Super low-loss and small-line width microwave ferrite material and preparation method for microwave ferrite material

Abstract

The invention relates to a super low-loss and small-line width microwave ferrite material and a preparation method for the microwave ferrite material and belongs to the field of microwave communication and magnetic materials. The main phase of the material is of a johnstonotite structure, and the chemical formula of the material is Y3-2x-yCa2x+yFe5-x-y-zVxZryAlzO12, wherein x is not less than 0.02 but is not more than 0.25, y is not less than 0.05 but is not more than 0.25, and z is not less than 0.01 but is not more than 0.25. The preparation method comprises the following steps of: calculating according to chemometry and weighing a raw material, vibratory milling, presintering, vibratory grinding and coarse crushing, sanding fine crushing, spray granulation, compression moulding and sintering. Proved by testing, the ferromagnetic resonance line width deltaH of the obtained material is not more than 1.27KA / m, the dielectric loss tgdeltae is not more than 0.5*10-4, and the insertion loss of an assembled microwave device is not more than 0.21dB, and thereby, the stability and the reliability of the obtained material are greatly enhanced, and the application range is broadened. The manufactured microwave ferrite device has the advantages of wide working band and low insertion loss.

Description

technical field [0001] The invention relates to a microwave ferrite material with ultra-low loss and small line width and a preparation method thereof, belonging to the fields of microwave communication and magnetic materials. Background technique [0002] The middle-level isolation of the electronic system, the prevention of crosstalk, impedance matching, and broadband are all completed by small, lightweight, and integrated microwave ferrite circulators / isolators, so as to achieve the purpose of protecting the system and improving its stability and reliability. , is an indispensable basic device in microwave communication, microwave energy application, medical treatment, microwave measurement technology, satellite communication, etc. Among them, the microwave ferrite material plays a key role in the device. With the rapid development of electronic technology, new requirements are put forward for devices using microwave ferrite, and higher requirements are also put forward f...

AI Technical Summary

Problems solved by technology

For the current market demand, the resonance line width △H and dielectric loss tgδe of the microwave ferrite prepared by the above patents are still insufficient

In addition, the chemical formula of garnet ferrite disclosed in the patent CN 101591168A is: Y3-2xCa2xVxIny MnzFe5-x-y-zO12 or Y3-xCax GexInyMnzFe5-x-y-zO12, although the tested ferromagnetic resonance linewidth △H is 1.2KA / m, the insertion loss is 0.25dB, which meets the requirements of the device, and under the lower saturation magnetization of the US patent US 4125473, the ferromagnetic resonance linewidth can reach 1.75 KA / m, the dielectric loss is less than 1×10-4, all use In2O3 and Ge which are very expensive in the market 2O3 two raw materials, the cost is high, which is not conducive to production