The transition between any two different waveguides is of some interest in the design of filters and other waveguide components. One canonical representation of such a discontinuity is a lumped element susceptance in cascade with an ideal transformer. The purpose of this chapter is to summarise some experimental data on a transition between an ordinary waveguide and a single ridge one. This sort of data may be experimentally extracted by making separate measurements on the external quality factor and resonant frequency of a half-wave long prototype. The network variables of the over all arrangement are separately established by using the ABCD notation. The chapter includes a careful characterisation of this problem region for each possible definition of impedance in the waveguide. The work outlined here omits, in keeping with some prior art, the effect of the lumped element susceptance of the discontinuity on the description of the external quality factor but, in keeping with some previous work, retains it in that of the midband frequency.

Inspec keywords: lumped parameter networks; ridge waveguides

Other keywords: waveguide components; canonical representation; lumped element susceptance; single ridge waveguide; half-wave long prototype; discontinuity effects; external quality factor; resonant frequency

Subjects: Waveguides and microwave transmission lines