Microwave dielectric ceramics (MWDC) is used in the microwave band (mainly UHF, SHF band, 300MHz ~ 300GHz) as ceramic dielectric materials and complete one or more functional circuits, at home and abroad in recent years on the research field of microwave dielectric material with a hot direction. This is mainly to adapt to the development needs of microwave mobile communications.
Microwave dielectric ceramics
The utility model is mainly used for microwave components such as resonators, filters, dielectric antennas, dielectric wave guides and the like. Can be used in mobile communications, satellite communications and military radar, etc.. With the development of science and technology change rapidly, the rapid increase of information quantity, and people's requirements for wireless communication, satellite communication and satellite broadcast television microwave communication system has become the inevitable trend of the development of communication technology.
Application of microwave materials in civil field
This makes the microwave materials and the gradually increasing demand in the civilian side, such as mobile phone, car phone, cordless phone, cellular mobile communication and satellite broadcast television and other new applications. In mobile phones, for example, in 2004 China's annual sales of 64 million mobile phones, and China's mobile phone market will grow at an annual rate of 20%, in the next year will reach sales of 100 million units. It can be seen that the microwave dielectric ceramics have great development space and market in the commercial application.
(L) miniaturization
(high dielectric constant R). It is well known that the miniaturization, high stability and low cost of microwave devices are the integration of microwave circuits. In the process of microwave circuit integration, the metal waveguide has realized the integration of planar microstrip, and the microwave tube has realized miniaturization. However, because of the volume and the weight of various metal resonators in the microwave circuit, it is difficult to integrate with the microstrip circuit. It is known that the size of the resonator is inversely proportional to the square root of the dielectric constant of the dielectric material. Therefore, the larger the dielectric constant of the dielectric material, the smaller the dielectric ceramic block and the smaller the size of the resonator. Therefore, microwave dielectric ceramics with high dielectric constant material is conducive to miniaturization of microwave dielectric filter, the filter with microstrip line microwave tube, a microwave integrated circuit hybrid, the device size reached millimeter, its price is much lower than the metal cavity. General requirements >1O.
high stability
(close to zero frequency temperature coefficient f). The working temperature of the communication device cannot be fixed. If the resonant frequency of the microwave dielectric material changes with the temperature, the carrier signal of the filter will drift at different temperatures, which will affect the performance of the equipment. This requires that the resonance frequency of the material can not change too much with the temperature. The actual temperature range is approximately 40 DEG -+100 DEG C, in this range, the frequency temperature coefficient of material f is not more than l0ppm/ DEG C. At present, the temperature coefficient of microwave dielectric ceramics can be used as high as 0 ppm/, which can achieve high stability and high reliability.
Low loss
(high quality factor Q). One of the important requirements of the filter is the low insertion loss and the dielectric loss of the microwave dielectric material is one of the main factors that affect the dielectric filter insertion loss. Q value of microwave dielectric material is inversely proportional to dielectric loss tand. The larger the Q value, the lower the insertion loss of the filter.
Application of microwave dielectric ceramics
At present, microwave dielectric ceramics has been in portable mobile phone, car phone, cordless telephone, satellite TV receiver, military radar etc. is used widely in manufacturing microwave dielectric filter and resonator, is playing an increasingly important role in miniaturization, modern communication tools integration process.
Patent technology of dielectric ceramics
1, alkali metal electrode multilayer ceramic capacitor dielectric material and preparation method thereof
2, PTFE ceramic composite material surface modification method
3, high dielectric constant low loss microwave dielectric ceramics
4, high dielectric constant microwave dielectric ceramics and preparation method thereof
5, a high dielectric constant microwave dielectric ceramics
6, low loss microwave dielectric ceramics
7, high dielectric constant microwave dielectric ceramics
8, a low loss microwave dielectric ceramics
9, microwave multilayer ceramic capacitor medium and its manufacturing method
10, low temperature medium microwave dielectric materials for sintered multilayer ceramic capacitors
11, high frequency mixed multiphase dielectric ceramic materials
12, lead based microwave dielectric ceramics and manufacturing method thereof
13, ceramic filter media
14, microwave dielectric ceramics
15, coating on ceramic filter medium corrosion resistance of aluminum melt glaze
16, microwave oven magnetron tube high voltage ceramic capacitor medium
17, microwave dielectric ceramics and its preparation method 2
18, high frequency dielectric ceramic composition and preparation process
19, a high voltage ceramic capacitor medium
20, high quality factor microwave ceramic medium and its manufacturing method
21, high dielectric constant, high stability, low loss ceramic dielectric material and its manufacturing method
22, a kind of light foamed ceramic dielectric ball and its manufacturing method
23, near zero frequency temperature coefficient perovskite type microwave dielectric ceramics and preparation method thereof
24, high performance low temperature sintered high frequency dielectric ceramics
25, high voltage ceramic capacitor medium manufacturing method
26, a method for preparing high dielectric constant microwave dielectric ceramics
27, microwave ceramic medium and its manufacturing method
28, the production process of small group of living water with ceramic particles as medium
29, ceramic grinding medium bead body
30, dielectric ceramic composition 2
31, high dielectric constant low temperature sintering microwave dielectric ceramics and its preparation method
32, a dielectric ceramic and its preparation method
33, microwave ceramic dielectric column resonance test fixture
34, barium strontium titanate and cordierite glass ceramic composite material preparation method
35, dielectric constant low temperature sintering microwave dielectric ceramics and its preparation method
36, microwave dielectric ceramics and its preparation method
37, a method for the preparation of cordierite based glass ceramic dielectric material for multilayer inductor
38, high frequency thermal stability ceramic dielectric material and preparation method thereof
39, high frequency high dielectric constant microwave dielectric ceramics and its processing method
40, dielectric ceramic powder, ceramic chip and laminated ceramic capacitor and manufacturing method thereof
41, a low temperature sintered solid solution microwave dielectric ceramic material
42, microwave dielectric ceramics and its preparation method
43, microwave dielectric ceramic composition
44, low temperature sintering multielement multiphase composite microwave dielectric ceramics and its preparation method
45, dielectric ceramics
46, a method for preparing zinc silicate based glass ceramic dielectric material for multilayer inductor
47, dielectric ceramic composition
48, the filter with high end of the band with improved dielectric properties of ceramic filter
49, ceramic dielectric material and its preparation method and method for producing ceramic capacitor
50, dielectric ceramic composition and laminated ceramic component using the same
51. Preparation of near end formed transparent ceramic laser medium
52. Preparation of near end formed transparent ceramic laser medium
53, anti reducing dielectric ceramic powder and its preparation method and method for preparing multilayer ceramic capacitor
54, high temperature and thermal stability of Titanium Barium neodymium ceramic dielectric material and multilayer chip ceramic capacitor
55, anti reducing thermal compensation ceramic dielectric material and ceramic capacitor made thereof
56, dielectric ceramic composition and capacitor using the same
57, barium titanate powder and its preparation method and evaluation method, dielectric ceramic and laminated ceramic capacitor
58, zinc magnesium titanate ceramic dielectric material and the resulting ceramic capacitor
59, super low temperature sintering ceramic dielectric material, its preparation method and the obtained capacitor
60, a method for the preparation of a thin dielectric multilayer chip ceramic capacitor
61, low temperature sintered dielectric ceramic composition and multilayer ceramic chip capacitor using the same
62, titanium barium series ceramic dielectric material and capacitor
63, low frequency fine crystal ceramic capacitor dielectric material preparation method
64, dielectric ceramic composition
65, dielectric ceramic composition and ceramic capacitor
66, fine grain high dielectric ceramic capacitor dielectric material and preparation method thereof
67, low temperature sintered low loss dielectric ceramic composition and its preparation method
68, dielectric ceramic composition and dielectric resonator
69, high frequency ceramic dielectric material, its preparation method and the obtained capacitor
70, the use of the laser as a magnetic recording medium on the glass ceramic substrate texture
71, ceramic capacitors with CZT dielectric
72, non reducing dielectric ceramic and monolithic ceramic capacitor
73, dielectric ceramic material for chip capacitor and preparation method thereof
74, dielectric ceramics with high dielectric constant and flat temperature coefficient
75, dielectric ceramic composition, capacitor using the composition and method of manufacturing the same
76, a multilayer ceramic dielectric filter
77, dielectric ceramic composition, capacitor using the composition and method of manufacturing the same, 2
78, dielectric ceramic powder and its manufacturing method and composite dielectric material
79, low temperature sintered dielectric ceramic composition, multilayer ceramic chip capacitor and ceramic electronic device
80, dielectric ceramic composition and monolithic ceramic capacitor
Dielectric ceramic powder mixture, containing 81 barium lithium borosilicate flux and magnesium zinc titanate powder
82, transition metal glass ceramic gain medium
83, nano ceramic material doping agent, high dielectric resistance multilayer ceramic capacitor dielectric material and the preparation method of the two
84, glass ceramic substrate for information storage medium, its manufacturing method and information storage medium disk
85, dielectric ceramic composition and electronic component
86, dielectric ceramic composition and manufacturing method thereof
87, glass substrate for information storage medium
88, glass ceramic substrate for magnetic information storage medium
89, dielectric ceramic and resonator using the same
90, dielectric ceramic composition and ceramic capacitor 3
91, magnetic information recording medium glass - ceramic substrate
92, dielectric ceramic composition and ceramic capacitor 2
93, the production of ceramic metal heat storage medium method and its products
94, dielectric ceramic composition and electronic component thereof
95, ceramic capacitor and its manufacturing method and dielectric laminated device
96, dielectric ceramics and electronic components
97, dielectric ceramic composition, laminated ceramic capacitor and manufacturing method thereof
98, ceramic film and manufacturing method, ferroelectric capacitor and its manufacturing method
99, ceramic and its manufacturing method, and dielectric capacitor, semiconductor device and component
