Up- conversion vs Down-Conversion Diode Mixer Design

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svia

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I have basic doubts about how to design a up conversion diode mixer. Which are the difference with designing a downconverter?
In a case of a single balanced mixer, using a 3 dB coupler, design could be depicted as (Hybrid, diodes, IF Filter):


While designing an up converter:

What should be taken into account in design?
Which are the differences?
Is the design something like this?




Thanks for the help
 

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There isn't any principal difference between upconverter and downconverter mixers but input and output hybrids would be optimized for the frequency assigned as RF or LO or IF outputs/inputs.
The core is almost same..
 

The upconvert and the down convert are not the same, just be careful about the hybrid wavelength difference, that's about 180 deg difference.
 

I'm using a 180 º hybrid for downconversion. For up-conversion, is it possible to use the same hybrid? Or which parameters I should optimize for up conversion?

Thanks!
 

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