| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 95 === In order to realize a broadband slotline-to-rectangular waveguide transition, we adopt a truncated bow-tie antenna, which possess a broadband characteristic. This transition is designed in X-band (8.2-12.4 GHz) to make the insertion loss as small as possible and the return loss as large as possible in the full band of X-band. A complete analysis, design procedure, and measurement verification are discussed in the following contents of this thesis. Through proper design, the simulation results show a wideband response for a single transition with a insertion loss smaller than 0.1 dB and a return loss larger than 15 dB.
In order to verify our results, we fabricate a back to back transition composing of two single transitions connected back to back. The simulation and measurement results of the back to back transition agree well in the full band of X-band. The simulation and measurement insertion losses are smaller than 0.25 dB and 0.4 dB in the full band of X-band, respectively and the simulation and measurement return losses are larger than 13 dB and 15 dB, respectively.
While the wideband slotline-to-rectangular waveguide transition is accomplished, it is used to implement a wideband CPW-to-rectangular waveguide transition by integrating it with a CPW-to-slotline transition. The simulation results show that the return loss is larger than 14 dB and the insertion loss is smaller than 0.2 dB over the entire X-band, which means that a wideband performance could be easily achieved by this structure, also.
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