abdoeng
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TITLE High-impedance electromagnetic surfaces
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AUTHOR Sievenpiper, Daniel Frederic
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DEGREE PhD
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SCHOOL UNIVERSITY OF CALIFORNIA, LOS ANGELES
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DATE 1999
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PAGES 150
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ADVISER Yablonovitch, Eli
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SUBJECT ENGINEERING, ELECTRONICS AND ELECTRICAL (0544)
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DIGITAL FORMATS PDF 4.62Mb image-only PDF
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Abstract
A new type of metallic electromagnetic structure has been developed that is characterized by having high surface impedance. Although it is made of continuous metal, and conducts DC currents, it does not conduct AC currents within a forbidden frequency band. Unlike normal conductors, this new surface does not support propagating surface waves, and it reflects electromagnetic waves with no phase reversal. The geometry consists of a metal sheet, textured with a two-dimensional lattice of resonant elements, which act as a two-dimensional filter to prevent the propagation of electric currents. The surface can be described using a lumped parameter circuit model, which accurately predicts many of its electromagnetic properties. This unique material is applicable to a variety of electromagnetic problems, including new kinds of low-profile antennas
rhanks for mr tsb_nph for help me
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AUTHOR Sievenpiper, Daniel Frederic
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DEGREE PhD
----------
SCHOOL UNIVERSITY OF CALIFORNIA, LOS ANGELES
----------
DATE 1999
----------
PAGES 150
----------
ADVISER Yablonovitch, Eli
----------
SUBJECT ENGINEERING, ELECTRONICS AND ELECTRICAL (0544)
----------
DIGITAL FORMATS PDF 4.62Mb image-only PDF
----------
Abstract
A new type of metallic electromagnetic structure has been developed that is characterized by having high surface impedance. Although it is made of continuous metal, and conducts DC currents, it does not conduct AC currents within a forbidden frequency band. Unlike normal conductors, this new surface does not support propagating surface waves, and it reflects electromagnetic waves with no phase reversal. The geometry consists of a metal sheet, textured with a two-dimensional lattice of resonant elements, which act as a two-dimensional filter to prevent the propagation of electric currents. The surface can be described using a lumped parameter circuit model, which accurately predicts many of its electromagnetic properties. This unique material is applicable to a variety of electromagnetic problems, including new kinds of low-profile antennas
rhanks for mr tsb_nph for help me