How do I design a waveguide system at D-band frequencies and what are the standard waveguide sizes?
Designing a waveguide system at D-band uses standard rectangular waveguide WR-6.5 (internal dimensions 1.651 x 0.826 mm) which covers 110-170 GHz. The attenuation in WR-6.5 is approximately 3-5 dB/m for gold-plated brass or copper waveguide. Standard flanges use UG-387/U-M or the IEEE 1785 precision alignment flange with dowel pins. The most critical design consideration is achieving low-loss waveguide-to-MMIC transitions, typically using E-plane probes or finline tapers. Misalignment of even 50 micrometers at waveguide junctions can cause significant return loss degradation.
Waveguide Architecture for D-Band Communication Systems
At D-band frequencies, rectangular waveguide remains the lowest-loss interconnect technology.
Common Questions
Frequently Asked Questions
Can I use flexible waveguide at D-band?
Flexible waveguide is available but has higher loss (10-20 dB/m). Use only where flexibility is essential.
What is the power handling capability of WR-6.5 waveguide?
Approximately 100-200 mW of CW power at standard atmospheric pressure.
How do I machine WR-6.5 waveguide channels?
Using end mills of 0.5-0.8 mm diameter in CNC milling centers with 5-micrometer positioning accuracy, typically in split-block configuration.
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