臺灣博碩士論文加值系統

本論文研究目標為設計一個能收集Wi-Fi頻段(2.45/5.25 GHz)射頻能量的小型化雙頻整流天線，接收天線收集雙頻段的射頻能量後輸入整流電路轉換成直流電能。
本文所設計之接收天線的饋入方式為共面波導，使用的基板之材質是透明膠片，調整天線矩形輻射金屬面上的兩個缺口之寬度來達到目標頻段。實際量測接收天線，當頻率為2.45 GHz時S11值是 -14.3 dB，低頻段的頻寬為2.01 ~ 2.85 GHz；當頻率為5.25 GHz時S11值是 -17.6 dB，高頻段的頻寬為4.59 ~ 6.06 GHz。
將本文的整流電路設計並製作在FR4玻璃纖維板上。因為採用雙枝節匹配網路的設計結構將目標頻段2.45/5.25 GHz的輸入阻抗匹配至50 Ω，使單整流電路就可以轉換雙頻段的射頻能量以縮小整體尺寸。實際量測整流電路，當輸入功率為0 dBm時，頻率為2.45 GHz的轉換效率是30.36 %，而頻率為5.25 GHz的轉換效率則是13.69 %。實際量測整流天線，當輸入功率為 -20 dBm時，兩頻段2.45/5.25 GHz的轉換效率分別是6.25/1.44 %。

This thesis targets the design of a miniaturized dual-band rectenna that can collect radio frequency energy in the Wi-Fi band (2.45/5.25 GHz). The receiving antenna collects the radio frequency energy in the dual frequency band and then inputs it to the rectifier circuit, which converts the radio frequency energy into direct current electricity.
The feeding method used in the receiving antenna design in this article is a coplanar waveguide, and the substrate material used is transparent. Adjusting the width of the two notches on the rectangular metal surface of the antenna can effectively excite resonance within the target frequency band. Measuring the receiving antenna, where the frequency is 2.45/5.25 GHz, the value of S_11 is -14.3/-17.6 dB, and the bandwidth is 2.01 ~ 2.85 and 4.59 ~ 6.06 GHz.
The rectifier circuit in this article was designed and fabricated on an FR4 glass fiber board. Because the use of a double-stub impedance matching network design structure matches the input impedance of the target frequency band of 2.45/5.25 GHz to 50 Ω, a single rectifier circuit can convert dual-band radio frequency energy to reduce the overall size. Measuring the rectifier circuit, when the input power is 0 dBm, the conversion efficiency at a frequency of 2.45/5.25 GHz is 30.36/13.69 %. Measuring the rectenna, when the input power is -20 dBm, the conversion efficiency at a frequency of 2.45/5.25 GHz is 6.25/1.44 %.

摘要........................... i
Abstract....................... ii
誌謝........................... iv
目錄........................... v
表目錄.......................... vi
圖目錄.......................... vii
第一章 緒論..................... 1
第二章 文獻探討.................. 3
第三章 基礎理論.................. 8
3.1 回波損耗與 S11............ 8
3.2 天線的輻射場型與增益....... 9
3.3 共面波導.................. 11
3.4 整流天線.................. 12
3.5 半波整流與倍壓整流......... 13
3.6 微帶線阻抗匹配............. 14
第四章 雙頻整流天線之接收天線設計.. 16
4.1 接收天線設計.............. 16
4.2 接收天線結構模擬分析....... 17
4.3 量測結果.................. 24
第五章 雙頻整流天線之整流電路設計.. 28
5.1 雙頻整流電路設計........... 28
5.1.1 雙頻整流電路形式......... 28
5.1.2 雙頻整流電路結構模擬分析.. 30
5.2 量測雙頻整流電路結果....... 43
5.3 量測雙頻整流天線結果....... 46
第六章 結論..................... 48
參考文獻........................ 49
Extended Abstract.............. 52

[1] Y. H. Suh and K. Chang, “A novel dual frequency rectenna for high efficiency wireless power transmission at 2.45 and 5.8 GHz” IEEE Transactions on Microwave Theory and Techniques, vol.50, no.7, 2002.
[2] H. Sun, Y. X. Guo, M. He, and Z. Zhong, “A Dual-Band Rectenna Using Broadband Yagi Antenna Array for Ambient RF Power Harvesting” IEEE Antennas and Wireless Propagation Letters, vol.12, pp.918-921, 2013.
[3] D. K. Ho et al., “Dual-band rectenna for ambient RF energy harvesting at GSM 900 MHz and 1800 MHz” 2016 IEEE International Conference on Sustainable Energy Technologies (ICSET), 2016.
[4] M. Mattsson, C. I. Kolitsidas, and B. L. G. Jonsson, “Dual-Band Dual-Polarized Full-Wave Rectenna Based on Differential Field Sampling” IEEE Antennas and Wireless Propagation Letters, vol.17, no.6, pp.956-959, 2018.
[5] M. Wang et al., “Compact dual-band rectenna for RF energy harvest based on a tree-like antenna” IET Microwaves, Antennas & Propagation, vol.13, pp.1350-1357, 2019.
[6] K. Bhatt, S. Kumar, P. Kumar, and C. C. Tripathi, “Highly Efficient 2.4 and 5.8 GHz Dual-Band Rectenna for Energy Harvesting Applications” IEEE Antennas and Wireless Propagation Letters, vol.12, no.12, 2019.
[7] V. Marian, C. Vollaire, J. Verdier, and B. Allard, “Potentials of an Adaptive Rectenna Circuit” IEEE Antennas and Wireless Propagation Letters, vol.10, 2011.
[8] S. Ladan, N. Ghassemi, A. Ghiotto, and K. Wu, “Highly Efficient Compact Rectenna for Wireless Energy Harvesting Application” IEEE Microwave Magazine, vol.14, pp.117-122, 2013.
[9] C. P. Wen, “Highly Efficient Compact Rectenna for Wireless Energy Harvesting Application” 1969 G-MTT International Microwave Symposium, 1969.
[10] H. Ozdemir and T. Nesimoglu, “Microwave Energy Harvesting by Using a Broadband Fractal Antenna and a Dual-Band Rectifier” 2018 18th Mediterranean Microwave Symposium (MMS), 2018.
[11] S. Shen, Y. Zhang, C. Y. Chiu, and R. Murch, “An Ambient RF Energy Harvesting System Where the Number of Antenna Ports is Dependent on Frequency” IEEE Transactions on Microwave Theory and Techniques, vol.67, pp.3821-3832, 2019.
[12] H. He and T. Li, “Design of an indoor RF Energy Harvesting Module using Dual-Band Rectenna Array for IoT Applications” 2019 IEEE 4th Advanced Information Technology, Electronic and Automation Control Conference (IAEAC), 2019.
[13] K. Niotaki et al., “A Compact Dual-Band Rectenna Using Slot-Loaded Dual Band Folded Dipole Antenna” IEEE Antennas and Wireless Propagation Letters, vol.12, pp.1634-1637, 2013.
[14] H. Mahfoudi, H. Takhedmit, and M. Tellache, “Dual-band dual-polarized stacked rectenna for RF energy harvesting at 1.85 and 2.45 GHz” 12th European Conference on Antennas and Propagation (EuCAP 2018), 2018.
[15] N. Eltresy, D. Eisheakh, E. Abdallah, and H. Elhenawy, “RF Energy Harvesting Using Efficiency Dual Band Rectifier” 2018 Asia-Pacific Microwave Conference (APMC), vol.67, 2018.