微波雙模環形濾波器與層疊式功率放大器的研究

Research on Microwave Dual-Mode Ring Filters and Stacked Power Amplifiers

雷明峰(Ming-Fong Lei)

指導教授 ： 王暉

國立臺灣大學/電機資訊學院/電信工程學研究所/博士(2007年)

https://doi.org/10.6342/NTU.2007.01741

摘要

本博士論文探討微波環形濾波器與功率放大器。
本論文將詳細地說明利用並聯電容的微小化雙模環形濾波器結構。電路分析說明這新的架構可以藉由增加並聯電容值以縮小雙模環形濾波器的尺寸，並且推導出設計公式。實驗結果於印刷電路板、低溫共燒陶瓷、與單晶砷化鎵基板上實現。這新形的濾波器結構尺寸小、可以設計成可調頻、並且可在毫米波頻段使用。
本論文並分析一個串聯輸入與串聯輸出的變壓器耦合層疊結構，用於功率放大器的功率合併應用。在層疊放大器，元件以串聯的方式層疊以合併功率，而不是傳統並聯方式。層疊的好處為輸入與輸出阻抗的提高，並且保持電流量不要太高；如此一來放大器可以容易地做匹配，並且在陣列系統中減少歐姆損耗。我們在 5 GHz 設計一個一瓦的四單元功率放大器以驗證本概念。我們也同時設計一版兩瓦的功率放大器，改進第一版的缺點。

關鍵字

環形濾波器 ； 疊層放大器

並列摘要

This doctoral dissertation investigates ring filters and power amplifiers in microwave and millimeter wave systems.
A miniature dual mode ring filter using shunt capacitances is described in detail in this dissertation. Circuit analysis shows that this new topology can reduce the size of the dual-mode ring filter by increasing the shunt capacitance values, and design equations are derived. Experiments are demonstrated on printed circuit board, LTCC, and monolithic GaAs substrate. This novel filter structure is small, can be made tunable, and is functional up to millimeter-wave frequencies.
A series-input and series-output transformer coupled stack is proposed as a power combining method for power amplifier designs. In a stack amplifier, the devices are stacked in series rather than in parallel for power combination. This has the advantages of increased input and output impedance, and also keeping the current at a relatively low level, allowing the amplifier to be easily matched, and reducing ohmic loss in array systems. A 1-W 4-cell power amplifier at 5 GHz using 2μm HBT is realized to demonstrate this concept. A 2-W power amplifier is also designed to improve the performance of the first design.

並列關鍵字

ring filter ； stacked amplifier

參考文獻

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