隧道內低頻電波傳播暨應用於WiMAX之天線設計

Low frequency propagation inside tunnel environments and Antenna Design for WiMAX Applications

許曜贊(Yao-Tsan Hsu)

指導教授 ： 周錫增

元智大學/工程學院/通訊工程學系/碩士(2006年)

https://doi.org/10.6838/YZU.2006.00154

摘要

中文摘要
電磁脈衝波（Electromagnetic Pulse，簡稱EMP）能在極短的時間內，以電磁波的形式，將非常大之能量由爆炸點傳播至遠處，在傳遞過程中，電磁脈衝波會對電子設備產生極嚴重的破壞，本文主要從事電磁脈衝波屏蔽防護為主的研究。本研究我們採用電磁數值模擬技術尤以貫量法(Method of Moment，MoM）來進行模擬分析，進行方式有二，其一為觀察一根Dipole天線在各種隧道狀之金屬空腔中之電磁場及其空腔之屏蔽效應（Shielding Effectiveness，SE）隨頻率的變化（10MHz~70MHz）。此金屬空腔可為防護飛機或飛彈架構之屏蔽體，因此其屏蔽效應可做為預估飛彈或飛機在此屏蔽架構下之損害參考；其二為探討EMP波藉由飛彈或飛機之機體存在之空腔之波導效果來探討電子系統之損害評估。此兩者研究得用以討論飛彈和飛機在EMP環境下之損害的整體評估。
本論文另一主題是設計WiMAX天線，去因應目前最熱門的通訊系統之ㄧ∼WiMAX所設計的天線，由於此通訊系統具有高傳輸速率與涵蓋範圍廣的特色，所以符合其特色的天線必須具備寬頻及高增益的特性。而本研究主要設計家用的WiMAX天線，其符合的頻段要在2.5GHz∼2.69GHz、3.5GHz∼3.7GHz和5.2GHz∼5.8GHz這三頻段。

關鍵字

電磁脈衝 ； 隧道 ； 對數週期天線 ； 八木天線

並列摘要

ABSTRACT
The electromagnetic pulse wave（EMP）can be in the form of electromagnetic wave to propagate very high energy from demolition point to far distant in an extremely short time. During the propagation, the electronic equipment was seriously destroyed for the electromagnetic wave. The research is studying in the electromagnetic pulse wave shielded and protected protection. The Method of Moment to analyzed in this research. There are two kinds of process, First, observing the shielding effect of nearing magnetic field which is excited by a Dipole antenna in various kinds of tunnel form metallic cavities. The observing frequency range is from 10MHz to 70MHz. This metallic cavity can be regarded as the shielding body which is protect the aircraft or the missile structure. So, its shielding effect can be regarded as guidline to estimate the destruction for the aircraft or the missile in this shielding structure. The second, to discuss the EMP wave and the destruction of electronic system for the waveguide effect of the cavity where the aircraft or the missile within. The two studies are to estimated impact of the aircraft or the missile in the EMP environment.
The other topic of the thesis is to design WiMAX antenna. To accord with one of the popular communication system ~WiMAX. Due to this communication system has the characteristics which are high transfer rate and wide cover range, the antenna which accords with WiMAX characteristics must possess wide band and high gain characteristics. The research is mainly to design WiMAX antenna which is used to home. It’s frequency bands are from 2.5GHz to 2.69GHz, from 3.5GHz to 3.7GHz and from 5.2GHz to 5.8GHz.

並列關鍵字

EMP ； tunnel ； log periodic dipole array:Yagi-Uda antenna

參考文獻

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