Zirconium dioxide mixed modified barium strontium phthalate-magnesium oxide base composite and preparation process thereof

Abstract

The invention relates to a zirconium dioxide doping modifying barium strontium titanate-MgO based (Ba1-xSrxTiO3 / MgO) compounding material and the manufacture method. The basal body is barium strontium titanate and MgO. Trace quantity of zirconium dioxide is doped in to modify. The constitutes are (1-y)Ba1-xSrxTiO3+yMgO+zZrO 2, of which 0.35<=x<=0.45, y=50wt%, Owt%1-xSrxTiO3(BSTO) powder from BaCO3, SrCO3, and TiO2; mixing the powder with MgO and ZrO2 to make compounding material. The result shows zirconium dioxide doping sharply increases the adjustability of dielectric constant, and has low dielectric constant, low microwave consumption, etc.

Description

technical field [0001] The invention relates to a zirconium dioxide-doped modified strontium barium titanate-magnesia-based composite material and a preparation method thereof, belonging to the technical field of electro-optical materials, and in particular to a class of materials for phased array phase shifters. Background technique [0002] The phase shifter is the core component of phased array radar. The materials currently used as phase shifters are mainly ferrite and PIN diodes, but they have some major disadvantages, such as: ferrite phase shifters (1) have high peak power consumption and limited transmission speed; (2) The temperature compensation circuit inevitably causes the pointing error of the phased array antenna; (3) the control circuit and the compensation circuit not only make the phase shifter itself bulky, but also lead to a decrease in the reliability of the phased array antenna; (4) the manufacturing process is complicated, and the production cost highe...

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Problems solved by technology

[0015] The ferroelectric material (also known as electro-optic material) used in phase shifters is the most researched ferroelectric material (BSTO) material. It was first published by Richard W. Babbitt et al. in the "Microwave Journal" magazine in June 1992 It was proposed in an article titled "Planar Microwave Electro-Optic Phase Shifter" published in . However, due to the high dielectric constant and high microwave loss of BSTO materials, the material needs to be further optimized to meet the requirements of phase shifters. After the application requirements of the US Army Laboratory Louise et al., the ferroelectric composite material obtained by combining BSTO and certain metal oxides greatly improved the performance of the material. For example, the BSTO-Al described in US Patent No.5,312,790 2 o 3 Composite material, BSTO-ZrO as described in U.S. Patent No. 5,486,491 2 Composite materials, BSTO-ZnO composite materials described in U.S. Patent No. 5,635,433, etc. Among them, the BSTO-MgO composite materials described in U.S. Patent No. 5,645,434 have the best performance, low dielectric constant and microwave loss. In On this basis, Chiu et al. modified the BSTO-MgO composite material with rare earth elements, and the results were published in US Patent No. 6,074,971. However, the adjustability of the current material is still relatively low, such as in US Patent No. 6,074,971 Described Ba 0.55 Sr 0.45 TiO 3 -MgO composite material is only 6.57% under the electric field of 2V / μm, and the tunability of the composite material added with rare earth elements is not more than 8%, which requires further modification of the material to improve its tunability. The same BSTO-Mg proposed by Chiu et al. 2 SiO 4 The material greatly improves the dielectric constant tunability of the material, which has been published in US Patent No. 6,514,895B1, but the dielectric constant and microwave dielectric loss of the material also increase. At 10GHz, the microwave loss of the material >0.02, so it is necessary to further explore the material to optimize the material performance

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