When I used tiny (1:10 scale) dimensions of the microwave cavity I can obtain higher S11data (ca. 50dB), and when I put the real dimension these s11 data gets smaller (ca. 1E-4dB). Why it happens? Some clues?
Assuming you are using the same frequency for both cases then what you are saying is, when your cavity dimensions are smaller your S11 parameter is higher (your wave guide does not radiate efficiently). And when your cavity dimensions are larger your S11 parameter is smaller (your wave guide radiates more efficiently). And you have a heating cavity in which you want the power to go into heat. Is this correct?
Hi Nathan, well finally I obtained the S11 data for the real dimensions and the problem was the resolution of frequency. We use the microwave cavity for heating any kind of solid powders (i.e. zeolites) and of course we would like to deliver all the power to the sample but it looks like the cavity (when it is empty) itself absorbs the microwaves regarding the S11 data.
Hi Nigar,
The metal walls of microwave cavity is not idel loss-less metal, so it certainly absorbs microwave energies. However, you can't evaluate the absorbed energy of the empty microwave cavity or the loaded cavity only by the value of the S11's magnitude. You should extract the Quality Factors from the S11 data, and use the Q-values to calcualte the energies absorbed by thy cavity itself and the object in the cavity, respectively.
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