Transmission coefficient, quantum tunnelling

Huor Earfalas
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I have been trying to calculate the transmission coefficient for a quantum tunelling case, but I seem to get the coefficient value more than 1. How is that possible?

The equation i used is based on the wikipedia page (I am unable to link because I am underpost).

Also typically what are the values for transmission probability?
 
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You might have calculated the reciprocal of the transmission coefficient by accident, or just made a miscalculation. Are you trying to calculate it for a square barrier or a general barrier?
 
Finite square well?
 
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