| 摘要 |
PURPOSE:To prevent the influence of an auxiliary waveguide upon a main waveguide by inserting a radio wave absorbing body into a waveguide whose long sides are narrowed into a taper shape and connecting this waveguide to the end part of the auxiliary waveguide. CONSTITUTION:Terminating waveguides 10 are narrowed into a taper shape up to such dimensions that dimensions of long sides of an auxiliary waveguide 2 reflect completely radio waves having a frequency f1, and radio wave absorbing bodies are inserted in parts having dimensions smaller than those which reflect completely radio waves having the frequency f1. Therefore, radio waves having the frequency f1 which are branched to the auxiliary waveguide are taken out from coaxial tubes 6 by converters constituted with terminating waveguides 10 and coaxial tubes 6. Meanwhile, radio waves having a frequency f2 which are leaked to the auxiliary waveguide 2 are absorbed by radio wave abosrbing bodies 11. Consequently, cavity resonance of radio waves having the frequency f2 cannot be caused in the auxiliary waveguide 2, and radio waves having the frequency f2 which are leaked to the auxiliary waveguide 2 have no influence upon radio waves having the frequency f2 which pass through a main waveguide 1, and the increase of loss and a delay distortion are not generated. |
