壓電極子發射與接收電磁波的研究

Electromagnetic Radiation and Reception Characteristics of Piezoelectric Polariton

林子揚(Tzu-Yang Lin)

指導教授 ： 周元昉

國立臺灣大學/工學院/機械工程學研究所/碩士(2017年)

https://doi.org/10.6342/NTU201700870

摘要

週期性結構之特殊性質，在過往研究中皆有許多人討論，經由壓電之特性配合週期性變化，使電磁統御方程式與牛頓第二運動定律相互作用，讓電磁波與機械波在壓電材料中耦合。其應用於現代科技中，隨著行動通訊的崛起，天線種類各式各樣，但以週期性調變的壓電材料來做為電磁波信號的收發裝置，還曾未有人多加著墨於此。
本文以不同於以往的天線材料來實現天線的微型化，透過週期極化之鈮酸鋰材料作為電磁波收發裝置，至今無人嘗試，希望能擺脫了天線以往厚重的線圈型態，以輕盈的晶片大幅縮小了天線的尺寸體積。
週期極化鈮酸鋰簡稱PPLN，具有接收與輻射電磁波之物理性質。內部的波傳行為同時具有電磁波與機械波。本文探討347.6MHz的頻率激發晶體內部之波傳行為所呈現出電磁波的收發特性，藉此作為新型微型化天線之關鍵理論。
本文成功製作出週期為 之鈮酸鋰晶片。並且詳細探討小週期結構之鈮酸鋰極化之製程，透過前人理論推導將鈮酸鋰內部之波傳行為有一詳細描述，將以此作為實驗參考對照之依據，加以探討其收發輻射電磁波時，其PPLN內部之能量情形。

關鍵字

週期極化鈮酸鋰 ； 天線 ； 壓電超晶格 ； 極子

並列摘要

There have been many researches which focused on the particular characteristics of the periodic structures. Through the characteristics of the piezoelectric with the periodic changes in structure causes the mutual effect between the electromagnetic governing equation and Newton's second law of motion to interact with each other to make it couple electromagnetic waves and mechanical waves in the piezoelectric material. Applied it into the modern technology arising with the mobile communication, there is wide variety of the antenna, which also mean that Antenna plays an important role. However, not so many researches about the transmitter device about the electronic signals based on the periodic structures.
In the article, it is totally different than used to be. Miniaturizing the antenna with a novel idea and new material has been tried. By using periodically poled Lithium Niobate as an electromagnetic wave transceiver, which hasn’t been tried before, we proposed a new tech of miniaturized and abandoned the conventional antenna which are composed by coil.
Periodically Poled Lithium Niobate, abbreviated as PPLN, possess the ability of receiving and transmitting physical characteristic of the electromagnetic wave. The inner wave propagation contains both of the electromagnetic and mechanical wave in the meanwhile, which is the key characteristic of achieving miniaturization. And which is used as the key theory to be the miniature of the antenna
In this article, we focus on the frequency 347.6MHz, and successfully created the correspondence in the PPLN. By comparing with previous researches about its inside wave propagation and using the detailed description by the elder, we concluded a detailed discussion about its electromagnetic wave receiving and transmitting performance and used it as a comparison to discuss.

並列關鍵字

PPLN ； Antenna ； Piezoelectric Superlattice ； Polarition

參考文獻

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