Branch Waveguide Couplers with a frequency of 510 GHz for Terahertz Transmit/Receive Isolation Applications

Area of Science:

• Engineering
• Electromagnetics
• Microwave and Terahertz Technology

Background:

• Terahertz (THz) transceiver systems require effective transmit/receive (T/R) isolation.
• Waveguide directional couplers are essential components for T/R isolation in these systems.

Purpose of the Study:

• To develop and present two novel multi-branch waveguide directional couplers for THz transceiver systems.
• To achieve high isolation performance at a center frequency of 510 GHz.

Main Methods:

• Design and fabrication of a five-branch and a three-branch waveguide directional coupler.
• Utilized low-cost Computer Numerical Control (CNC) milling technologies for fabrication.
• Performance verification through experimental measurements.

Main Results:

• Demonstrated high isolation performance at the center frequency of 510 GHz for both coupler designs.
• The five-branch coupler offers high performance, while the three-branch coupler presents lower processing difficulty.
• Successful fabrication using cost-effective CNC milling.

Conclusions:

• The presented waveguide directional couplers meet the requirements for T/R isolation in THz systems.
• The developed couplers are suitable for practical implementation in THz transceiver systems due to their performance and fabrication methods.