[1] Wang Debo, Liao Xiaoping, Tian Tao,. Amplitude modulation measurementof symmetrical microwave power sensor [J]. Journal of Southeast University (English Edition), 2010, 26 (1): 68-72. [doi:10.3969/j.issn.1003-7985.2010.01014]
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Amplitude modulation measurementof symmetrical microwave power sensor(
)
对称式微波功率传感器的幅度调制测量
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 26
- Issue:
- 2010 1
- Page:
- 68-72
- Research Field:
- Circuit and System
- Publishing date:
- 2010-03-30
Info
- Title:
- Amplitude modulation measurementof symmetrical microwave power sensor
- 对称式微波功率传感器的幅度调制测量
- Author(s):
- Wang Debo; Liao Xiaoping; Tian Tao
- Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing 210096, China
- PACS:
- TN402
- DOI:
- 10.3969/j.issn.1003-7985.2010.01014
- Abstract:
- In order to reduce the mismatch error, a direct current(DC)calibration method is introduced when the modulated microwave signal is measured. The microwave power is input to the left section of the power sensor, and the DC power is input to the right of the power sensor. Due to the existence of parasitic loss and electromagnetic coupling, the microwave power results in a mismatch error. However, the DC power does not have the mismatch error. So the DC power applied in the right section can calibrate the mismatch error of the microwave power in the left section. The calibration factor is measured at different modulation rates and modulation depths.The measurement results show that the carrier frequency is the major factor influencing the measurement results. After calibration, the carrier frequency and the modulation rate have little effect on the output voltage. The frequency response becomes relatively flat in the frequency range up to 20 GHz, and the sensitivity on average is enhanced by about 0.12 mV/dBm. Therefore, the DC calibration method has a certain reference value for the terminal-type microwave power sensor.
- 为了减小失配造成的测试误差, 在测量调制信号的微波功率时提出了一种直流校正方法. 在传感器左端输入微波功率, 右端输入直流功率, 微波功率存在的寄生损耗和电磁耦合造成了失配误差, 而直流功率不存在失配误差, 所以通过右端输入的直流功率可以校正左端微波功率的失配误差. 测试了在不同调制率和调制深度的校正因子.测试结果表明, 载波频率是造成幅度调制测试误差的主要因素, 校正后载波频率和调制率对输出电压的影响很小, 频率响应在20 GHz范围内变得相对平滑, 而且灵敏度平均提高了大约0.12 mV/dBm. 因此, 该直流校正方法对于终端式微波功率传感器具有一定的参考意义.
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Memo
- Memo:
-
Biographies: Wang Debo(1983—), male, graduate; Liao Xiaoping(corresponding author), male, doctor, professor, xpliao@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.60976094), the National High Technology Research and Development Program of China(863 Program)(No.2007AA04Z328).
Citation: Wang Debo, Liao Xiaoping, Tian Tao. Amplitude modulation measurement of symmetrical microwave power sensor[J]. Journal of Southeast University(English Edition), 2010, 26(1): 68-72.