Loss and Distortion Characteristics of Large Two-plate Guided-wave Antennas for Transmitting Nuclear Electromagnetic Pulse

doi:10.12382/bgxb.2022.1243

Abstract

Abstract:

Large guided-wave nuclear electromagnetic pulse simulators are used to produce a free-space illumination environment for testing system-level equipment. For the two-plate guided-wave antenna usually used in these simulators, there may exist the transmission loss or waveform distortion problems as if the design has not been optimized. Several main influencing factors are analyzed with electromagnetic simulation software and comparisons of series of examples. These factors include the permittivity loss of soil and its suppression, the discontinuity of structure from the front conic plate to the parallel plate, the field energy leakage through the wire gaps for the wire-array upper plate, and so on. It is shown that, for the usual case of equal widths of the upper and ground plates, the dissipation of soil beneath the ground plate shall result in the loss of voltage transmission efficiency greater than 25 percent. And the lower-plate width is properly enlarged to screen the loss of soil, which almost eliminates the transmission efficiency loss of voltage. Secondly, the discontinuity of structure at the turning point of the upper plate shall result in a duplex peak characteristic of E-field waveforms with lowered amplitudes and distorted profiles for most view points in the parallel section. For the wire-gap leakage effect, a maximal wire-gap of 0.3m may be sufficient to maintain the fast rise time of the exciting pulse. Finally, as an application example, a guided-wave antenna is designed to obtain a test volume greater than 20m×20m×10m,which has a 60-meter-long and 15-meter-high conical section consisting of 100 wires and a ground plate with an enlarging width of 3 meters. The antenna can transmit the double-exponential pulse with 2.5-3ns rise time fairly well to the main test volume.

Key words: nuclear electromagnetic pulse, two-plate guided-wave antenna, transmission loss, waveform distortion, metal wire array

CLC Number:

TN821⁺.1

WU Gang, XIAO Jing, XIE Linshen. Loss and Distortion Characteristics of Large Two-plate Guided-wave Antennas for Transmitting Nuclear Electromagnetic Pulse[J]. Acta Armamentarii, 2024, 45(4): 1311-1320.

Figures/Tables 12

References 24

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地极板条件	电流峰值/A	馈入阻抗/Ω
自由空间	440	114
湿土壤	487	103
干土壤	469	107
土壤全屏蔽	563	89
地极板拓宽δ=5m	569	88
地极板拓宽δ=3m	571	88
地极板拓宽δ=1.5m	569	88
地极板拓宽δ=0.5m	567	88

地极板条件	电流峰值/A	馈入阻抗/Ω
自由空间	440	114
湿土壤	487	103
干土壤	469	107
土壤全屏蔽	563	89
地极板拓宽δ=5m	569	88
地极板拓宽δ=3m	571	88
地极板拓宽δ=1.5m	569	88
地极板拓宽δ=0.5m	567	88

地极板条件	测点/m
地极板条件	(40,10,1)	(60,10,1)	(60,10,10)
自由空间	5.4	3.7	3.3
湿土	2.8	2.1	2.6
地极板拓宽δ=5.0m	3.8	3.0	3.5
地极板拓宽δ=3.0m	3.7	2.9	3.5
地极板拓宽δ=1.5m	3.5	2.8	3.3
地极板拓宽δ=0.5m	3.3	2.6	3.1

地极板条件	测点/m
地极板条件	(40,10,1)	(60,10,1)	(60,10,10)
自由空间	5.4	3.7	3.3
湿土	2.8	2.1	2.6
地极板拓宽δ=5.0m	3.8	3.0	3.5
地极板拓宽δ=3.0m	3.7	2.9	3.5
地极板拓宽δ=1.5m	3.5	2.8	3.3
地极板拓宽δ=0.5m	3.3	2.6	3.1

位置	测点/m	金属板	N
位置	测点/m	金属板	100	48	24
中轴面内近地测点	(40, 0, 1)	2.6	2.6	2.8	3.2
	(50, 0, 1)	2.6	2.7	2.8	3.0
	(60, 0, 1)	2.8	2.8	3.1	2.9
中轴面近上板测点	(50,0, 10)	2.5	2.6	3.6	4.9
中轴面近上板测点	(60,0, 10)	2.8	2.9	3.6	4.8
近极板边缘测点	(50,10,10)	2.4	3.5	5.3	7.4
近极板边缘测点	(60,10,10)	2.7	3.5	4.6	5.9