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Liquid crystal phase shifters at millimeter wave frequencies
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10.1063/1.3691202
/content/aip/journal/jap/111/5/10.1063/1.3691202
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/5/10.1063/1.3691202

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Cross section of the device structure. The polyimide layer is rubbed and causes the in-plane orientation of the liquid crystal molecules when there is no voltage.

Image of FIG. 2.
FIG. 2.

(Color online) Phase shift vs applied voltage for selected frequencies in the device filled with W-1825 mixture.

Image of FIG. 3.
FIG. 3.

(Color online) Group delay vs frequency for several bias voltages. The wiggles are caused by reflections at the end of the device.

Image of FIG. 4.
FIG. 4.

(Color online) Change in group delay vs bias voltage for several frequencies.

Image of FIG. 5.
FIG. 5.

(Color online) S 21 parameter as a function of frequency. The results show the difference in transmission for coplanar waveguides without and with a liquid crystal material for lines 3.2 and 6.6 mm long.

Image of FIG. 6.
FIG. 6.

(Color online) Phase shift as a function of voltage for different frequencies in a cell constructed with rubbed Cu instead of polyimide. The different lines represent measurements from 10 to 110 GHz in steps of 10 GHz.

Tables

Generic image for table
Table I.

Properties of mixture W-1825 at 20 °C.

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/content/aip/journal/jap/111/5/10.1063/1.3691202
2012-03-02
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Liquid crystal phase shifters at millimeter wave frequencies
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/5/10.1063/1.3691202
10.1063/1.3691202
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