Ultra-wideband frequency mixer

Abstract

The invention provides an ultra-wideband frequency mixer. The ultra-wideband frequency mixer comprises transition sections from a broadside coupling balun and a broadside coupling strip line of a local oscillator channel to a plane transmitting line, a coplanar waveguide of a radiofrequency channel, a medium frequency output channel and a frequency mixing diode pair, wherein the frequency of a local oscillator signal and the frequency of a radio frequency signal are mixed by input frequency mixing diodes of the local isolator channel and input frequency mixing diodes of the radiofrequency channel respectively; generated medium signals are outputted via the medium frequency output channel; the broadside coupling balun is used for converting unbalanced ultra-wideband local isolator signals into balanced ultra-wideband local isolator signals; after the balanced local isolator signals are converted into input frequency mixing diodes of the plane transmitting line via the transition section, generated medium signals step across the coplanar waveguide by using a gold wire inductor and then are outputted via a microstrip line. By using the scheme, the working frequency can cover an ultra-wide frequency range of 0.01GHz-110GHz; the ultra-wideband frequency mixer can work in a fundamental wave frequency mixing mode in a frequency range of 0.01GHz-70GHz, and the frequency conversion loss and a noise coefficient index can be lower than 12dB; and the ultra-wideband frequency mixer can work in a frequency range of 70GHz-110GHZ in a triple frequency harmonic frequency mixing mode, and the frequency conversion loss and the noise coefficient index can be lower than 30dB.

Description

technical field [0001] The invention belongs to the technical field of mixers, and in particular relates to an ultra-wideband mixer. Background technique [0002] As an important part of systems such as microwave and millimeter wave radar, guidance, communication and test equipment, mixers have always been an important topic in the field of microwave and millimeter wave research. With the continuous improvement of the requirements of various receiving systems on the working bandwidth, test sensitivity and detection distance, the bandwidth, conversion loss and noise figure of the mixer are also put forward higher requirements. [0003] MMIC mixers based on active devices in the prior art, although this type of mixer can achieve frequency coverage from radio frequency to millimeter wave frequency band (about 50 GHz) and has frequency conversion gain, but its inherent defect is its large noise figure . The mixer based on the hybrid integration process of Schottky barrier diod...

AI Technical Summary

Problems solved by technology

[0004] At present, the broadband mixer based on the hybrid integration process of Schottky barrier diodes generally uses local oscillator and RF balun and four diode stacks to realize double-balanced mixing. The advantage of this structure is that the frequency range is only comparable to that of local oscillator and RF. The bandwidth of the RF balun is related, but the disadvantage is that it cannot achieve a larger operating bandwidth, and as the frequency increases to the millimeter wave frequency band, the frequency conversion loss and noise figure indicators deteriorate rapidly

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