使用PIN二極體之可調耦合量耦合器與轉換開關

Coupling Level Adjustable Couplers and Transfer Switches Using PIN Diodes

王盈淳(Ying-Chun Wang)

指導教授 ： 張志揚

國立交通大學/電機學院/電信工程系所/碩士(2018年)

摘要

本論文提出一寬頻可調耦合量耦合器，以使用PIN二極體當開關之對稱反射網路與90度混成器合成設計，符合前向波耦合器理論，由於其架構有對稱性，因此適用奇偶模電路拆分法，而對稱反射網路之奇偶模反射相角差可以決定前向波耦合器之耦合量。對稱反射網路為兩條傳輸線並聯，透過改變PIN二極體的偏壓可以切換不同的耦合量，並以此方式為基礎設計轉換開關。實作方面，此報告開發1-2GHz的寬頻可調耦合量之耦合器及轉換開關器，並分別以三種不同的90度混成器進行合成，可調範圍分別為-0.65到-19dB，反射損失與隔離度有很好的表現，而轉換開關的射損失與隔離度也有很好的表現，實作使用厚度0.5mm的RO4003基板，其量測與模擬結果相當符合。

關鍵字

90度前向耦合器 ； 3dB 混成耦合器 ； PIN二極體 ； 轉換開關 ； 可調耦合量耦合器

並列摘要

In this thesis, coupling level adjustable coupler is proposed based on symmetric reflecting networks and 90° hybrid couplers. Because of the symmetric of this structure, the conventional even-odd mode partition and corresponding analysis method can be applied as a forward-wave coupler. The PIN diode based symmetric reflecting network changes the reflection phase difference between the even- and odd-mode circuits of the proposed coupler and leads to the variable coupling ratio. The PIN diodes in the symmetric reflecting network with two different bias voltages and two difference transmission lines can achieve four modes of tunable coupling ratio and operation bandwidth. Transfer switches can be obtained with the same method. Example circuit covers 1-2 GHz. The input return loss and isolation can be kept in good performance across the designed band. The coupling ratio of the coupler is tuning from -0.65dB to -19dB. The prototype circuit is fabricated on a 0.5mm-thick RO4003 substrate to demonstrate the proposed wide band tunable coupler.

並列關鍵字

90 degree forward coupler ； 3dB hybrid couplers ； PIN diodes ； transfer switches ； coupling level adjustable couplers

參考文獻

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