The use of active antennas in microwave radiometric thermometry is investigated, where prospective applications are within biomedical diagnostics. By incorporating a tiny low-noise amplifier, with only marginal self-heating, in the antenna probe, it is shown that the temperature accuracy of a broadband radiometer can be improved as a consequence of a smaller overall system noise figure. Proof of concept is verified experimentally through increased detectability of a hot object within a lossy medium.
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Jacobsen et al. (2007) studied this question.
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