Analysis and design of conical transmission line power combiners

Simple item page
dc.contributor.advisorMeyer, P.en_ZA
dc.contributor.advisorVan der Walt, P. W.en_ZA
dc.contributor.authorDe Villiers, Dirk I. L.en_ZA
dc.contributor.otherUniversity of Stellenbosch. Faculty of Engineering. Dept. of Electrical and Electronic Engineering.
dc.date.accessioned2008-02-19T07:58:15Zen_ZA
dc.date.accessioned2010-06-01T08:20:34Z
dc.date.available2008-02-19T07:58:15Zen_ZA
dc.date.available2010-06-01T08:20:34Z
dc.date.issued2007-12en_ZA
dc.descriptionThesis (PhD (Electrical and Electronic Engineering))--University of Stellenbosch, 2007.
dc.description.abstractThis dissertation presents a technique for the design of N-way conical line power combiners, which offers significant advantages over existing axially symmetric combining techniques. A full analytical study of conical transmission lines is done, and evaluated results are presented. These include a proof of the cutoff frequency equation, and plots of the field patterns, of higher order modes which are unavailable in literature. A coaxial fed conical line combiner for 10 inputs is proposed, designed and evaluated. The design technique relies on the uniform transmission line characteristics of the conical lines to eliminate the need for complex full wave optimisation, typically needed in the design of the more commonly used radial line combiners. Circuit models are instead employed to achieve a wide matched bandwidth by using optimised stepped impedance coaxial lines to feed the combining structure. The prototype developed at X-band displays more than an octave bandwidth with a return loss of better than -14.5 dB. Using tapered line matching sections increases the power handling capability of the combiner by eliminating sharp edges, and allows for tolerance insensitive manufacture of the structure by widening conductor spacings. Such a 10-way prototype is developed at X-band which displays a -18.7 dB return loss bandwidth of 47% with very low losses. A study is done to determine the limitations on the design of general N-way combiners, and the results are incorporated into the design technique. The full process is demonstrated by the design and simulation of a 30-way combiner at Ku-band which displays a simulated -20 dB return loss bandwidth of 34%. The design technique is simple to execute and requires very little full wave analysis. Results obtained with the manufactured combiners are better than those of any previously published axially symmetric combiners.en_ZA
dc.format.extent6383629 bytesen_ZA
dc.format.mimetypeapplication/pdfen_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/1392
dc.language.isoenen_ZA
dc.publisherStellenbosch : University of Stellenbosch
dc.rights.holderUniversity of Stellenbosch
dc.subjectCombinersen_ZA
dc.subjectRadial combinersen_ZA
dc.subjectConical combinersen_ZA
dc.subjectConical transmission tines,en_ZA
dc.subjectN-way combinersen_ZA
dc.subjectDissertations -- Electrical and electronic engineeringen
dc.subjectTheses -- Electrical and electronic engineeringen
dc.titleAnalysis and design of conical transmission line power combinersen_ZA
dc.typeThesisen_ZA
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
devilliers_analysis_2007.pdf
Size:
5.98 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.72 KB
Format:
Plain Text
Description:
Download
Collections
Doctoral Degrees (Electrical and Electronic Engineering)