SimRF-->Circuit Envelope-->Directional Coupler Model - INCORRECT IMPLEMENTATION

2016 8 29
2 个回答
更新时间：2018 7 3
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1 个投票

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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回答（2 个）

Andreas Loeffler
Andreas Loeffler 2016-11-3

0 个投票

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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