本論文主要係研製一型應用於人體吸呼及心跳量測之非接觸式生理訊號感測雷達模組，其中包含雷達收發模組、射頻被動電路、基頻電路及不同極化之天線陣列。為克服雷達感測系統量測零點問題，本論文係採用直接正交轉換電路架構實現雷達感測模組。此雷達感測系統之操作頻率為5.8 GHz，由市售積體電路及射頻被動電路實現，且以接地式共平面波導連結所有射頻元件。雷達感測模組所量測之每分鐘心跳次數與市售醫療級血氧濃度計比較，其誤差為每分鐘3次內，亦即誤差百分比為4.6 %內。此外，使用圓極化天線陣列作為雷達感測系統之收發天線，較使用線性極化天線陣列，可獲得較佳之系統可量測距離。本論文所研製之雷達模組使用圓極化天線陣列時，呼吸訊號之可量測距離為180 cm，心跳之可量測距離為60 cm。最後，本論文將雷達感測模組之收發天線變更為以複合式左/右傳輸線所設計之洩漏波天線以達到空間掃描功能。隨系統訊號源頻率由5.1 GHz改變至6.5 GHz時，天線擁有59°之空間掃描能力。當兩位受測者同時靜坐於雷達感測模組前方0°及26°方向時，可分別感測出受測者的呼吸及心跳頻率。

This thesis presents a non-contact vital-sign sensor radar for human’s respiration and heartbeat detection. The developed sensing radar system includes a radar transceiver module, radio-frequency (RF) passives, base band circuits, and linearly and circularly polarized antenna arrays. In order to overcome the null point effect, the quadrature direct conversion configuration is adopted to implement this radar module. The radar module is designed at 5.8 GHz, and implemented by commercial integrated circuits and grounded coplanar waveguide (GCPW) passive components. As compared with a medical finger pulse oximeter, the measured error of the heartbeat rate of the developed sensor radar is controlled under 3 time per minute, namely a relative error of 4.6 %. Moreover, using circularly polarized antenna arrays as transmitting and receiving antennas has a better measurement range capability than that of using the linearly polarized antennas The developed radar module adopts the circularly polarized antenna arrays, the measurement range capability of the heartbeat and respiration are 60 cm and 180 cm, respectively. Finally, the composite right/left-handed transmission line is adopted to developed a leaky-wave antenna to achieve the capability of space scanning, and employed in the developed radar module. When the frequency of the radar source varys from 5.1 to 6.5 GHz, the system can provide a 59° spatial scanning. When two human targets sit in front of the radar module at the azimuth angles of 0 ° and 26 °, the system can easily detect both respiration and heartbeat.

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