A gap waveguide-based mechanically reconfigurable phase shifter for high-power Ku-band applications.

Area of Science:

• Electromagnetics
• Microwave Engineering
• Waveguide Technology

Background:

• Phase shifters are crucial components in radar and satellite systems for beamforming.
• Traditional phase shifters often face limitations in bandwidth, insertion loss, and power handling.
• Groove gap waveguide (GGW) technology offers a contact-less solution for improved performance.

Purpose of the Study:

• To present a novel reconfigurable broadband phase shifter design.
• To leverage GGW technology for enhanced performance, particularly low loss and high power handling.
• To achieve a wide operational bandwidth and significant phase shift capability.

Main Methods:

• Design and fabrication of a phase shifter utilizing folded GGW and bends.
• Incorporation of a movable plate mechanism for adjusting waveguide length and phase.
• Electromagnetic simulation and experimental measurement for performance validation.

Main Results:

• Achieved a 37% impedance bandwidth centered at 13 GHz.
• Demonstrated a maximum insertion loss of 0.6 dB.
• Obtained a maximum phase shift of 770°.
• Validated the GGW technology's advantage of no electrical contact, enabling free movement of parts without leakage.

Conclusions:

• The proposed GGW phase shifter offers a practical, low-loss, and reconfigurable solution.
• The fixed input/output port positions enhance practical usability.
• The device is suitable for demanding radar and satellite applications requiring precise phase control.