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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
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Programming nonreciprocity and harmonic beam steering via a digitally space-time-coded metamaterial antenna
Shaghayegh Vosoughitabar1, Chung-Tse Michael Wu2
1Department of Electrical and Computer Engineering, Rutgers, the State University of New Jersey, Piscataway, USA.
Scientific Reports
|May 5, 2023
Summary
A novel digitally space-time-coded metamaterial antenna enables nonreciprocal electromagnetic wave control. This metamaterial antenna achieves simultaneous space and frequency domain manipulation for advanced applications.
Area of Science:
- Metamaterials
- Electromagnetic Wave Manipulation
- Antenna Engineering
Background:
- Digital coding metasurfaces offer spatiotemporal control of electromagnetic (EM) waves.
- This control enables manipulation in both space and frequency domains, leading to time-reversal asymmetry.
Purpose of the Study:
- To theoretically and experimentally demonstrate a digitally space-time-coded metamaterial (MTM) antenna.
- To show its capability as a radiating counterpart to digital metasurfaces for nonreciprocal EM wave control.
Main Methods:
- Utilizing spatiotemporal modulation at the unit cell level of the MTM antenna.
- Employing varactor diodes and field-programmable gate array (FPGA) for programmable propagation constants and digital sequences.
- Operating in the fast wave (radiation) region for surface-to-leaky-wave transformation.
Main Results:
- Demonstration of nonreciprocal EM wave transmission and reception.
- Generation of harmonic frequencies with distinct main beam directions due to time-varying coding.
- Successful breaking of time-reversal symmetry in the MTM antenna.
Conclusions:
- The digitally space-time-coded MTM antenna facilitates nonreciprocal EM wave control.
- This technology opens possibilities for simultaneous transmitting and receiving, unidirectional transmission, and advanced radar and MIMO systems.
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