Patent US5677698A successfully refreshed from Google Patents.
US5677698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slot antenna arrangement for portable personal computers
Assignee: Microchip Technology Caldicot Ltd
•
Filing: 1995-08-04
•
Granted: 1997-10-14
•
Expires: 2015-08-04
Abstract
Abstract An antenna arrangement is provided in which a slot antenna is attached to the surface of an equipment case made of a dielectric material, there being provided also a ground plane spaced a small distance apart from the case and behind the antenna. The equipment may be a personal computer, e.g. a notebook computer, and the antenna, which may take the form of a copper foil, may be attached to the lid of the computer by an adhesive on its rear surface. The ground plane may, in this case, take the form of an existing display backplane. The invention provides for the realization of a compact antenna arrangement due to the effect of the case dielectric on the effective electrical length of the slot antenna.
Inventors
- 👤 Robert Alan Snowdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:06
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/2258; H01Q13/00; H01Q13/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
Electrical apparatus incorporating an antenna arrangement, the apparatus comprising: a casing of dielectric material, said casing having an inner face; a substantially planar sheet of electrically conductive material secured to the inner face of said casing, and having formed therein at least two elongate apertures defining respective slot antennas in a diversity configuration, said slot antennas being electrically coupled to the dielectric material of said casing; a substantially planar ground plane means secured in spaced relationship with, and substantially parallel with, said sheet of electrically conductive material; and respective connection means coupled to at least one edge of each said elongate aperture.
Claim 2
Dependent Claim
102 words
Electrical apparatus incorporating an antenna arrangement, the apparatus comprising: a casing of dielectric material, said casing having an inner face; a substantially planar sheet of electrically conductive material secured to the inner face of said casing, and having formed therein at least two elongate apertures defining respective slot antennas in a diversity configuration, said slot antennas being electrically coupled to the dielectric material of said casing; a substantially planar ground plane means secured in spaced relationship with, and substantially parallel with, said sheet of electrically conductive material; and respective connection means coupled to at least one edge of each said elongate aperture.
Claim 3
Dependent Claim
48 words
The electrical apparatus in accordance with claim 1, wherein each said slot antenna is dimensioned for operation at a predetermined center frequency, and said ground plane means is spaced from said sheet of electrically conductive material by approximately one sixtieth of a wavelength at said predetermined center frequency.
Claim 4
Dependent Claim
24 words
The electrical apparatus in accordance with claim 2, wherein each said slot antenna is dimensioned as a half-wave antenna at said predetermined center frequency.
Claim 5
Dependent Claim
58 words
The electrical apparatus in accordance with claim 1, wherein said casing houses a portable computer, wherein said sheet of electrically conductive material is secured to an inner face of a lid portion of the casing, and wherein said ground plane means is formed by a conductive rear face of a display circuit board attached to said lid portion.
Claim 6
Dependent Claim
19 words
The electrical apparatus in accordance with claim 1, wherein said sheet of electrically conductive material comprises a copper foil.
Claim 7
Dependent Claim
29 words
The electrical apparatus in accordance with claim 1, wherein said sheet of electrically conductive material is secured to said inner face of said casing by means of an adhesive.
References Cited (Backward Citations)
US4443802A
Cited
EP0117990A1
Cited
US4694301A
Cited
US4935745A
Cited
US4975711A
Cited
US4980694A
Cited
EP0508567A2
Cited
US5138328A
Cited
US5394160A
Cited
EP0543645A1
Cited
US5467477A
Cited
EP0571124A1
Cited
US5373300A
Cited
US5404583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-10-13 | 2001-04-14 | 2001-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-13 | 2005-04-14 | 2005-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-13 | 2009-04-14 | 2009-10-14 | $7700.00 | Window Closed / Lapsed |