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Abrupt phase and amplitude change is GaAs Willkinson divider layout momentum simulati

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Jademobile

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Dear,

I need to design a GaAs Willkinson divider. I found the phase and amplitude abrupt change in 2GHz or so. The layout is simulated by ADS momentum.
Is it produced by the ring resonation of Willkinson divider structure?
Are there anybody else encounters this problem?
How to avoid the unwanted abrupt change?

Jade
 

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