- 學位論文
應用於微創脊椎手術定位之脊椎定位標籤電路設計
Design of Load-Modulated Tag for Spine Minimally Invasive Surgery
摘要
本論文設計應用於微創脊椎手術24GHz定位系統之定位標。微創脊椎手術中，因可施打骨釘的範圍狹窄，且有傷及中樞神經與椎間盤受損之風險，需要毫米波之定位準確度。為了符合此要求本論文運用負載調變技術，設計適合FMCW雷達定位系統之微波定位標。其安置在手術者的脊突上，此時當雷達系統發射FMCW訊號，經過定位標反射後，FMCW訊號將帶有另一調變頻率。其中一個優點可以明確區隔無調變之環境雜波與有調變之目標物回波訊號，第二優點是FMCW回波訊號拍頻至較高的定位標調變頻率，可避開原FMCW載波的相位雜訊，大幅改善訊雜比。第三優點是利用不同的調變頻率將可作為定位標的身分辨識。 定位標包含兩支微型天線，兩個單刀雙擲開關或單刀單擲開關和高或低調變訊號振盪器。本論文將敘述定位標的動作原理、電路設計、電路擺設、量測結果，以及與FMCW系統整合之量測結果。最遠至200 cm，可同時完全辨識出6組定位標籤電路。 關鍵字：領結型天線、二位元相位調變
並列摘要
In this thesis, a compact load-modulated tag was designed for microwave positioning system of spine minimally invasive surgery. In a spine minimally invasive surgery, due to the narrow area for operation to avoid nervous system and intervertebral disc injury, a positioning system with millimeter accuracy is necessitated. The load-modulation tag contains of two miniaturized bow-tie antennas, two SPDT switches and two oscillators. The advantages of the modulated-tag design include 1) the signal distinguish from environmental clutters, 2) higher FMCW beating frequency to avoid DC closed-in phase noise, and 3) identification of the tag, attributed from the modulation frequency. The operation principle, circuit design, package effect and layout for compactness will be discussed. The measurement results shows that six different tags can be clearly identified in two meters. Keyword:Bow-tie antenna, BPSK