Patent US5541609A successfully refreshed from Google Patents.
US5541609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduced operator emission exposure antennas for safer hand-held radios and cellular telephones
Assignee: Virginia Tech Intellectual Properties Inc
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Filing: 1995-03-08
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Granted: 1996-07-30
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Expires: 2015-03-08
Abstract
Abstract An antenna for a personal communication device designed for reducing RF emissions to a user's head and body comprises a single half-wave dipole antenna element mounted on the top of a telescoping rod such that the antenna element is raised above the user's head when the rod is extended. The rod is completely inactive and serves only to elevate the active antenna element above the user's head and away from the body. A built-in switch is provided which reduces the transmission RF power when the rod is retracted to further protect the user. In a second embodiment, a co-linear array of dipole antenna elements is used. The full array is active for reception. However, a proximity detector senses the proximity of a human body, and lowers the RF transmission power to those antenna elements in the array that are closest to the user's head.
Inventors
- 👤 Warren L. Stutzman
- 👤 J. Randall Nealy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:00
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q1/245; H01Q21/00; H01Q21/06; H01Q21/08; H01Q21/10; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/20
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
71 words
An antenna for a personal communication device for reducing RF emissions to a user, comprising: a support rod suitable for mounting to a personal communication device; an antenna element mounted atop said support rod; a lead means for electrically connecting said antenna element to the personal communication device; and transmission power control means for reducing transmission power of the personal communication device when said antenna element is close to a user.
Claim 2
Dependent Claim
71 words
An antenna for a personal communication device for reducing RF emissions to a user, comprising: a support rod suitable for mounting to a personal communication device; an antenna element mounted atop said support rod; a lead means for electrically connecting said antenna element to the personal communication device; and transmission power control means for reducing transmission power of the personal communication device when said antenna element is close to a user.
Claim 3
Dependent Claim
21 words
An antenna for a personal communication device as recited in claim 1 wherein said antenna element is a half-wave dipole antenna.
Claim 4
Dependent Claim
21 words
An antenna for a personal communication device as recited in claim 1, wherein said support rod is a telescoping support rod.
Claim 5
Dependent Claim
36 words
An antenna for a personal communication device as recited in claim 3, further comprising: a switch means, connected to said transmission power control means, for detecting when said telescoping support rod is in a retracted position.
Claim 6
Dependent Claim
20 words
An antenna for a personal communication device as recited in claim 4 wherein said switch means is a variable switch.
Claim 7
Dependent Claim
90 words
An antenna for a personal communication device for reducing RF emissions to a user, comprising: a support rod suitable for mounting to a personal communication device; an antenna element mounted to said telescoping support rod; a lead means for electrically connecting said antenna element to the personal communication device; means for determining proximity between said antenna element and the user; and transmission power control means, connected to said means for determining proximity, for reducing transmission power supplied to said antenna element when said antenna element is close to a user.
Claim 8
Dependent Claim
90 words
An antenna for a personal communication device for reducing RF emissions to a user, comprising: a support rod suitable for mounting to a personal communication device; an antenna element mounted to said telescoping support rod; a lead means for electrically connecting said antenna element to the personal communication device; means for determining proximity between said antenna element and the user; and transmission power control means, connected to said means for determining proximity, for reducing transmission power supplied to said antenna element when said antenna element is close to a user.
Claim 9
Dependent Claim
21 words
An antenna for a personal communication device as recited in claim 6 wherein said antenna element is a half-wave dipole antenna.
Claim 10
Dependent Claim
33 words
An antenna for a personal communication device as recited in claim 6 wherein said antenna element is one of a plurality of discrete dipoles arranged in a co-linear array on said support rod.
Claim 11
Dependent Claim
23 words
An antenna for a personal communication device as recited in claim 6 wherein said means for determining proximity is an electronic proximity detector.
Claim 12
Dependent Claim
20 words
An antenna for a personal communication device as recited in claim 6 wherein said support rod is a flexible rod.
Claim 13
Dependent Claim
21 words
An antenna for a personal communication device as recited in claim 6 wherein said means for determining proximity is a switch.
Claim 14
Dependent Claim
94 words
An antenna for a personal communication device for reducing RF radiation exposure to a user, comprising: an array of dipole antenna elements; means for electrically connecting said array of dipole antenna elements to a personal communication device; transmission power control means for selectively reducing RF transmission power to said array of dipole antenna elements; and means for determining proximity between ones of said array of dipole antenna elements and the user, said transmission power control means reducing RF transmission power to ones of said co-linear array of dipole antenna elements closest to the user.
Claim 15
Dependent Claim
94 words
An antenna for a personal communication device for reducing RF radiation exposure to a user, comprising: an array of dipole antenna elements; means for electrically connecting said array of dipole antenna elements to a personal communication device; transmission power control means for selectively reducing RF transmission power to said array of dipole antenna elements; and means for determining proximity between ones of said array of dipole antenna elements and the user, said transmission power control means reducing RF transmission power to ones of said co-linear array of dipole antenna elements closest to the user.
Claim 16
Dependent Claim
24 words
An antenna for a personal communication device as recited in claim 12 wherein said array of dipole elements are mounted on a flexible rod.
Claim 17
Dependent Claim
28 words
An antenna for a personal communication device as recited in claim 12 wherein said array of dipole elements are mounted within the chassis of said personal communication device.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-30 | 2000-01-29 | 2000-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-30 | 2004-01-29 | 2004-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-30 | 2008-01-29 | 2008-07-30 | $7700.00 | Window Closed / Lapsed |