US6380895B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trap microstrip PIFA
Assignee: Laird Technologies AB
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Filing: 1998-07-07
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Granted: 2002-04-30
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Expires: 2018-07-07
Abstract
Abstract The present invention relates to a small microstrip antenna device, mountable inside a hand-held radio communication device, for receiving and transmitting RF signals in one or more frequency bands. The microstrip antenna comprises a ground plane means ( 101 ), at least a first feeding means ( 107 ) and N radiating elements where N is an integer greater than zero. The microstrip antenna structure also has a first conductive path ( 104 ). The feeding means is arranged on the first patch for feeding radio frequency signals to the N radiating elements, wherein at least a first of the N radiating elements has a second patch ( 106 ). The second patch is inductively coupled ( 108 ) to the first patch.
Inventors
- 👤 Stefan Moren
- 👤 Corbett Rowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:19
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q1/243; H01Q1/244; H01Q1/36; H01Q5/00; H01Q5/30; H01Q5/307; H01Q5/314; H01Q5/321; H01Q5/342; H01Q5/357; H01Q5/364; H01Q5/371
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
97 words
A microstrip antenna structure for receiving and transmitting radio frequency signals in at least two frequency bands, comprising: a ground plane means, at least a first feeding means and, N radiating elements where N is an integer number greater than zero, said microstrip antenna structure having a first conductive patch, said feeding means being arranged for feeding radio frequency signals to the first patch, at least a first of the N radiating elements having a second patch, inductive means for inductively coupling the second patch to said first patch and, said second patch having a free end.
Claim 2
Dependent Claim
97 words
A microstrip antenna structure for receiving and transmitting radio frequency signals in at least two frequency bands, comprising: a ground plane means, at least a first feeding means and, N radiating elements where N is an integer number greater than zero, said microstrip antenna structure having a first conductive patch, said feeding means being arranged for feeding radio frequency signals to the first patch, at least a first of the N radiating elements having a second patch, inductive means for inductively coupling the second patch to said first patch and, said second patch having a free end.
Claim 3
Dependent Claim
38 words
The structure according to claim 1 wherein, said first and second patch being thin conductive layers on a dielectric carrier, said ground plane means substantially coextending with said N radiating means being arranged in proximity to the patches.
Claim 4
Dependent Claim
15 words
The structure according to claim 1 wherein, said second patch having a substantially rectangular shape.
Claim 5
Dependent Claim
42 words
The structure according to claim 1 wherein, said first and second patch being arranged at a specific distance from each other to attain, in addition to the inductive coupling, a capacitive coupling between the first and second patch with a specific capacitance.
Claim 6
Dependent Claim
30 words
The structure according to claim 1 wherein, first capacitive means being arranged for attaining in addition to the inductive coupling, a capacitive coupling said first patch to the second patch.
Claim 7
Dependent Claim
33 words
The structure according to claim 1 wherein, said inductive means is formed by at least one discrete component held by retainer means for inductively coupling said first and second patches to each other.
Claim 8
Dependent Claim
25 words
The structure according to claim 6 wherein, said retainer means comprise first and second protrusions arranged on a dielectric substrate for retaining the discrete component.
Claim 9
Dependent Claim
19 words
The structure according to claim 1 wherein, N is equal to one and, said first patch being substantially rectangular.
Claim 10
Dependent Claim
25 words
The structure according to claim 1 wherein, at least a second of the N radiating elements is an elongated conductive strip having a free end.
Claim 11
Dependent Claim
59 words
The structure according to claim 1 wherein, N is greater than one, said first conductive patch comprises at least a first protruding part, at least a second radiating element comprises a third substantially rectangular conductive patch, inductive means being arranged for inductively coupling said third patch to the first protruding part and, said third patch having a free end.
Claim 12
Dependent Claim
37 words
The structure according to claim 1 wherein, at least one of the N radiating elements having a capacitive coupling to the ground plane means at the free end, said capacitive coupling being adjusted to a specific capacitance.
Claim 13
Dependent Claim
24 words
The structure according to claim 11 wherein, a conductive extension means extending towards the ground plane means so as to attain the capacitive coupling.
Claim 14
Dependent Claim
19 words
The structure according to claim 11 wherein, said antenna structure further comprising a discrete component achieving the capacitive coupling.
Claim 15
Dependent Claim
15 words
The structure according to claim 1 wherein, said inductive means is a meandering conductive strip.
Claim 16
Dependent Claim
13 words
The structure according to claim 1 wherein, said inductive means is a coil.
Claim 17
Dependent Claim
15 words
The structure according to claim 1 wherein, said inductive means is a tunable, active inductor.
Claim 18
Dependent Claim
18 words
The structure according to claim 1 wherein, said N radiating elements being arranged substantially parallel to each other.
Claim 19
Dependent Claim
33 words
The structure according to claim 1 wherein, N being three, said first patch having three protruding parts essentially forming a Y-shape and, first, second and third radiating elements extending from said protruding parts.
Claim 20
Dependent Claim
33 words
The structure according to claim 1 wherein, N being three, said first patch having three protruding parts essentially forming a T-shape and, first, second and third radiating elements extending from said protruding parts.
Claim 21
Dependent Claim
36 words
The structure according to claim 1 wherein, N being three, first and second radiating elements extending essentially parallel in a first direction and, a third radiating element extending in an opposite direction to the first direction.
Claim 22
Dependent Claim
35 words
The structure according to claim 1 wherein, N being four, said first patch having four protruding parts essentially forming a cross shape and, first, second, third and fourth radiating elements extending from the protruding parts.
Claim 23
Dependent Claim
34 words
The structure according to claim 1 wherein, N being four, said first patch having four protruding parts essentially forming a H-shape and, first, second, third and fourth radiating elements extending from said protruding parts.
Claim 24
Dependent Claim
18 words
The structure according to claim 1 wherein, coupling means being arranged for coupling the first patch to ground.
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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) | 2005-04-29 | 2005-10-29 | 2006-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-04-29 | 2009-10-29 | 2010-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-04-29 | 2013-10-29 | 2014-04-30 | $7700.00 | Window Closed / Lapsed |