A kind of nickel-zinc ferrite material for wireless signal sensing, sheet magnetic core and preparation method thereof

Abstract

The invention relates to a nickel-zinc ferrite material for wireless signal sensing, a sheet core and a preparation method thereof. The nickel-zinc ferrite material comprises main components which are calculated by the following oxides in mole percent: 48.0-62.5mol% of Fe2O3, 15.3-25.5mol% of NiO, 18.5-23.5mol% of ZnO and 3-10mol% of CuO; and the nickel-zinc ferrite material additionally comprises auxiliary components which are calculated by the following standard substances in weight percent relative to the total weight of the main components: 0.05-0.10wt% of nano CaCO3, 0.30-0.85wt% of nano SiO2, 1.50-2.50wt% of Mn3O4, 0.05-0.35wt% of Co2O3 and 1.00-1.50wt% of Bi2O3. The nickel-zinc ferrite material is prepared by adopting an oxidation method. The sheet core is a reticular sheet, the length is 45-250mm, the width is 45-250mm, the thickness is 0.05-0.3mm, the sheet core is formed by small sheets in a connecting way, the gaps among the small sheets are less than 50mum, and the sheet core is directly molded and then is sintered, or a magnetic bar is molded and then is sliced into small sheets which form the sheet core through an SMT (surface mount device) technology. At frequency of 13.56MHz, the material has the electromagnetic performance that mu' is equal to 125 plus or minus 20% and the mu'' is less than or equal to 4. Therefore, the material can satisfy the requirement of high-frequency low consumption on the ferrite material for wireless signal sensing.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic ferrite, and in particular relates to a nickel-zinc ferrite material for wireless signal sensing and a sheet magnetic core thereof, and also relates to a preparation method of the nickel-zinc ferrite material and a sheet magnetic core thereof. Background technique [0002] Nickel-zinc ferrite has the characteristics of high resistivity and high frequency of use, making it widely used in fields such as anti-electromagnetic interference, SMD (surface mount devices), MLCI (multiplayer chop inductors), electronic transformers, and high-power synthesizers. ,Market prospects. [0003] With the development of devices towards higher frequencies, higher requirements are put forward for the performance of nickel-zinc soft ferrite. When power inductors are used at high frequencies, especially at 10MHz to 20MHz, the performance of the device is often deteriorated due to the high μ" value, large loss, a...

AI Technical Summary

Problems solved by technology

However, the working frequency of the wireless signal sensing antenna module is generally 13.56MHz. When the module is installed in electronic equipment and works near metal, the resonant frequency of the antenna will change, resulting in poor communication or even communication interruption.

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