公开(公告)号：US3603899A

公开(公告)日：1971-09-07

申请号：US3603899D

申请日：1969-04-18

Applicant: BELL TELEPHONE LABOR INC

Inventor： GYORGY ERNST M ,  JAEGER RAYMOND E ,  SEIDEL HAROLD

IPC: H01P1/207 ,  H01P1/208 ,  H01P7/06 ,  H03H9/00

CPC classification number: H01P1/2084 ,  H01P1/207 ,  H01P7/06

Abstract: A low loss microwave transmission structure composed of a section of waveguide within which is concentrically placed an array (one or more) of cylindrical sections of dielectric material with relative dielectric constant greater than four, spaced away from the walls by a significant fraction of the radius (at least of the order of 10 percent) and possessing appreciable discontinuities. In the dielectric loaded sections electromagnetic radiation is propagated primarily within the dielectric so that the losses observed are mainly a function of the dielectric material and are, to first order, insensitive to the wall composition or condition. In this most general form the structure can by synthesized as a low loss filter or equalizer. When operated at frequencies at which the unloaded waveguide is below cutoff a high-Q cavity can be formed. A single section cavity of this type has been used to measure the Q of the low loss high dielectric constant dielectrics. A particularly simple and easily adjustable coaxial input and output structure is available which couples strongly to the cylindrically symmetric TM01 mode, all other propagating modes being greatly disfavored.