瞿大雄臺灣大學：電信工程學研究所黃聖荃Huang, Shen-ChuanShen-ChuanHuang2007-11-272018-07-052007-11-272018-07-052007http://ntur.lib.ntu.edu.tw//handle/246246/58954摘要 本論文敘述使用三天線法及多天線法,分別量測天線增益與相位中心,並利用於不同天線距離所量測到的S參數,計算發射與接收天線間的路徑長度。藉由三天線法與反射式RCS量測,可證明天線相位中心位置為頻率函數,並可利用不同距離所量測到之S21參數,求出發射天線與接收天線間的距離,以提高三天線法量測天線增益的準確度。本論文進而建立多天線法,可同時獲得多個測試天線之增益及相位中心,並由量測數據討論增益之精準度。Abstract In this thesis, the antenna gain and phase center are calculated from a set of S21 measurements at two different distances using the three-antenna method and the multi-antenna method. By using the three-antenna method and the S21 measurement in a reflection-type RCS arrangement, the phase center of antenna is measured and verified as a frequency dependent value. In addition, the path lengths between the transmitting and receiving antennas can be calculated from a set of S21 measurements, the measured antenna gain using three-antenna method given in Chapter 4 is shown to be accurate and distance independent. The approach of multi-antenna method is then presented in Chapter 5 with experimental results to measure the antenna gain and phase center of the test antennas in a cost-effective manner.Contents Chapter 1 Introduction 1 1.1 Motivation and literature survey…………………..……………………….. 1 1.2 Basic formulation…………………………………………………..………..1 1.2.1 Friis formula……………………………………….………………….1 1.2.2 Radar equation……..………………………………………..………...3 1.3 Thesis outline………………………………………………………………. 5 Chapter 2 Antenna gain measurement based on three-antenna method 9 2.1 Formulation……………………………………………………………….... 9 2.2 Experiment and verification……………………………………………….13 2.2.1 Measurement arrangement…………………………………………...13 2.2.2 Measurement results and verification………………………………..13 2.2.3 Result accuracy………………………………………………………18 2.3 Summary.......................................................................................................23 Chapter 3 Path length measurement based on RCS 25 3.1 Formulation………………………………………………………………..25 3.2 Experiment and verification……………………………………………….27 3.2.1 Measurement arrangement…………………………………………..27 3.2.2 Measurement results and verification……………………………….31 3.2.3 Result accuracy………………………………………………………34 3.3 Summary…………………………………………………………………...34 Chapter 4 Antenna gain and phase center measurements based on three-antenna method 37 4.1 Formulation……………………………………………………………...37 4.2 Experiment and verification………………………………….…………43 4.2.1 Measurement arrangement……………………………………….. 43 4.2.2 Measurement results and verification….…….………………….…46 4.2.3 Result accuracy…….………………………………………………51 4.4 Summary .……………………………………………………………...52 Chapter 5 Antenna gain and phase center measurements based on multi-antenna Method 57 5.1 Formulation………………………………..…..………………………57 5.2 Experiment and verification…………….……………………………..68 5.2.1 Measurement arrangement………………….……………………68 5.2.2 Measurement results and verification …………………..………..71 5.2.3 Result accuracy…………………………………………………..89 5.4 Summary………………………………………………………………89 Chapter 6 Conclusion 91 References ……………………………………………………………………93 Appendix A Linearly polarized broadband antenna A 6100 ……………95 Appendix B Linearly polarized broadband antenna EMC-3115 ……… 97 Appendix C Linearly polarized broadband antenna DRH-0118 ………100 Appendix D Linearly polarized X band horn antenna …………………102 Appendix E Antenna fixture …………………………………………… 1033004391 bytesapplication/pdfen-US天線天線量測天線增益相位中心antenna gainphase centermulti-antenna methodthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/58954/1/ntu-96-R94942062-1.pdf