本論文基於自我注入鎖定技術，發展一新型介電係數量測系統。其主要電路包含自我注入鎖定迴路與後端解調電路。首先，自我注入鎖定迴路的部分，本論文使用共面波導(CPWG)作為待測介質之感測器，將之置入自我注入鎖定迴路中，振盪器工作頻率會因受到相位變化量的影響而產生偏移，可利用此現象來進行相位偵測。接著，振盪器之輸出訊號進入解調電路，先進行直流準位校正，再做兩階段解調計算，即可得到因介質所造成的相位變化量。最後，用所得到的介質之相位差可以對應到介電係數。根據實驗結果，本系統所量測出之相位差與使用網路分析儀所量測的結果趨勢一致，但精準量測數，仍進一步改善。

This thesis develops a new system for dielectric constant measurement based on the self-injection-locked (SIL) technology. This system includes a SIL loop and its demodulation circuitry. For the part of the SIL loop, a section of the grounded coplanar waveguide (CPWG) is employed to be treated as the material under test (MUT) sensor, and then embedded it into the SIL loop. The oscillation frequency of the oscillator will be shifted by the phase variation, which is caused by putting different MUTs on the CPWG. Hence, the phase variation caused by the MUT can be further mapped to the oscillation frequency shift. As the output signals of the SIL loop are sent into the demodulation circuitry, the dc offset level should first be calibrated, and then the two-stage arc tangent demodulation procedures are performed to obtain the phase variation. Finally, the demodulated phase variation can be further mapped to the dielectric constant. According to the experimental results, the phase variation measured by the developed system and the those measured by the network analyzer have the similar trend. However, the measurement accuracy still needs to be improved in the future.

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