A mixer with high-order harmonic suppression capability and its suppression method

Abstract

The invention relates to a frequency mixer with high-order harmonic wave inhibiting ability and an inhibiting method for high-order harmonic waves, and belongs to the technical field of microwaves. The frequency mixer comprises a power division network, two local oscillator harmonic wave inhibiting networks, two field effect tubes and a 3db coupling bridge, local oscillator signals firstly pass through the power division network, then are fed into the field effect tubes, radio frequency signals pass through the 3db coupling bridge, then are fed into the field effect tubes, the radio frequency signals and the local oscillator signals are subjected to frequency mixing in the field effect tubes, the local oscillator harmonic wave inhibiting networks inhibit the local oscillator harmonic wave signals generated by nonlinear effect of the field effect tubes, obtained signals are subjected to power synthesis through the 3db coupling bridge, and finally intermediate-frequency signals are output. By the frequency mixer with high-order harmonic wave inhibiting ability and the inhibiting method for the high-order harmonic waves, LO (local oscillator) harmonic wave inhibiting ability can be substantially improved without influences on frequency mixing performance of the frequency mixer, and the inhibiting method for the high-order harmonic waves is especially suitable for circumstances that LO harmonic waves fall into an IF (intermediate frequency) band.

Description

technical field [0001] The invention relates to a mixer with high-order harmonic suppression capability and a suppression method thereof, belonging to the field of microwave technology. Background technique [0002] A mixer is a commonly used microwave device, and various types have been developed. From the perspective of circuit topology, it includes single-terminal, single-balanced, double-balanced and other forms; the mixing devices used include diodes, FETs (field effect transistors), etc.; from active and passive, including passive mixers and active mixers Source mixers, in terms of technology, include mixers based on MIC or LTCC technology, chip mixers based on MMIC technology, etc. However, the general form of mixer has certain defects in LO (local oscillator) harmonic suppression, and it is difficult to obtain the suppression characteristics of large-scale high-order harmonics. [0003] figure 1 Design results for a single balanced mixer. The LO signal input is 1...

AI Technical Summary

Problems solved by technology

In order to achieve sufficient suppression of LO harmonics to ensure small in-band clutter, the design of the receiver is more complicated

In the world, it is generally realized by two frequency conversions, the whole machine chain is complicated, the power consumption is large, and the failure rate is high

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