Larry_80
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From your schematic, your circuit is terminated in 50 ohms load, so assuming you are using ideal switches, your s11 should be a large negative value in dB i.e perfectly or near perfect match. The only thing i can think of is maybe you are doing the measurement when the switch is off (OPEN CIRCUIT), thus u are observing a 0dB S11 value! I am not too sure, but this is what i think might be wrong!
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