(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.
(Color online) Phase shift vs applied voltage for selected frequencies in the device filled with W-1825 mixture.
(Color online) Group delay vs frequency for several bias voltages. The wiggles are caused by reflections at the end of the device.
(Color online) Change in group delay vs bias voltage for several frequencies.
(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.
(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.
Properties of mixture W-1825 at 20 °C.
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