Wideband Measurement System of ΔHω using All Shielded Shorted Microstrip Line
Wideband Measurement System of ΔHω using All Shielded Shorted Microstrip Line
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采用全屏蔽短接微带线的宽带ΔHω测量系统
DOI：
10.3379/msjmag.0903rf8034
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发表时间：
2009
影响因子：
--
通讯作者：
H. Suzuki
中科院分区：
文献类型：
--
作者：
S. Takeda;H. Suzuki
提出了微波铁氧体FMR（铁磁共振）线宽ΔHω宽带测量系统。在该系统中，使用全屏蔽短路微带线作为测试夹具，并将样本插入靠近短路端的位置。在恒定的外磁场下，通过监测夹具的S11和VNA（矢量网络分析仪）的扫频来观察FMR的吸收曲线。根据这些数据，基于集总元件电路模型导出复磁导率虚部μ”变为谐振时最大值一半的频率宽度Δω，并通过ΔH[Oe]=Δω[MHz]/2.8计算ΔH。由于该ΔH与传统ΔH不同，因此将其指定为ΔHω。5mm方形石榴石板的ΔHω宽带测量结果从0.7[GHz]到据报道，仅使用一个测试夹具即可达到 11[GHz]。
The wideband measurement system of ΔHω, FMR (ferromagnetic resonance) line width of microwave ferrite, is proposed. In this system, an all shielded shorted microstrip line is used as a test fixture and a specimen is inserted close to the short end. The absorption curve of FMR is observed by monitoring S11 of fixture and sweeping frequency in VNA (vector network analyzer) under constant external magnetic field. From these data, the frequency width Δω, at which an imaginary part μ” of complex permeability becomes half of maximum at resonance, is derived based on lumped element circuit model and ΔH is calculated by ΔH[Oe]=Δω[MHz]/2.8. As this ΔH is different from conventional ΔH, this is designated ΔHω. The wideband measurement result of ΔHω for 5mm square garnet slab over from 0.7[GHz] to 11[GHz] using just one test fixture is reported.