Tunable evanescent mode X-band waveguide switch

dc.contributor.advisorMeyer, P.
dc.contributor.advisorVan der Walt, P. W.
dc.contributor.authorSickel, Thomasen_ZA
dc.contributor.otherUniversity of Stellenbosch. Faculty of Engineering. Dept. of Electrical and Electronic Engineering.
dc.descriptionThesis (PhD (Electric and Electronic Engineering))--University of Stellenbosch, 2005.
dc.description.abstractA tunable X-band PIN diode switch, implemented in evanescent mode waveguide, is presented. To allow in-situ tuning of resonances after construction, a novel PIN diode mounting structure is proposed and verified, offering substantial advantages in assembly costs. Accurate and time-effective modelling of filter and limiter states of the proposed switch is possible, using an evanescent mode PIN diode and mount model. The model is developed by optimizing an AWR Microwave Office model of a first order switch prototype with embedded PIN diode, to simultaneously fit filter and limiter measurements of four first order prototypes. The model is then used in the design of a third order switch prototype, achieving isolation of 62 dB over a 8.5 to 10.5 GHz bandwidth in the limiting state, as well as reflection of 15.73 dB and insertion loss of 1.23±0.155 dB in the filtering state over the same bandwidth.en_ZA
dc.format.extent4915274 bytesen_ZA
dc.publisherStellenbosch : University of Stellenbosch
dc.subjectWaveguide Switchen_ZA
dc.subjectPIN Diodesen_ZA
dc.subjectEvanescent Modeen_ZA
dc.subjectTunable Diode Mounten_ZA
dc.subjectTheses -- Electronic engineeringen_ZA
dc.subject.lcshDiodes, Switchingen_ZA
dc.subject.lcshMicrowave devicesen_ZA
dc.titleTunable evanescent mode X-band waveguide switchen_ZA
dc.rights.holderUniversity of Stellenbosch

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