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Design and Fabrication of a 16-Way Ultra-Wideband Spatial Power Divider/Combiner

Hosseini Romqani, Esmail | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39701 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Banai, Ali
  7. Abstract:
  8. High power, broadband amplifiers at microwave and millimeter wave frequencies are needed for military and civilian applications. High power, broadband, high linearity, low noise, high efficiency and graceful degradation on failure are among the most important features in amplifier design. Solid state and vacuum tube devices have many disadvantages. A promising solution has been spatial power combining technique. Spatial power combining is a method of coherently combining the power of many amplifying devices using free space as the power dividing/combining medium within a guided wave structure in contrast to traditional circuit based amplifiers. This thesis presents the design and fabrication of a 16-way ultra broadband spatial power divider/combiner. A comprehensive investigation of different methods and architectures of spatial power combining is performed. An oversized TEM guiding wave structure was used as the host of the combining circuits which incorporates an antipodal finline array. Galerkin’s technique in the spectral domain was used to analysis the antipodal finline transitions. A step by step approach for design and simulation of the structures with tray architecture is performed. The oversized TEM guided wave structure and antipodal transitions were designed by using the theory of small reflection and near optimum design. All modules including RF boards and mechanical structures were fabricated. Measurements show a good agreement with simulations. Return loss better than 10dB and insertion loss better than 2dB in 2-18 GHz band were achieved.
  9. Keywords:
  10. Spatial Power Combining ; Ultra Wideband ; Antipodal Finline Transition ; Galerkin Method in the Spectrum Domain ; TEM Guided Wave Structure ; Power Combining Efficiency

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