Broadband amplitude modulation millimeter wave reflection system based on waveguide modulation technology

Abstract

The invention belongs to the technical field of nuclear fusion plasma microwave diagnosis and in particular relates to a broadband low-loss high-frequency microwave modulator based on a rectangular waveguide and a broadband amplitude modulation millimeter wave reflection system based on the waveguide modulator. A quartz crystal oscillator B is connected with a power amplifier; the power amplifier is connected with an intermediate frequency input end of the waveguide modulator; a microwave source is connected with a microwave input end of the waveguide modulator; the waveguide modulator is connected with a microwave amplifier; the microwave amplifier is connected with a horn antenna; a microwave detector is connected with a frequency-selecting amplifier; the frequency-selecting amplifier is connected with a down converter A; the quartz crystal oscillator B is also connected with a down converter B; a quartz crystal oscillator A is respectively connected with the down converter A and the down converter B; the down converter A is connected with a band-pass filter A; the band-pass filter A is connected with a phase discriminator; the down converter B is connected with a band-pass filter B; the band-pass filter B is connected with the phase discriminator. According to the system, low-loss ultrahigh-frequency microwave amplitude modulation can be realized.

Description

technical field [0001] The invention belongs to the technical field of nuclear fusion plasma microwave diagnosis, and in particular relates to a rectangular waveguide-based broadband, low-loss, high-frequency microwave modulator and a broadband amplitude modulation millimeter wave reflection system based on the waveguide modulator. Background technique [0002] Plasma electron density and temperature are the most critical physical parameters for plasma magnetic fluid instability, electron heat transport, particle transport, turbulence, high confinement mode operation, and plasma profile control and operation in controlled nuclear fusion experiments. one. Microwave diagnosis can go deep into the plasma to measure electron density and electron temperature distribution and disturbance with high spatio-temporal resolution. It is one of the advanced diagnostic technologies that are currently being developed preferentially in several major fusion devices in the world. In order to...

AI Technical Summary

Problems solved by technology

At present, the modulation frequency of most broadband millimeter-wave microwave frequency sources at home and abroad is about 1MHz in the FM and AM working modes, and some microwave sources that can reach 10MHz, as the frequency increases, the modulation degree becomes smaller and smaller, so these mmWave frequency sources cannot be used directly for AM or FM microwave reflection measurements on controlled fusion devices

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