Passive transponder

Details Passive transponder Passive transponder

1987-10-20

1989-12-26

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

Radar transponder only

340505, 34082554, 342 42, G01S 1380

Patent

active

048901113

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.

REFERENCES:
patent: 4084162 (1978-04-01), Dubost et al.
patent: 4331957 (1982-05-01), Enander et al.
patent: 4450431 (1984-05-01), Hochstein
patent: 4656478 (1987-04-01), Levenberger
patent: 4679046 (1987-07-01), Curtis et al.
"Concentrated Directional Antennas for Transmission and Reception: Rotatable Loops and Antenna-Reflector Systems of Reduced Dimensions"; QST Magazine, (10/37; pp. 27-30).
Webster's Ninth New Collegiate Dictionary; (Merriam-Webster, 1984), p. 1256.

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