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    • 2. 发明申请
    • PREPARATION METHOD OF HIGH PERMEABILITY NI-ZN FERRITE AND AN ANTENNA USING THE SAME
    • 高渗透性的制备方法NI-ZN FERRITE和使用其的天线
    • WO2009145522A3
    • 2010-02-25
    • PCT/KR2009002691
    • 2009-05-22
    • EMW ANTENNA CO LTDRYUN BYUNG HOONSUNG WON MOAHN WON KI
    • RYUN BYUNG HOONSUNG WON MOAHN WON KI
    • C01G49/02
    • C01G49/0063C01G49/0018C01G53/006C01P2006/42
    • An object of the present invention is to provide a preparation method of a Ni-Zn ferrite having a ratio of permeability/permittivity of not less than 2 in a band of radio frequencies of several MHz and a value of permeability loss of below 0.2, and in particular, a preparation method of a Ni-Zn ferrite that can be used as a material for antenna substrates, make it possible to obtain smaller antennas and achieve high gain compared with comparable high permittivity materials, and an antenna using the same. To achieve this, the present invention provides a preparation method of a high-permeability Ni-Zn ferrite, comprising the steps of: (A) mixing cobalt chloride, zinc chloride and iron chloride; (B) coprecipitating the mixed solution obtained in step (A) with sodium hydroxide to form a metal hydroxide slurry; (C) rinsing the coprecipitated metal hydroxide slurry with distilled water; (D) drying the rinsed metal hydroxide slurry; (E) primarily pyrolyzing the dried metal hydroxide; and (F) performing secondary pyrolysis following the primary pyrolysis.
    • 本发明的目的是提供一种在几MHz的射频频带和磁导损失值小于0.2的磁导率/介电常数不小于2的Ni-Zn铁氧体的制备方法,以及 特别是可以用作天线基板材料的Ni-Zn铁氧体的制备方法,与可比较的高介电常数材料相比,可以获得更小的天线并实现高增益,以及使用该天线基板的天线。 为了达到此目的,本发明提供了一种高磁导率Ni-Zn铁氧体的制备方法,包括以下步骤:(A)混合氯化钴,氯化锌和氯化铁; (B)用氢氧化钠共沉淀步骤(A)中得到的混合溶液,形成金属氢氧化物浆料; (C)用蒸馏水冲洗共沉淀的金属氢氧化物浆液; (D)干燥漂洗后的金属氢氧化物浆料; (E)主要热解干燥的金属氢氧化物; 和(F)在主要热解之后进行二次热解。