I came across the following circuit on net which is a simple RF/cellphone signal detector:
Before I build and try I decided to simulate it in LTspice as follows:
I'm stuck at point about modelling the loop antenna for the simulation. You can see I put ??? question mark there in above schematics.
What type of source should I place at ??? to mimic the antenna? Should I use a 1GHz sinusoidal voltage signal source or a current signal source at 1GHz for instance? And what would be a realistic amplitude or frequency of the signal for a cell phone nearby like 5 10cm apart from the antenna?
Regarding an answer:
Now what can we say about the model for the antenna coupling?
I used a current source with 1uA amplitude and 1 GHz freq. Coupling done by a transformer above with 1uH inductances and 0.01 coupling factor.
Would this be realistic for a loop antenna for 15 cm diameter 10 cm far away from a typical cell phone?