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Analysis of an High-Gain Antenna with FSS Superstrate : Effective Medium Approach
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- Authors
- Dong Ho Kim, Jae Ick Choi
- Issue Date
- 2009-03
- Citation
- Progress in Electromagnetics Research Letters, v.7, no.알수없음, pp.59-68
- ISSN
- 1937-6480
- Publisher
- EMW Publishing
- Language
- English
- Type
- Journal Article
- Abstract
- A new approach to analyze the behavior of a Fabry-Pérot cavity type high-gain antenna covered with a frequency selective surface (FSS) superstrate is presented. Using an image theory and effective constitutive parameter retrieval, properties of impedance and a refractive index of the entire cavity structure are investigated. Through the analysis, we show that our antenna inherently operates in the medium whose maximum magnitude of the refractive index is lower than '0.5'. In consequence, we demonstrate that the high-gain feature of the Fabry-Pérot cavity antenna is not only due to satisfy a conventional cavity resonance condition, but also for a wave collimation effect of a metamaterial with the effectively low index of refraction. To show the collimation effect of the cavity, phase properties of a radiating wave with and without the FSS superstrate are examined. Moreover, the effect of the real and imaginary parts of the refractive index on behaviors of the antenna is also investigated by analyzing the derivative of a realized gain of the antenna within an impedance matched frequency band.
- KSP Keywords
- Cavity resonance, Cavity structure, Cavity type, Constitutive parameters, FSS superstrate, Frequency selective surfaces(FSS), Gain of the Antenna, High Gain Antenna(HGA), Imaginary part, Index of refraction, Low index