LCR with "traveling wave" pulse generator.

 

The goal of this experimental investigation is the design development of an LCR which allows one to radiate powerful electromagnetic pulses with nanosecond duration, repetition rate more than 50 kHz, small jitter, using a power supply voltage of less than 150 V. This is done without any after pulse oscillations and with minimal levels of backspace radiation.

 

 In order to increase the amplitude of current pulses in the radiator, the 7-stage circuit of pulses generator is used. The generator consists of seven avalanche switches in series forming a "traveling wave" generator. The pulses forming go on from central (third) switch. Timing of this switch realize with external timing generator. The usual circuit of avalanche switch timing is used. After switching on of third stage of the pulse generator two waves of currents with opposite polarity come from this switch to both sides. Each wave stimulates the switches on the next stages (and so on). The energy is stored in capacitors of avalanche switches add to the wave energy when the next stage switches on. Thus, we can obtain the increase (amplification) the amplitude of current pulse when it travels to the radiator. At the same time this "traveling wave former" is the return loop in the design of LCR.

Reflector is used to decrease backspace radiation.

 

 

PERFORMANCE ATTRIBUTES.

Radiated pulse is the one period of sin oscillation with following amplitude and time-domain parameters:

o       the rise time of pulse amplitude from 0 to abs(E_max) is 0.5 ns;

o       the duration of the negative half-period at the  0.5 E_max  level is 1.2 ns;

o       common pulse duration (both of half-periods) is 2.5 ns;

o       the amplitude of pulse of magnetic field strength at the 2 m distance from the radiator is about 0.2 A/m;

o       the width of the pick amplitude  pattern of the LCR at the 0.5E_max level in

§         E plane ............. 60^o,

§         H plane .............140^o,

o       the repetition rate of radiating pulses is in range up to 1 MHz;

o       the jitter is less than 0.1 ns.

 

It is necessary to use the power supply with voltage 160V and current - 5 mA.

The unit measures 0.4 x 0.3 x 0.2 m.

The weight - 1.2 kg.