Mixer and method capable of outputting local oscillation harmonic amplitude through cancellation and suppression

Abstract

The invention relates to a mixer and method capable of outputting local oscillation harmonic amplitude through cancellation and suppression. According to the mixer and method, a 0-degree power dividing bridge is adopted to perform power division on local oscillation signals from an external local oscillator source, so that two paths of equal-amplitude and in-phase local oscillation signals can be formed, and the two paths of local oscillation signals enter two paths of mixers; the two paths of equal-amplitude and in-phase local oscillation fundamental wave and harmonic signals are converted into two paths of equal-amplitude and anti-phase signals through a 180-degree coupling bridge; and cancellation and suppression are performed on the local oscillation fundamental wave and harmonic signals. With the mixer and method of the invention adopted, the problem of difficult local oscillation fundamental wave and harmonic suppression or incapability of realizing local oscillation fundamental wave and harmonic suppression in a frequency conversion process of a satellite-borne receiver can be solved, and design difficulty of radio frequency links of the receiver can be reduced, and the harmonic and clutter suppression performance of the receiver can be improved. The layout design of all circuits is reasonable, so that the mixer can be adopted as frequency conversion mixers of the satellite-borne receiver and emitter. The mixer has high safety and can be well applied to a satellite-borne communication system.

Description

technical field [0001] The invention relates to a mixer and a method for suppressing output local oscillator harmonic amplitude through cancellation, and belongs to the field of microwave technology. Background technique [0002] With the continuous development of communication satellite technology and the continuous increase of satellite communication capacity, the system has higher and higher requirements for the design of satellite-borne microwave receivers, mainly reflected in high integration, small size, and high harmonic clutter Inhibition, etc. At present, in the frequency conversion of microwave receivers in communication satellite payload transponders, the fundamental wave or harmonic of the local oscillator is very close to the frequency of the output intermediate frequency, or directly falls within the working frequency band of the intermediate frequency (such as low local oscillator, high-medium frequency Receiver frequency conversion mode), which makes it extr...

AI Technical Summary

Problems solved by technology

[0007] The technical problem solved by the present invention is: to overcome the deficiencies in the prior art, to provide a mixer and method for suppressing the output local oscillator harmonic amplitude by canceling, by adding a 0° power divider, The 180° coupling bridge and 50Ω matching load can well cancel and suppress the common local oscillator fundamental wave and harmonic signals at the outp

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