benjamin d. braaten* dimitrios e. anagnostou keith w. whites
DESCRIPTION
Mutual Coupling Between Coax-fed Rectangular Microstrip Antennas Embedded in Layered Uniaxial Anisotropic Dielectrics. Benjamin D. Braaten* Dimitrios E. Anagnostou Keith W. Whites. 1. 2. 2. - PowerPoint PPT PresentationTRANSCRIPT
Mutual Coupling Between Coax-fed Mutual Coupling Between Coax-fed Rectangular Microstrip Antennas Embedded Rectangular Microstrip Antennas Embedded in Layered Uniaxial Anisotropic Dielectricsin Layered Uniaxial Anisotropic Dielectrics
Benjamin D. Braaten*Benjamin D. Braaten*Dimitrios E. AnagnostouDimitrios E. AnagnostouKeith W. WhitesKeith W. Whites
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1. North Dakota State University, Department of Electrical and Computer Engineering, Fargo, North Dakota.2. South Dakota School of Mines and Technology, Department of Electrical and Computer Engineering, Rapid City, South Dakota.
TopicsTopics
Problem DefinitionProblem Definition Interests and BackgroundInterests and Background Mutual Coupling ResultsMutual Coupling Results
Single anisotropic substrateSingle anisotropic substrate Single anisotropic superstrateSingle anisotropic superstrate Separated by an anisotropic layerSeparated by an anisotropic layer
Discussion/ConclusionDiscussion/Conclusion
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Problem DefinitionProblem DefinitionConsider:Consider:
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Optical axis is in the y-Optical axis is in the y-direction.direction.
Interests and BackgroundInterests and Background
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The previous problem is of interest in many fields. The previous problem is of interest in many fields. Microstrip antenna arrays [1].Microstrip antenna arrays [1]. Frequency Selective Structures (FSS) [2].Frequency Selective Structures (FSS) [2]. Radio Frequency Identification (RFID) [3].Radio Frequency Identification (RFID) [3]. IC based antennas.IC based antennas. ““Engineered Materials” [4].Engineered Materials” [4].
[1] David M. Pozar and Daniel H. Schaubert, “Microstrip Antennas: The analysis and Design of Microstrip Antennas and Arrays”, IEEE Press, Piscataway, NJ, 1995.[2] A.L.P.S. Campos an A.G. d'Assuncao, “Scattering parameters of a frequency selective surface between anisotropic dielectric layers for incident co-polarized plane waves,” IEEE Antennas and Propagation Society International Symposium, 2001, Vol. 4, July 8-13, 2001, p. 382-385.[3] K. Finkenzeller, RFID Handbook:Fundamentals and Applications in Contactless Smart Cards and Identification, John Wiley and Sons, West Sussex, England, 2003.[4] E. A. Navarro, A. Luximon, I. J. Craddock, D. L. Paul and M. Dean, “Multilayer and conformal antennas using synthetic dielectric substrates,” IEEE Antennas and Propagation, Vol. 51, No. 4, pp. 905-908, 2003.
Microstrip Patch ResultsMicrostrip Patch Results
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Consider: Consider: L = 6.55 cm, L = 6.55 cm, W = 10.57 cm, W = 10.57 cm, dd11 = d = d22 = 1.58 cm = 1.58 cm f = 1.41 GHz.f = 1.41 GHz.
Microstrip Patch ResultsMicrostrip Patch Results
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xxdd = 16.8 mm = 16.8 mmzzdd = 52.85 mm = 52.85 mmf = 1.41 GHzf = 1.41 GHzPermittivity = 4.25Permittivity = 4.25(chosen by isolating (chosen by isolating
the patch)the patch)
Microstrip Patch ResultsMicrostrip Patch Results
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A single grounded A single grounded anisotropic anisotropic substratesubstrate(d(d11 = 1.58 mm and = 1.58 mm and dd22 = 0 mm.): = 0 mm.):
(Pozar) David M. Pozar and Daniel H. Schaubert, “Microstrip Antennas: The analysis and Design of Microstrip Antennas and Arrays”, IEEE Press, Piscataway, NJ, 1995.
Microstrip Patch ResultsMicrostrip Patch Results
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A single grounded A single grounded anisotropic anisotropic substratesubstrate(d(d11 = 1.58 mm and = 1.58 mm and dd22 = 0 mm.): = 0 mm.):
Microstrip Patch ResultsMicrostrip Patch Results
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A single A single anisotropic anisotropic covercover(d(d11 = 1.58 mm = 1.58 mm dd22 = 1.58 mm = 1.58 mmpermittivity = 4.25):permittivity = 4.25):
Microstrip Patch ResultsMicrostrip Patch Results
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A single A single anisotropic anisotropic covercover(d(d11 = 1.58 mm = 1.58 mm dd22 = 1.58 mm = 1.58 mmpermittivity = 4.25):permittivity = 4.25):
Microstrip Patch ResultsMicrostrip Patch Results
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Separated by a Separated by a single anisotropic single anisotropic layerlayer(d(d11 = 1.58 mm = 1.58 mm dd22 = 1.58 mm = 1.58 mmpermittivity = 4.25): permittivity = 4.25):
Microstrip Patch ResultsMicrostrip Patch Results
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Separated by a Separated by a single anisotropic single anisotropic layerlayer(d(d11 = 1.58 mm = 1.58 mm dd22 = 1.58 mm = 1.58 mmpermittivity = 4.25): permittivity = 4.25):
ConclusionConclusion
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The coupling between two rectangular microstrip The coupling between two rectangular microstrip patch antennas in layered anisotropic dielectrics patch antennas in layered anisotropic dielectrics was investigated.was investigated.
Initially, the E- and H-plane coupling between two Initially, the E- and H-plane coupling between two microstrip antennas on a single anisotropic microstrip antennas on a single anisotropic substrate was investigated.substrate was investigated. It is shown that the permittivity in the y-direction (direction It is shown that the permittivity in the y-direction (direction
of the optical axis) has the largest impact on the mutual of the optical axis) has the largest impact on the mutual coupling in BOTH the E- and H-planes.coupling in BOTH the E- and H-planes.
An increase in the permittivity of the substrate in the An increase in the permittivity of the substrate in the direction of the optical axis reduces the traditionally direction of the optical axis reduces the traditionally stronger E-plane coupling while increasing the traditionally stronger E-plane coupling while increasing the traditionally weaker H-plane coupling.weaker H-plane coupling.
ConclusionConclusion
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Next, the E- and H-plane coupling between two Next, the E- and H-plane coupling between two microstrip antennas with a single anisotropic microstrip antennas with a single anisotropic superstrate was investigated.superstrate was investigated. It is shown that the mutual coupling is slightly reduced in It is shown that the mutual coupling is slightly reduced in
both the E- and H-planes by an increase in permittivity in both the E- and H-planes by an increase in permittivity in both directions of the superstrate (i.e., in the direction of both directions of the superstrate (i.e., in the direction of the optical axis and in the direction orthogonal to the the optical axis and in the direction orthogonal to the optical axis).optical axis).
Finally, the two microstrip antennas were separated Finally, the two microstrip antennas were separated by a single anisotropic superstrate and the coupling by a single anisotropic superstrate and the coupling was investigated.was investigated. It is shown that both components of the permittivity affect It is shown that both components of the permittivity affect
the mutual coupling in both the E- and H-planes.the mutual coupling in both the E- and H-planes.
QuestionsQuestions
Thank you for listening!Thank you for listening!
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