DESIGN AND ANALYSIS OF BROADBAND ACTIVE ANTENNA 柯承志、林漢年
E-mail: [email protected]
ABSTRACT
DUE TO THE TREND OF FASTER SPEED AND HIGHER FREQUENCY DEMANDS ON ELECTRONIC AND TELECOMM -UNICATION SYSTEMS, THERE IS AN INCREASING PROBLEM FOR THE ELECTROMAGNETIC COMPATIBILITY ( EMC) AND ALSO THE TROUBLE ON THE MEASURING ELECTROMAGNETIC
INTERFERENCE SIGNALS.THE MEASUR -EMENT PROBLEM AROSE FROM THE NATURE OF CABLE LOSS IN THE HIGH FREQUENCY RANGES(GREATER TH -AN GHZ). BECAUSE THE STRENGTH OF RECEIVED SIGNAL ATTENUATES RAPIDLY ALONG THE CABLE BETWE -EN THE RECEIVING ANTENNA AND RECEIVER,IT IS DIFFICULT AND IMPRACTICAL TO DETECT AND ANALY -ZE THE HIGH FREQUENCY SIGNAL(EVEN INSTALL AN PRE-AMPLIFIER IN FRONT OF RECEIVER).THE THES -IS INVESTIGATES THE DESIGN OF BROADBAND ACTIVE ANTENNA WITH MODERATE GAIN OVER THE FREQUE -NCY RANGE 1GHZ GHZ, AND THUS TO SOLVE THE MEASUREMENT PROBLEM FOR HIGH FREQUENCY EMI AND RF TESTS. THE WORKS OF THE THESIS IS FIRST TO IMPLEMENT THE S-PARAMETERS OF AMPLIFIER MODU -LE FROM MANUFACTURER (MINI-CIRCUIT),THEN USE THE MICROWAVE AMPLIFIER DESIGN PRINCIPLES AN -D UTILIZE THE
MICROWAVE CIRCUIT DESIGN SOFTWARE (MICROWAVE OFFICE 2000) TO SIMULATE AND A -NALYZE THE LOW NOISE AMPLIFIER (LNA), FINALLY USE THE LUMP ELEMENTS AND MICROSTRIP LINES TO MATCH THE IMPEDANCES, AND THEREFORE FINE-TUNE THE LNA PERFORMANCE ON THE PRINTED CIRCUI -T BOARD (FR4). AFTER THE LNA CIRCUIT IS FINISHED, IT IS MOUNTED ON THE DEDICATED HORN ANT -ENNA TO MEASURE THE S-PARAMETERS AND ANTENNA PATTERNS OF THE INTEGRATED ACTIVE ANTENNA SY -STEM. THE SYSTEM MEASUREMENT IS CONDUCTED IN THE CSIST AND PROVED TO BE EFFECTIVE FOR THE HIGH FREQUENCY MEASUREMENTS.
Keywords : EMC ; EMI ; RF ; Lump Element ; Microstrip Line
Table of Contents
第一章 緒論--P1 1.1研究動機--P1 1.2研究方法--P2 1.3 論文架構--P2 第二章 基本理論--P4 2.1 S參數在雙埠網路的特性--P4 2.2阻抗匹配--P8 2.2.1集總元件阻抗匹配電路--P10 2.2.2微帶線阻抗匹配--P11 2.3增益方程式之表示--P13 2.3.1利用信號流程 圖求得增益方程--P13 2.3.2直接以S參數求得增益方程式--P17 2.4放大器之穩定性--P20 2.5雙埠網路的雜訊--P26 第四章 模擬 分析--P31 3.1單級放大器之模擬分析--P31 3.2雙級放大器之模擬分析--P36 第四章 量測結果--P42 4.1微波放大器的量測--P42 4.1.1單級放大器之量測--P42 4.1.2雙級放大器之量測--P49 4.2號角天線的量測--P56 第五章 結論--P67 參考文獻--P68 附錄A 傳輸線方程式--P70 附錄B微帶傳輸線公式--P72
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