本論文提出嶄新的寬度與波形調變之無線傳能(Wireless Power Transmission, WPT)技術，在無線生醫應用的低輸入功率限制下，以不同工作週期(Duty Cycle)與波形(Pulse Shape)的脈衝波(Pulse Wave)取代傳統連續波(Continuous Wave)進行能量傳輸，可有效提升RF-DC整流電路的輸出電壓(Vout)與能量轉換效率(Power Conversion Efficiency, PCE)。
理論分析採用數值軟體(Matlab)建立二極體與RF-DC倍壓整流電路能量轉換數值模型，預測RF-DC倍壓整流電路的最佳負載、輸出電壓與能量轉換效率，誤差小於10 %，並透過微波電路模擬軟體(Advanced Design System, ADS)模擬寬度調變技術提升RF-DC倍壓整流電路效率的成效。進一步提出波形調變技術，將不同種類的特殊波形有系統地以單一之波形參數建立模型，深入探討不同工作週期與波形對RF-DC倍壓整流電路的影響。由有線量測實驗與發光二極體驅動實驗結果可知，吾人可根據負載之導通電流，先決定最佳工作週期，再選擇最佳波形，可達到節省功率、提升能量轉換效率的最佳效果。
在生醫應用方面，本論文建立一簡化可解析的傳輸通道模型，考慮生醫無線傳輸通道的主要損耗，初步預測於生物組織內接收端天線所接收到的微波能量；並分別建置無線傳能系統與生醫無線傳能系統，進行無線生醫環境實測。在無線環境經不同生物組織厚度量測RF-DC倍壓整流電路在不同工作週期或特殊波形下的輸出電壓與能量轉換效率，無線生醫量測結果與有線量測、無線量測結果相當吻合。而在低平均輸入功率下，能量轉換效率可提升3.5倍，驗證以寬度與波形調變之無線傳能技術提升在生醫應用之低輸入功率限制下的效能優化。

This thesis presents a novel wireless power transmission (WPT) technique by using pulse width and pulse shape modulations under constraint of low input power for biomedical applications. Instead of using continuous wave for WPT, we could enhance the output voltage (Vout) and power conversion efficiency (PCE) of RF-DC rectifier by adjusting duty cycles and pulse shapes.
According to theoretical models of the diode and RF-DC voltage doubler rectifier, we could predict the optimal load, Vout, and PCE by using numerical analysis software (Matlab) within the error of less than 10 %. The PCE improvement of the RF-DC voltage doubler rectifier using the technique of pulse width can be simulated by Advanced Design System (ADS). Furthermore, the technique of pulse shape modulation is proposed. Several different types of waveforms can be systematically modeled with a single shape parameter. The effects of different duty cycles and pulse shapes on the PCE of the RF-DC voltage doubler rectifier are thoroughly investigated. From the experiment results of the wired transmission and the LED loads, we could determine the optimal duty cycle and waveform to achieve the best performance according to the current through the load. Therefore, we would reduce the input power and improve the PCE.
As for the study of biomedical applications, this thesis creates a simple analytical biomedical channel model under the consideration of the main attenuation factors to predict the receiving microwave power from receiving antenna buried inside the biological tissues. The WPT system and biomedical WPT system were established to perform wireless biomedical experiments. The the Vout and PCE using different duty cycles, and waveforms are wirelessly measured through in different thicknesses of biomedical tissus. The wireless biomedical experiment results are closely matched to both the wired and wireless experiment results. The PCE of RF-DC voltage doubler rectifier can be improved 3.5 times under constraint of low input power. The performance of using pulse width and pulse shape modulation WPT is verified to optimize the PCE under constraint of low input power in biomedical applications.

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