有源器件的端口反射系数是器件的主要参数,端口反射系数的大小直接影响信号的输出功率。为实现有源器件在"射频开"状态下端口反射系数的测量,开展了阻抗调谐器法和网络分析仪频率偏移法的源端口反射系数测量方法研究,并针对...有源器件的端口反射系数是器件的主要参数,端口反射系数的大小直接影响信号的输出功率。为实现有源器件在"射频开"状态下端口反射系数的测量,开展了阻抗调谐器法和网络分析仪频率偏移法的源端口反射系数测量方法研究,并针对信号源和放大器开展了相应的实验。测量结果表明,10 d Bm输出时2种方法测得反射系数模值的差别小于0.06,相位变化差别优于10°,为有源器件端口反射系数的测量提供了可行的方法。展开更多
Based on existing low-frequency water-filled impedance tube testing facilities, which is a part of the Low Frequency Facility of the Naval Undersea Warfare Center in Beijing, an improved water-filled pulse tube method...Based on existing low-frequency water-filled impedance tube testing facilities, which is a part of the Low Frequency Facility of the Naval Undersea Warfare Center in Beijing, an improved water-filled pulse tube method is presented in this short paper. This proposed study is significantly different from the conventional pulse tube method because of the capability for a single plane damped sine pulse wave to generate in the water-filled pulse tube with a regular waveform and short duration time of about 1ms. During the generation process of the pulse, an inverse filter principle was adopted to compensate the transducer response. The effect of the characteristics of tube termination can be eliminated through the generation process of the pulse. Reflection coefficient from a water/air interface was measured to verify the proposed method. When compared with the expected theoretical values, a relatively good agreement can be obtained in the low frequency range of 500-2 000 Hz.展开更多
文摘有源器件的端口反射系数是器件的主要参数,端口反射系数的大小直接影响信号的输出功率。为实现有源器件在"射频开"状态下端口反射系数的测量,开展了阻抗调谐器法和网络分析仪频率偏移法的源端口反射系数测量方法研究,并针对信号源和放大器开展了相应的实验。测量结果表明,10 d Bm输出时2种方法测得反射系数模值的差别小于0.06,相位变化差别优于10°,为有源器件端口反射系数的测量提供了可行的方法。
基金Supported by the National Natural Science Foundation of China under Grant No. 11204242 China Postdoctoral Foundation under Grant No. 2011M501477
文摘Based on existing low-frequency water-filled impedance tube testing facilities, which is a part of the Low Frequency Facility of the Naval Undersea Warfare Center in Beijing, an improved water-filled pulse tube method is presented in this short paper. This proposed study is significantly different from the conventional pulse tube method because of the capability for a single plane damped sine pulse wave to generate in the water-filled pulse tube with a regular waveform and short duration time of about 1ms. During the generation process of the pulse, an inverse filter principle was adopted to compensate the transducer response. The effect of the characteristics of tube termination can be eliminated through the generation process of the pulse. Reflection coefficient from a water/air interface was measured to verify the proposed method. When compared with the expected theoretical values, a relatively good agreement can be obtained in the low frequency range of 500-2 000 Hz.
