Abstract.
In the article the analysis and assessment were done
for using the focused antennas-applicators in diagnostic
equipment of radio thermometry. The properties of focused antennas in
dissipative medium were described. The most important properties for typical
biological mediums are: the absence of expressed effective focusing in transverse direction, existence of optimal aperture size
the (order of values is more than several wave-lengths in medium), which
provides maximum gain, reducing of focused effect as far as decreasing the
focused distance. Approximate model was used for quantitative analysis.
Correctness of approximate model at distances more than half boundary of
near-field region was showed by electrodynamics simulating. We carried out model-based analysis of directional
radiation of focused antennas which were placed on the plane or spherical
boundary of air-medium. Also we performed the analysis of focusing effect for
electrical type radiators (dipoles) and magnetic type radiators (slot
radiators). The work shows that using magnetic type radiators is more effective
than electrical type radiators for distance from aperture less 1,5…2
wave-lengths in medium. It was showed that focused antennas allow to obtain the
greater values of a gain at distances from antenna more than wave-lengths in medium.
We considered the focused antennas which placed on the spherical boundary of
air-medium.
Key words:
focused
antennas, radio thermometry, electric type radiators, magnetic
type radiators, efficiency of focusing.
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