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2 years ago in Corrections , Hindi Literature By Kumar

I’m matching two 4G MIMO antenna elements in Genesys. How can I use the Smith Chart tool to simultaneously optimize S11 and S22 while ensuring S21 (isolation) remains acceptable?

I have the measured S-parameters of my two-element MIMO antenna (1700–2200 MHz) in Genesys. The ports are mismatched and coupled. I need to design a matching network (likely L-section or pi-network) for each port. Can I use the single-port Smith Chart matching wizard independently for each, or do I need to account for mutual coupling in the matching process? If I match Port 1, it changes the impedance seen at Port 2. What's the systematic workflow in Genesys to converge on a matching solution that gives good S11, S22, and maintains low S21 across the band?

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By Keerthi Gupta Answered 1 year ago

In Genesys, you must account for coupling; treating ports independently leads to a sub-optimal solution. Here's my workflow: First, simulate or import the full 2-port S-parameter block of your unmatched antenna. Use the "Matching Network Designer" with this 2-port block as the load. While the tool defaults to a single-port view, you can manually iterate. Design an L-section for Port 1 while observing S11, S22, and S21. Then, design for Port 2 with the first network in place. This is iterative. Better yet, use Genesys's optimization with goals for S11

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