Wrist watch type receiver

Details Wrist watch type receiver Wrist watch type receiver

1991-02-19

1992-08-04

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Body-attached or connected

343730, 343895, H01Q 112

Patent

active

051363038

ABSTRACT:
A pair of bands are each secured at one end to one side of a case wherein a radio receiver is housed, and a monopole antenna having a length of 0.005.lambda. has one end connected to the feeding point of the radio receiver and its other end exposed to the outside of the case to form a contact portion for contact with the human body. A first helical antenna is supported to the one of the bands lengthwise thereof and is connected at one end to the feeding point. A second helical antenna is supported to the other band lengthwise thereof and is connected at one end to the common potential point of the radio receiver. The first and second helical antennas resonate, as one antenna, with the wavelength .lambda. used by the radio receiver, and their pitch P and helix area A are selected so that P<500A/.lambda. and P>150A/.lambda.. In an alternative embodiment first and second zigzag antennas are supported on said pair of bands respectively, and similarly connected to said feeding and common potential points instead of said helical antennas.

REFERENCES:
patent: 3032651 (1962-05-01), Gisiger-Stahli
patent: 4754285 (1988-06-01), Robitaille
patent: 5007105 (1991-04-01), Kudoh et al.
"Wrist Strap Type Antenna System" by K. Horie, Patent Abstracts of Japan, vol. 11, No. 4 (E.468)(2451), Jan. 7, 1987.

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