Abstract
The effective dielectric constant of the top grounded coplanar waveguide with a liquid crystal (LC) superstrate for phase shifting applications is investigated in the frequency range of 30-60 GHz. Two nematic LC mixtures, namely E7 and MDA-00-3506, are used as the superstrate. The measurements show that MDA-00-3506 offers higher values of phase shift per millimeter than its E7 counterpart. In particular, the MDA-00-3506 provides 3.14°/mm, whereas E7 gives 2.79°/mm at 60 GHz. The results of the dielectric constants from measurement and computer modeling are found to agree to within 5%. For the modeling, a comprehensive finite element package predicting the local alignment of LC molecules and effective dielectric constant at different bias voltages and frequencies are used.
| Original language | English |
|---|---|
| Pages (from-to) | 1416-1418 |
| Number of pages | 3 |
| Journal | Microwave and Optical Technology Letters |
| Volume | 55 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Jun 2013 |
| Externally published | Yes |
Keywords
- CPW
- finite element method
- liquid crystal
- mm-wave devices
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