Environment friendly ka band microwave dielectric ceramic

Abstract

The invention relates to an environmental protective microwave medium ceramic used in the Ka wave band of the microwave components such as a medium resonator, a filter, an oscillator etc. which are applied to a Ka wave band satellite communication system. The invention contains the components of 76.5 percent to 80.5 percent of Nd2O3, 9.1 percent to 9.8 percent of ZnO, 9 percent to 9.7 percent of TiO2, 0 percent to 3.8 percent of Co2O3, 0.1 percent to 0.2 percent of La2O3, 0 percent to 0.5 percent of CuO, 0 percent to 0.5 percent of Sm2O3 etc. The components are treated for the solid phase reaction working procedures such as weighing, mixing for ball milling, calcining, crushing, granulating, molding, sintering etc. to be fired as the microwave medium ceramic. The invention has the characteristics of reducing the sintering temperature for saving energy, the middling dielectric constant, the high quality factor and the stable resonance frequency temperature.

Description

technical field [0001] The invention relates to an environment-friendly microwave dielectric ceramic for Ka-band used in microwave components such as dielectric resonators, filters and oscillators in Ka-band satellite communication systems. Background technique [0002] At present, the rapid development of the satellite TV industry has sharply increased the demand for tuners, one of the indispensable components in satellite TV receiving equipment. This demand also greatly drives the demand for related microwave components such as microwave resonators, filters, oscillators, and microwave capacitors. Satellite broadcasting and television usually use C, Ku and Kα frequency bands. According to the explanation of the microwave sub-band codes currently used in my country in "Basics of Microwave Technology" (Xidian, Liao Chengen), the frequency range of Ka band is roughly 27~ 40GHz. Therefore, it is required to have the following three properties in the Ka-band frequency band (270...

AI Technical Summary

Problems solved by technology

[0004] (2) The quality factor (Q) is large: when the microwave passes through the dielectric, the energy will be lost, and the dielectric loss is represented by tanδ

[0006] Development of materials satisfying these conditions is currently underway, but in practice, the development of materials with all three conditions is quite difficult

Because the Q of the existing technology is less than 3000 in the ka band, the temperature coefficient of the resonant frequency is too large ± 10ppm or more, which does not meet the performance requirements of the Ka band

[0007] In 2006, the American Ceramic Society Journal Volume 89, Issue 4, published the Nd(Zn 1 / 2 Ti 1 / 2 )O 3 A paper on materials, expounding that the ceramic prepared by changing the formula is a microwave dielectric ceramic with excellent performance, but its sintering temperature is higher than 1330°C, and the temperature coefficient is greater than -40ppm / °C, which is not suitable for satellite communication. used in the band