臺灣博碩士論文加值系統

本論文38GHz 研究寬頻多指向器印刷式八木天線，並組合成一個十六元素的天線陣列。還有更進一步的討論整單一天線的各種尺寸參數對天線輻射和輸入阻抗的影響。這些參數包括指向器間的距離、指向器的長度、接地面寬度對輻射的影響，動偶極天線對頻寬的影響。根據這些研究結果，可以將天線的輻射圖騰最佳化。對於如何在各種不種介質板上設計出不同的八木天線，我們提出一套設計程序。根據這個設計程序，可以快速且簡單的在不同的介質板上實現八木天線，且擁有不錯的輻射特性。
完成的單一八木天線擁有11dBi的增益、28％優異的頻寬、旁波束低於-13dB。而完成的八木天線陣列實現16dBi的增益、30％的頻寬、3.8度的極窄半功率波束寬度。

This thesis designs a 38 GHz wideband printed Yagi antenna with multiple directors and a linear sixteen-element Yagi antenna array. The influences of antenna’s variety parameters on radiation pattern and input impedance have been discussed. These parameters include the inter-director spacing, director-length arrangement, the effect of truncated ground plane and the width of active dipole. Based on these research results, the antenna radiation pattern can be optimized. Finally, we offer a simplified design procedure to realize Yagi antennas on distinct substrates. By this procedure, Yagi antennas on distinct substrates can be fabricated quickly and easily and the finished antenna patterns are moderate.
The single Yagi antenna achieves excellent performance, fairly high gain of 11 dBi, broad bandwidth of 28%, and low side-lobe level of —13 dB. The linear sixteen-element Yagi array owns a gain of 16 dB, bandwidth of 30%, and extreme narrow beamwidth of 3.8°

CONTENT
ABSTRACT (CHINESE) …………………………………………………i
ABSTRACT ………………………………………………………………ii
ACKNOWLEDGEMENTS ………………………………………………….iii
CONTENTS … ………………………………………………………….iv
LIST OF FIGURE …………………………………………………………v
CHAPTER 1 : INTRUDUCTION …………………………………………1
CHAPTER 2 : DESIGN AND MEAUREMENT OF SIGNAL YAGI ANTENNA
2.1 Signal printed Yagi antenna desige ……………………4
2.1.1 Antenna gain versus total number of directors
…………………………………………………………4
2.1.2 Director arrangement ………………………….5
2.1.3 Width of active dipole versus broadband ……6
2.2 Measurement of signal printed Yagi antenna ………7
2.3 Effect of truncated ground plane ……………………8
CHAPTER 3 : SIMPLIFIED DESIGN PROCEDURE TO RE-DESIGN ANTENNA
ON DISTINCT DIELECTRICS
3.1 Simplified Design Procedure on Distinct Dielectrics
…………………………………………………………………20
3.2 Mutual Coupling on Distinct Dielectrics …………22
CHAPTER 4 : DEIGN AND MEASUREMENT OF 38 GHz YAGI ARRAY
4.1 Array design …………………………………………….28
4.2 Power divider and Feed Network Design ……………28
4.3 Array measurement ………………………………………29
CHAPTER 5 : CONCLUSIONS …………………………………………36
REFERENCE ……………………………………………………………38

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