What is dielectric porcelain?

Microwave dielectric ceramics Microwave dielectric ceramics (MWDC) refers to ceramics used as dielectric materials and performing one or more functions in microwave frequency bands (mainly UHF and SHF frequency bands, 300 MHz ~ 300 GHz). It is a research hotspot in the field of microwave dielectric materials at home and abroad in recent years. This is mainly to meet the development needs of microwave mobile communication. Microwave dielectric ceramics are mainly used as microwave components such as resonators, filters, dielectric antennas and dielectric guided wave circuits. It can be used in mobile communication, satellite communication and military radar. With the rapid development of science and technology, the rapid increase of communication information and people's requirements for wireless communication, it has become an inevitable trend to use microwave communication systems such as satellite communication and satellite live television. This makes the demand for microwave materials in the civil field gradually increase, such as mobile phones, car phones, cellular cordless phones and other new application equipment such as satellite direct broadcast TV. Take the mobile phone as an example. In 2004, the annual sales volume of mobile phones in China was 64 million, and the mobile phone market in China will grow at a rate of 20% every year. In two or three years, the sales volume will reach 654.38+billion. It can be seen that microwave dielectric ceramics have great development space and market in commercial application. Compared with metal cavity resonator, microwave dielectric resonator has the following advantages: (l) miniaturization (high dielectric constant r). As we all know, the way to realize miniaturization, high stability and low cost of microwave equipment is the integration of microwave circuits. In the process of microwave circuit integration, metal waveguide realizes planar microstrip integration and microwave tube realizes miniaturization. However, various metal resonant cavities in microwave circuits are bulky and heavy, so it is difficult to integrate with microstrip circuits. The way to solve this difficulty lies in making resonators with microwave dielectric ceramic materials. As we all know, 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 required dielectric ceramic block and the smaller the size of the resonator. Therefore, the high dielectric constant of microwave dielectric ceramics is beneficial to the miniaturization of microwave dielectric filters, which can make the filter, microwave tube and microstrip line realize the hybrid integration of microwave circuits, and make the device size reach millimeter level, and its price is much lower than that of metal resonant cavity. General requirements > 1O .(2) high stability (frequency temperature coefficient f is close to zero). The working environment temperature of communication equipment cannot be constant. If the resonant frequency of microwave dielectric material changes greatly with temperature, the carrier signal of the filter will drift at different temperatures, thus affecting the performance of the equipment. This requires that the resonant frequency of materials should not change too much with temperature. The actual temperature requirement range is roughly -40℃-+ 100℃, and within this range, the frequency temperature coefficient f of the material is not greater than l0ppm/℃. At present, the frequency temperature coefficient of practical microwave dielectric ceramic materials can reach 0 ppm/℃, thus achieving high stability and reliability of devices. (3) Low loss (high quality factor Q). An important requirement of filters is low insertion loss, and the dielectric loss of microwave dielectric materials is the main factor affecting the insertion loss of dielectric filters. Q value of microwave dielectric material is inversely proportional to dielectric loss. The larger the q value, the lower the insertion loss of the filter. At present, microwave dielectric ceramics have been widely used to manufacture microwave dielectric filters and resonators in portable mobile phones, car phones, cordless phones, TV satellite receivers and military radars, and are playing an increasingly important role in the miniaturization and integration of modern communication tools. Patent technology set of dielectric ceramics 1. Dielectric material of base metal electrode multilayer ceramic capacitor and its preparation method II. Surface modification method of PTFE ceramic composite dielectric material III. Microwave dielectric ceramics with high dielectric constant and low loss 4. Microwave dielectric ceramics with high dielectric constant and its preparation method. Microwave dielectric ceramics with high dielectric constant 6. Low loss microwave dielectric ceramics 7. Microwave dielectric ceramics with high dielectric constant 8. Low-loss microwave dielectric ceramic 9, dielectric of microwave multilayer ceramic capacitor and its manufacturing method 10, low-dielectric microwave dielectric material for medium-temperature sintered multilayer ceramic capacitor 1 1, mixed multiphase dielectric ceramic material for high frequency 12, lead-based microwave dielectric ceramic and its manufacturing method 13, ceramic dielectric filter/3. 4. Microwave dielectric ceramics 15, porcelain glaze coated on ceramic filter media to resist aluminum melt corrosion 16, High-voltage ceramic capacitor dielectric for microwave oven magnetron 17, microwave dielectric ceramic and its preparation method 2 18, high-frequency dielectric ceramic composition and preparation process 19, high-voltage ceramic capacitor dielectric 20, high-quality microwave ceramic dielectric and its preparation method 2 1, ceramic dielectric material with high dielectric constant, high stability and low loss and its preparation method 22, Light foam ceramic dielectric ball and its preparation method 23, perovskite-like microwave dielectric ceramics with near-zero frequency temperature coefficient and its preparation method 24, high-performance low-temperature sintered high-frequency point dielectric ceramics 25, high-voltage ceramic capacitor dielectric preparation method 26, a method for preparing microwave dielectric ceramics with high dielectric constant 27, 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coefficient, dielectric ceramic composition, capacitor using the composition and its preparation method 76, multilayer ceramic dielectric filter 77, dielectric ceramic composition, capacitor using the composition and its preparation method 278, dielectric ceramic powder and its preparation method and composite dielectric material 79, low-temperature sinterable dielectric ceramic composition, Multilayer ceramic chip capacitor and ceramic electronic device 80, dielectric ceramic composition and monolithic ceramic capacitor 8 1, dielectric ceramic powder mixture 82 containing barium lithium borosilicate flux and magnesium zinc titanate powder, transition metal glass ceramic gain medium 83, nano ceramic material dopant, high dielectric reactance reducing multilayer ceramic capacitor dielectric material and its preparation method 84, Glass-ceramic substrate for information storage medium and its preparation method and information storage medium disk 85, dielectric ceramic composition and 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