Whitepaper

Waveguide Insights: Understanding Rectangular and Double-Ridge Designs for Enhanced RF Systems

Exodus Advanced Communications

This application note details rectangular and double-ridge waveguides for RF system applications like communications, radar, and EMC/EMI testing. It outlines design considerations including dimensions (e.g., WR90 with a 0.90” inner width), materials (aluminum, copper, silver plating >18GHz), and operating principles—specifically the TE10 mode in rectangular waveguides and cutoff frequencies. Tables provide specifications for standard waveguides (WR4 to WR975) covering frequency ranges up to 50 GHz, power ratings (CW up to 200kW, peak up to 50000kW), and dimensions. Double-ridge designs are presented as offering wider bandwidth at the expense of insertion loss and power handling. Power handling considerations address average power dissipation through heat sinking and preventing breakdown due to peak voltages.