Microwave dielectric ceramic material for 5G base station and preparation method thereof

Abstract

The invention discloses a microwave dielectric ceramic material for a 5G base station and a preparation method of the microwave dielectric ceramic material. The general composition formula of the ceramic material is Ca<1-x>La<x>Ti<1-y> Al<y>O<3> + a wt% of Mg<2>Al<4>Si<5>O<18> + b wt% of Nb<2>O<5> + c wt% of ZrO<2> + d wt% of MnO, wherein x and y are molar content proportions, x is more than or equal to 0.2 and less than or equal to 0.4, y is more than or equal to 0.2 and less than or equal to 0.4, a, b, c and d are mass percent contents on the basis of Ca<1-x>La<x>Ti<1-y> Al<y>O<3>, a is more than or equal to 0.01 and less than or equal to 7, b is more than or equal to 0.001 and less than or equal to 2, c is more than or equal to 0.001 and less than or equal to 5, and d is more than or equal to 0.001 and less than or equal to 0.5. The preparation method comprises the following steps: burdening, ball milling, drying, pre-sintering, secondary ball milling, granulating, forming and sintering. The microwave dielectric ceramic material provided by the invention shows relatively excellent performance; particularly, thermal shock resistance is greatly improved, and a thermal shock temperature difference reaches 100 DEG C or above; meanwhile, a relative dielectric constant epsilon r is adjustable between 40 and 50, the value of Q*f reaches 40000 or above, and the temperature coefficient tau f of resonance frequency is adjustable between -10 ppm / DEG C to +10 ppm / DEG C. The preparation process is simple, the performance of the material is stable, reliability is high, and actual use requirements on a microwave medium for the 5G base station are met.

Description

technical field [0001] The invention belongs to the technical field of electronic information functional materials and devices, in particular to a microwave dielectric ceramic material for 5G base stations and a preparation method thereof. Background technique [0002] In the 5G era, the information interaction mode of human society is further upgraded, and the types of business applications supported by mobile communication networks are more diverse, and a variety of high-capacity and high-speed applications burst forth, which puts forward higher requirements for the capacity, speed and service capabilities of mobile networks . Micro base stations, active smart antennas and other miniaturized devices with high integration, strong data carrying capacity, and flexible and intelligent layout have become important hardware guarantees for the smooth operation of 5G networks and the smooth application of Internet of Things and cloud technologies. As the main core components of m...

AI Technical Summary

Problems solved by technology

But the Nd of one of the raw materials used in this system 2 o 3 The high price (more than 500 yuan / kg), resulting in CaTiO 3 -NdAlO 3 The cost of the system has been high, which limits its wide-scale use in the civilian field

In addition, in actual base station applications, its peak temperature can even reach 110-120°C, and in some high-latitude regions, the ambient temperature may be lower than -30°C, so the microwave medium will go through the heating-cooling process repeatedly, and the ceramic itself Its brittleness, its resistance to rapid temperature rise and fall is poor, that is, its thermal shock resistance is poor, and the device cracks, resulting in failure, and even the dielectric ceramic collapses causing devastating damage to the device.

At present, microwave dielectric ceramic materials are trying their best to pursue high quality factor and stable frequency and temperature characteristics, ignoring the reliability of materials and devices under thermal shock conditions.

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