Browsing by Author "Du Toit, Hendrik J."

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    Partially filled radial power combiner with port isolation
    (Stellenbosch : Stellenbosch University, 2020-03) Du Toit, Hendrik J.; De Villiers, D. I. L.; Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering.
    ENGLISH ABSTRACT: This dissertation documents the design and testing of a partially filled radial power combiner with a passive peripheral isolation network, at 4 GH'. A review of available literature on power combiners highlights the advantages of radial combiners. The theory of radial transmission lines is presented, and such a power combiner without an isolation network is designed first. A printed circuit board is utilised at the bottom of the radial line cavity to aid in transitions at the central and peripheral ports. The centre transition into a coaxial connector consists of a shunt capacitance realised by an annular ring on the PCB. This also acts as a base for the coaxial connector. At the periphery, inductive posts couple energy from the radial cavity into microstrip lines. This approach is taken for compatibility with the ensuing planar passive isolation network at the peripheral ports. Broadside hybrid quadrature couplers are arranged around two almost identical radial combiners to implement the isolation.