Method for pulse length reduction of powerful shf radiation and method for its implementation

FIELD: electricity.

SUBSTANCE: method for pulse length reduction of powerful SHF radiation and method for its implementation is characterised by introduction of SHF pulses into waveguide section with gas-filled tubes, under influence of downward powerful SHF radiation SHF-discharges are excited in the gas-filled tubes thus leading to formation of an electromagnetic band structure and pulse narrowing. The device for pulse length reduction of powerful SHF radiation contains a waveguide section with three gas-filled tubes connected by its one end through a coaxial transition and ferrite isolator to SHF-generator and by its other end through a coaxial transition and ferrite isolator to SHF-detector, the three gas-filled tubes are placed along the waveguide section perpendicular to its wide walls with distance l=Λ0/2÷Λ0, where Λ00(1-(λ0/2a)2)-1/2 is wave length in the waveguide, λ0 is wave length of downward SHF-radiation; a is a size of the wide wall in the waveguide section.

EFFECT: reducing length of microsecond pulse of powerful SHF radiation up to 10 ns and less.

2 cl, 2 dwg

 

The group of inventions relates to the field of microwave waveguide technology and can be applied in radar technology.

The known method and device for the formation of a powerful short microwave pulses [1], including the excitation of low-power microwave signal, amplification and modulation of the microwave signal, the selection signal with the frequency of the carrier oscillation, f0and the phase φ0producing band frequency and/or phase filtering the modulated microwave signal, then amplify the received signal and re-filtered, effecting selection of powerful signal with the frequency of the carrier oscillation, f0and the phase φ0.

Closest to the technical nature of the claimed invention are the method and apparatus of generating waves of the microwave range emitted in short pulses [2]. The method consists in the formation of short pulses of microwave radiation from a continuous path changing laser plasma formation in the waveguide section, filled with a certain gas at low pressure, which causes total reflection of the incident microwave radiation and, accordingly, the interruption of the passing wave microwave. The disadvantage of this device is that the filling section of the waveguide gas at low pressure reduces (waveguide) breakdown strength for plasma ignition uses a laser.

adaca of this invention is the reduction in the duration microsecond pulse of high-power microwave radiation up to 10 NS or less.

The way to shorten the duration of a pulse of high-power microwave radiation, whereby a pulse of microwave radiation is slid in the waveguide section with gas-filled tubes under the action of incident high-power microwave radiation in gas-filled tubes excite microwave discharges, which leads to the formation of electromagnetic band structure and to a narrowing of the pulse, and the power of the incident microwave radiation exceeds required for microwave breakdown in tubes.

The way to shorten the duration of a pulse of high-power microwave radiation is implemented using the device.

Device for reducing the pulse duration high-power microwave radiation, containing waveguide section with three gas-filled tubes, one side through a coaxial-waveguide transition and ferrite gate connected to the output of the microwave generator, and the other side through the coaxial-waveguide transition and ferrite valve to a microwave detector, three gas-filled tubes are located along the waveguide section perpendicular to its wide walls with period l=Λ0/2÷Λ0where Λ00(1-(λ0/2and)2)-1/2the wavelength in the waveguide, λ0- the wavelength of the incident microwave radiation;and- size of the broad wall of the waveguide section.

The essence of the device is illustrated by figure 1, where:

1 waveguide section;

2 - coaxial-ox is ovocny transition;

3 - ferrite valve;

4 - microwave generator;

5 - microwave detector;

6 - gas-filled tube.

According to the invention the output of the microwave generator 4 through the valve 3 and the coaxial-waveguide transition 2 is connected to the waveguide section 1. The microwave signal from the waveguide sections 1 through another coaxial-waveguide transition 2 and the valve 3 is fed to the microwave detector 5. Gas-filled tube 6 is installed along the waveguide section on its axis perpendicular to the broad walls with period l=Λ0/2÷Λ0where Λ00(1-(λ0/2a)2)-1/2the wavelength in the waveguide, λ0- the wavelength of the incident microwave radiation;and- size of the broad wall of the waveguide section.

The device operates as follows.

Microwave radiation from the microwave generator 4 is fed into the waveguide section 1, it is logged and microwave detector 5. Under the action of incident high-power microwave radiation in gas-filled tubes 6 arise plasma columns, occupying the space between the broad walls of the waveguide section, which leads to a sharp reduction in the duration of the last pulse.

In the practical implementation of the model was used rectangular waveguide section 23×10 mm2,with a length of about 50 cm and the incident microwave radiation with a wavelength in air λ0=33 mm Three gas-filled tube (length not less than 15mm, the internal diameter of 3 mm, filled with neon at a pressure of 70 mm Hg) was perpendicular to the broad walls of the waveguide section in the holes of 4 mm diameter is drilled at a distance of l=38 mm from each other in the middle of a large wall that corresponds to the range l=Λ0/2÷Λ0=24÷48 mm When turning on the microwave generator 4 under the action of incident microwave radiation power of 20 kW and a pulse duration of 200 NS (figure 2, curve 1) in gas-filled tubes 6 arise plasma columns, and the duration of the last pulse of microwave sharply reduced to 10 NS (figure 2, curve 2).

The use of the invention allows to reduce the duration microsecond pulse of high-power microwave radiation.

Sources of information

1. EN 2210857.

2. EN 2188500.

3. Control of electromagnetic band gap devices by discharge plasmas / V.I. Arkhipenko [et al.] // Proceedings of the VIII International Workshop on Microwave Discharges: Fundamentals and Applications (MD-8), Zvenigorod, Russia, 10-14 September 2012 / Sci. Council of RAS on Physics of Low Temperature Plasma; ed. Yu.A. Lebedev. - Moscow: Yanus-K, 2012. - P.275-280.

1. The way to shorten the duration of a pulse of high-power microwave radiation, whereby a pulse of microwave radiation is slid in the waveguide section with gas-filled tubes, characterized in that under the action of incident high-power microwave radiation in gas-filled tubes excite microwave discharges, which leads to the formation of electromagnetic band structure and to a narrowing of the pulse, when atmosnet incident microwave radiation exceeds required for microwave breakdown in tubes.

2. Device for reducing the pulse duration high-power microwave radiation method according to claim 1, containing waveguide section with three gas-filled tubes, one side through a coaxial-waveguide transition and ferrite gate connected to the output of the microwave generator, and the other side through the coaxial-waveguide transition and ferrite valve to a microwave detector, characterized in that the three gas-filled tubes are located along the waveguide section perpendicular to its wide walls with period l=Λ0/2÷Λ0where Λ00(1-(λ0/2a)2)1/2the wavelength in the waveguide, λ0- the wavelength of the incident microwave radiation;and- size of the broad wall of the waveguide section.



 

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FIELD: electricity.

SUBSTANCE: method for pulse length reduction of powerful SHF radiation and method for its implementation is characterised by introduction of SHF pulses into waveguide section with gas-filled tubes, under influence of downward powerful SHF radiation SHF-discharges are excited in the gas-filled tubes thus leading to formation of an electromagnetic band structure and pulse narrowing. The device for pulse length reduction of powerful SHF radiation contains a waveguide section with three gas-filled tubes connected by its one end through a coaxial transition and ferrite isolator to SHF-generator and by its other end through a coaxial transition and ferrite isolator to SHF-detector, the three gas-filled tubes are placed along the waveguide section perpendicular to its wide walls with distance l=Λ0/2÷Λ0, where Λ00(1-(λ0/2a)2)-1/2 is wave length in the waveguide, λ0 is wave length of downward SHF-radiation; a is a size of the wide wall in the waveguide section.

EFFECT: reducing length of microsecond pulse of powerful SHF radiation up to 10 ns and less.

2 cl, 2 dwg

FIELD: radio engineering, communication.

SUBSTANCE: microwave emission pulse is introduced to a waveguide section with gas-discharge lamps; glow discharges are lit in gas-discharge lamps by means of a pulse voltage generator, which leads to formation of a electromagnetic band structure. A device for reduction of duration of a microwave emission signal includes a waveguide section with five gas-discharge lamps, which is connected with one of its sides through a coaxial-waveguide transition and a ferrite valve to microwave generator output, and with the other side through a coaxial-waveguide transition and ferrite valve to a microwave detector; five gas-discharge lamps are located along the waveguide section perpendicular to its wide walls at interval l=Λ0/2÷Λ0, where Λ00(1-(λ0/2a)2)-1/2 - waveguide wave length, λ0 - length of incident microwave emission wave; a - size of wide wall of the waveguide section, and they are connected to the pulse voltage generator that is connected to the pulse generator output, the output of the synchronisation pulse of which is connected to the microwave generator.

EFFECT: reduction of duration of microwave pulses from tens of microseconds to tens of nanoseconds.

2 cl, 2 dwg

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