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Urunchi, China

She X.,PLA Unit 63655 | Liu X.,PLA Unit 63655 | Yan Y.,PLA Unit 63655 | Chen J.,PLA Unit 63655 | Jiang T.,PLA Unit 63655
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2011

The paper analyzes the response equation of TEM horn to Gaussian pulse based on the theory of transmission line. The dependence of TEM horn's response on its open angle is numerically studied under the excitation of Gaussian pulse and its differential, respectively, according to the tail fluctuation and negative peak undershoot in response. The experiments are conducted based on the time-domain test system with cone TEM cell. The results show that, for differential Gaussian pulse of 1 ns bottom-width, the negative peak undershoot increases from 1.0% to 3.6%, as the open angle varies from 8° to 20°. The experimental results are consistent with theoretical analysis and numerical simulation. Source


Yan F.,PLA Unit 63655 | Cui X.,PLA Unit 63655 | Li Z.,PLA Unit 63655 | Yang M.,PLA Unit 63655 | And 2 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2011

The gain of pyramidal horns with different configurations was simulated and the high power microwave (HPM) measurement antenna with low gain was selected accordingly. The numerical simulation and experiment were carried out on the pyramidal horn's pulse response and gain with and without flange and waveguide. The selected pyramidal horn will not distort the waveform of the short microwave pulse with 20 ns pulse width, and thus it can be used in the measurement of short microwave pulse. The influence of the flange and the 300 mm waveguide on the gain is less than 0.2 dB. Moreover, the pattern of the pyramidal horn is smooth and the beam width is about 50° for HPM measurement. The selected pyramidal horn is qualified for high power microwave radiation field measurement in complicated environment. Source


Yan J.,PLA Unit 63655 | Liu X.,PLA Unit 63655 | Ye H.,PLA Unit 63655 | Yang M.,PLA Unit 63655 | And 3 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2011

The paper studied the array method for the measurement of X-Band high power microwave (HPM) feed total radiation power. The radiation field of an X-band HPM feed was simulated to determine three key parameters of surface integral method, and the measurement error caused by the integral method was estimated. An array with 8 probes was designed to enhance the power density measurement precision and stability, with each probe carefully tested and calibrated. The measurement result shows that, the pulse waveforms obtained by different probes are almost the same; the power density measurement difference of 3 shots obtained by the same probe is within ±0.1 dB; the power density measurement difference of the 8 different probes is within ±0.3 dB. Cold and hot tested patterns of the feed agree with each other, and the derived integral total power is consistent with that obtained through equivalent isotropically radiated power measurement within 0.4 dB deviation. Source

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