In-line Coaxial Excitation of Rectangular Waveguides

In this paper we present an efficient and accurate CAD procedure for the full-wave characterization of in- line coaxial excitations of rectangular waveguides. For the sake of analysis, the structure is decomposed into the cascade of uniform waveguide sections. The complete structure is then analvzed using the multiniode admittance method. A very efficient technique is used for the evaluation of the modes and of the coupling integrals. In addition to theory. measured results are also presented thereby fully validating the proposed procedure.