Compact waveguide-integrated metasurface twist with filtering and phase shifting capabilities for millimeter-wave...

Area of Science:

• Electromagnetics and Wave Phenomena
• Metasurface Engineering
• Microwave and Millimeter-Wave Integrated Circuits

Background:

• Metasurfaces offer advanced control over wave properties like amplitude, phase, and polarization, crucial for modern communication devices.
• Existing metasurfaces are primarily designed for free-space applications, limiting their integration into guided-wave systems.
• There is a need for compact and efficient solutions for manipulating guided waves within waveguides.

Purpose of the Study:

• To introduce and demonstrate a novel waveguide-integrated metasurface for guided-wave control.
• To achieve multifunctional wave manipulation, including polarization rotation, bandpass filtering, and phase shifting, within a compact structure.
• To develop a high-performance solution for millimeter-wave (mm-wave) guided-wave systems.

Main Methods:

• Designed a metasurface consisting of a 3x3 array of dog bone-shaped resonators and orthogonal gratings.
• Integrated the metasurface between two rectangular waveguides with a 90° twist for guided-wave manipulation.
• Fabricated and tested a prototype device operating in the 26.6-29 GHz frequency band.

Main Results:

• The fabricated metasurface achieved polarization rotation, bandpass filtering, and phase shifting functionalities.
• The device exhibited an average insertion loss of 0.6 dB, with a minimum of 0.34 dB at 28 GHz.
• Demonstrated a compact solution with a device thickness of only 0.16λg, suitable for mm-wave guided-wave systems.

Conclusions:

• The developed waveguide-integrated metasurface provides a compact and high-performance method for guided-wave control.
• This technology enables precise tuning of wave properties within waveguides, advancing mm-wave communication systems.
• The design offers a significant step towards multifunctional guided-wave devices with reduced form factors.