PML boundary on a Cone-ended Coaxial
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Hello I need the reflection coefficient of a Cone-ended Coaxial probe (see the figure please) when there is perfect matching at the end. The flat end of coaxial cable is the port and I want to put a PML radiation on the other end. But the problem is the PML radiation is not simulated properly as the S11 is much lower (around -40 dB) when I use radiation boundary rather then when I use PML radiation.
Can any one help how should I define the PML radiation boundary? I just draw a bigger Cone (with bigger radius) and define it as PML boundary.
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