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Smith-chart diagnostics for multi-GHz time-domain-reflectometry dielectric spectroscopy
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10.1063/1.3685248
/content/aip/journal/rsi/83/2/10.1063/1.3685248
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/2/10.1063/1.3685248
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Segmented transient acquisition for test liquids with 3.5-mm flat termination (four of 12 segments shown).

Image of FIG. 2.
FIG. 2.

TDR Smith charts for (a) increasing sample permittivity/loss (b) increasing sample conductivity. Frequency markers are shown in GHz.

Image of FIG. 3.
FIG. 3.

TDR Smith charts compared with (a) VNA measurement and (b) HFSS simulation. Frequency markers are shown in GHz.

Image of FIG. 4.
FIG. 4.

TDR sensors for (a) 3.5-mm pin termination and (b) 9-mm flat termination.

Image of FIG. 5.
FIG. 5.

Effect of sample boundary reflections and castle-nut shield on (a) Smith chart showing ∼1 GHz resonance, (b) direct transient showing ∼1 ns signal difference with sensor repositioning and its removal after introduction of the castle nut shield.

Image of FIG. 6.
FIG. 6.

Effect of varying pin length for 3.5-mm sensor and comparison with HFSS simulation for (a) 0.0-mm pin, (b) 0.4-mm pin, (c) and 1.0-mm pin. (d) Variation in TDR traces for water and correction to absolute reflection coefficient.

Image of FIG. 7.
FIG. 7.

Effect of pin length and castle-nut shield on bilinear parameters (a) B, (b) 1 / |1-Bρ|, and calibrated permittivity (c) ɛ and d) ɛ (3.5-mm sensor in 40% water/acetone solution).

Image of FIG. 8.
FIG. 8.

Effect of terminating plug thickness and castle-nut shield on 9-mm flat termination in water. (a) 6.3 vs. 2.5-mm plug without castle-nut shield, (b) 6.3-mm plug with/without castle-nut shield, (c) 2.5-mm plug without castle-nut shield compared with VNA, (d) 6.3-mm plug without castle-nut shield compared with VNA, and (e) 6.3-mm plug with castle-nut shield compared with VNA.

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/content/aip/journal/rsi/83/2/10.1063/1.3685248
2012-02-13
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Smith-chart diagnostics for multi-GHz time-domain-reflectometry dielectric spectroscopy
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/2/10.1063/1.3685248
10.1063/1.3685248
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