ㄧ種改良式電磁能隙結構及其應用

An Improved Electromagnetic Band-gap Structure with Applications

林保君(Pao-Chun Lin)

指導教授 ： 黃建彰

元智大學/電機通訊學院/通訊工程學系/碩士(2007年)

摘要

本論文提出ㄧ種全新改良式電磁能隙結構，可在低損耗的情形下產生較大的慢波因子以縮小微波電路，並且擁有寬頻帶的能隙效果，在文章中提出ㄧ系列控制結構參數的方法，以提升能隙頻寬與慢波因子大小。在與微波電路結合的應用方面，除了傳統環形分合波器小型化之應用之外，並且結合一帶通濾波器應用於WiMAX，藉由新型能隙結構的寬頻帶止效應抑制高階倍頻，形成寬頻帶止效應之帶通濾波器。最後提出ㄧ主動電路後級匹配與電磁能隙結構結合的概念方法，有效的抑制功率放大器之二階與三階諧波項，提升其線性度與ㄧ階增益壓縮點。

關鍵字

光子晶體 ； 電磁能隙結構 ； 濾波器 ； 環形分波器 ； 六角形電磁能隙結構 ； 慢波結構 ； 慢波因子

並列摘要

This thesis presents an improved electromagnetic band-gap structure which has the ability of reducing the RF circuitry sizes in low loss conditions due to the larger slow wave factor and broad band-gap characteristics. Several parameter tunings on the structure dimensions for improving the energy band-gap and the slow wave factor are discussed in detail in the thesis. In the application aspects, the miniature ring hybrid is demonstrated at the first, and then the microstrip bandpass filter with wide spurious suppression for WiMAX systems using the proposed structure is examined. Finally, the basic concept utilizing the electromagnetic band-gap structure on the output matching in active devices is addressed for enhancing circuit linearities and 1 dB compression point.

並列關鍵字

Photonic band-gap ； Electromagnetic band-gap ； Hexagon ； Improved hexagon ； Slow wave structure ； Slow wave factor

參考文獻

[1] E. Yablonovitch, “Inhibited Spontaneous Emission in

Solid-State Physics and Electronics,” Physical Review

[2] S. John, “Strong Localization of Photons in Certain

2-D Photonic Bandgap Structure for Microstrip Lines,”

IEEE Microwave Guided Wave Lett., vol. 8, no. 2, pp.