Browsing by Author "Van Der Walt P.W."
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- ItemAn in situ tunable diode mounting topology for high-power X-band waveguide switches(2007) Sickel T.; Meyer P.; Van Der Walt P.W.An in situ tunable diode mounting topology for waveguide switches is presented and utilized to design and fabricate two evanescent-mode X -band switching modules of approximately 15% and 25% fractional bandwidth. The ability of the mounting topology to operate in a high-power environment is verified in an evanescent-mode X-band switch using six packaged p-i-n diodes, successfully reflecting 4 kW of pulsed power. © 2007 IEEE.
- ItemCharacteristics of coupling between dielectric resonators and slotline(1988) Van Der Walt P.W.; De Swardt J.B.The electrical coupling between a cylindrical dielectric resonator and a slotline is characterized experimentally. The relatively strong coupling which was obtained opens up new applications for dielectric resonators in microwave circuits.
- ItemDesign of a ten-way conical transmission line power Combiner(2007) De Villiers D.I.L.; Van Der Walt P.W.; Meyer P.Axially symmetric power combiners, such as radial line and conical line combiners, are very effective in combining the output signals from a large number of power amplifiers over a wide band with low losses. The main problem with radial lines is the behavior of the characteristic impedance against radial distance, which makes design of radial combiners difficult and normally optimization based. In this paper, a step-by-step design procedure is presented for the design of a conical line combiner. The design strategy relies on the transverse electromagnetic properties of the conical line to eliminate the need for complex full-wave optimization in the design process. Circuit models are instead employed and optimized to achieve a wide matched bandwidth. A ten-way proto-type was developed at X-band, which displayed more than an octave matched bandwidth with low insertion loss. © 2007 IEEE.
- ItemDiode mounting topologies for X-band waveguide switches(2007) Sickel T.; Meyer P.; Van Der Walt P.W.Diode mounting topologies for waveguide switches are presented and utilized to design and fabricate two evanescent-mode X-band modules of approximately 15 and 25% fractional bandwidth, comprising two packaged PIN diodes, with varying isolation, insertion loss and VSWR. ©2007 IEEE.
- ItemMicrowave engineers in South Africa(2011) Geschke R.; Meyer P.; Van Der Walt P.W.