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Rectangular to elliptical waveguide connection

  • US 4,540,959 A
  • Filed: 11/22/1983
  • Issued: 09/10/1985
  • Est. Priority Date: 11/22/1983
  • Status: Expired due to Term
First Claim
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1. A waveguide connection comprising the combination ofa rectangular waveguide,an elliptical waveguide having a cutoff frequency and impedance different from those of said rectangular waveguide,an inhomogeneous stepped transformer joining said rectangular waveguide to said elliptical waveguide, said transformer having multiple sections all of which have inside dimensions small enough to cut off the first excitable higher order mode in a preselected frequency band,each section of said transformer having an elongated transverse cross section which is symmetrical about mutually perpendicular transverse axes which are common to those of said rectangular and elliptical waveguides, andthe inside dimensions of said elongated transverse cross section increasing progressively from step to step in all four quadrants along the length of the transformer and at each step in the transformer, in the direction of both of said transverse axes, so that both the cutoff frequency and the impedance of said transformer vary monotonically along the length of said transformer.

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