Transponder for use in locating avalanche victims

Details Transponder for use in locating avalanche victims Transponder for use in locating avalanche victims

1980-04-18

1982-05-25

Tubbesing, T.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 5HM, 343 5NA, G01S 1380

Patent

active

043319572

ABSTRACT:
A transponder adapted to be carried on the body of a person for use in locating avalanche victims is designed for cooperation with a search-transmitter and includes a receiver having a passive non-linear element which, by distortion, produces a higher harmonic from the fundamental frequency received from the search-transmitter and includes metal parts which are connected to the non-linear element and function as a receiver/transmitter antenna tuned to the frequency employed, whereby the side of the transponder facing the human body is covered with a dielectric layer the thickness of which is adjusted in accordance with a transmitted frequency of 1000 MHz and in accordance with the dielectric constant of the layer, and whereby the size of the antenna is adjusted in accordance with the dielectric constant.

REFERENCES:
patent: 3745569 (1973-07-01), Works et al.

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