Partially filled radial power combiner with port isolation

Du Toit, Hendrik J. (2020-03)

Thesis (PhD)--Stellenbosch University, 2020.

Thesis

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.

AFRIKAANSE OPSOMMING: Hierdie proefskrif beskryf die ontwerp en toets van ‘n gedeeltelik gevulde radiale kombineerder met n passiewe isolasie netwerk, by 4 GHz. Die voordele van radiale kombineerders blyk uit die oorsig van beskikbare literatuur. Na ‘n uitleg van die betrokke teorie word n poging aangewend om eerstens ‘n radiale kombineerder te ontwerp sonder die isolasie netwerk. Die middel konnektor termineer op ‘n koper ring, uitgeëts op n dielektriese substraat. Daar word gebruik gemaak van induktiewe penne en mikrostrook lyne by die poorte aan die omtrek van die kombineerder. Sodoende is die kombineer gepas vir uitbreiding met ‘n planêre isolasie netwerk. Die netwerk bestaan uit ‘n rangskikking van 3-dB breësy kwadratuurkoppelaars wat twee eenderse radiale kombineerders aanmekaar haak.

Please refer to this item in SUNScholar by using the following persistent URL: http://hdl.handle.net/10019.1/108140
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