420GHz 10th harmonic frequency mixer

Abstract

The invention provides a 420GHz 10th harmonic frequency mixer. The 420GHz 10th harmonic frequency mixer comprises a radio-frequency input waveguide, a radio-frequency waveguide-suspended micro-strip transition structure, a diode, a radio-frequency suppression low-pass filter, a local oscillator waveguide-suspended micro-strip transition structure, a local oscillator input waveguide and an intermediate-frequency filter, which are connected in sequence, wherein a radio-frequency signal is input by the radio-frequency input waveguide and is fed into the diode after coupled by the radio-frequency waveguide-suspended microstrip transition structure; the intermediate-frequency filter, the local oscillator waveguide-suspended micro-strip transition structure and the local oscillator input waveguide form a local oscillator-intermediate-frequency duplexer together; a local oscillator signal is input by the local oscillator input waveguide and is fed into the diode after passing through the duplexer and the radio-frequency suppression low-pass filter in sequence; frequency mixing is carried out on the radio-frequency signal and the local oscillator signal in the diode, and a frequency mixing signal is output; and the radio-frequency suppression low-pass filter is a 9-order CMRC (Compact Microstrip Resonant Cell) low-pass filter with a wide stop-band. According to the 420GHz 10th harmonic frequency mixer, by adopting a 10th harmonic frequency mixing way, the local oscillator frequency is greatly reduced; meanwhile, by adopting the 9-order CMRC low-pass filter, the circuit dimension is effectively reduced.

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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