Wrist carried wireless instrument

Details Wrist carried wireless instrument Wrist carried wireless instrument

1994-07-15

1996-06-25

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Body-attached or connected

343744, 455344, H01Q 700

Patent

active

055304532

ABSTRACT:
A wrist carried wireless instrument for minimizing the effects of coming in contact with the wrist of the user is provided. A case contains wireless instrument circuitry. A loop antenna extends without the case. An antenna resonance circuit has two capacitors connected in series. The two capacitors are connected to the loop antenna. A connection between two of the capacitors is formed at substantially the half impedance value across the capacitors and is a ground electric potential. An RF amplifier connects the loop antenna to the wireless instrument circuitry.

REFERENCES:
patent: 2184771 (1939-12-01), Roosenstein
patent: 3032651 (1962-05-01), Gisiger-Stahli, et al.
patent: 3725942 (1973-04-01), Ukmar
patent: 4714887 (1987-12-01), Meissner, et al.
patent: 4769656 (1988-09-01), Dickey
patent: 4817196 (1989-03-01), MacNak, et al.
patent: 5072231 (1991-12-01), Koyama
patent: 5225846 (1993-07-01), Koyama
Ito et al, "A Small Loop Antenna for Pocket Size VHG Radio Equipment", Nat'l.-Technical (Report/Japan), vol. 19, Apr. 1973.
K. Fujimoto, A. Henderson, K. Hirasawa and J. R. James, Small Antennas, research Studies Press, 1987, pp. 75-117.

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