This article designs a passive dual balanced broadband mixer operating in the Ka fre-quency band.The mixer is a ring-shaped structure,and the mixing device is composed of four Schottky diodes.The Balun adopts a helical Marchand Balun design,which solves the problem of difficult Balun integration.In order to improve the problem of insufficient port isolation,this paper designs a matching structure,which is a set of high pass filters,the filters are located be-tween the oscillator balun and the diode stack.At the same time,fixed attenuators are added to the local oscillator and RF ports to optimize the port standing wave ratio.
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