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首页> 外文会议>The 10th International Conference on Ferrites（2008中国国际铁氧体研讨会）论文集 >Non-linearity in the Microwave Ferrite Material
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Non-linearity in the Microwave Ferrite Material

机译：微波铁氧体材料中的非线性

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As the ferrite material is used in the field of communication it will appear the second class nonlinear effect, because here exist two adjacent and different frequency signal f1,f2 same-time, so, not only there are double-frequency effect(DFE), but also mixture-frequency effect(MFE), which will induce 3-order inter-modulation(3-1MD) signal 2f1-f2and 2f2-f1. These are the kinds of interference signals to f1,f2, it harm to communication quality. Therefore, it is important to study 3-IMD problem for ferrite applied and how to decrease 3-1MD level. First of all, we shall initiate discussion from magnetization vector procession equation,and in the condition of two greater signal f1,f2, nonlinear effect (NLE) will appear in ferrite material, and to obtain basic formula of the 3-IMD, and then to research IMD mechanism and to overcome it's method. The 3-IMD is also by 3-IMD basic formula through two examples: at the band 869-960MHz and 1805-1880MHz,when operating magnetic field is greater then that in which ferromagnetic resonance occurs, as well as it's relationship to field-magnetized. Secondly, the circulator' 3-IMD can be calculated by high frequency structure simulation (HFSS) and in combination with numerical integral method. Calculating results point out that the circulator is relative to ferrite material parameter, inner conductor shape/size, and bias magnetic field strength,and two kinds of inner conductor structure with lower 3-IMD operated above two band. At last, the statistical results of two kinds of products with lower 3-IMD are listed and the measure circuit of 3-IMD-measuring is set up.
机译：由于铁氧体材料用于通信领域，将出现第二类非线性效应，因为此处同时存在两个相邻且不同频率的信号f1，f2，因此，不仅存在双频效应（DFE），而且还有混合频率效应（MFE），它将引起3阶互调（3-1MD）信号2f1-f2和2f2-f1。这些是对f1，f2的干扰信号，会损害通信质量。因此，研究应用铁氧体的3-IMD问题以及如何降低3-1MD水平具有重要意义。首先，我们将从磁化矢量过程方程开始讨论，在两个更大的信号f1，f2的条件下，铁素体材料中将出现非线性效应（NLE），并获得3-IMD的基本公式，然后研究IMD的机理并克服它的方法。 3-IMD也是3-IMD基本公式的两个示例：在869-960MHz和1805-1880MHz频段，当工作磁场大于发生铁磁谐振的磁场时，以及与磁场磁化的关系。其次，可以通过高频结构仿真（HFSS）并结合数值积分方法来计算循环器的3-IMD。计算结果表明，环行器与铁氧体材料参数，内部导体的形状/尺寸和偏置磁场强度有关，并且两种具有较低3-IMD的内部导体结构在两个频带以上工作。最后，列出了两种3-IMD值较低的产品的统计结果，并建立了3-IMD测量的测量电路。

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