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Planar, wide-band omnidirectional retroreflector using metal-only transmitarray structure for TE and TM polarizations
Ali Pesarakloo1, Mohammad Khalaj-Amirhosseini2
1Electromagnetic Waves Propagation Laboratory, School of Electrical Engineering, Iran University of Science and Technology, Tehran, 1684613114, Iran. ali_pesarakloo@elec.iust.ac.ir.
Scientific Reports
|July 5, 2022
Summary
This study introduces a novel metal-only retroreflector that provides omnidirectional retroreflectivity for electromagnetic waves across a wide elevation angle. This innovation enables efficient reflection in all azimuth angles for various applications.
Area of Science:
- Electromagnetics and Optics
- Metamaterials and Metasurfaces
Background:
- Retroreflectors are crucial for redirecting electromagnetic waves back to their source.
- Existing retroreflector designs often have limitations in angular coverage or bandwidth.
Purpose of the Study:
- To propose and demonstrate a novel planar, wideband, metal-only retroreflector.
- To achieve omnidirectional retroreflectivity over a wide elevation and azimuth angle range.
Main Methods:
- Designed a symmetrical transmitarray using the generalized multifocal approach.
- Integrated a metal plate with the transmitarray to achieve retroreflection.
- Simulated the design using CST STUDIO software and fabricated it using laser cutting technology.
Main Results:
- Achieved omnidirectional retroreflectivity in all azimuth angles.
- Demonstrated a half-power elevation field of view of 60° (-30° to 30°).
- Observed wideband performance (17% bandwidth) from 8.5-10 GHz for both TE and TM polarizations.
Conclusions:
- The proposed metal-only retroreflector offers efficient and omnidirectional retroreflection.
- The design is suitable for applications requiring wide angular coverage and broadband operation.
- Experimental results validate the simulation findings, confirming the device's performance.
