使用LTCC製程及離散電晶體實現之主動分工器

Active diplexer implemented by using LTCC process and discrete transistors.

黃宏碩(Hung-Shuo Huang)

指導教授 ： 盧信嘉教授

國立臺灣大學/電機資訊學院/電子工程學研究所/碩士(2011年)

https://doi.org/10.6342/NTU.2011.03165

摘要

本論文實現了一個使用混合左右手傳輸線的主動式分工器(active diplexer)。藉由控制閘極線以及汲極線之間相位變化，使前向以及反向輸出端兩者在不同頻段下分別為放大與消去的特性，而這樣的特性因與收發電路中的被動式分工器特性類似，所以我們稱之為主動式分工器。
我們透過數學式分析求得最佳解，最後經由傳輸線相位設計驗證我們的假設並將被動電路實現在低溫共燒多層陶瓷(low temperature co-fired ceramic, LTCC)製程上，並透過表面黏著技術(surface mount technology, SMT)，將製造商NEC所製作之異質場效電晶體(hetero junction field effect transistor, HJ-FET)貼附在LTCC基板上，藉此達到主動分工器之電路架構，本電路設計分頻的頻率為2.4GHz以及5.2GHz。

關鍵字

分佈式放大器 ； 分工器 ； 混合左右手傳輸線

並列摘要

This thesis realized an active diplexer using composite left/right-handed transmission line. By controlling the phase shift between gate line and drain line, we can have cancellation in forward output port and amplification in backward output port at lower frequency and the opposite characteristic at higher frequency. Because its characteristic is similar to passive diplexer in the front-end of a transceiver system, it is called an active diplexer.
We find the possible solutions based on mathematical analysis. By controlling the phase of transmission lines at gate and drain, we can control the frequency of maximum gain at forward and backward direction. We implement passive elements in LTCC process and using HJFET transistors NE3512S02 from NEC. The active diplexer is designed to work at 2.4GHz and 5.2GHz
Keyword: distributed amplifier, diplexer, composite left/right-handed transmission line.

並列關鍵字

distributed amplifier ； diplexer ； composite left/right-handed transmission line

參考文獻

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[5] C. Caloz and T. Itoh, “Transmission line approach of left-handed (LH) materials and microstrip implementation of an artificial LH transmission line,” IEEE Transactions on Antenna and Propagation, vol. 52, issue 5, pp. 1159 – 1166, May 2004.

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