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US4873527A Expired / Lapsed US ⏱️ 0.0 years remaining

Antenna system for a wrist carried paging receiver

Assignee: Motorola Solutions Inc
•
Filing: 1988-01-07
•
Granted: 1989-10-10
•
Expires: 2008-01-07
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Abstract

Abstract The antenna system of the present invention includes a single loop antenna connected in series with a ferrite core loop antenna. The single loop antenna is enclosed in a nonconductive housing, such as a band, which surrounds the wrist. The single loop antenna has a first end grounded and is connected in series with a first variable capacitive element for adjusting the resonant frequency of the single loop antenna. The ferrite core loop antenna is connected to a second variable capacitive element for adjusting the resonant frequency of the ferrite core loop antenna. One end of the ferrite core loop antenna is applied as an input to a communication receiver such as a paging receiver. The outstanding feature of the antenna system is that the axis of the single loop antenna is perpendicular to and noncoplanar with the ferrite core loop axis for enhancing the sensitivity and minimizing body effects caused by hand movements.

Inventors

  • 👤 William Tan

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 17:40
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/273; H01Q7/00; H01Q7/06; H01Q7/08

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 103 words
An antenna system for a wrist carried paging receiver comprising: a single magnetic loop antenna having first and second ends, said loop antenna enclosed in a non-conductive housing surrounding the wrist, said single magnetic loop antenna having the first end grounded; a ferrite core loop antenna connected in series to the second end of said magnetic loop antenna, said ferrite core loop antenna having an output applied as an input to a receiving means of the paging receiving selective call signals; and further wherein, an axis of the single magnetic loop antenna is perpendicular to and non-coplanar with the ferrite core loop axis.
Claim 2
Dependent Claim 103 words
An antenna system for a wrist carried paging receiver comprising: a single magnetic loop antenna having first and second ends, said loop antenna enclosed in a non-conductive housing surrounding the wrist, said single magnetic loop antenna having the first end grounded; a ferrite core loop antenna connected in series to the second end of said magnetic loop antenna, said ferrite core loop antenna having an output applied as an input to a receiving means of the paging receiving selective call signals; and further wherein, an axis of the single magnetic loop antenna is perpendicular to and non-coplanar with the ferrite core loop axis.
Claim 3
Dependent Claim 32 words
The antenna system of claim 1, wherein said single magnetic loop antenna is connected in series with a first capacitive element for adjusting the resonant frequency of said single magnetic loop antenna.
Claim 4
Dependent Claim 32 words
The antenna system of claim 1, wherein said ferrite core loop antenna is connected in series to a second capacitive element for adjusting the resonant frequency of the ferrite core loop antenna.
Claim 5
Dependent Claim 27 words
The antenna system of claim 1, wherein the circumference of the loop of the single magnetic loop antenna ranges from approximately 14 cm to approximately 20 cm.
Claim 6
Dependent Claim 31 words
The antenna system of claim 1, wherein the length of the ferrite core loop antenna along the ferrite core loop antenna axis ranges from approximately 1.2 cm to approximately 1.8 cm.
Claim 7
Dependent Claim 32 words
The antenna system of claim 1, wherein said ferrite core loop antenna and said receiving means are enclosed in a housing coupled to said non-conductive housing enclosing said single magnetic loop antenna.
Claim 8
Dependent Claim 21 words
The antenna system of claim 6, wherein said housing enclosing said ferrite core loop antenna and said receiving means is non-conductive.
Claim 9
Dependent Claim 25 words
The antenna system according to claim 4, wherein the circumference of the loop of said single magnetic loop antenna is adjusted to fit the wrist.

References Cited (Backward Citations)

CA676743A Cited
US2255897A Cited
US3683389A Cited
US4155091A Cited
CH655205A5 Cited
EP0100639A2 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-10-09 1993-04-10 1993-10-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-10-09 1997-04-10 1997-10-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-10-09 2001-04-10 2001-10-10 $7700.00 Window Closed / Lapsed

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