Method for pulse length reduction of powerful shf radiation and method for its implementation. RU patent 2520374.

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 Λ₀=λ₀(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 invention relates to the field of microwave guided wave technology and can be used in radar technology.

The known method and the device for the formation of powerful short microwave pulses [1]including excitation of low-power UHF signal, strengthening and modulation of the microwave signal, selection of the signal with the frequency of the carrier wave f 0 and phase Phi 0 , producing band frequency and/or phase filtration modulated microwave signals, then the received signal strengthen and re-filtered, effecting selection powerful signal with the frequency of the carrier wave f 0 and phase Phi 0 .

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

The objective of the invention is to reduce the duration microsecond pulse high-power microwave radiation to 10 NS or less.

Way to shorten the duration of a pulse of high-power microwave radiation in which a pulse of microwave radiation is slid in the waveguide section with gas-filled tubes, under the action of falling high-power microwave radiation in the 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 necessary for microwave breakdown in the tubes.

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

The device for the reduction of pulse high-power microwave radiation, containing waveguide section with three gas-filled tubes, one of his side through the coaxial waveguide transition and ferrite valve connected to the output of the microwave generator, and the other party through coaxial waveguide transition and ferrite valve - for a microwave detector, three gas-filled tubes are located along the waveguide sections perpendicular to its wide walls with period l=Λ 0 /2 EV Λ 0 , where : l 0 =λ 0 (1-(? 0 /2 (a ) 2 ) -1/2 - length of a wave in a waveguide, light wavelength 0 is the wavelength of the incident microwave radiation; and - the size of the wide side of the waveguide sections.

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

1 - waveguide section;

2 - coaxial waveguide 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 gate 3 and coaxial waveguide transition 2 is connected to the surge of session 1. Microwave signal from the waveguide sections 1 through another coaxial waveguide transition 2 and valve 3 is served on the microwave detector 5. Gas-filled tube 6 installed along the waveguide sections on its axis perpendicular to the wide walls with period l=Λ 0 /2 EV Λ 0 , where : l 0 =λ 0 (1-(? 0 /2 (a) (2 ) -1/2 - length of a wave in a waveguide, light wavelength 0 is the wavelength of the incident microwave radiation; and - the size of the wide side of the waveguide sections.

The device works as follows.

Microwave radiation from the microwave generator 4 is served in a waveguide section 1, it is logged and microwave detector 5. Under the action of falling high-power microwave radiation in the gas-filled tubes 6 arise plasma posts that occupies the space between the wide walls of the waveguide sections, which leads to a sharp reduction in the duration of the last impulse.

In the practical implementation of the model was used rectangular waveguide cross-section 23 x 10 mm2, length of approximately 50 cm and falling microwave radiation with a wavelength in air λ 0 =33 mm Three gas-filled tube (length not less than 15 mm, the internal diameter of 3 mm, filled with neon at a pressure of 70 mm Hg) is perpendicular to the wide walls of the waveguide sections in the holes with a diameter of 4 mm drilled at a distance of l=38 mm from each other in the middle of the wide walls, which corresponds to the range l=Λ 0 /2 EV Λ 0 =24 to 48 mm When switching on the microwave generator 4 under the influence of falling of microwave radiation power 20 kW and pulse width 200 NS (figure 2, curve 1) in gas-filled tubes 6 arise plasma pillars and the duration of the last impulse microwave sharply reduced to 10 NS (figure 2, curve 2).

Use the invention allows to reduce the duration of microsecond pulse 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. Way to shorten the duration of a pulse of high-power microwave radiation in which a pulse of microwave radiation is slid in the waveguide section with gas-filled tubes, wherein under the action of falling high-power microwave radiation in the 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 necessary for microwave breakdown in the tubes.

2. The device for the reduction of pulse high-power microwave radiation by method according to claim 1, containing waveguide section with three gas-filled tubes, one of his side through the coaxial waveguide transition and ferrite valve connected to the output of the microwave generator, and the other party through coaxial waveguide transition and ferrite valve - for a microwave detector, wherein three gas-filled tubes are located along the waveguide sections perpendicular to its wide walls with period l=Λ 0 /2 EV Λ 0 , where : l 0 =λ 0 (1-(? 0 /2 (a) (2 ) 1/2 - length of a wave in a waveguide, light wavelength 0 is the wavelength of the incident microwave radiation; and - the size of the wide side of the waveguide sections.