Abstract
Based on the path encoding pulse compression teleology, a novel method for obtaining high-power microwave (HPM) pulse with ultrahigh repetition frequency is proposed in this paper. The mechanism of the path encoding pulse compression teleology is first introduced. And then, the obtained HPM pulse is analyzed. Theoretical analysis shows that the peak power of MW level and the repetition frequency of MHz level for the generated HPM pulse can be easily reached. To demonstrate the effectiveness of this method for obtaining HPM pulse with ultrahigh repetition frequency characteristic, a HPM-obtaining experiment was carried out based on an S-band microwave source. The HPM pulses with the width of 1 ns, 2 ns, and 3 ns are studied, respectively. The measured results show that the HPM pulse with the power higher than 100 kW and the repetition frequency of 250 kHz at the frequency of 2.856 GHz is easily obtained. The repetition frequency of the generated HPM pulse can be easily changed. Because the pulse with the power higher than 100 kW and the repetition frequency of several hundreds of kHz is obtained for the first time, this type of pulse will have a broad prospect of application in the communication, radar, and electronic countermeasure fields. In addition, the effect experiment of interfering communication and control links was carried out by utilizing the ultrahigh repetition frequency characteristic of the generated HPM pulse. Also, the experiment results show the feasibility of this pulse for interfering the communication and control links.
Highlights
Ere are three methods for human to generate high-power microwave (HPM) signals. e first method is to use the microwave semiconductor solid-state devices for generating microwave signal [3]. e advantage of this method is used to generate continuous wave less than 1 kW. If this method is used to generate pulse wave, the peak power of the pulse will not be higher than that of continuous wave. e second method is to adopt the electronic vacuum devices [4,5,6]. e electronic vacuum devices can be divided into the magnetron tubes, klystron, traveling wave tube, and so on. e different electronic vacuum devices have their own characteristic to generate microwave signal. e maximum peak power generated by using electronic vacuum devices can reach to tens of MW level for the pulse wave and 10 kW level for the continuous wave
A higher peak power can be achieved. e current pulse compression technologies applied in the field of HPM are mainly the switched energy storage (SES) technology and the SLAC energy double (SLED) technology [13, 14]. e basic principle of the above pulse compression technology is that a long pulse is injected to a cavity and stored
Because the length T1 of encoding long pulse signal can be set to microsecond level, the repetition frequency of the microwave narrow pulse train can reach to hundreds of kHz, which is higher than that of HPM pulse generated by using the conventional vacuum relativistic technology
Summary
E rectangular waveguide is a typical dispersive system It is a good choice for modulating the velocity of propagation electromagnetic wave to realize pulse compression. Is is because the only way to realize pulse compression for a single path is modulating the group velocity of electromagnetic wave. For the sake of simplification, the assuming condition is given as follows: (1) the cavity is lossless; (2) the input and output ports are N-element antennas with omnidirectional radiation characteristic and equal amplitudes; (3) the times for the short pulses passing the transmission paths from the first to Nth satisfy the condition of T1, T1 + t1 . By using the simulation software of CST, the output long pulse waveform is obtained as shown in Figure 4(a) when a narrow pulse with the width of t1 is fed into a big cavity.
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