em wave dissipative medium

Hey everybody,

Please I'm looking for a good absorbant of electromagnetic waves of frequency go up to 100 MHz!

Thanks you

but this is very low frequency, the absorber will have to be very thick. Also you say up to 100MHz, the realization depends also on the lowest frequency.

Do you need a waveguide absorber or a wave absorber ?

I'm in need of an absorber, someone told me to think about ancoidal chamber! what do you think about?