Bandwidth Enhancement of Broad-Band Cavity-Coupled Microstrip Vertical Transitions
碩士 === 國立暨南國際大學 === 電機工程學系 === 94 === Techniques to increase the bandwidth of broad-band cavity-coupled microstrip vertical transitions are described in this thesis. By varying the configurations of coupling slots and tuning stubs of the vertical transitions, a more than 30% increase in bandwidth ca...
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| Format: | Others |
| Language: | zh-TW |
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2006
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| Online Access: | http://ndltd.ncl.edu.tw/handle/50254727476167601744 |
| Summary: | 碩士 === 國立暨南國際大學 === 電機工程學系 === 94 === Techniques to increase the bandwidth of broad-band cavity-coupled microstrip vertical transitions are described in this thesis. By varying the configurations of coupling slots and tuning stubs of the vertical transitions, a more than 30% increase in bandwidth can be achieved. Besides the advantage of offering more bandwidth, another common feature of these designs is the size reduction in the longitudinal direction of the coupling slots and the tuning stubs in comparison with the rectangular coupling slots and the quarter-wavelength microstrip tuning stubs employed by the conventional designs. This characteristic is critical for modern microwave circuit designs requiring high density in circuit elements. The finite-element method was chosen to perform the required simulations for the proposed designs because of its accuracy for the structures described in this thesis. Both rectangular and circular cavity-coupled vertical transitions are under investigation. The validity of the simulation results has been assessed by measured data obtained from experiments. It demonstrates that the designs presented here can provide vary wide-band and low-insertion-loss vertical transitions.
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