包含整合微帶天線之新型單平衡自振式混頻器及其設計

Abstract

本論文提出一包含整合平面微帶天線之新型單平衡自振式混波器，並在5.9GHz附近予以驗證。電路架構主要包含雙迴路振盪器、三阜180度孔隙微帶天線混合器、中頻網路及三阜耦合功率分配器。雙迴路振盪器利用共同路徑，產生交互注入鎖定使振盪頻率及相位造成同步。三阜180度孔隙微帶天線混合器是信號的輸出端，同時也是功率分配器的功能。微帶天線的架構抑制本地振盪信號的輻射，但卻是射頻信號的出入端。最後我們得到同相輸出，頻率5.73GHz，功率8dBm的本地信號源，以及單平衡式混波特性的混波器，而完成單平衡自振式混波器。

A new configuration of the balanced self-oscillating mixer with integrated antenna is proposed and demonstrated at 5.9 GHz. The structure is mainly composed of a IF feed network and two loop oscillators using two amplifiers, a three-port 180° slot-coupled microstrip antenna, and a 3-db power divider. The two oscillator loops share a common segment, which provides a path for mutual injection between the oscillators, leading to the synchronization of the oscillation frequency and phase. The three-port antenna performs both the functions of radiation and wilkinson power division. It rejects the LO signals but lets going the RF signals. The measurement results show that the oscillation signals are mutually locked at the frequency of 5.73 GHz with a power level of 8 dBm. Also the results show that mixer performs like a single balanced mixer.