本論文主要在研製射頻微波電路中，二次諧波混頻器與次諧波鏡頻抑制混頻器單石晶片。前兩章簡單介紹此篇論文的研究背景與基礎理論，第三章包含了三個改良式的次諧波混頻器，首先提出〈高隔離度寬頻次諧波升頻混頻器〉，是利用半循環器的各埠隔離特性，用以提高隔離度，量測的轉換損耗為16.1-19.3 dB，各埠的隔離度皆大於21.6 dB。〈23-40 GHz隔離度提升寬頻二次諧波混頻器〉，則是利用兩組藍吉耦合器與兩組放大器，有效提升次諧波混頻器的各埠隔離度與轉換増益，量測的轉換増益為6-12.5 dB，各埠的隔離度皆大於19 dB以上。最後提出的是〈7.5-20.5 GHz離散式寬頻二次諧波混頻器〉，主要利用離散式架構來解決主動混頻器頻寬不足的問題，量測的轉換損耗為9.1-13 dB，所有埠之間的隔離度皆大於23.5 dB。第四章則利用一個具有IF抽取特性的帶通濾波器，以縮減電路面積的〈20-31 GHz二次諧波鏡頻抑制混頻器〉，轉換損耗在次諧波混頻與一次諧波混頻下，量測值分別為15.5-18.5 dB與14.6-17.6 dB，最大鏡頻抑制率分別為33 dB與22 dB，各埠間的隔離度也都大於23 dB。附錄為一個被動電路與偏壓電路結合以節省面積的〈18-38 GHz寬頻倍頻器〉，量測得轉換損耗為0.5-5 dB，最大基頻抑制為18 dB。

The implementation of Sub-harmonic mixers in MMIC Ku/Ka-band applications is presented. The broadband sub-harmonic up-conversion mixer exhibits a high isolation, which enhances the isolation by inserting the quasi-circulator in front of the mixer core. The measured conversion loss ranges from 16.1-19.3 dB, and all the measured isolations are higher than 21.6 dB over a wide band width of 15-27 GHz. In the 23-40 GHz isolation-enhanced broadband sub-harmonic mixer, conversion gain and isolation can be enhanced by employing the couplers and amplifiers. The measured conversion gain is between 6-12.5 dB, and all the isolations are higher than 19 dB. The 7.5-20.5 GHz distributed broadband sub-harmonic mixer is more suitable in extending bandwidth in active sub-harmonic mixers that are typically narrower than passive sub-harmonic mixers. This is accomplished by utilizing the distributed topology. The measured conversion loss is between 9.1-13 dB, and the measured isolations are all higher than 23.5 dB. The fourth chapter presents the fabrication of a 20-31 GHz sub-harmonic image rejection mixer. The measured conversion loss is from 15.5-18.5 dB and 14.6-17.6 dB in subharmonic and fundamental mixers, respectively. The best IRR exhibited in the subharmonic and fundamental mixers is 33 dB and 22 dB, respectively. The isolations are all higher than 23 dB. The Appendix shows the design of an 9-19GHz broadband doubler. The chip size can be reduced by combining bias circuits and balun circuits, and using a new band pass filter with IF extraction. The measured conversion loss is between 0.5-5 dB, and the highest fundamental rejection ratio is 18 dB.

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