Broadband eight-way coaxial waveguide high power combiner/divider

Abstract

This article proposes two broadband eight-way coaxial combiner/dividerat 4–14 GHz frequency range. Two structures are introduced and designed based on physical limitation of structure and the best reflection coefficient through multi section and Klopfenstein taper matching. In multi section matching, a central coaxial line to peripheral coaxial line transition is employed to realize the circuit model elements values and, thus, achieve an excellent matching over frequency range. In second design, a combination of central coaxial line to peripheral coaxial line transition and Klopfenstein taper is employed to achieve an excellent wide band matching. Simulated structures have more than three octave bandwidth from 4 to 14 GHz for a return loss greater than 10 dB. The field strength simulation of the structure at 9 GHz with 20-KW output power shows that the maximum electric field that occurs on the sharp edges is ten times lower than the air-dielectric breakdown voltage, which is the typical maximum peak power handling of 7/16 connectors.