| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 101 === This thesis proposes three types of transitions between different substrates, applied separately for 77GHz automotive collision avoidance radar systems and 60GHz wireless communication systems. The 77GHz automotive collision avoidance radar system is developed using LTCC and Teflon substrates, while 60GHz wireless communication system is realized in two different printed circuit boards. The transitions are all designed with flip-chip structures.
The first design adopts the traditional flip-chip structure, with the microstrip lines on the substrates directly connected by bumps. Using the idea of locally matching, the method achieves a wideband transition with about 1 dB insertion loss. The second type of transition is designed by the concept of the microstrirp coupled-resonator filter. The microstirp resonators are located on the two types of substrates, while the transition is implemented by the vertically coupling with the coupling coefficients according to the design specification. The third transition is developed by substrate integrated waveguide and the side walls of the cavities are realized by vias. There are three cavities: two different substrates implement two cavities resonators, respectively, while the air between two substrates forms the third resonator. A 3rd-order Chebyshev bandpass response is chosen to validate the design concept, using slots between the cavities as the coupled mechanism. The design further decreases the loss by using the high-Q cavity resonators. Since the design combines transitions and the filter function using the coupled-resonator concept, it can achieve the filtering responses and decrease the overall loss of the system.
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