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Achieving tunable Kerker-type invisibility for a radiation-enhanced electrically small antenna
Peiqi Chen1, Qiuyue Nie1,2, Zhonglin Zhang2
1School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China.
Physical Review. E
|October 21, 2022
Summary
This study demonstrates tunable Kerker-type invisibility for antennas using a core-shell plasma structure. This advanced plasma design enables switching scattering direction while maintaining signal enhancement and omnidirectional invisibility.
Area of Science:
- Electromagnetic theory
- Plasma physics
- Antenna engineering
Background:
- Low-temperature gaseous plasmas offer potential for tunable electromagnetic devices.
- Electrically small antennas often face challenges with radiation and scattering properties.
Purpose of the Study:
- To achieve tunable Kerker-type invisibility for a radiation-enhanced electrically small antenna.
- To investigate the role of overdense-underdense core-shell plasma structures in controlling electromagnetic scattering.
Main Methods:
- Utilizing an overdense-underdense core-shell plasma structure.
- Applying electromagnetic multipole decomposition analysis.
- Analyzing scattering components (a1 and b1) and polarizability.
Main Results:
- Tunable Kerker-type invisibility was achieved, allowing switching between backward and forward scattering.
- Omnidirectional invisibility and signal enhancement were maintained.
- The underdense plasma modulated the electric dipolar scattering (a1) while preserving the magnetic dipolar term (b1), fulfilling quasi-Kerker conditions.
Conclusions:
- Core-shell plasma structures enable effective control over antenna scattering for invisibility applications.
- The findings pave the way for reconfigurable electromagnetic devices and enhanced antenna performance.
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