SimRF-->Circuit Envelope-->Directional Coupler Model - INCORRECT IMPLEMENTATION
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I am experimenting the "Ideal Couplers - Directional coupler" under the SimRF->Circuit Envelope->Junctions toolbox. The parameters I play with are the Insertion loss and Coupling. I fixed the Coupling to 25dB and the insertion loss cannot go below 0.51dB else an error message pops up saying " Expected passive test for Directional coupler to be nonzero.". That doesn't make sense. (10^(-coupling/20))^2 + (10^(-insertion loss/20))^2 = 1. With 25dB coupling, the insertion loss can go to 0.014dB. I suspect the implementation is wrong. Anyone has any idea?
Thanks, cfy30
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Andreas Loeffler
el 3 de Nov. de 2016
I can confirm that issue. I am using 2016a. I guess one has to construct its own directional coupler with S parameters.
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