Efficient beam splitting using zero-load-impedance metagratings.

Area of Science:

• Electromagnetics and Wave Phenomena
• Metamaterial Devices
• Antenna and Microwave Engineering

Background:

• Metagratings offer efficient beam splitting but often require complex structures for impedance matching.
• Existing metagrating designs face implementation constraints, limiting their application at higher frequencies and increasing fabrication costs.

Purpose of the Study:

• To propose and demonstrate a novel metagrating design for efficient beam splitting with zero load impedance.
• To overcome fabrication limitations by utilizing simple microstrip-line structures for cost-effective manufacturing.
• To enable the application of metagratings at higher frequencies using standard printed circuit board (PCB) technology.

Main Methods:

• Theoretical design of metagratings based on microstrip-line structures.
• Numerical optimization techniques to achieve specific design parameters for beam splitting.
• Experimental fabrication and measurement of reflection-type beam-splitting devices at 30 GHz.

Main Results:

• The proposed metagrating, composed solely of microstrip-line structures, achieves efficient beam splitting with zero load impedance.
• Demonstrated high performance of the metagrating devices at 30 GHz.
• Successful experimental validation of the designed beam-splitting devices with varying pointing angles.

Conclusions:

• Simple microstrip-line metagratings provide an effective and low-cost solution for efficient beam splitting.
• This approach overcomes implementation challenges, paving the way for widespread adoption of metagratings at millimeter-wave and higher frequencies.
• The developed metagratings are suitable for low-cost PCB fabrication, enhancing accessibility for various applications.