A 420ghz Tenth Harmonic Mixer

Abstract

The present invention provides a 420GHz 10th harmonic mixer, comprising sequentially connected radio frequency input waveguide, radio frequency waveguide-suspension microstrip transition structure, diode, radio frequency suppression low-pass filter, local oscillator waveguide-suspension microstrip transition Structure, local oscillator input waveguide, intermediate frequency filter, the radio frequency signal is input by the radio frequency input waveguide, and is fed into the diode through the coupling of the radio frequency waveguide-suspension microstrip transition structure; the intermediate frequency filter, the local oscillator waveguide-microstrip transition structure, the The oscillator input waveguide together constitutes a local oscillator-IF duplexer. The local oscillator signal is input by the local oscillator input waveguide, and then fed into the diode after passing through the duplexer and the radio frequency suppression low-pass filter in turn. The diode is internal to the radio frequency signal and the local oscillator signal. Perform frequency mixing and output a mixed frequency signal; the radio frequency suppression low-pass filter is a 9th-order CMRC low-pass filter with a wide stop band. The present invention adopts the tenth harmonic frequency mixing form, which greatly reduces the local oscillator frequency, and simultaneously adopts a 9th-order CMRC low-pass filter to effectively reduce the circuit size.

Description

technical field [0001] The invention relates to a mixer, in particular to a 420GHz tenth harmonic mixer. Background technique [0002] Terahertz science and technology is a research direction that has developed rapidly in the past two decades. Terahertz waves refer to electromagnetic waves with a frequency between 0.1 and 10 THz, which are located between microwaves and infrared rays on the electromagnetic spectrum. Its long-wave band and millimeter waves ( Submillimeter wave) overlaps, and its development mainly depends on electronics science and technology; and its short-wave band overlaps with infrared, and its development mainly relies on photonics science and technology. It can be seen that terahertz wave is the frequency band for the transition from macroelectronics to microphotonics , occupies a very special position in the electromagnetic spectrum. [0003] THz science and technology integrates the characteristics of electronics and photonics, involving physics, che...

AI Technical Summary

Problems solved by technology

The filter in the circuit is often in the form of the simplest step impedance filter. The filter length of this structure is longer, which makes the overall circuit longer; at the same time, the stop band of the step impedance filter is narrow, so if the harmonic order High, it will inevitably cause the leakage of clutter signal, and the output energy of intermediate frequency signal will be reduced in disguise.

The actual use of these mixers requires a local oscillator signal source with excellent performance working in the terahertz frequency band, but most of the more mature signal sources are below the W band, which is difficult to meet the requirements of the terahertz mixer for the local oscillator. Therefore, it is generally necessary to design the corresponding local oscillator signal generator

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