高頻傳導雜訊抑制的功率吸收層設計與分析

Design and Analysis of Power Absorption Films for High-Frequency Conduction Noise Suppression

徐仲彥(Chung-Yen Hsu)

指導教授 ： 陳立軒

義守大學/智慧科技學院/電子工程學系/博士(2022年)

摘要

消耗性電子裝備如穿戴式裝備、手機或偵測裝置等，均以輕、薄、短、小，為設計主流。其中又以高頻段為設計範圍，但往往容易受到外部訊號的干擾，導致電子元件的損壞或接收訊號異常，因此防止外部訊號的干擾，為工程師或學者們的研究方向。利用微帶線設計高頻段濾波器，具有簡便和製造容易的優點，但是在中心頻率的倍頻處，會伴隨產生諧波項或稱為虛假響應，有相當多的學者探討如何消除諧波項，傳統的解決方式是設計微帶線濾波器抑制虛假響應。本研究是藉助微波吸波物質抑制高頻諧波，當電磁波進入至吸波物質時，根據電磁波的「馬克斯威爾方程式」及「邊界條件」，電磁波能在物質內產生共振現象，亦即入射電磁波能量藉由共振轉換為熱能損耗。以高頻電路的觀點而言，微波吸波物質可以視為一低通濾波器，可以消除濾波器的高頻諧波項；此種設計方式具有快速、製作簡便及低成本等優點，同時可以有非常高的諧波抑制頻寬。本論文探討不同材料的「導電率」及「厚度」來分析功率吸波薄片結構，以不同厚度及圖形為設計理念；利用不同的厚度來達成雜訊抑制的目的；藉由3D列印堆疊方式，將吸波材料堆疊於不同位置上，並探討其對於雜訊抑制之高頻表現，本研究同時利用PI型等效電路，分析高頻訊號抑制特性，藉由PI型等效電路闡述雜訊抑制現象。

關鍵字

無

並列摘要

High-frequency microstrip line (MSL) filters have the advantages of design simplicity and ease of manufacturing. However, harmonics or spurious responses occur at multiples of the center frequency. Several researches focusing on ways to eliminate the harmonic terms have been conducted. Traditional solutions include suppressing high-frequency harmonics in MSL filters. In this paper, the high-frequency harmonics were suppressed using absorbing materials. When electromagnetic (EM) waves were incident on the absorbing materials, the EM waves resonated in the absorbing materials according to "Maxwell's Equations" and "boundary conditions" of the EM waves. The incident EM wave energy was converted into heat energy via resonance. The spin coating and 3D printing process were adopted to prepare the absorbing layers. The effect of conductivity of materials and patterns and thickness of the absorbing layers on the performance of noise suppression has been investigated. Furthermore, PI type equivalent circuit was proposed for studying the effect of the layers on power absorption.

並列關鍵字

none

參考文獻

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