Phase distribution analysis of reflectarrays based on isotropic and anisotropic substrate materials
Reflectarray antennas provide a low cost and low profile way for different type of applications, but their use is limited particularly in satellite and earth observatory systems, due to limited phase ranges and high reflection loss performance. In this paper an X band rectangular patch reflectarray...
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| Main Authors: | , |
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| Format: | Conference or Workshop Item |
| Published: |
2011
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/6049/ http://eprints.uthm.edu.my/6049/1/Phase_Distribution_Analysis_of_Reflectarrays.pdf |
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| Summary: | Reflectarray antennas provide a low cost and low profile way for different type of applications, but their use is
limited particularly in satellite and earth observatory systems, due to limited phase ranges and high reflection loss
performance. In this paper an X band rectangular patch reflectarray constructed on lmm thick isotropic and
anisotropic substrates is proposed to be employed as a dynamic phase control strategy for terrestrial systems. A
number of isotropic and anisotropic materials, including liquid crystals, have been used to investigate the
tunability capability of reflectarray antenna design. A detailed analysis of reflection losses, static and dynamic
phase ranges with respect to dielectric constant and dielectric anisotropy are presented for different substrate
materials. The preliminary analysis resillts demonstrate that Teflon and Polystyrene are observed to offer
minimum reflection losses of 0.026dB and 0.0159dB for isotropic and anisotropic materials respectively
compared to Silicon and Zircon which generate wider static and dynamic phase ranges of 215" and 315" and a
minimum figure of merit (FoM) value of 0.14"/MHz and a maximum dielectric anisotropy of 3.4 respectively.
-Moreover it is also shown that an increase in dielectric anisotropy can also rise the dynamic phase and resonant
frequency ranges. The dielectric isotropic and anisotropic properties of materials presented in this work are
shown to considerably affect the reflection loss and phase range of reflectarray antenna performance particularly
for rapid dynamic phase change of satellite and earth observatory systems. |
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