Terahertz frequency doubling source and working method thereof

Abstract

The invention discloses a terahertz frequency doubling source and a working method thereof. The terahertz frequency doubling source comprises a frequency doubling link. The frequency doubling link comprises a first-stage frequency doubling unit, a second-stage frequency doubling unit, a third-stage frequency doubling unit and a fourth-stage frequency doubling unit which are connected in sequence. The first-stage frequency multiplication unit is used for acquiring a microwave signal from a microwave signal input interface; the fourth-stage frequency multiplication unit is used for outputting the processed signal through an output port. By adopting a method of combining waveguide power division and double-layer frequency doubling synthesis, the compression point of the frequency multiplier is improved, the output power of the driving-stage amplifier is improved through synthesis of the power amplifier, and the problem of high-power output of a driving-stage frequency doubling link under the condition of no power amplifier is solved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a terahertz frequency multiplication source and a working method thereof. Background technique [0002] The statements in this section merely mention the background technology related to the present invention and do not necessarily constitute the prior art. [0003] The high-efficiency signal generation in the 0.75THz-1.1THz frequency band is of great significance to the technical research and application development in the fields of communication, radar, meteorological remote sensing, and deep space exploration in this frequency band. The 0.75THz-1.1THz frequency band signal generation based on the solid-state frequency doubling technology route has the characteristics of small size and adjustable frequency, and has received extensive attention and research from many scholars. The problems that need to be solved urgently in this technical route mainly include the foll...

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Problems solved by technology

[0005] The second is the technical problem of the mutual restriction of the wide frequency band and high efficiency of the final frequency multiplier

By increasing the harmonic order of the frequency multiplier from 0.75THz to 1.1THz, the frequency of the front-stage drive link can be reduced, thereby reducing the difficulty of generating high power in the front-stage drive link. However, due to the harmonic order of the final frequency multiplier The increase will lead to a decrease in the efficiency of frequency multiplication, which cannot meet the requirements for the generation of broadband high-power signals in the 0.75THz to 1.1THz frequency band. The frequency multiplication method of variable capacitor devices can improve the frequency conversion efficiency of the entire link, but it is difficult to achieve broadband

[0007] There are currently two main technical paths for frequency doubling sources that can expand the frequency to above 0.75THz. One is the narrowband high-efficiency frequency doubling link realized by varactor devices. This technical route utilizes the high frequency conversion efficiency characteristics of varactor devices, and By adjusting the operating point of the varactor device by adding a bias voltage, the generation of high-power signals in the drive stage can be realized, and the high frequency multiplication efficiency of the final-stage frequency multiplier can be realized, thereby generating higher-power terahertz signals, but the bandwidth is relatively small. Narrow, unable to meet the test requirements of broadband

Another technical route is high-order harmonic frequency multiplication. By increasing the harmonic order of the final frequency multiplier and reducing the frequency of the drive-level link, a wide frequency band can be achieved as a whole, but the output power is relatively small

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