Phase element comprising a stack of alternating conductive patterns and dielectric layers providing phase shift through capacitive and inductive couplings
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United States of America Patent
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Jun 3, 2014
Grant Date -
Feb 3, 2011
app pub date -
Jul 28, 2010
filing date -
Jul 31, 2009
priority date (Note) -
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Abstract
A thin electromagnetic phase shifting element, named phase and amplitude shifting surface (PASS), is disclosed. The PASS is capable of independently altering both the phase and the amplitude distribution of the electromagnetic fields propagating through the structure. The element comprises a few patterned metallic layers separated by dielectric layers. The patterns of the metallic layers are tuned to locally alter the phase and/or the amplitude of an incoming electromagnetic wave to a prescribed set of desired values for the outgoing electromagnetic wave. The PASS can be applied to design components such as gratings, lenses, holograms, and various types of antennas in the microwave, millimeter wave and sub-millimeter wave.
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