Terahertz broadband even harmonic mixing circuit based on distributed radio frequency loop and mixer

Abstract

The invention provides a terahertz broadband even harmonic mixer circuit based on a distributed radio frequency loop and a mixer, and the mixer circuit comprises a radio frequency input probe, an anti-parallel diode pair, a cascaded wide stop band high suppression local oscillator filter, a local oscillator input probe, an intermediate frequency filter and an intermediate frequency output port, which are sequentially connected and integrated on a microstrip line. The radio frequency input probe is grounded, and the near radio frequency input end of the antiparallel diode pair is grounded to form a distributed multi-radio frequency loop. According to the circuit, the distributed multi-radio-frequency loop is utilized, the influence of the ground loop on the bandwidth, low frequency conversion loss and other performance of the terahertz even-order mixer is effectively reduced, the local oscillation harmonic clutter is matched through the distributed multi-radio-frequency loop, the influence of the terahertz harmonic clutter is reduced, the bandwidth of the mixer is expanded, and the frequency conversion loss of the mixer is reduced.

Description

technical field [0001] The present disclosure relates to the technical field of even-order harmonic mixers, and in particular to a terahertz broadband even-order harmonic mixing circuit and a mixer based on a distributed radio frequency loop. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The broadband mixing detector based on the planar Schottky diode is the core component of the terahertz test instrument. Its main function is to convert the high-frequency terahertz signal into a low-frequency microwave signal, and then realize the analysis of the terahertz signal through the analysis of the microwave signal. Processing; since there is no terahertz broadband commercial low-noise amplifier above 200 GHz, the mixer has become the first stage of the signal receiving front end in the terahertz test instrument. How to realize the low convers...

AI Technical Summary

Problems solved by technology

[0003] The broadband mixing detector based on the planar Schottky diode is the core component of the terahertz test instrument. Its main function is to convert the high-frequency terahertz signal into a low-frequency microwave signal, and then realize the analysis of the terahertz signal through the analysis of the microwave signal. Processing; since there is no terahertz broadband commercial low-noise amplifier above 200 GHz, the mixer has become the first stage of the signal receiving front end in the terahertz test instrument. How to realize the low conversion loss of the terahertz mixer in the broadband Performance indicators such as noise and temperature have become the key to improving the performance of terahertz test instruments. However, the inventors found that the technical route of existing terahertz even-order harmonic mixers mostly adopts a single-loop technical approach. The wavelength of the frequency band is long, and the influence of the circuit of the mixer on the performance of the mixer is relatively small, but as the frequency continues to increase, the influence of the circuit becomes larger and larger, making the broadband of the terahertz even harmonic mixer The contradiction between band characteristics and low frequency conversion loss characteristics is becoming more and more prominent

Images