A device and method for suppressing harmonics of electron tube amplifier

Abstract

The invention discloses a device and method for inhibiting tube amplifier harmonic waves. The device comprises a rectangular waveguide, a wedge-shaped waveguide and wave absorption materials. The rectangular waveguide and the wedge-shaped waveguide are filled with the wave absorption materials. The rectangular waveguide and the wedge-shaped waveguide are combined to form waveguide load mounted on the periphery of the high-power output end of a tube amplifier. The method includes: using a rectangular waveguide cutoff frequency formula to obtain the size of the rectangular waveguide according to a harmonic wave signal mode; acquiring the tail-end included angle of the wedge-shaped waveguide according to the dielectric constant and magnetic conductivity of the wave absorption materials to allow the harmonic waves to be absorbed completely; acquiring the number and mounting positions of needed waveguide load according to the waveguide type at the power output end of the tube amplifier. The device and method has the advantages that the waveguide load formed by the rectangular waveguide and the wedge-shaped waveguide is loaded at the high-power radio frequency wave output end, radio frequency waves do not enter the waveguide load, the harmonic waves enter the waveguide load and are absorbed completely, the harmonic wave problem of a radio frequency system is solved effectively, and the power of the radio frequency waves is not lowered.

Description

technical field [0001] The invention belongs to the field of radio frequency power amplification output, and specifically relates to a device and method for suppressing harmonics of an electronic tube amplifier. The device is installed at the power amplification output end of a radio frequency system to suppress harmonic signals and ensure the accuracy, stability and reliability of the electronic tube power amplifier. Background technique [0002] At present, radio frequency systems are widely used in military, industrial, and agricultural production, such as military radar, jammer, early warning aircraft, weather radar, food processing, steelmaking, laser welding and cutting, nuclear fusion and other fields. Among them, the radio frequency system is mainly used to provide high-power radio frequency wave energy, its power level ranges from several kilowatts to tens of megawatts, and the operating frequency range is generally several megahertz to several gigahertz. According ...

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Problems solved by technology

According to the devices used for RF wave power amplification, equipment that generates high-power RF wave energy is divided into: vacuum tube transmitters and solid-state transmitters. Harmonic signals, including harmonic components, spurious radiation, intermodulation products, transmitter intermodulation products, etc. These harmonics will lead to poor quality and stability of radio frequency signals, reduced signal-to-noise ratio, and deterioration of communication quality, which will affect Serious impact on the stable operation of the RF system

[0003] To weaken the influence of harmonic interference, it is generally chosen to add a filter at the output port of the transmitter to suppress harmonics, but the filter has a passband with little attenuation. When the harmonic signal is near the radio frequency wave, the filter suppresses the harmonic effect Not good, on the other hand, there is insertion loss in the filter, and the power of the signal will be reduced after the high-power RF wave passes through the filter

[0004] At present, the waveguide load is mainly used to absorb the remaining energy of the radio frequency wave and prevent leakage, but it does not appear in the application of suppressing the harmonics of the radio frequency system

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