K-band Radiometer Measurement and Near-Field Imaging
| Autor: | Yu-Tun Tsai, 蔡昱墩 |
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| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 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. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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