Passive transponder.

摘要

The aerial elements (1, 2) of the transponder are pierced with apertures (6, 7) and therefore have the general shape of loops surrounding spaces lacking any metallic element. This arrangement reduces the capacitance of the stray capacitor formed between the aerial elements (1, 2) and the body of the person carrying the transponder. This improves the efficiency of the transponder. Application especially to searches for victims of avalanches. <IMAGE>