Program for evaluating microwave transmission through material with permittivity epsilon Excel Program Maple Program Supplementary information Product note A microwave beam at single frequency impinges on a slab of material of specified thickness. The material is situated in a waveguide Cell A3 specifies real epsilon e.g. for PTFE a value of 2.0 may be written Cell E3 specifies imaginary epsilon e.g. value for GLASS –0.01 (include minus sign) Cell F8 gives a scaling factor sf the data Sheet is set up for a sample of thickness 1 cm the sf allows this to be changed e.g. for a sample of 10 cm then sf = 10 Cell A5 is used to specify the frequency of the microwave beam Cell B7 specifies the broad dimension, a, of the waveguide in cm e.g. for X-band a = 2.286, for C-band a = 3.485 if a is given a large value, say, a = 1000 the program is applicable to free space propagation On "DATA SHEET" any of the above cells can be changed PROCEDURE 1. Go to cell 2. Change value 3. Click on green tick CHART 1 gives phase transmission CHART 2 gives relative transmission of the microwave beam

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