Phase distribution analysis of reflectarrays based on isotropic and anisotropic substrate materials

Dahri, Muhammad Hashim and Ismail, Muhammad Yusof (2011) Phase distribution analysis of reflectarrays based on isotropic and anisotropic substrate materials. In: Malaysian Technical Universities International Conference on Engineering and Technology (MUiCET 2011), 13-15 November 2011, Batu Pahat, Johor.

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Abstract

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.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:anisotropic; dielectric anisotropy; dynamic phase range; figure of merit; isotropic; reflectarray; reflection loss; resonant frequency
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics
Divisions:Faculty of Electrical and Electronic Engineering > Department of Communication Engineering
ID Code:6049
Deposited By:Normajihan Abd. Rahman
Deposited On:01 Apr 2015 13:53
Last Modified:01 Apr 2015 13:53

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