Wideband Measurement System of ΔH_ω using All Shielded Shorted Microstrip Line
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概要
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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.
- 2009-05-01
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