Vanadium dioxide thin films integrated with printed circuit board enables low-cost, reconfigurable millimeter-wave...

Area of Science:

• Electrical Engineering
• Materials Science
• Telecommunications

Background:

• Millimeter-wave switches are critical for adaptive communication systems.
• Existing solutions often present challenges in performance, scalability, and cost.
• Need for improved reconfigurable millimeter-wave components.

Purpose of the Study:

• To present a scalable, high-performance, and cost-effective method for reconfigurable millimeter-wave substrate integrated waveguide (SIW) devices.
• To integrate vanadium dioxide (VO₂) thin films with printed circuit board (PCB) technologies for novel device fabrication.
• To demonstrate the practical application of this integration for various millimeter-wave components.

Main Methods:

• Depositing VO₂ films on flexible polymer substrates.
• Transferring and affixing VO₂-coated substrates to PCB circuits.
• Thermally activating and selectively doping VO₂ to optimize power consumption.
• Fabricating and testing prototype reconfigurable millimeter-wave switches and a hybrid coupler.

Main Results:

• Demonstrated functional reconfigurable millimeter-wave devices, including series/parallel switches and a hybrid coupler.
• Validated performance through electromagnetic simulations and experimental measurements.
• Achieved low insertion loss, good isolation, and broadband operation.
• Showcased the transformation of a hybrid coupler into dual through-line SIWs.

Conclusions:

• The VO₂/PCB integration offers a simplified fabrication process for reconfigurable millimeter-wave SIW devices.
• The method supports large-area integration, paving the way for scalable, low-cost components.
• This approach provides a practical solution for next-generation adaptive millimeter-wave communication systems.