| Summary: | 碩士 === 長庚大學 === 電機工程研究所 === 89 === Recently, because the information technology is growing rapidly, people have the more demand of conveying much data. So, the wireless communication system that has the advantage of being not limited by the time and space is growing more than before, for example, the growing of Bluetooth technology at present. Whereas. People will have more and more required in the real-time and stability of the information, and more portable communication equipment. For this reason, it is the important growing direction which we must to do that heightening Carrier Frequency﹑reducing the circuit size﹑cost down, and decreasing the research time.
In this thesis, we have designed and fabricated the 5.7GHz Image Rejection Mixer (IRM) by using Microwave Integrated Circuit (MIC) method and fabricated in Al2O3 substrate. In Radio Frequency (RF) coupler design, we used equivalent Lumped-Element technique to replace traditional transmission line design. It’s not only reducing the circuit size but also increasing the bandwidth respond. Similarly, in Intermediate Frequency (IF) we use the same method. It has many kinds of related architecture to design. But, in order to enhance the property of IRM’s isolation, we adopted a high pass equivalent topology to design RF coupler and low pass equivalent topology to design IF coupler. We selected the single-ended resistive mixer for IRM design because it has characteristic of low distortion, noise, and power consumption. Finally, we have obtained a well-designed image rejection mixer with low power, miniature and excellent isolation.
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