Stepped Broadside Directional Coupler

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ge

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I need to do a 6-18GHz directional coupler and decided to do a broadside coupler. Eagleware tells me that I have ~2.5dB of ripple with a single stage 1/4wave coupler and therefore need to do a 2-stage. Does someone have an example of doing a 2-stage broadside directional coupler?

Thanks

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