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Material Measurement of TT2-111R

Material Measurement of TT2-111R. Measurements provided by TT. Material Measurement of TT2-111R. This ferrite is readily available in tiles of 6 cm x 6 cm and 5 mm thickness; Material samples are “wrapped” around an inner conductor; this allows a non-destructive measurement,

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Material Measurement of TT2-111R

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  1. Material Measurement of TT2-111R Measurements provided by TT Christine Vollinger & Fritz Caspers

  2. Material Measurement ofTT2-111R • This ferrite is readily available in tiles of 6 cm x 6 cm and 5 mm thickness; • Material samples are “wrapped” around an inner conductor; • this allows a non-destructive measurement, • without any machining of the ferrite. Christine Vollinger & Fritz Caspers

  3. Material Measurement of TT2-111R Side walls made of Plexiglas to allow “wave leakage”(no unwanted HO modes). SH-sample holder It is much simpler to machine metal than ceramics with adequate accuracy… Embedded conductor (brass) Christine Vollinger & Fritz Caspers

  4. TT2-111R, Reverse Calculation of S21 TT2-111R, Measurement of S21 Christine Vollinger & Fritz Caspers

  5. Material Measurement of TT2-111R /S-Params Red= Measurement in SH-sample holder Blue= Reverse Calculation from TT-data; We can’t really say which numbers are “more correct”… Christine Vollinger & Fritz Caspers

  6. Material Measurement of TT2-111R /Permeability Red= Measurement in SH-sample holder; Blue= Measurement provided by TT. Christine Vollinger & Fritz Caspers

  7. Material Measurement of TT2-111R /Permeability TT Data Meas. w.short TT Data Meas. w. short • Additional measurement with SH-sample holder terminated with SHORT • Permeability calculated from input impedance: z1=jZL tan(βl) -> valid for low frequencies, only (up to about λ/4) ! • Method with SHORT termination is also limited for absorbing materials due to the material damping. Christine Vollinger & Fritz Caspers

  8. Material Measurement of TT2-111R Conclusion • A transmission measurement is used for the measurement of material parameters of ferrite samples; • Material samples are “wrapped” around an inner conductor; • this allows a non-destructive measurement, • without any machining of the ferrite. • Measurement for frequencies < 1 GHz show a limited sensitivity to air gaps in the samples, this is advantageous; • For measuring above approx. 1 GHz, smaller sample lengths would be required (we already reach -80 dB at 1 GHz). • Influence of an air gap can be tested as it is possible to measure with defined air gaps. • This method is used as it is much simpler to machine metal thanceramics with adequate precision. Christine Vollinger & Fritz Caspers

  9. Material Measurement of TT2-111R /Permeability Red= Measurement in SH-sample holder; Blue= Measurement provided by TT. Christine Vollinger & Fritz Caspers

  10. Cross-check: comparison of measurement of empty SH-sample holder with calculated S-parameters Christine Vollinger & Fritz Caspers

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