- 學位論文
2.45 GHz 主動旋轉器與被動雙功器之設計
Design of 2.45 GHz Active Circulator and Passive Diplexer
摘要
本論文著重於主動旋轉器隔離度提昇的探討。首先是對主動旋轉器包含類旋轉器做基本介紹，並以現有的被動電路元件與主動元件組合，同時維持插入損耗不至於過大，觀察隔離度的變化，找出隔離度無法提高以及頻寬過窄的缺點，並透過多次實驗加以改善。被動電路是採用FR4 微帶線，而主動元件是採用SGA-8343。 藉由撰寫的程式，可以初步預估運用相位相消的兩個訊號，在無法避免的大小及向位誤差，為了達到目標的隔離度，求出必須衰減的程度。再把這些架構，以多重組合的方式進行模擬，求出以數個主動旋轉器及類旋轉器提升隔離度的架構，比較改善程度，並預估未來在射頻積體電路製程可行的方式。 另外一方面，以FR4 微帶線，設計不同頻帶的帶通與帶拒濾波器，維持約3dB 的插入損耗下。搭配不同形式的濾波器，整合成一個雙工器。藉由主動旋轉器與被動雙工器的設計過程，同時探討單一頻率與雙頻帶，兩種不同的發射與接收模式，欲提昇隔離度方式的不同之處。
並列摘要
This thesis is to extract increase the isolation of active circulators. First, to introduce the theory of active circulators include quasi circulators, and produce them by active and passive circuits. The insertion loss of active circulators is to expect minimum. To observe the isolation of active circulators, find out the reasons the isolation is low and its bandwidth is too narrow and modify the characteristic by many experiments. Passive circuits are made by microstrip lines, and active circuits are consists of SGA-8343. The unbalanced amplitude of two signals used phase cancellation could be expected By VB programs. After VB programs computed, the attenuation of the two signals is known. Then, using multiple active or quasi circulators the new architecture increase the isolation will be found out. By comparing the isolation of single and multiple architecture, the feasibility of multiple architecture in MMIC technology will be expect. In the other hand, bandpass and bandstop filters will be design by microstrip lines, and its insertion loss is about 3dB. A diplexer will be consisted of different type filters. By the design procedures of active circulator and diplexer, the isolation of different transmitting and receiving modes, using single frequency and dual frequencies, will be discussed.