High population density and the presence of many more motorcycles than cars make the noise environment in Taiwan different from that in other countries. There is growing concern about the electromagnetic effects within this environment. The electromagnetic environment is unique and the information about radio noise is not sufficient at this time. The interference of wireless communication system may be caused by the noise environment. Thus, we need to consider the influence that the noise causes. With the measured radio noise, the minimum suggested receive power in an urban environment ranges from 354 MHz to 426 MHz. It is analyzed by the means of Cumulative Distribution Function (CDF), Amplitude Probability Distribution (APD), Noise Amplitude Distribution (NAD), Pulse Duration Distribution (PDD), Pulse Spacing Distribution (PSD) and Average Crossing Rate (ACR). We measured the properties of noise at an urban center, a nearby port, and a freeway exit, which are located in the same city, and on a hill lying adjacent to the city. We chose an urban center and a nearby hill as the noise environment for the following reasons: (a) The noise margin at urban areas is smaller than that at suburban and rural areas. (b) The coverage of the measurement on a hill is larger than that in a city. (c) The relation of the noise environment between a hill and an urban center can be obtained. The statistical distributions of the four particular noise environments are shown and design constraints for a broadcasting system are revealed.
Secondly, we also provide a technology for designing miniature Rogowski coils on glass substrates to obtain current sensors for high operating frequencies in this thesis. The coils are useful for measurement of a small current on a microstrip line at high frequencies. In our experiments, a 50 Ohm microstrip line is driven by an input voltage of 100 mV. A frequency as high as 6 GHz has been used. The highest frequency is limited by the oscilloscope available to us. Geometric effects of the device were investigated to obtain the sufficient output voltage at high frequencies. The induced output voltage can approach approximately 7 mV by modifying the structure of Rogowski coils. At the same time, On-chip solenoid inductors for high frequency magnetic integrated circuits are proposed. The eddy current loss was reduced by dividing the inductor into three consecutive inductors connected in series. The inductor has an inductance of 1.1 nH and the maximum quality factor (Qmax) of 50.5. The self-resonant frequency and the operating frequency at Qmax are greater than 17.5 GHz and 16.7 GHz, respectively.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-1013105-110012 |
| Date | 13 October 2005 |
| Creators | Chang, Ming-Hui |
| Contributors | Kin-Lu Wong, Ken-Huang Lin, Tzyy-Sheng Horng, Chih-Wen Kuo, Ann-Kuo Chu, Yu-De Lin, Jenn-Hwan Tarng |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1013105-110012 |
| Rights | not_available, Copyright information available at source archive |
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