Serrodyne Frequency Translation Using Time-Modulated Metasurfaces

Temporally modulated metamaterials have attracted significant attention recently due to their nonreciprocal and frequency converting properties. Here, a transparent, time-modulated metasurface, which functions as a serrodyne frequency translator, is reported at <inline-formula> <tex-math no...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation Vol. 68; no. 3; pp. 1599 - 1606
Main Authors: Wu, Zhanni, Grbic, Anthony
Format: Journal Article
Language:English
Published: New York IEEE 01.03.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Frequency analysis
Frequency conversion
Frequency modulation
Frequency translation
Harmonic analysis
Metamaterials
Metasurfaces
Modal analysis
Phase shifters
Refractive index
Sawtooth waveforms
Time-frequency analysis
time-modulated metasurfaces
ISSN:0018-926X, 1558-2221
Online Access:Get full text
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Summary:Temporally modulated metamaterials have attracted significant attention recently due to their nonreciprocal and frequency converting properties. Here, a transparent, time-modulated metasurface, which functions as a serrodyne frequency translator, is reported at <inline-formula> <tex-math notation="LaTeX">X </tex-math></inline-formula>-band frequencies. With a simple biasing architecture, the metasurface provides electrically tunable transmission phase that covers 360°. A sawtooth waveform is used to modulate the metasurface, allowing Doppler-like frequency translation. Modal analysis of an analogous time-modulated medium is performed to gain insight into the operation of the metasurface-based serrodyne frequency translator. Two such metasurfaces can be cascaded together to achieve magnetless devices that perform either phase or amplitude nonreciprocity.
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ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2019.2943712