臺灣博碩士論文加值系統

本論文係依據普朗克黑體輻射定律，使用K 頻段輻射計量測物體產生之雜訊功率。第一章介紹輻射計基本原理，第二章敘述輻射計之天線及接收機中頻及射頻模組量測結果，並計算天線解析度及接收機等效雜訊溫度。第三章第一節敘述接收機連接 20 dB 導波管天線為一輻射計，量測 50 歐姆負載、吸收體、鋁板及人手之雜訊功率，並計算物體之雜訊溫度。第二節則敘述接收機連接 85 cm 碟形天線為一輻射計，並安裝於二維平面掃描器，量測 1.38 公尺距離之近場物體 18 公分 X 18 公分所計算之雜訊功率，量測數值經 Visual Basic 程式控制及量測，並以MATLAB程式顯示物體之成像，量測物體包含吸收體、20 dB 增益天線之輻射低功率以及發熱之陶瓷電阻。

In this thesis, a K-band radiometer is developed to measure the noise power coming from an object based on Plank’s blackbody radiation law. The basic radiometer theory is briefly introduced in Chapter 1. The measured results of a 85 cm dish antenna, IF and RF stages of a receiver are presented in Chapter 2 to give the antenna spatial resolution and receiver noise temperature. In Sec. 3.1 of Chapter 3, the receiver is connected with a 20 dB horn antenna as a radiometer to measure the noise power of four different objects to calculate their noise temperatures. In Sec. 3.2.2, a radiometer is developed to connect the receiver and a 85 cm dish antenna. The radiometer is mounted on a 18 cm x 18 cm scanner as a near-field imaging system to measure the noise power from the test object at 1.385 m distance. The recorded result and image are controlled through a personal computer using Visual Basic and MATLAB programs. The near-field imaging several objects includes a low-power antenna, absorber and heated ceramic resistors.

口試委員會審定書 #
中文摘要 i
Abstract ii
Table of Contents iii
List of Figures v
List of Tables viii
Chapter 1 Basic Theory 1
1.1 Brightness and Brightness Temperature 1
1.2 Equivalent Noise Temperature and Noise Figure 2
1.3 Antenna 5
1.3.1 Antenna Temperature 5
1.3.2 Spatial Resolution 7
1.4 Receiver 8
1.5 Detection and Integration 10
Chapter 2 Radiometer Measurements 12
2.1 Antenna Near-Field Measurement 12
2.2 Receiver Measurement 20
2.2.1 RF Stage 20
2.2.2 IF Stage 23
2.2.3 Receiver 26
Chapter 3 Noise Power and Near-Field Imaging Measurements 32
3.1 Noise Power Measurements 32
3.2 Near-Field Imaging Measurements 36
3.2.1 Cable behind LNA Case 39
3.2.2 Cable after LNA Case 42
Chapter 4 Conclusion 46
References 47
Appendices 49
1.1 Measurement Program Using Visual Basic 49
1.2 Imaging Program Using MATLAB 62

[1] A. Ishimaru, Electromagnetic Wave Propagation, Radiation, and Scattering, Englewood Cliffs, N.J.: Prentice Hall, ch. 17, sec. 3, pp. 513-516, 1991.
[2] D. M. Pozar, Microwave engineering, 4rd ed., Oxford, United Kingdom: John Wiley & Sons, ch.14, sec.4, 2012.
[3] J. D. Kraus, Radio Astronomy, New York: McGraw Hill, 1966.
[4] D. M. Pozar, Microwave Engineering, 4rd ed., Oxford, United Kingdom: John Wiley & Sons, ch.10, sec. 1 and sec.2, pp. 498-505, 2012.
[5] D. M. Pozar, Microwave Engineering, 4rd ed., Oxford, United Kingdom: John Wiley & Sons, ch.14, p. 669, 2012.
[6] C. H. Tseng, Development of ROCSAT-1 Ka-band Beacon Receiving Terminal, M.S. thesis, GICE, National Taiwan University, Taipei, Taiwan, 1996.
[7] "NSI 2000 Operating Manual," Nearfield Systems Inc., 2005.
[8] "Keysight PNA series network analyzers," Keysight Technologies Co., Santa Rosa, California, USA, pp. 4278, 2016. [Online] http://na.support.keysight.com/pna/help/pnahelp.pdf.
[9] Y. N. Chang, Measurement of a K-band Microwave Radiometer, M.S. thesis, GICE, National Taiwan University, Taipei, Taiwan, 2013.
[10] "High-accuracy noise figure measurements using the PNA-X series network analyzer," Agilent Technologies Inc., USA, 2013. [Online] http://cp.literature.agilent.com/litweb/pdf/5990-5800EN.pdf.
[11] "U2000 series USB power sensors operating and service guide," Keysight Technologies Co., Santa Rosa, California, USA, 2015. [Online] http://literature.cdn.keysight.com/litweb/pdf/U2000-90405.pdf?id=1239676.
[12] "Two-axis/four-axis stage controller SHOT-202 & SHOT-204MS user’s manual," Sigma Koki Co., Japan, 2008. [Online] https://www.global-optosigma.com/en_jp/software/motorize/manual_en/SHOT-202_204MS.pdf.