict standard requirement of WEEE.Can in the product of high frequency field, use; Can product be exported to any country in the world.

2, by traditional sintering process 1300-1500 ℃, drop to below 1250 ℃, the further reduction of sintering temperature has more energy-conservation greater advantages.

3,Have a distinct increment on the performance: the conventional art prescription is at the specific inductivity 70-90 of miniature precision antenna; The Q value has only 1000-1500; Temperature coefficient of resonance frequency greater than ± more than the 30PPm; Prescription of the present invention is at the specific inductivity 85-120 of miniature precision antenna, and the Q value is up to more than 3500, and temperature coefficient of resonance frequency is less than in ± the 10PPm.

4, the present invention can be used as the miniature precision antenna with the key core material use of environment friendly microwave with electronic devices and components such as resonator, wave filter and vibrators; And be widely used in mobile communication, satellite communications, Global Positioning System (GPS), Bluetooth technology and WLAN modern communications industries such as (WLA), have the essential industry using value.

Description of drawings

Describe the present invention below in conjunction with accompanying drawing in detail with embodiment:

Fig. 1 is temperature and resonant frequency relation property trend map.

Fig. 2 is resonant frequency and quality factor figure.

Fig. 3 is the graph of a relation of quality factor q value and sintering temperature.

Embodiment:

Of the present inventionly be achieved through following scheme.

A kind of miniature precision antenna is used the environment friendly microwave medium stupalith, makes to contain main powder composition in the raw material: lime carbonate (CaCO ₃); Titanium oxide (TiO ₂); Samarium sesquioxide (Sm ₂O ₃); Quilonum Retard (LiCO ₃) and micro-additive: zinc oxide (ZnO), cobalt sesquioxide (Co ₂O ₃), bismuthous oxide bismuth trioxide (Bi ₂O ₃) component and lanthanum sesquioxide (La ₂O ₃) component.According to the proportioning and the method for manufacture of this principal constituent and micro-additive, table 1 provides the data of each embodiment, and table 2 provides the performance of each embodiment.

Table one:

Table two

Fig. 1～3 sum up prescription and changes of properties trend, can conveniently adjust prescription, obtain the microwave-medium ceramics of required performance.

Temperature among Fig. 1 and resonant frequency relation property trend map represent that resonant frequency changes between-30 ℃～+ 60 ℃, resonant frequency be 1.575GHZ the medium frequency partially at 5MHZ with interior (Tf=5ppm/ ℃), frequency stability characteristics is fine.Top Tf representes temperature coefficient of resonance frequency; △ f representes the resonance frequency deviation; T representes temperature.

The quality factor q value of the resonant frequency among Fig. 2; With the rising of frequency, the Q value can descend, behind frequency 8GHZ; The Q value drops to below 1000; Along with the continuation rising of frequency, the Q value can sharply descend, and explains that it is proper that this prescription media ceramic can be used in the following tank circuit of resonant frequency 10GHZ.

Quality factor q among Fig. 3 about 1250 ℃, and has very wide sintering range again as for the explanation of the graph of relation of sintering temperature or the optimal temperature of going to do the Q system.And this media ceramic is fit to low-temperature sintering, and sintering temperature should not be too high.

Claims (1)

1. a miniature precision antenna is used the environment friendly microwave medium stupalith, makes to contain main powder composition in the raw material: lime carbonate (CaCO ₃); Titanium oxide (TiO ₂); Samarium sesquioxide (Sm ₂O ₃); Quilonum Retard (LiCO ₃) and micro-additive: zinc oxide (ZnO), cobalt sesquioxide (Co ₂O ₃) and bismuthous oxide bismuth trioxide (Bi ₂O ₃) component, it is characterized in that: also contain lanthanum sesquioxide (La in the said micro-additive ₂O ₃) component, each components contents is:

Lime carbonate 24～28%; Titanium oxide 26～30 %;

Samarium sesquioxide 25～30%; Quilonum Retard 15～20%;

Zinc oxide 1～3 %; Cobalt sesquioxide 0.5～3%;

Bismuthous oxide bismuth trioxide 0.1～1 %; Lanthanum sesquioxide 0.2～1%;

Said components is fired into microwave dielectric ceramic materials through weighing, mixing and ball milling, calcining, pulverizing, granulation, moulding, dress alms bowl, binder removal and agglomerating solid state reaction operation.

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