Characterization of material properties for tunable reflectarray antenna design
The emerging field of communications has increased the demand of electronically tunable reflectarray antennas. Substrate material properties play at1 important role in the design of reflectamy antennas. Variable permittivity materials such as liquid crystals and fenoelectrics have received great dea...
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| வெளியீடபà¯à®ªà®Ÿà¯à®Ÿà®¤à¯: |
American Institute of Physics
2013
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| பகà¯à®¤à®¿à®•à®³à¯: | |
| நிகழà¯à®¨à®¿à®²à¯ˆ அணà¯à®•à®²à¯: | http://link.aip.org/link/doi/10.1063/1.4803601 http://link.aip.org/link/doi/10.1063/1.4803601 http://eprints.uthm.edu.my/3958/1/muhammad_yusof_ramli_U.pdf |
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| தொகà¯à®ªà¯à®ªà¯: | The emerging field of communications has increased the demand of electronically tunable reflectarray
antennas. Substrate material properties play at1 important role in the design of reflectamy antennas. Variable permittivity
materials such as liquid crystals and fenoelectrics have received great deal of attention due to their non-linear material
properties. A comparative analysis behveen the properties of liquid crystals and ferroelectrics for tunable reflectarray
antenna design has been carried out by using Finite Integral Method (FIM). A thorough investigation based on
reflectarray design analysis and tunable bias voltages of different non-linear materials is provided. It has been shown that
due to higher dielectric permittivity values of non-linear materials, fenoelectrics require higher bias voltages for
electronic tunability, as compared to liquid crystal materials. Barium skontium titanate (BST) with a dielectric
permittivity ranging from 300 to 360 has been used as a fenoelectric substrate material to design a rectangular patch
reflectarray which offers a frequency tunability of 3 GHz. The results show that ferroelectrics are only applicable for high
frequency reflectarray operation due to materials' higher permittivity values. Furthermore a rectangular patch reflectarmy
antenna printed on 1 mm thick different liquid crystal materials has also been designed based on FIM. It has been shown
that as the dielectric anisotropy of substrate material increases from 0.17 to 0.45, the frequency tunablity and dynamic
phase range of reflectarray antenna also increase from 372 MHz to 795 MHz and 90' to 1 609, respectively. |
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