A kind of ultra-wideband mixer

Abstract

The invention provides an ultra-wideband mixer, which includes a broadside coupled balun of a local oscillator channel and a transition section from a broadside coupled strip line to a planar transmission line, a coplanar waveguide of a radio frequency channel, an intermediate frequency output channel, and a pair of mixing diodes; The LO and RF signals are respectively input into the mixing diode through the LO and RF channels for mixing, and the generated IF signal is output through the IF channel; the broadside coupling balun is used to realize the unbalanced to balanced conversion of the ultra-wideband LO signal , and then the balanced local oscillator signal is converted to the planar transmission line through the transition section, and the intermediate frequency signal generated after inputting the mixing diode uses the gold wire inductor to cross the coplanar waveguide and output through the microstrip line. Using the above scheme, the working frequency can cover the ultra-wide frequency range of 0.01GHz-110GHz; in the frequency range of 0.01GHz-70GHz, it works in the way of fundamental wave mixing, which can achieve the frequency conversion loss and noise figure index lower than 12dB; It works in the third harmonic mixing mode in the 110GHz frequency range, and can achieve frequency conversion loss and noise figure indicators 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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