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Design and Implementation of Novel Devices in Ka Band Using Ridge Gap Waveguide Technology

Ahmadi, Behzad | 2017

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 49753 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Banai, Ali
  7. Abstract:
  8. Ridge gap waveguide is a new technology with low loss and high power handling capability in millimeter wave(mm-wave) frequencies. In this technology there is no need for electrical connection between the constitutive parts and using dielectric material as a substrate. This thesis focuses on the capabilities of this technology in realization of devices used in communication systems at the mm-wave frequency. Novel devices based on this technology have been designed, fabricated and tested. The main goal of the thesis is realization of the whole RF front end of a communication system in Ka band based on this technology. So at first step, a ridge gap waveguide transmission line is evaluated and a transition from RGW to WR28 is realized. Then three novel filters based on RGW is designed and two of them are fabricated and tested. It is shown that the unloaded quality factors of these filters are higher than planar structures such as Microstrip line and Substrate Integrate Waveguides (SIW). Although the unloaded quality factor of the abovementioned filters is lower than rectangular waveguide competitors, the overall size of the filters is smaller. Easier direct integration capability of the designed filters to active devices can be considered as another useful advantages of the designed filter over rectangular waveguide filters. Power dividers/combiners based on the RGW technology are designed and realized too. Also, a fabrication simplification method using of the circular pins instead of the square pins is proposed and evaluated. For the first time, in this thesis an active device is integrated with a ridge gap waveguide directly without any dielectric interface. A substrate less power amplifier and an oscillator modules are designed and realized. The measured loss in the RF path of the amplifier is negligible and the measured data are in good agreements with datasheet. Designed devices in this thesis demonstrated the capability of the gap waveguide technology for realization of the whole RF front end of the communication systems in mm-wave frequencies
  9. Keywords:
  10. Millimeter Wave ; Power Amplifier ; Integration ; Novel Devices ; Ridg Gap Waveguide ; Substrate-Less Amplifier ; Substrate-Less Ocsillator

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