臺灣博碩士論文加值系統

本文發表一種結合洩漏模天線具有雙向接收/發射電磁波功能的無線電鑑別器. 所使用的天線操作在 11.9 GHz, 指向性為 20.4 dBi, 增益為 16.3 dB, 且 3-dB 頻寬為 (水平/垂直) 23/24. 在距離無線電鑑別器 2.5 公尺遠的地方接收調變後的信號, 我們得到解調後的信號和無線電鑑別器上的信號對應一致.

A battery-free radio frequency identification card which incorporates a dual-beam angle-diversity leaky-mode antenna is presented. The integrated antenna is operated at 11.9 GHz. and shows 20.4 dBi directivity, 16.3 dB gain, and 3-dB beamwidth of (Az/El) 23/24. By placing a horn antenna at 2.5 meters away for receiving the coded, modulated signals from the transponder, we obtain the demodulated signals matched identically to the coding signals at the transponder.

Chapter 1 Introduction--------------------------------------- 1
1.1 Introduction--------------------------------------------- 1
1.2 Organization of this Thesis------------------------------ 3
Chapter 2 Theoretical Analyses------------------------------ 5
2.1 Descriptions of RFID Systems----------------------------- 5
2.2 Angle-Diversity Microstrip Leaky-Mode Antenna Array------ 8
2.2.(a) Diversity Antennas----------------------------------- 8
2.2.(b) New Angle-Diversity Antenna:
the Leaky-Mode Approach-------------------------------------- 16
2.3 Power Divider/Combiner Section--------------------------- 26
2.4 Oscillator Specification--------------------------------- 30
Chapter 3 Measured Results and Discussions------------------ 31
3.1 Near-Field/Far-Field Methods----------------------------- 31
3.2 Gain Measurement----------------------------------------- 37
3.3 Up-Link Measurement-------------------------------------- 39
3.4 Bit Error Rate Measurement------------------------------- 43
Chapter 4 Conclusion---------------------------------------- 46
Reference---------------------------------------------------- 47

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