Seminar: Electro-Optics and Microelectronics Seminar
Cavity-Excited Switched-Beam Metagrating Antennas
Date:
September,18,2023
Start Time:
14:30 - 15:30
Location:
1061, Meyer Building
Zoom:
Zoom link
Add to:
Lecturer:
Fengming Hu
Research Areas:
| We introduce the concept of cavity-excited switched-beam metagrating antennas, offering a new path towards dynamic beamforming. The device is based on printed-circuit-board (PCB) metagratings (MGs), sparse arrays of subwavelength scatterers (meta-atoms) synthesized via accurate tailoring of mutual coupling. Multiple simple sources embedded in the cavity serve as excitations for a passive multilayered multielement MG superstrate, designed to generate different radiation patterns in response to each of the source ports. The developed synthesis approach utilizes the cavity eigenmode expansion of the source and radiation fields to realize the desired aperture field distributions, relying on high-fidelity analytical models to devise the multifunctional loaded-wire MGs. To validate our scheme, switched-beam antennas with increasing aperture size and complexity are designed and verified in full-wave simulations, exhibiting high aperture illumination efficiencies for all radiation states. In addition, we show that the analytical model can be used to control the frequency response of the antenna. Harnessing this feature, we demonstrate the capability to realize cavity-excited MG antennas with enhanced bandwidth or frequency diverse patterns, the latter being of interest for emerging imaging and communication security schemes. The semianalytical methodology offers an alternative path to obtain effective antennas with dynamically controlled radiation patterns, based on the versatile (passive) MG platform. Avoiding nonlinear components and full-wave optimization, such benefits may be extremely useful for high-frequency operating regimes expected in future communication systems. M.Sc. student under the supervision of Prof. Ariel Epstein.
|