CST MWS TD monitoring in time， problem

Hi guys, Happy new Year, been a while how are you? I've been having trouble with something and was hoping you could resolve my problem.
I'm simulating a patch antenna with a superstrate and above it a human tissue phantom sample. It resonates fine at the desired frequency and the superstrate is there for matching purposes (match the substrate to the human tissue for improved radiation penetration). Now i want to monitor the electric field in time so I can then change problem type to thermal and solve the bioheat equation. I thus set an electric field 3D monitor and checked "time", setting "start" to 0 "width" to 1 and "end" to 50 sec. The problem is that when finished it gave me a zero electric field everywhere (notice that when i had first set the monitor to "frequency"=2.45GHz it seemed fine, penetrating sufficiently), the most likeable cause is that it didn't save the E-field distribution in the time range I thought I had set. And I'm pretty sure about this because it displays "Sample 1/1".
What gives? Have i set the monitor in a wrong way? Thanks a lot in advance.

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