waveguide impedance meaning

• [Electronics]
  Where the power P is known, and voltage E and current I are defined, with respect to a type of wave and waveguide, the value is either E²/P or P/I².
  
  
  waveguide junction A fitting that allows one waveguide section to be joined at an angle to another section. See, for example, WAVEGUIDE TEE and WAVEGUIDE WYE.
  

• "waveguide impedance" meaning in Chinese: 波导阻抗