Passive transponder
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United States of America Patent
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-
Dec 26, 1989
Grant Date -
N/A
app pub date -
Oct 20, 1987
filing date -
Oct 22, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The antenna elements of the transponder of this invention are pierced with openings and thus have a general form of loops surrounding spaces devoid of any metallic elements. This arrangement diminishes the capacitance of the stray capacitor formed by the antenna elements and the body of the person carrying the transponder, thus improving the gain thereof. The invention is particularly applicable in the search for avalanche victims.
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